Adding upstream version 2.4.1.upstream/2.4.1 upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-13 12:15:43 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-13 12:15:43 +0000
commit: f5f56e1a1c4d9e9496fcb9d81131066a964ccd23 (patch)
tree: 49e44c6f87febed37efb953ab5485aa49f6481a7 /src/hooks/dhcp/pgsql_cb
parent: Initial commit. (diff)
download: isc-kea-upstream.tar.xz
isc-kea-upstream.zip
28 files changed, 21931 insertions, 0 deletions
diff --git a/src/hooks/dhcp/pgsql_cb/Makefile.am b/src/hooks/dhcp/pgsql_cb/Makefile.am
new file mode 100644
index 0000000..2bb8eae
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/Makefile.am
@@ -0,0 +1,92 @@
+SUBDIRS = . tests libloadtests
+
+AM_CPPFLAGS  = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES) $(PGSQL_CPPFLAGS)
+AM_CXXFLAGS  = $(KEA_CXXFLAGS)
+
+# Ensure that the message file is included in the distribution
+EXTRA_DIST = pgsql_cb_messages.mes
+
+CLEANFILES = *.gcno *.gcda
+
+# convenience archive
+
+noinst_LTLIBRARIES = libpgsqlcb.la
+ 	
+libpgsqlcb_la_SOURCES  = pgsql_cb_callouts.cc
+
+# Commented out for now - see kea#95
+libpgsqlcb_la_SOURCES += pgsql_cb_dhcp4.cc pgsql_cb_dhcp4.h
+
+# Commented out for now - to be added back in #96
+libpgsqlcb_la_SOURCES += pgsql_cb_dhcp6.cc pgsql_cb_dhcp6.h
+
+libpgsqlcb_la_SOURCES += pgsql_cb_impl.cc pgsql_cb_impl.h
+libpgsqlcb_la_SOURCES += pgsql_cb_messages.cc pgsql_cb_messages.h
+libpgsqlcb_la_SOURCES += pgsql_cb_log.cc pgsql_cb_log.h
+libpgsqlcb_la_SOURCES += pgsql_query_macros_dhcp.h
+libpgsqlcb_la_SOURCES += version.cc
+
+libpgsqlcb_la_CXXFLAGS = $(AM_CXXFLAGS)
+libpgsqlcb_la_CPPFLAGS = $(AM_CPPFLAGS)
+
+# install the shared object into $(libdir)/kea/hooks
+lib_hooksdir = $(libdir)/kea/hooks
+lib_hooks_LTLIBRARIES = libdhcp_pgsql_cb.la
+
+libdhcp_pgsql_cb_la_SOURCES  =
+libdhcp_pgsql_cb_la_LDFLAGS  = $(AM_LDFLAGS) $(pgsql_LIBS)
+libdhcp_pgsql_cb_la_LDFLAGS  += -avoid-version -export-dynamic -module
+
+libdhcp_pgsql_cb_la_LIBADD  = libpgsqlcb.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/dhcpsrv/libkea-dhcpsrv.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/process/libkea-process.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/eval/libkea-eval.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/dhcp_ddns/libkea-dhcp_ddns.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/stats/libkea-stats.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/config/libkea-cfgclient.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/http/libkea-http.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/pgsql/libkea-pgsql.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/database/libkea-database.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/log/libkea-log.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/util/libkea-util.la
+libdhcp_pgsql_cb_la_LIBADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+
+# If we want to get rid of all generated messages files, we need to use
+# make maintainer-clean. The proper way to introduce custom commands for
+# that operation is to define maintainer-clean-local target. However,
+# make maintainer-clean also removes Makefile, so running configure script
+# is required.  To make it easy to rebuild messages without going through
+# reconfigure, a new target messages-clean has been added.
+maintainer-clean-local:
+	rm -f pgsql_cb_messages.h pgsql_cb_messages.cc
+
+# To regenerate messages files, one can do:
+#
+# make messages-clean
+# make messages
+#
+# This is needed only when a .mes file is modified.
+messages-clean: maintainer-clean-local
+
+if GENERATE_MESSAGES
+
+# Define rule to build logging source files from message file
+messages: pgsql_cb_messages.h pgsql_cb_messages.cc
+	@echo Message files regenerated
+
+pgsql_cb_messages.h pgsql_cb_messages.cc: pgsql_cb_messages.mes
+	$(top_builddir)/src/lib/log/compiler/kea-msg-compiler $(top_srcdir)/src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.mes
+
+else
+
+messages pgsql_cb_messages.h pgsql_cb_messages.cc:
+	@echo Messages generation disabled. Configure with --enable-generate-messages to enable it.
+
+endif
diff --git a/src/hooks/dhcp/pgsql_cb/Makefile.in b/src/hooks/dhcp/pgsql_cb/Makefile.in
new file mode 100644
index 0000000..50c0c9d
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/Makefile.in
@@ -0,0 +1,1089 @@
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+# Ensure that the message file is included in the distribution
+EXTRA_DIST = pgsql_cb_messages.mes
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+
+# convenience archive
+noinst_LTLIBRARIES = libpgsqlcb.la
+
+# Commented out for now - see kea#95
+
+# Commented out for now - to be added back in #96
+libpgsqlcb_la_SOURCES = pgsql_cb_callouts.cc pgsql_cb_dhcp4.cc \
+	pgsql_cb_dhcp4.h pgsql_cb_dhcp6.cc pgsql_cb_dhcp6.h \
+	pgsql_cb_impl.cc pgsql_cb_impl.h pgsql_cb_messages.cc \
+	pgsql_cb_messages.h pgsql_cb_log.cc pgsql_cb_log.h \
+	pgsql_query_macros_dhcp.h version.cc
+libpgsqlcb_la_CXXFLAGS = $(AM_CXXFLAGS)
+libpgsqlcb_la_CPPFLAGS = $(AM_CPPFLAGS)
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+	$(top_builddir)/src/lib/eval/libkea-eval.la \
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+	$(top_builddir)/src/lib/stats/libkea-stats.la \
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+	$(top_builddir)/src/lib/http/libkea-http.la \
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+	$(top_builddir)/src/lib/hooks/libkea-hooks.la \
+	$(top_builddir)/src/lib/pgsql/libkea-pgsql.la \
+	$(top_builddir)/src/lib/database/libkea-database.la \
+	$(top_builddir)/src/lib/cc/libkea-cc.la \
+	$(top_builddir)/src/lib/asiolink/libkea-asiolink.la \
+	$(top_builddir)/src/lib/dns/libkea-dns++.la \
+	$(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la \
+	$(top_builddir)/src/lib/log/libkea-log.la \
+	$(top_builddir)/src/lib/util/libkea-util.la \
+	$(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+all: all-recursive
+
+.SUFFIXES:
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+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/hooks/dhcp/pgsql_cb/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/hooks/dhcp/pgsql_cb/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
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+	list2=; for p in $$list; do \
+	  if test -f $$p; then \
+	    list2="$$list2 $$p"; \
+	  else :; fi; \
+	done; \
+	test -z "$$list2" || { \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(lib_hooksdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(lib_hooksdir)" || exit 1; \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 '$(DESTDIR)$(lib_hooksdir)'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 "$(DESTDIR)$(lib_hooksdir)"; \
+	}
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+uninstall-lib_hooksLTLIBRARIES:
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+	  $(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(lib_hooksdir)/$$f'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(lib_hooksdir)/$$f"; \
+	done
+
+clean-lib_hooksLTLIBRARIES:
+	-test -z "$(lib_hooks_LTLIBRARIES)" || rm -f $(lib_hooks_LTLIBRARIES)
+	@list='$(lib_hooks_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+clean-noinstLTLIBRARIES:
+	-test -z "$(noinst_LTLIBRARIES)" || rm -f $(noinst_LTLIBRARIES)
+	@list='$(noinst_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
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+libdhcp_pgsql_cb.la: $(libdhcp_pgsql_cb_la_OBJECTS) $(libdhcp_pgsql_cb_la_DEPENDENCIES) $(EXTRA_libdhcp_pgsql_cb_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(libdhcp_pgsql_cb_la_LINK) -rpath $(lib_hooksdir) $(libdhcp_pgsql_cb_la_OBJECTS) $(libdhcp_pgsql_cb_la_LIBADD) $(LIBS)
+
+libpgsqlcb.la: $(libpgsqlcb_la_OBJECTS) $(libpgsqlcb_la_DEPENDENCIES) $(EXTRA_libpgsqlcb_la_DEPENDENCIES) 
+	$(AM_V_CXXLD)$(libpgsqlcb_la_LINK)  $(libpgsqlcb_la_OBJECTS) $(libpgsqlcb_la_LIBADD) $(LIBS)
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+mostlyclean-compile:
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+distclean-compile:
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new file mode 100644
index 0000000..1d6f178
--- /dev/null
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+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+check-TESTS: $(TESTS)
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+	srcdir=$(srcdir); export srcdir; \
+	list=' $(TESTS) '; \
+	$(am__tty_colors); \
+	if test -n "$$list"; then \
+	  for tst in $$list; do \
+	    if test -f ./$$tst; then dir=./; \
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+		col=$$grn; res=PASS; \
+	      ;; \
+	      esac; \
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+	      *[\ \	]$$tst[\ \	]*) \
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+	  if test "$$skip" -ne 0; then \
+	    if test "$$skip" -eq 1; then \
+	      skipped="($$skip test was not run)"; \
+	    else \
+	      skipped="($$skip tests were not run)"; \
+	    fi; \
+	    test `echo "$$skipped" | wc -c` -le `echo "$$banner" | wc -c` || \
+	      dashes="$$skipped"; \
+	  fi; \
+	  report=""; \
+	  if test "$$failed" -ne 0 && test -n "$(PACKAGE_BUGREPORT)"; then \
+	    report="Please report to $(PACKAGE_BUGREPORT)"; \
+	    test `echo "$$report" | wc -c` -le `echo "$$banner" | wc -c` || \
+	      dashes="$$report"; \
+	  fi; \
+	  dashes=`echo "$$dashes" | sed s/./=/g`; \
+	  if test "$$failed" -eq 0; then \
+	    col="$$grn"; \
+	  else \
+	    col="$$red"; \
+	  fi; \
+	  echo "$${col}$$dashes$${std}"; \
+	  echo "$${col}$$banner$${std}"; \
+	  test -z "$$skipped" || echo "$${col}$$skipped$${std}"; \
+	  test -z "$$report" || echo "$${col}$$report$${std}"; \
+	  echo "$${col}$$dashes$${std}"; \
+	  test "$$failed" -eq 0; \
+	else :; fi
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
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+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
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+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
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+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
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+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
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+check: check-recursive
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/hook_load_unittests-load_unload_unittests.Po
+	-rm -f ./$(DEPDIR)/hook_load_unittests-run_unittests.Po
+	-rm -f Makefile
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+	distclean-tags
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+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/hooks/dhcp/pgsql_cb/libloadtests/load_unload_unittests.cc b/src/hooks/dhcp/pgsql_cb/libloadtests/load_unload_unittests.cc
new file mode 100644
index 0000000..2791c3d
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/libloadtests/load_unload_unittests.cc
@@ -0,0 +1,64 @@
+// Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/// @file This file contains tests which exercise the load and unload
+/// functions in the ddns tuning hook library. In order to test the load
+/// function, one must be able to pass it hook library parameters. The
+/// the only way to populate these parameters is by actually loading the
+/// library via HooksManager::loadLibraries().
+
+#include <config.h>
+
+#include <cc/data.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <hooks/hooks_manager.h>
+#include <process/daemon.h>
+#include <testutils/gtest_utils.h>
+#include <testutils/lib_load_test_fixture.h>
+
+#include <gtest/gtest.h>
+#include <errno.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::hooks;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::process;
+
+namespace {
+
+/// @brief Test fixture for testing loading and unloading the PgSQL cb library
+class PgSqlCbLibLoadTest : public isc::test::LibLoadTest {
+public:
+    /// @brief Constructor
+    PgSqlCbLibLoadTest() : LibLoadTest(LIBDHCP_PGSQL_CB_SO) {
+    }
+
+    /// @brief Destructor
+    virtual ~PgSqlCbLibLoadTest() {
+        unloadLibraries();
+    }
+};
+
+// Simple V4 test that checks the library can be loaded and unloaded several times.
+TEST_F(PgSqlCbLibLoadTest, validLoad4) {
+    validDaemonTest("kea-dhcp4");
+}
+
+// Simple V6 test that checks the library can be loaded and unloaded several times.
+TEST_F(PgSqlCbLibLoadTest, validLoad6) {
+    validDaemonTest("kea-dhcp6", AF_INET6);
+}
+
+// Simple V6 test that checks the library cannot by loaded by invalid daemons.
+TEST_F(PgSqlCbLibLoadTest, invalidDaemonLoad) {
+    invalidDaemonTest("kea-ctrl-agent");
+    invalidDaemonTest("kea-dhcp-ddns");
+    invalidDaemonTest("bogus");
+}
+
+} // end of anonymous namespace
diff --git a/src/hooks/dhcp/pgsql_cb/libloadtests/run_unittests.cc b/src/hooks/dhcp/pgsql_cb/libloadtests/run_unittests.cc
new file mode 100644
index 0000000..d9e195d
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/libloadtests/run_unittests.cc
@@ -0,0 +1,20 @@
+// Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the End User License
+// Agreement. See COPYING file in the premium/ directory.
+
+#include <config.h>
+
+#include <log/logger_support.h>
+
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+    isc::log::initLogger();
+
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_callouts.cc b/src/hooks/dhcp/pgsql_cb/pgsql_cb_callouts.cc
new file mode 100644
index 0000000..06727e1
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_callouts.cc
@@ -0,0 +1,122 @@
+// Copyright (C) 2021-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// Functions accessed by the hooks framework use C linkage to avoid the name
+// mangling that accompanies use of the C++ compiler as well as to avoid
+// issues related to namespaces.
+
+#include <config.h>
+
+#include <dhcpsrv/cfgmgr.h>
+#include <hooks/hooks.h>
+#include <process/daemon.h>
+#include <pgsql_cb_impl.h>
+
+#include <pgsql_cb_dhcp4.h>
+#include <pgsql_cb_dhcp6.h>
+#include <pgsql_cb_log.h>
+
+#include <sstream>
+#include <string>
+
+using namespace isc::cb;
+using namespace isc::dhcp;
+using namespace isc::hooks;
+using namespace isc::log;
+using namespace isc::process;
+using namespace std;
+
+extern "C" {
+
+/// @brief This function is called when the library is loaded.
+///
+/// @param handle library handle
+/// @return 0 when initialization is successful, 1 otherwise
+
+int load(LibraryHandle& /* handle */) {
+    // Make the hook library not loadable by d2 or ca.
+    uint16_t family = CfgMgr::instance().getFamily();
+    const std::string& proc_name = Daemon::getProcName();
+    if (family == AF_INET) {
+        if (proc_name != "kea-dhcp4") {
+            isc_throw(isc::Unexpected, "Bad process name: " << proc_name
+                      << ", expected kea-dhcp4");
+        }
+    } else {
+        if (proc_name != "kea-dhcp6") {
+            isc_throw(isc::Unexpected, "Bad process name: " << proc_name
+                      << ", expected kea-dhcp6");
+        }
+    }
+
+    LOG_INFO(pgsql_cb_logger, PGSQL_CB_INIT_OK);
+    // Register PostgreSQL CB factories with CB Managers
+    isc::dhcp::PgSqlConfigBackendDHCPv4::registerBackendType();
+    isc::dhcp::PgSqlConfigBackendDHCPv6::registerBackendType();
+
+    return (0);
+}
+
+/// @brief This function is called by the DHCPv4 server when it is configured.
+///
+/// The only purpose of this callout is to retrieve io_service_ reference.
+///
+/// @param handle callout handle passed to the callout.
+/// @return 0 on success, 1 otherwise.
+int dhcp4_srv_configured(CalloutHandle& handle) {
+    isc::asiolink::IOServicePtr io_service;
+    handle.getArgument("io_context", io_service);
+    if (!io_service) {
+        const string error("Error: io_context is null");
+        handle.setArgument("error", error);
+        handle.setStatus(isc::hooks::CalloutHandle::NEXT_STEP_DROP);
+        return (1);
+    }
+    isc::dhcp::PgSqlConfigBackendImpl::setIOService(io_service);
+    return (0);
+}
+
+/// @brief This function is called by the DHCPv6 server when it is configured.
+///
+/// The only purpose of this callout is to retrieve io_service_ reference.
+///
+/// @param handle callout handle passed to the callout.
+/// @return 0 on success, 1 otherwise.
+int dhcp6_srv_configured(CalloutHandle& handle) {
+    isc::asiolink::IOServicePtr io_service;
+    handle.getArgument("io_context", io_service);
+    if (!io_service) {
+        const string error("Error: io_context is null");
+        handle.setArgument("error", error);
+        handle.setStatus(isc::hooks::CalloutHandle::NEXT_STEP_DROP);
+        return (1);
+    }
+    isc::dhcp::PgSqlConfigBackendImpl::setIOService(io_service);
+    return (0);
+}
+
+/// @brief This function is called when the library is unloaded.
+///
+/// @return 0 if deregistration was successful, 1 otherwise
+int unload() {
+    LOG_INFO(pgsql_cb_logger, PGSQL_CB_DEINIT_OK);
+    // Unregister the factories and remove PostgreSQL backends
+    isc::dhcp::PgSqlConfigBackendDHCPv4::unregisterBackendType();
+    isc::dhcp::PgSqlConfigBackendDHCPv6::unregisterBackendType();
+    return (0);
+}
+
+/// @brief This function is called to retrieve the multi-threading compatibility.
+///
+/// @note: the compatibility is based on the assumption this hook library
+/// is always called from the main thread.
+///
+/// @return 1 which means compatible with multi-threading.
+int multi_threading_compatible() {
+    return (1);
+}
+
+} // end extern "C"
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp4.cc b/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp4.cc
new file mode 100644
index 0000000..9dcac75
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp4.cc
@@ -0,0 +1,5238 @@
+// Copyright (C) 2021-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <pgsql_cb_dhcp4.h>
+#include <pgsql_cb_impl.h>
+#include <pgsql_query_macros_dhcp.h>
+#include <cc/data.h>
+#include <config_backend/constants.h>
+#include <database/database_connection.h>
+#include <database/db_exceptions.h>
+#include <dhcp/classify.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/libdhcp++.h>
+#include <dhcp/option_data_types.h>
+#include <dhcp/option_space.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <dhcpsrv/config_backend_dhcp4_mgr.h>
+#include <dhcpsrv/network.h>
+#include <dhcpsrv/pool.h>
+#include <dhcpsrv/lease.h>
+#include <dhcpsrv/timer_mgr.h>
+#include <dhcpsrv/parsers/client_class_def_parser.h>
+#include <util/buffer.h>
+#include <util/boost_time_utils.h>
+#include <util/multi_threading_mgr.h>
+#include <pgsql/pgsql_connection.h>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/lexical_cast.hpp>
+#include <boost/pointer_cast.hpp>
+#include <boost/scoped_ptr.hpp>
+
+using namespace isc::cb;
+using namespace isc::db;
+using namespace isc::data;
+using namespace isc::asiolink;
+using namespace isc::log;
+using namespace isc::util;
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Implementation of the PostgreSQL Configuration Backend.
+class PgSqlConfigBackendDHCPv4Impl : public PgSqlConfigBackendImpl {
+public:
+
+    /// @brief Statement tags.
+    ///
+    /// The contents of the enum are indexes into the list of SQL statements.
+    /// It is assumed that the order is such that the indices of statements
+    /// reading the database are less than those of statements modifying the
+    /// database.
+    enum StatementIndex {
+        CREATE_AUDIT_REVISION,
+        CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+        GET_GLOBAL_PARAMETER4,
+        GET_ALL_GLOBAL_PARAMETERS4,
+        GET_MODIFIED_GLOBAL_PARAMETERS4,
+        GET_SUBNET4_ID_NO_TAG,
+        GET_SUBNET4_ID_ANY,
+        GET_SUBNET4_ID_UNASSIGNED,
+        GET_SUBNET4_PREFIX_NO_TAG,
+        GET_SUBNET4_PREFIX_ANY,
+        GET_SUBNET4_PREFIX_UNASSIGNED,
+        GET_ALL_SUBNETS4,
+        GET_ALL_SUBNETS4_UNASSIGNED,
+        GET_MODIFIED_SUBNETS4,
+        GET_MODIFIED_SUBNETS4_UNASSIGNED,
+        GET_SHARED_NETWORK_SUBNETS4,
+        GET_POOL4_RANGE,
+        GET_POOL4_RANGE_ANY,
+        GET_SHARED_NETWORK4_NAME_NO_TAG,
+        GET_SHARED_NETWORK4_NAME_ANY,
+        GET_SHARED_NETWORK4_NAME_UNASSIGNED,
+        GET_ALL_SHARED_NETWORKS4,
+        GET_ALL_SHARED_NETWORKS4_UNASSIGNED,
+        GET_MODIFIED_SHARED_NETWORKS4,
+        GET_MODIFIED_SHARED_NETWORKS4_UNASSIGNED,
+        GET_OPTION_DEF4_CODE_SPACE,
+        GET_ALL_OPTION_DEFS4,
+        GET_MODIFIED_OPTION_DEFS4,
+        GET_OPTION4_CODE_SPACE,
+        GET_ALL_OPTIONS4,
+        GET_MODIFIED_OPTIONS4,
+        GET_OPTION4_SUBNET_ID_CODE_SPACE,
+        GET_OPTION4_POOL_ID_CODE_SPACE,
+        GET_OPTION4_SHARED_NETWORK_CODE_SPACE,
+        GET_CLIENT_CLASS4_NAME,
+        GET_ALL_CLIENT_CLASSES4,
+        GET_ALL_CLIENT_CLASSES4_UNASSIGNED,
+        GET_MODIFIED_CLIENT_CLASSES4,
+        GET_MODIFIED_CLIENT_CLASSES4_UNASSIGNED,
+        GET_AUDIT_ENTRIES4_TIME,
+        GET_SERVER4,
+        GET_ALL_SERVERS4,
+        INSERT_GLOBAL_PARAMETER4,
+        INSERT_GLOBAL_PARAMETER4_SERVER,
+        INSERT_SUBNET4,
+        INSERT_SUBNET4_SERVER,
+        INSERT_POOL4,
+        INSERT_SHARED_NETWORK4,
+        INSERT_SHARED_NETWORK4_SERVER,
+        INSERT_OPTION_DEF4,
+        INSERT_OPTION_DEF4_CLIENT_CLASS,
+        INSERT_OPTION_DEF4_SERVER,
+        INSERT_OPTION4,
+        INSERT_OPTION4_SERVER,
+        INSERT_CLIENT_CLASS4,
+        INSERT_CLIENT_CLASS4_SERVER,
+        INSERT_CLIENT_CLASS4_DEPENDENCY,
+        INSERT_SERVER4,
+        UPDATE_GLOBAL_PARAMETER4,
+        UPDATE_SUBNET4,
+        UPDATE_SHARED_NETWORK4,
+        UPDATE_OPTION_DEF4,
+        UPDATE_OPTION_DEF4_CLIENT_CLASS,
+        UPDATE_OPTION4,
+        UPDATE_OPTION4_SUBNET_ID,
+        UPDATE_OPTION4_POOL_ID,
+        UPDATE_OPTION4_SHARED_NETWORK,
+        UPDATE_OPTION4_CLIENT_CLASS,
+        UPDATE_CLIENT_CLASS4,
+        UPDATE_CLIENT_CLASS4_SAME_POSITION,
+        UPDATE_SERVER4,
+        DELETE_GLOBAL_PARAMETER4,
+        DELETE_ALL_GLOBAL_PARAMETERS4,
+        DELETE_ALL_GLOBAL_PARAMETERS4_UNASSIGNED,
+        DELETE_SUBNET4_ID_WITH_TAG,
+        DELETE_SUBNET4_ID_ANY,
+        DELETE_SUBNET4_PREFIX_WITH_TAG,
+        DELETE_SUBNET4_PREFIX_ANY,
+        DELETE_ALL_SUBNETS4,
+        DELETE_ALL_SUBNETS4_UNASSIGNED,
+        DELETE_ALL_SUBNETS4_SHARED_NETWORK_NAME,
+        DELETE_SUBNET4_SERVER,
+        DELETE_POOLS4,
+        DELETE_SHARED_NETWORK4_NAME_WITH_TAG,
+        DELETE_SHARED_NETWORK4_NAME_ANY,
+        DELETE_ALL_SHARED_NETWORKS4,
+        DELETE_ALL_SHARED_NETWORKS4_UNASSIGNED,
+        DELETE_SHARED_NETWORK4_SERVER,
+        DELETE_OPTION_DEF4_CODE_NAME,
+        DELETE_ALL_OPTION_DEFS4,
+        DELETE_ALL_OPTION_DEFS4_UNASSIGNED,
+        DELETE_OPTION_DEFS4_CLIENT_CLASS,
+        DELETE_OPTION4,
+        DELETE_ALL_GLOBAL_OPTIONS4_UNASSIGNED,
+        DELETE_OPTION4_SUBNET_ID,
+        DELETE_OPTION4_POOL_RANGE,
+        DELETE_OPTION4_SHARED_NETWORK,
+        DELETE_OPTIONS4_SUBNET_ID_PREFIX,
+        DELETE_OPTIONS4_SHARED_NETWORK,
+        DELETE_OPTIONS4_CLIENT_CLASS,
+        DELETE_CLIENT_CLASS4_DEPENDENCY,
+        DELETE_CLIENT_CLASS4_SERVER,
+        DELETE_ALL_CLIENT_CLASSES4,
+        DELETE_ALL_CLIENT_CLASSES4_UNASSIGNED,
+        DELETE_CLIENT_CLASS4,
+        DELETE_CLIENT_CLASS4_ANY,
+        DELETE_SERVER4,
+        DELETE_ALL_SERVERS4,
+        GET_LAST_INSERT_ID4,
+        NUM_STATEMENTS
+    };
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit PgSqlConfigBackendDHCPv4Impl(const DatabaseConnection::ParameterMap&
+                                          parameters);
+
+    /// @brief Destructor.
+    ~PgSqlConfigBackendDHCPv4Impl();
+
+    /// @brief Fetches the SQL statement for a given statement index.
+    ///
+    /// @param index index of the desired statement.
+    /// @throw BadValue if there is no statement corresponding to
+    /// the index.
+    virtual PgSqlTaggedStatement& getStatement(size_t index) const;
+
+    /// @brief Sends query to retrieve global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the parameter to be retrieved.
+    ///
+    /// @return Pointer to the retrieved value or null if such parameter
+    /// doesn't exist.
+    StampedValuePtr getGlobalParameter4(const ServerSelector& server_selector,
+                                        const std::string& name) {
+        StampedValueCollection parameters;
+
+        auto const& tags = server_selector.getTags();
+        for (auto const& tag : tags) {
+            PsqlBindArray in_bindings;
+            in_bindings.addTempString(tag.get());
+            in_bindings.add(name);
+
+            getGlobalParameters(GET_GLOBAL_PARAMETER4, in_bindings, parameters);
+        }
+
+        return (parameters.empty() ? StampedValuePtr() : *parameters.begin());
+    }
+
+    /// @brief Sends query to insert or update global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param value StampedValue describing the parameter to create/update.
+    void createUpdateGlobalParameter4(const db::ServerSelector& server_selector,
+                                      const StampedValuePtr& value) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        auto tag = getServerTag(server_selector, "creating or updating global parameter");
+
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(value->getName());
+        in_bindings.addTempString(value->getValue());
+        in_bindings.add(value->getType()),
+        in_bindings.addTimestamp(value->getModificationTime()),
+        in_bindings.addTempString(tag);
+        in_bindings.addTempString(value->getName());
+
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision audit_revision(this,
+                                           PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                                           server_selector, "global parameter set",
+                                           false);
+
+        // Try to update the existing row.
+        if (updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::UPDATE_GLOBAL_PARAMETER4,
+                              in_bindings) == 0) {
+            // No such parameter found, so let's insert it. We have to adjust the
+            // bindings collection to match the prepared statement for insert.
+            in_bindings.popBack();
+            in_bindings.popBack();
+
+            insertQuery(PgSqlConfigBackendDHCPv4Impl::INSERT_GLOBAL_PARAMETER4,
+                        in_bindings);
+
+            // Successfully inserted global parameter. Now, we have to associate it
+            // with the server tag.
+            PsqlBindArray attach_bindings;
+            uint64_t pid = getLastInsertId("dhcp4_global_parameter", "id");
+            attach_bindings.add(pid);   // id of newly inserted global.
+            attach_bindings.addTimestamp(value->getModificationTime());
+            attachElementToServers(PgSqlConfigBackendDHCPv4Impl::INSERT_GLOBAL_PARAMETER4_SERVER,
+                                   server_selector, attach_bindings);
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Sends query to the database to retrieve multiple subnets.
+    ///
+    /// Query should order subnets by subnet_id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] subnets Reference to the container where fetched subnets
+    /// will be inserted.
+    void getSubnets4(const StatementIndex& index,
+                     const ServerSelector& server_selector,
+                     const PsqlBindArray& in_bindings,
+                     Subnet4Collection& subnets) {
+        uint64_t last_pool_id = 0;
+        uint64_t last_pool_option_id = 0;
+        uint64_t last_option_id = 0;
+        Pool4Ptr last_pool;
+        std::string last_tag;
+
+        // Execute actual query.
+        selectQuery(index, in_bindings,
+                    [this, &subnets, &last_pool, &last_pool_id,
+                     &last_pool_option_id, &last_option_id, &last_tag](PgSqlResult& r, int row) {
+            // Create a convenience worker for the row.
+            PgSqlResultRowWorker worker(r, row);
+
+            // Get pointer to the last subnet in the collection.
+            Subnet4Ptr last_subnet;
+            if (!subnets.empty()) {
+                last_subnet = *subnets.rbegin();
+            }
+            // Subnet_id is column 0.
+            SubnetID subnet_id = worker.getInt(0) ;
+
+            // Subnet has been returned. Assuming that subnets are ordered by
+            // subnet identifier, if the subnet identifier of the current row
+            // is different than the subnet identifier of the previously returned
+            // row, it means that we have to construct new subnet object.
+            if (!last_subnet || (last_subnet->getID() != subnet_id)) {
+                // Reset per subnet component tracking and server tag because
+                // we're now starting to process a new subnet.
+                last_pool_id = 0;
+                last_pool_option_id = 0;
+                last_option_id = 0;
+                last_pool.reset();
+                last_tag.clear();
+
+                // Get subnet parameters required by the constructor first.
+
+                // subnet_prefix at 1.
+                std::string subnet_prefix = worker.getString(1);
+                auto prefix_pair = Subnet4::parsePrefix(subnet_prefix);
+
+                // renew_timer at 13.
+                auto renew_timer = worker.getTriplet(13);
+
+                // rebind_timer at 11.
+                auto rebind_timer = worker.getTriplet(11);
+
+                // valid_lifetime at 19.
+                // min_valid_lifetime at 55.
+                // max_valid_lifetime at 56.
+                auto valid_lifetime = worker.getTriplet(19, 55, 56);
+
+                // Create subnet with basic settings.
+                last_subnet = Subnet4::create(prefix_pair.first, prefix_pair.second,
+                                              renew_timer, rebind_timer,
+                                              valid_lifetime, subnet_id);
+
+                // Get other subnet parameters.
+                // 4o6_interface at 2.
+                if (!worker.isColumnNull(2)) {
+                    last_subnet->get4o6().setIface4o6(worker.getString(2));
+                }
+
+                // 4o6_interface_id at 3.
+                if (!worker.isColumnNull(3)) {
+                    std::string dhcp4o6_interface_id = worker.getString(3);
+                    OptionBuffer dhcp4o6_interface_id_buf(dhcp4o6_interface_id.begin(),
+                                                          dhcp4o6_interface_id.end());
+                    OptionPtr option_dhcp4o6_interface_id =
+                        Option::create(Option::V6, D6O_INTERFACE_ID, dhcp4o6_interface_id_buf);
+                    last_subnet->get4o6().setInterfaceId(option_dhcp4o6_interface_id);
+                }
+
+                // 4o6_subnet at 4.
+                if (!worker.isColumnNull(4)) {
+                    std::pair<IOAddress, uint8_t> dhcp4o6_subnet_prefix_pair =
+                        Subnet6::parsePrefix(worker.getString(4));
+                    last_subnet->get4o6().setSubnet4o6(dhcp4o6_subnet_prefix_pair.first,
+                                                       dhcp4o6_subnet_prefix_pair.second);
+                }
+
+                // boot_file_name at 5.
+                if (!worker.isColumnNull(5)) {
+                    last_subnet->setFilename(worker.getString(5));
+                }
+
+                // client_class at 6.
+                if (!worker.isColumnNull(6)) {
+                    last_subnet->allowClientClass(worker.getString(6));
+                }
+
+                // interface at 7.
+                if (!worker.isColumnNull(7)) {
+                    last_subnet->setIface(worker.getString(7));
+                }
+
+                // match_client_id at 8.
+                if (!worker.isColumnNull(8)) {
+                    last_subnet->setMatchClientId(worker.getBool(8));
+                }
+
+                // modification_ts at 9.
+                last_subnet->setModificationTime(worker.getTimestamp(9));
+
+                // next_server at 10.
+                if (!worker.isColumnNull(10)) {
+                    last_subnet->setSiaddr(worker.getInet4(10));
+                }
+
+                // rebind_timer at 11 (fetched before subnet create).
+
+                // Relay addresses at 12.
+                setRelays(worker, 12, *last_subnet);
+
+                // renew_timer at 13 (fetched before subnet create).
+
+                // require_client_classes at 14.
+                setRequiredClasses(worker, 14, [&last_subnet](const std::string& class_name) {
+                    last_subnet->requireClientClass(class_name);
+                });
+
+                // reservations_global at 15.
+                if (!worker.isColumnNull(15)) {
+                    last_subnet->setReservationsGlobal(worker.getBool(15));
+                }
+
+                // server_hostname at 16.
+                if (!worker.isColumnNull(16)) {
+                    last_subnet->setSname(worker.getString(16));
+                }
+
+                // shared_network_name at 17.
+                if (!worker.isColumnNull(17)) {
+                    last_subnet->setSharedNetworkName(worker.getString(17));
+                }
+
+                // user_context at 18.
+                if (!worker.isColumnNull(18)) {
+                    ElementPtr user_context = worker.getJSON(18);
+                    if (user_context) {
+                        last_subnet->setContext(user_context);
+                    }
+                }
+
+                // valid_lifetime at 19 (fetched before subnet create).
+
+                // pool and options from 20 to 50.
+
+                // calculate_tee_times at 51.
+                if (!worker.isColumnNull(51)) {
+                    last_subnet->setCalculateTeeTimes(worker.getBool(51));
+                }
+
+                // t1_percent at 52.
+                if (!worker.isColumnNull(52)) {
+                    last_subnet->setT1Percent(worker.getDouble(52));
+                }
+
+                // t2_percent at 53.
+                if (!worker.isColumnNull(53)) {
+                    last_subnet->setT2Percent(worker.getDouble(53));
+                }
+
+                // authoritative at 54.
+                if (!worker.isColumnNull(54)) {
+                    last_subnet->setAuthoritative(worker.getBool(54));
+                }
+
+                // min_valid_lifetime at 55 (fetched as part of triplet).
+                // max_valid_lifetime at 56 (fetched as part of triplet).
+
+                // pool client_class, require_client_classes and user_context
+                // from 57 to 59.
+
+                // ddns_send_updates at 60.
+                if (!worker.isColumnNull(60)) {
+                    last_subnet->setDdnsSendUpdates(worker.getBool(60));
+                }
+
+                // ddns_override_no_update at 61.
+                if (!worker.isColumnNull(61)) {
+                    last_subnet->setDdnsOverrideNoUpdate(worker.getBool(61));
+                }
+
+                // ddns_override_client_update at 62.
+                if (!worker.isColumnNull(62)) {
+                    last_subnet->setDdnsOverrideClientUpdate(worker.getBool(62));
+                }
+
+                // ddns_replace_client_name at 63.
+                if (!worker.isColumnNull(63)) {
+                    last_subnet->setDdnsReplaceClientNameMode(
+                        static_cast<D2ClientConfig::ReplaceClientNameMode>(worker.getSmallInt(63)));
+                }
+
+                // ddns_generated_prefix at 64.
+                if (!worker.isColumnNull(64)) {
+                    last_subnet->setDdnsGeneratedPrefix(worker.getString(64));
+                }
+
+                // ddns_qualifying_suffix at 65.
+                if (!worker.isColumnNull(65)) {
+                    last_subnet->setDdnsQualifyingSuffix(worker.getString(65));
+                }
+
+                // reservations_in_subnet at 66.
+                if (!worker.isColumnNull(66)) {
+                    last_subnet->setReservationsInSubnet(worker.getBool(66));
+                }
+
+                // reservations_out_of_pool at 67.
+                if (!worker.isColumnNull(67)) {
+                    last_subnet->setReservationsOutOfPool(worker.getBool(67));
+                }
+
+                // cache_threshold at 68.
+                if (!worker.isColumnNull(68)) {
+                    last_subnet->setCacheThreshold(worker.getDouble(68));
+                }
+
+                // cache_max_age at 69.
+                if (!worker.isColumnNull(69)) {
+                    last_subnet->setCacheMaxAge(worker.getInt(69));
+                }
+
+                // offer_lifetime at 70.
+                if (!worker.isColumnNull(70)) {
+                    last_subnet->setOfferLft(worker.getInt(70));
+                }
+
+                // allocator at 71.
+                if (!worker.isColumnNull(71)) {
+                    last_subnet->setAllocatorType(worker.getString(71));
+                }
+
+                // server_tag at 72.
+
+                // Subnet ready. Add it to the list.
+                auto ret = subnets.insert(last_subnet);
+
+                // subnets is a multi index container with unique indexes
+                // but these indexes are unique too in the database,
+                // so this is for sanity only.
+                if (!ret.second) {
+                    isc_throw(Unexpected, "add subnet failed");
+                }
+            }
+
+            // Check for new server tags at 71.
+            if (!worker.isColumnNull(72)) {
+                std::string new_tag = worker.getString(72);
+                if (last_tag != new_tag) {
+                    if (!new_tag.empty() && !last_subnet->hasServerTag(ServerTag(new_tag))) {
+                        last_subnet->setServerTag(new_tag);
+                    }
+
+                    last_tag = new_tag;
+                }
+            }
+
+            // If the row contains information about the pool and it appears to be
+            // new pool entry (checked by comparing pool id), let's create the new
+            // pool and add it to the subnet.
+            // pool id at 20.
+            // pool start_address at 21.
+            // pool end_address at 22.
+            // pool subnet_id at 23 (ignored)
+            // pool modification_ts at 24 (ignored)
+            if (!worker.isColumnNull(20) &&
+                (worker.getInet4(21) != 0) &&
+                (worker.getInet4(22) != 0) &&
+                (worker.getBigInt(20) > last_pool_id)) {
+                last_pool_id = worker.getBigInt(20);
+                last_pool = Pool4::create(IOAddress(worker.getInet4(21)),
+                                          IOAddress(worker.getInet4(22)));
+
+                // pool client_class at 57.
+                if (!worker.isColumnNull(57)) {
+                    last_pool->allowClientClass(worker.getString(57));
+                }
+
+                // pool require_client_classes at 58.
+                setRequiredClasses(worker, 58, [&last_pool](const std::string& class_name) {
+                    last_pool->requireClientClass(class_name);
+                });
+
+                // pool user_context at 59.
+                if (!worker.isColumnNull(59)) {
+                    ElementPtr user_context = worker.getJSON(59);
+                    if (user_context) {
+                        last_pool->setContext(user_context);
+                    }
+                }
+
+                last_subnet->addPool(last_pool);
+            }
+
+            // Parse pool-specific option from 25 to 37.
+            if (last_pool && !worker.isColumnNull(25) &&
+                (last_pool_option_id < worker.getBigInt(25))) {
+                last_pool_option_id = worker.getBigInt(25);
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V4, worker, 25);
+                if (desc) {
+                    last_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+
+            // Parse subnet-specific option from 38 to 50.
+            if (!worker.isColumnNull(38) &&
+                (last_option_id < worker.getBigInt(38))) {
+                last_option_id = worker.getBigInt(38);
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V4, worker, 38);
+                if (desc) {
+                    last_subnet->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        // Now that we're done fetching the whole subnet, we have to
+        // check if it has matching server tags and toss it if it
+        // doesn't. We skip matching the server tags if we're asking
+        // for ANY subnet.
+        auto& subnet_index = subnets.get<SubnetSubnetIdIndexTag>();
+        tossNonMatchingElements(server_selector, subnet_index);
+    }
+
+    /// @brief Sends query to retrieve single subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Subnet identifier.
+    ///
+    /// @return Pointer to the returned subnet or NULL if such subnet
+    /// doesn't exist.
+    Subnet4Ptr getSubnet4(const ServerSelector& server_selector,
+                          const SubnetID& subnet_id) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a subnet. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet_id);
+
+        auto index = GET_SUBNET4_ID_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = GET_SUBNET4_ID_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = GET_SUBNET4_ID_ANY;
+        }
+
+        Subnet4Collection subnets;
+        getSubnets4(index, server_selector, in_bindings, subnets);
+
+        return (subnets.empty() ? Subnet4Ptr() : *subnets.begin());
+    }
+
+    /// @brief Sends query to retrieve single subnet by prefix.
+    ///
+    /// The prefix should be in the following format: "192.0.2.0/24".
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Subnet identifier.
+    ///
+    /// @return Pointer to the returned subnet or NULL if such subnet
+    /// doesn't exist.
+    Subnet4Ptr getSubnet4(const ServerSelector& server_selector,
+                          const std::string& subnet_prefix) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a subnet. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet_prefix);
+
+        auto index = GET_SUBNET4_PREFIX_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = GET_SUBNET4_PREFIX_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = GET_SUBNET4_PREFIX_ANY;
+        }
+
+        Subnet4Collection subnets;
+        getSubnets4(index, server_selector, in_bindings, subnets);
+
+        return (subnets.empty() ? Subnet4Ptr() : *subnets.begin());
+    }
+
+    /// @brief Sends query to retrieve all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getAllSubnets4(const ServerSelector& server_selector,
+                        Subnet4Collection& subnets) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching all subnets for ANY "
+                      "server is not supported");
+        }
+
+        auto index = (server_selector.amUnassigned() ? GET_ALL_SUBNETS4_UNASSIGNED :
+                      GET_ALL_SUBNETS4);
+        PsqlBindArray in_bindings;
+        getSubnets4(index, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve modified subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getModifiedSubnets4(const ServerSelector& server_selector,
+                             const boost::posix_time::ptime& modification_ts,
+                             Subnet4Collection& subnets) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified subnets for ANY "
+                      "server is not supported");
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.addTimestamp(modification_ts);
+
+        auto index = (server_selector.amUnassigned() ? GET_MODIFIED_SUBNETS4_UNASSIGNED :
+                      GET_MODIFIED_SUBNETS4);
+        getSubnets4(index, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve all subnets belonging to a shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be retrieved.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getSharedNetworkSubnets4(const ServerSelector& server_selector,
+                                  const std::string& shared_network_name,
+                                  Subnet4Collection& subnets) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(shared_network_name);
+        getSubnets4(GET_SHARED_NETWORK_SUBNETS4, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve multiple pools.
+    ///
+    /// Query should order pools by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] pools Reference to the container where fetched pools
+    /// will be inserted.
+    /// @param [out] pool_ids Identifiers of the pools returned in @c pools
+    /// argument.
+    void getPools(const StatementIndex& index,
+                  const PsqlBindArray& in_bindings,
+                  PoolCollection& pools,
+                  std::vector<uint64_t>& pool_ids) {
+        uint64_t last_pool_id = 0;
+        uint64_t last_pool_option_id = 0;
+        Pool4Ptr last_pool;
+
+        selectQuery(index, in_bindings,
+                    [this, &last_pool_id, &last_pool_option_id, &last_pool, &pools, &pool_ids]
+                    (PgSqlResult& r, int row) {
+            // Create a convenience worker for the row.
+            PgSqlResultRowWorker worker(r, row);
+
+            // Pool id is column 0.
+            auto id = worker.getBigInt(0) ;
+            if (id > last_pool_id) {
+                // pool start_address (1)
+                // pool end_address (2)
+                last_pool_id = id;
+
+                last_pool = Pool4::create(worker.getInet4(1), worker.getInet4(2));
+
+                // pool subnet_id (3) (ignored)
+
+                // pool client_class (4)
+                if (!worker.isColumnNull(4)) {
+                    last_pool->allowClientClass(worker.getString(4));
+                }
+
+                // pool require_client_classes (5)
+                setRequiredClasses(worker, 5, [&last_pool](const std::string& class_name) {
+                    last_pool->requireClientClass(class_name);
+                });
+
+                // pool user_context (6)
+                if (!worker.isColumnNull(6)) {
+                    ElementPtr user_context = worker.getJSON(6);
+                    if (user_context) {
+                        last_pool->setContext(user_context);
+                    }
+                }
+
+                // pool: modification_ts (7) (ignored)
+
+                pools.push_back(last_pool);
+                pool_ids.push_back(last_pool_id);
+            }
+
+            // Parse pool specific option (8).
+            if (last_pool && !worker.isColumnNull(8) &&
+                (last_pool_option_id < worker.getBigInt(8))) {
+                last_pool_option_id = worker.getBigInt(8);
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V4, worker, 8);
+                if (desc) {
+                    last_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+    }
+
+    /// @brief Sends query to retrieve single pool by address range.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound pool address.
+    /// @param pool_end_address Upper bound pool address.
+    /// @param pool_id Pool identifier for the returned pool.
+    /// @return Pointer to the pool or null if no such pool found.
+    Pool4Ptr getPool4(const ServerSelector& server_selector,
+                      const IOAddress& pool_start_address,
+                      const IOAddress& pool_end_address,
+                      uint64_t& pool_id) {
+        PoolCollection pools;
+        std::vector<uint64_t> pool_ids;
+
+        if (server_selector.amAny()) {
+            PsqlBindArray in_bindings;
+            in_bindings.addInet4(pool_start_address);
+            in_bindings.addInet4(pool_end_address);
+            getPools(GET_POOL4_RANGE_ANY, in_bindings, pools, pool_ids);
+        } else {
+            auto const& tags = server_selector.getTags();
+            for (auto const& tag : tags) {
+                PsqlBindArray in_bindings;
+                in_bindings.addTempString(tag.get());
+                in_bindings.addInet4(pool_start_address);
+                in_bindings.addInet4(pool_end_address);
+
+                getPools(GET_POOL4_RANGE, in_bindings, pools, pool_ids);
+                // Break if something is found?
+            }
+        }
+
+        // Return upon the first pool found.
+        if (!pools.empty()) {
+            pool_id = pool_ids[0];
+            return (boost::dynamic_pointer_cast<Pool4>(*pools.begin()));
+        }
+
+        pool_id = 0;
+
+        return (Pool4Ptr());
+    }
+
+    /// @brief Sends query to insert or update subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet to be inserted or updated.
+    void createUpdateSubnet4(const ServerSelector& server_selector,
+                             const Subnet4Ptr& subnet) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "creating or updating a subnet for ANY"
+                      " server is not supported");
+
+        } else if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        // Create input bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet->getID());
+        in_bindings.addTempString(subnet->toText());
+        in_bindings.addOptional(subnet->get4o6().getIface4o6());
+
+        // Convert DHCPv4o6 interface id to text.
+        OptionPtr dhcp4o6_interface_id = subnet->get4o6().getInterfaceId();
+        if (dhcp4o6_interface_id) {
+            in_bindings.addTempString(std::string(dhcp4o6_interface_id->getData().begin(),
+                                                  dhcp4o6_interface_id->getData().end()));
+
+        } else {
+            in_bindings.addNull();
+        }
+
+        // Convert DHCPv4o6 subnet to text.
+        Optional<std::string> dhcp4o6_subnet;
+        if (!subnet->get4o6().getSubnet4o6().unspecified() &&
+            (!subnet->get4o6().getSubnet4o6().get().first.isV6Zero() ||
+             (subnet->get4o6().getSubnet4o6().get().second != 128u))) {
+            std::ostringstream s;
+            s << subnet->get4o6().getSubnet4o6().get().first << "/"
+              << static_cast<int>(subnet->get4o6().getSubnet4o6().get().second);
+            dhcp4o6_subnet = s.str();
+        }
+
+        in_bindings.addOptional(dhcp4o6_subnet);
+
+        in_bindings.addOptional(subnet->getFilename(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getClientClass(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getIface(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getMatchClientId(Network::Inheritance::NONE));
+        in_bindings.addTimestamp(subnet->getModificationTime());
+        in_bindings.addOptionalInet4(subnet->getSiaddr(Network::Inheritance::NONE));
+        in_bindings.add(subnet->getT2(Network::Inheritance::NONE));
+        addRelayBinding(in_bindings, subnet);
+        in_bindings.add(subnet->getT1(Network::Inheritance::NONE));
+        addRequiredClassesBinding(in_bindings, subnet);
+        in_bindings.addOptional(subnet->getReservationsGlobal(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getSname(Network::Inheritance::NONE));
+
+        // Add shared network.
+        SharedNetwork4Ptr shared_network;
+        subnet->getSharedNetwork(shared_network);
+
+        // Check if the subnet is associated with a shared network instance.
+        // If it is, create the binding using the name of the shared network.
+        if (shared_network) {
+            in_bindings.addTempString(shared_network->getName());
+
+        // If the subnet is associated with a shared network by name (no
+        // shared network instance), use this name to create the binding.
+        // This may be the case if the subnet is added as a result of
+        // receiving a control command that merely specifies shared
+        // network name. In that case, it is expected that the shared
+        // network data is already stored in the database.
+        } else if (!subnet->getSharedNetworkName().empty()) {
+            in_bindings.addTempString(subnet->getSharedNetworkName());
+
+        // If the subnet is not associated with a shared network, create
+        // null binding.
+        } else {
+             in_bindings.addNull();
+        }
+
+        in_bindings.add(subnet->getContext());
+        in_bindings.add(subnet->getValid(Network::Inheritance::NONE));
+        in_bindings.addMin(subnet->getValid(Network::Inheritance::NONE));
+        in_bindings.addMax(subnet->getValid(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getCalculateTeeTimes(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getT1Percent(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getT2Percent(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getAuthoritative(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getDdnsSendUpdates(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getDdnsOverrideNoUpdate(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getDdnsOverrideClientUpdate(Network::Inheritance::NONE));
+        addDdnsReplaceClientNameBinding(in_bindings, subnet);
+        in_bindings.addOptional(subnet->getDdnsGeneratedPrefix(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getDdnsQualifyingSuffix(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getReservationsInSubnet(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getReservationsOutOfPool(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getCacheThreshold(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getCacheMaxAge(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getOfferLft(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getAllocatorType(Network::Inheritance::NONE));
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision audit_revision(this,
+                                           PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                                           server_selector, "subnet set", true);
+
+        // Create a savepoint in case we are called as part of larger
+        // transaction.
+        conn_.createSavepoint("createUpdateSubnet4");
+
+        try {
+
+            insertQuery(PgSqlConfigBackendDHCPv4Impl::INSERT_SUBNET4, in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            // It already exists, rollback to the savepoint to preserve
+            // any prior work.
+            conn_.rollbackToSavepoint("createUpdateSubnet4");
+
+            // We're updating, so we need to remove any existing pools and options.
+            deletePools4(subnet);
+            deleteOptions4(ServerSelector::ANY(), subnet);
+
+            // Now we need to add two more bindings for WHERE clause.
+            in_bindings.add(subnet->getID());
+            in_bindings.addTempString(subnet->toText());
+
+            // Attempt the update.
+            auto cnt = updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::UPDATE_SUBNET4,
+                                         in_bindings);
+            if (!cnt) {
+                // Possible only if someone deleted it since we tried to insert it
+                // or the query is broken.
+                isc_throw(Unexpected, "Update subnet failed to find subnet id: "
+                          << subnet->getID() << ", prefix: " << subnet->toText());
+            }
+
+            // Remove existing server association.
+            PsqlBindArray server_bindings;
+            server_bindings.add(subnet->getID());
+            updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_SERVER,
+                              server_bindings);
+        }
+
+        // Subnet was successfully created/updated.
+
+        // Insert associations with the servers.
+        PsqlBindArray attach_bindings;
+        attach_bindings.add(subnet->getID());
+        attach_bindings.addTimestamp(subnet->getModificationTime());
+        attachElementToServers(PgSqlConfigBackendDHCPv4Impl::INSERT_SUBNET4_SERVER,
+                               server_selector, attach_bindings);
+
+        // (Re)create pools.
+        for (auto pool : subnet->getPools(Lease::TYPE_V4)) {
+            createPool4(server_selector, boost::dynamic_pointer_cast<Pool4>(pool),
+                        subnet);
+        }
+
+        // (Re)create options.
+        auto option_spaces = subnet->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = subnet->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption4(server_selector, subnet->getID(), desc_copy,
+                                    true);
+            }
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Inserts new IPv4 pool to the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool Pointer to the pool to be inserted.
+    /// @param subnet Pointer to the subnet that this pool belongs to.
+    void createPool4(const ServerSelector& server_selector,
+                     const Pool4Ptr& pool,
+                     const Subnet4Ptr& subnet) {
+        // Create the input bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.addInet4(pool->getFirstAddress());
+        in_bindings.addInet4(pool->getLastAddress());
+        in_bindings.add(subnet->getID());
+        in_bindings.addOptional(pool->getClientClass());
+        addRequiredClassesBinding(in_bindings, pool);
+        in_bindings.add(pool->getContext());
+        in_bindings.addTimestamp(subnet->getModificationTime());
+
+        // Attempt to INSERT the pool.
+        insertQuery(PgSqlConfigBackendDHCPv4Impl::INSERT_POOL4, in_bindings);
+
+        // Get the id of the newly inserted pool.
+        uint64_t pool_id = getLastInsertId("dhcp4_pool", "id");
+
+        // Add the pool's options.
+        auto option_spaces = pool->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = pool->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption4(server_selector, pool_id, desc_copy, true);
+            }
+        }
+    }
+
+    /// @brief Sends a query to delete data from a table.
+    ///
+    /// If creates a new audit revision for this change if such audit
+    /// revision doesn't exist yet (using ScopedAuditRevision mechanism).
+    ///
+    /// @tparam Args type of the arguments to be passed to one of the existing
+    /// @c deleteFromTable methods.
+    /// @param server_selector server selector.
+    /// @param operation operation which results in calling this function. This is
+    /// used for logging purposes.
+    /// @param log_message log message to be associated with the audit revision.
+    /// @param cascade_delete boolean flag indicating if we're performing
+    /// cascade delete. If set to true, the audit entries for the child
+    /// objects (e.g. DHCPoptions) won't be created.
+    /// @param keys arguments to be passed to one of the existing
+    /// @c deleteFromTable methods.
+    ///
+    /// @return Number of deleted entries.
+    template<typename... Args>
+    uint64_t deleteTransactional(const int index,
+                                 const db::ServerSelector& server_selector,
+                                 const std::string& operation,
+                                 const std::string& log_message,
+                                 const bool cascade_delete,
+                                 Args&&... keys) {
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, log_message, cascade_delete);
+
+        auto count = deleteFromTable(index, server_selector, operation, keys...);
+
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Sends query to delete subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    uint64_t deleteSubnet4(const ServerSelector& server_selector,
+                           const SubnetID& subnet_id) {
+        int index = (server_selector.amAny() ?
+                     PgSqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_ID_ANY :
+                     PgSqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_ID_WITH_TAG);
+        return (deleteTransactional(index, server_selector,
+                                    "deleting a subnet", "subnet deleted",
+                                    true, static_cast<uint32_t>(subnet_id)));
+    }
+
+    /// @brief Sends query to delete subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    uint64_t deleteSubnet4(const ServerSelector& server_selector,
+                           const std::string& subnet_prefix) {
+        int index = (server_selector.amAny() ?
+                     PgSqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_PREFIX_ANY :
+                     PgSqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_PREFIX_WITH_TAG);
+        return (deleteTransactional(index, server_selector,
+                                    "deleting a subnet", "subnet deleted",
+                                    true, subnet_prefix));
+    }
+
+    /// @brief Deletes pools belonging to a subnet from the database.
+    ///
+    /// The query deletes all pools associated with the subnet's
+    /// identifier or prefix.
+    /// @param subnet Pointer to the subnet for which pools should be
+    /// deleted.
+    uint64_t deletePools4(const Subnet4Ptr& subnet) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet->getID());
+        in_bindings.addTempString(subnet->toText());
+
+        // Run DELETE.
+        return (updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::DELETE_POOLS4,
+                                  in_bindings));
+    }
+
+    /// @brief Sends query to the database to retrieve multiple shared
+    /// networks.
+    ///
+    /// Query should order shared networks by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] shared_networks Reference to the container where fetched
+    /// shared networks will be inserted.
+    void getSharedNetworks4(const StatementIndex& index,
+                            const ServerSelector& server_selector,
+                            const PsqlBindArray& in_bindings,
+                            SharedNetwork4Collection& shared_networks) {
+        uint64_t last_network_id = 0;
+        uint64_t last_option_id = 0;
+        std::string last_tag;
+
+        selectQuery(index, in_bindings,
+                    [this, &shared_networks, &last_network_id, &last_option_id, &last_tag]
+                    (PgSqlResult& r, int row) {
+            // Create a convenience worker for the row.
+            PgSqlResultRowWorker worker(r, row);
+
+            SharedNetwork4Ptr last_network;
+            if (!shared_networks.empty()) {
+                last_network = *shared_networks.rbegin();
+            }
+
+            // Network id is column 0.
+            auto network_id = worker.getBigInt(0) ;
+
+            // If this is the first shared network or the shared network id in this
+            // row points to the next shared network we use the data in the
+            // row to create the new shared network instance.
+            if (last_network_id != network_id) {
+                last_network_id = network_id;
+
+                // Reset per shared network component tracking and server tag because
+                // we're now starting to process a new shared network.
+                last_option_id = 0;
+                last_tag.clear();
+
+                // name at 1.
+                last_network = SharedNetwork4::create(worker.getString(1));
+                last_network->setId(last_network_id);
+
+                // client_class at 2.
+                if (!worker.isColumnNull(2)) {
+                    last_network->allowClientClass(worker.getString(2));
+                }
+
+                // interface at 3.
+                if (!worker.isColumnNull(3)) {
+                    last_network->setIface(worker.getString(3));
+                }
+
+                // match_client_id at 4.
+                if (!worker.isColumnNull(4)) {
+                    last_network->setMatchClientId(worker.getBool(4));
+                }
+
+                // modification_ts at 5.
+                last_network->setModificationTime(worker.getTimestamp(5));
+
+                // rebind_timer at 6.
+                if (!worker.isColumnNull(6)) {
+                    last_network->setT2(worker.getTriplet(6));
+                }
+
+                // Relay addresses at 7.
+                setRelays(worker, 7, *last_network);
+
+                // renew_timer at 8.
+                if (!worker.isColumnNull(8)) {
+                    last_network->setT1(worker.getTriplet(8));
+                }
+
+                // require_client_classes at 9.
+                setRequiredClasses(worker, 9, [&last_network](const std::string& class_name) {
+                    last_network->requireClientClass(class_name);
+                });
+
+                // reservations_global at 10.
+                if (!worker.isColumnNull(10)) {
+                    last_network->setReservationsGlobal(worker.getBool(10));
+                }
+
+                // user_context at 11.
+                if (!worker.isColumnNull(11)) {
+                    ElementPtr user_context = worker.getJSON(11);
+                    if (user_context) {
+                        last_network->setContext(user_context);
+                    }
+                }
+
+                // valid_lifetime at 12.
+                // min_valid_lifetime at 33.
+                // max_valid_lifetime at 34.
+                if (!worker.isColumnNull(12)) {
+                    last_network->setValid(worker.getTriplet(12, 33, 34));
+                }
+
+                // option from 13 to 25.
+
+                // calculate_tee_times at 26.
+                if (!worker.isColumnNull(26)) {
+                    last_network->setCalculateTeeTimes(worker.getBool(26));
+                }
+
+                // t1_percent at 27.
+                if (!worker.isColumnNull(27)) {
+                    last_network->setT1Percent(worker.getDouble(27));
+                }
+
+                // t2_percent at 28.
+                if (!worker.isColumnNull(28)) {
+                    last_network->setT2Percent(worker.getDouble(28));
+                }
+
+                // authoritative at 29.
+                if (!worker.isColumnNull(29)) {
+                    last_network->setAuthoritative(worker.getBool(29));
+                }
+
+                // boot_file_name at 30.
+                if (!worker.isColumnNull(30)) {
+                    last_network->setFilename(worker.getString(30));
+                }
+
+                // next_server at 31.
+                if (!worker.isColumnNull(31)) {
+                    last_network->setSiaddr(worker.getInet4(31));
+                }
+
+                // server_hostname at 32.
+                if (!worker.isColumnNull(32)) {
+                    last_network->setSname(worker.getString(32));
+                }
+
+                // min_valid_lifetime at 33.
+                // max_valid_lifetime at 34.
+
+                // ddns_send_updates at 35.
+                if (!worker.isColumnNull(35)) {
+                    last_network->setDdnsSendUpdates(worker.getBool(35));
+                }
+
+                // ddns_override_no_update at 36.
+                if (!worker.isColumnNull(36)) {
+                    last_network->setDdnsOverrideNoUpdate(worker.getBool(36));
+                }
+
+                // ddns_override_client_update at 37.
+                if (!worker.isColumnNull(37)) {
+                    last_network->setDdnsOverrideClientUpdate(worker.getBool(37));
+                }
+
+                // ddns_replace_client_name at 38.
+                if (!worker.isColumnNull(38)) {
+                    last_network->setDdnsReplaceClientNameMode(
+                        static_cast<D2ClientConfig::ReplaceClientNameMode>(worker.getSmallInt(38)));
+                }
+
+                // ddns_generated_prefix at 39.
+                if (!worker.isColumnNull(39)) {
+                    last_network->setDdnsGeneratedPrefix(worker.getString(39));
+                }
+
+                // ddns_qualifying_suffix at 40.
+                if (!worker.isColumnNull(40)) {
+                    last_network->setDdnsQualifyingSuffix(worker.getString(40));
+                }
+
+                // reservations_in_subnet at 41.
+                if (!worker.isColumnNull(41)) {
+                    last_network->setReservationsInSubnet(worker.getBool(41));
+                }
+
+                // reservations_in_subnet at 42.
+                if (!worker.isColumnNull(42)) {
+                    last_network->setReservationsOutOfPool(worker.getBool(42));
+                }
+
+                // cache_threshold at 43.
+                if (!worker.isColumnNull(43)) {
+                    last_network->setCacheThreshold(worker.getDouble(43));
+                }
+
+                // cache_max_age at 44.
+                if (!worker.isColumnNull(44)) {
+                    last_network->setCacheMaxAge(worker.getInt(44));
+                }
+
+                // offer_lifetime at 45.
+                if (!worker.isColumnNull(45)) {
+                    last_network->setOfferLft(worker.getInt(45));
+                }
+
+                // allocator at 46.
+                if (!worker.isColumnNull(46)) {
+                    last_network->setAllocatorType(worker.getString(46));
+                }
+
+                // server_tag at 47.
+
+                // Add the shared network.
+                auto ret = shared_networks.push_back(last_network);
+
+                // shared_networks is a multi index container with an unique
+                // index but this index is unique too in the database,
+                // so this is for sanity only.
+                if (!ret.second) {
+                    isc_throw(Unexpected, "add shared network failed");
+                }
+            }
+
+            // Check for new server tags.
+            if (!worker.isColumnNull(47)) {
+                std::string new_tag = worker.getString(47);
+                if (last_tag != new_tag) {
+                    if (!new_tag.empty() && !last_network->hasServerTag(ServerTag(new_tag))) {
+                        last_network->setServerTag(new_tag);
+                    }
+
+                    last_tag = new_tag;
+                }
+            }
+
+            // Parse network-specific option from 13 to 25.
+            if (!worker.isColumnNull(13) &&
+                (last_option_id < worker.getBigInt(13))) {
+                last_option_id = worker.getBigInt(13);
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V4, worker, 13);
+                if (desc) {
+                    last_network->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        // Now that we're done fetching the whole network, we have to
+        // check if it has matching server tags and toss it if it
+        // doesn't. We skip matching the server tags if we're asking
+        // for ANY shared network.
+        auto& sn_index = shared_networks.get<SharedNetworkRandomAccessIndexTag>();
+        tossNonMatchingElements(server_selector, sn_index);
+    }
+
+    /// @brief Sends query to retrieve single shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Shared network name.
+    ///
+    /// @return Pointer to the returned shared network or NULL if such shared
+    /// network doesn't exist.
+    SharedNetwork4Ptr getSharedNetwork4(const ServerSelector& server_selector,
+                                        const std::string& name) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a shared network. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.add(name);
+
+        auto index = PgSqlConfigBackendDHCPv4Impl::GET_SHARED_NETWORK4_NAME_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = PgSqlConfigBackendDHCPv4Impl::GET_SHARED_NETWORK4_NAME_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = PgSqlConfigBackendDHCPv4Impl::GET_SHARED_NETWORK4_NAME_ANY;
+        }
+
+        SharedNetwork4Collection shared_networks;
+        getSharedNetworks4(index, server_selector, in_bindings, shared_networks);
+
+        return (shared_networks.empty() ? SharedNetwork4Ptr() : *shared_networks.begin());
+    }
+
+    /// @brief Sends query to retrieve all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] shared_networks Reference to the shared networks collection
+    /// structure where shared networks should be inserted.
+    void getAllSharedNetworks4(const ServerSelector& server_selector,
+                               SharedNetwork4Collection& shared_networks) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching all shared networks for ANY "
+                      "server is not supported");
+        }
+
+        auto index = (server_selector.amUnassigned() ?
+                      PgSqlConfigBackendDHCPv4Impl::GET_ALL_SHARED_NETWORKS4_UNASSIGNED :
+                      PgSqlConfigBackendDHCPv4Impl::GET_ALL_SHARED_NETWORKS4);
+
+        PsqlBindArray in_bindings;
+        getSharedNetworks4(index, server_selector, in_bindings, shared_networks);
+    }
+
+    /// @brief Sends query to retrieve modified shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] shared_networks Reference to the shared networks collection
+    /// structure where shared networks should be inserted.
+    void getModifiedSharedNetworks4(const ServerSelector& server_selector,
+                                    const boost::posix_time::ptime& modification_ts,
+                                    SharedNetwork4Collection& shared_networks) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified shared networks for ANY "
+                      "server is not supported");
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.addTimestamp(modification_ts);
+
+        auto index = (server_selector.amUnassigned() ?
+                      PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_SHARED_NETWORKS4_UNASSIGNED :
+                      PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_SHARED_NETWORKS4);
+        getSharedNetworks4(index, server_selector, in_bindings, shared_networks);
+    }
+
+    /// @brief Sends query to insert or update shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the shared network to be inserted or updated.
+    void createUpdateSharedNetwork4(const ServerSelector& server_selector,
+                                    const SharedNetwork4Ptr& shared_network) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "creating or updating a shared network for ANY"
+                      " server is not supported");
+
+        } else if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(shared_network->getName());
+        in_bindings.addOptional(shared_network->getClientClass(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getIface(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getMatchClientId(Network::Inheritance::NONE));
+        in_bindings.addTimestamp(shared_network->getModificationTime()),
+        in_bindings.add(shared_network->getT2(Network::Inheritance::NONE));
+        addRelayBinding(in_bindings, shared_network);
+        in_bindings.add(shared_network->getT1(Network::Inheritance::NONE));
+        addRequiredClassesBinding(in_bindings, shared_network);
+        in_bindings.addOptional(shared_network->getReservationsGlobal(Network::Inheritance::NONE));
+        in_bindings.add(shared_network->getContext());
+        in_bindings.add(shared_network->getValid(Network::Inheritance::NONE));
+        in_bindings.addMin(shared_network->getValid(Network::Inheritance::NONE));
+        in_bindings.addMax(shared_network->getValid(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getCalculateTeeTimes(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getT1Percent(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getT2Percent(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getAuthoritative(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getFilename(Network::Inheritance::NONE));
+        in_bindings.addOptionalInet4(shared_network->getSiaddr(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getSname(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getDdnsSendUpdates(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getDdnsOverrideNoUpdate(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getDdnsOverrideClientUpdate(Network::Inheritance::NONE));
+        addDdnsReplaceClientNameBinding(in_bindings, shared_network);
+        in_bindings.addOptional(shared_network->getDdnsGeneratedPrefix(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getDdnsQualifyingSuffix(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getReservationsInSubnet(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getReservationsOutOfPool(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getCacheThreshold(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getCacheMaxAge(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getOfferLft(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getAllocatorType(Network::Inheritance::NONE));
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "shared network set", true);
+
+        // Create a savepoint in case we are called as part of larger
+        // transaction.
+        conn_.createSavepoint("createUpdateSharedNetwork4");
+
+        try {
+
+            // Try to insert shared network. The shared network name must be unique,
+            // so if inserting fails with DuplicateEntry exception we'll need to
+            // update existing shared network entry.
+            insertQuery(PgSqlConfigBackendDHCPv4Impl::INSERT_SHARED_NETWORK4,
+                        in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            // It already exists, rollback to the savepoint to preserve
+            // any prior work.
+            conn_.rollbackToSavepoint("createUpdateSharedNetwork4");
+
+            // We're updating, so we need to remove any options.
+            deleteOptions4(ServerSelector::ANY(), shared_network);
+
+            // Need to add one more binding for WHERE clause.
+            in_bindings.addTempString(shared_network->getName());
+
+            // Try the update.
+            updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::UPDATE_SHARED_NETWORK4,
+                              in_bindings);
+
+            // Remove existing server association.
+            PsqlBindArray server_bindings;
+            server_bindings.addTempString(shared_network->getName());
+            updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_SERVER,
+                              server_bindings);
+        }
+
+        // Associate the shared network with the servers.
+        PsqlBindArray attach_bindings;
+        attach_bindings.addTempString(shared_network->getName());
+        attach_bindings.addTimestamp(shared_network->getModificationTime());
+        attachElementToServers(PgSqlConfigBackendDHCPv4Impl::INSERT_SHARED_NETWORK4_SERVER,
+                               server_selector, attach_bindings);
+
+        // (Re)create options.
+        auto option_spaces = shared_network->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = shared_network->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption4(server_selector, shared_network->getName(),
+                                    desc_copy, true);
+            }
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert DHCP option.
+    ///
+    /// This method expects that the server selector contains exactly one
+    /// server tag.  It is intended to be used within a transaction.
+    ///
+    /// @param server_selector Server selector.
+    /// @param in_bindings Collection of bindings representing an option.
+    /// @param modification_ts option's modification timestamp
+    void insertOption4(const ServerSelector& server_selector,
+                       const PsqlBindArray& in_bindings,
+                       const boost::posix_time::ptime& modification_ts) {
+        // Attempt the insert.
+        insertQuery(PgSqlConfigBackendDHCPv4Impl::INSERT_OPTION4, in_bindings);
+
+        // Fetch primary key value of the inserted option. We will use it in the
+        // next INSERT statement to associate this option with the server.
+        auto option_id = getLastInsertId("dhcp4_options", "option_id");
+
+        PsqlBindArray attach_bindings;
+        attach_bindings.add(option_id);   // id of newly inserted global.
+        attach_bindings.addTimestamp(modification_ts);
+
+        // Associate the option with the servers.
+        attachElementToServers(PgSqlConfigBackendDHCPv4Impl::INSERT_OPTION4_SERVER,
+                               server_selector, attach_bindings);
+    }
+
+    /// @brief Sends query to insert or update global DHCP option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const OptionDescriptorPtr& option) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        auto tag = getServerTag(server_selector, "creating or updating global option");
+
+        // Create the input parameter bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.add(option->option_->getType());
+        addOptionValueBinding(in_bindings, option);
+        in_bindings.addOptional(option->formatted_value_);
+        in_bindings.addOptional(option->space_name_);
+        in_bindings.add(option->persistent_);
+        in_bindings.add(option->cancelled_);
+        in_bindings.addNull();
+        in_bindings.addNull();
+        in_bindings.add(0);
+        in_bindings.add(option->getContext());
+        in_bindings.addNull();
+        in_bindings.addNull();
+        in_bindings.addTimestamp(option->getModificationTime());
+
+        // Remember the size before we add where clause arguments.
+        size_t pre_where_size = in_bindings.size();
+
+        // Now we add the update where clause parameters
+        in_bindings.add(tag);
+        in_bindings.add(option->option_->getType());
+        in_bindings.addOptional(option->space_name_);
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "global option set", false);
+
+        // Try to update the option.
+        if (updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION4,
+                              in_bindings) == 0) {
+            // The option doesn't exist, so we'll try to insert it.
+            // Remove the update where clause bindings.
+            while (in_bindings.size() > pre_where_size) {
+                in_bindings.popBack();
+            }
+
+            // Try to insert the option.
+            insertOption4(server_selector, in_bindings,
+                          option->getModificationTime());
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. subnet.
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const SubnetID& subnet_id,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        // Create input bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.add(option->option_->getType());
+        addOptionValueBinding(in_bindings, option);
+        in_bindings.addOptional(option->formatted_value_);
+        in_bindings.addOptional(option->space_name_);
+        in_bindings.add(option->persistent_);
+        in_bindings.add(option->cancelled_);
+        in_bindings.addNull();
+        in_bindings.add(subnet_id);
+        in_bindings.add(1);
+        in_bindings.add(option->getContext());
+        in_bindings.addNull();
+        in_bindings.addNull();
+        in_bindings.addTimestamp(option->getModificationTime());
+
+        // Remember the size before we add where clause arguments.
+        size_t pre_where_size = in_bindings.size();
+
+        // Now we add the update where clause parameters
+        in_bindings.add(subnet_id);
+        in_bindings.add(option->option_->getType());
+        in_bindings.addOptional(option->space_name_);
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "subnet specific option set",
+                           cascade_update);
+
+        // Try to update the subnet option.
+        if (updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_SUBNET_ID,
+                              in_bindings) == 0) {
+            // The option doesn't exist, so we'll try to insert it.
+            // Remove the update where clause bindings.
+            while (in_bindings.size() > pre_where_size) {
+                in_bindings.popBack();
+            }
+
+            // Try to insert the option.
+            insertOption4(server_selector, in_bindings,
+                          option->getModificationTime());
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a pool.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool.
+    /// @param pool_end_address Upper bound address of the pool.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const IOAddress& pool_start_address,
+                             const IOAddress& pool_end_address,
+                             const OptionDescriptorPtr& option) {
+        uint64_t pool_id = 0;
+        Pool4Ptr pool = getPool4(server_selector, pool_start_address, pool_end_address,
+                                 pool_id);
+        if (!pool) {
+            isc_throw(BadValue, "no pool found for range of "
+                      << pool_start_address << " : "
+                      << pool_end_address);
+        }
+
+        createUpdateOption4(server_selector, pool_id, option, false);
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a pool.
+    ///
+    /// @param selector Server selector.
+    /// @param pool_id Identifier of the pool the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. subnet.
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const uint64_t pool_id,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        // Create input bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.add(option->option_->getType());
+        addOptionValueBinding(in_bindings, option);
+        in_bindings.addOptional(option->formatted_value_);
+        in_bindings.addOptional(option->space_name_);
+        in_bindings.add(option->persistent_);
+        in_bindings.add(option->cancelled_);
+        in_bindings.addNull();
+        in_bindings.addNull();
+        in_bindings.add(5);
+        in_bindings.add(option->getContext());
+        in_bindings.addNull();
+        in_bindings.add(pool_id);
+        in_bindings.addTimestamp(option->getModificationTime());
+
+        // Remember the size before we add where clause arguments.
+        size_t pre_where_size = in_bindings.size();
+
+        // Now we add the update where clause parameters
+        in_bindings.add(pool_id);
+        in_bindings.add(option->option_->getType());
+        in_bindings.addOptional(option->space_name_);
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "pool specific option set",
+                           cascade_update);
+
+        // Try to update the option.
+        if (updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_POOL_ID,
+                              in_bindings) == 0) {
+            // The option doesn't exist, so we'll try to insert it.
+            // Remove the update where clause bindings.
+            while (in_bindings.size() > pre_where_size) {
+                in_bindings.popBack();
+            }
+
+            // Try to insert the option.
+            insertOption4(server_selector, in_bindings,
+                          option->getModificationTime());
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a shared network.
+    ///
+    /// @param selector Server selector.
+    /// @param shared_network_name Name of the shared network the option
+    /// belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. shared network.
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const std::string& shared_network_name,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        // Create input bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.add(option->option_->getType());
+        addOptionValueBinding(in_bindings, option);
+        in_bindings.addOptional(option->formatted_value_);
+        in_bindings.addOptional(option->space_name_);
+        in_bindings.add(option->persistent_);
+        in_bindings.add(option->cancelled_);
+        in_bindings.addNull();
+        in_bindings.addNull();
+        in_bindings.add(4);
+        in_bindings.add(option->getContext());
+        in_bindings.add(shared_network_name);
+        in_bindings.addNull();
+        in_bindings.addTimestamp(option->getModificationTime());
+
+        // Remember the size before we add where clause arguments.
+        size_t pre_where_size = in_bindings.size();
+
+        // Now we add the update where clause parameters
+        in_bindings.add(shared_network_name);
+        in_bindings.add(option->option_->getType());
+        in_bindings.addOptional(option->space_name_);
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "shared network specific option set",
+                           cascade_update);
+
+        // Try to update the option.
+        if (updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_SHARED_NETWORK,
+                              in_bindings) == 0) {
+            // The option doesn't exist, so we'll try to insert it.
+            // Remove the update where clause bindings.
+            while (in_bindings.size() > pre_where_size) {
+                in_bindings.popBack();
+            }
+
+            // Try to insert the option.
+            insertOption4(server_selector, in_bindings,
+                          option->getModificationTime());
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a client class.
+    ///
+    /// @param selector Server selector.
+    /// @param client_class Pointer to the client_class the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option..
+    void createUpdateOption4(const ServerSelector& server_selector,
+                             const ClientClassDefPtr& client_class,
+                             const OptionDescriptorPtr& option) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        PsqlBindArray in_bindings;
+        std::string class_name = client_class->getName();
+        in_bindings.add(option->option_->getType());
+        addOptionValueBinding(in_bindings, option);
+        in_bindings.addOptional(option->formatted_value_);
+        in_bindings.addOptional(option->space_name_);
+        in_bindings.add(option->persistent_);
+        in_bindings.add(option->cancelled_);
+        in_bindings.add(class_name);
+        in_bindings.addNull();
+        in_bindings.add(2);
+        in_bindings.add(option->getContext());
+        in_bindings.addNull();
+        in_bindings.addNull();
+        in_bindings.addTimestamp(option->getModificationTime());
+
+        // Remember the size before we add where clause arguments.
+        size_t pre_where_size = in_bindings.size();
+
+        // Now we add the update where clause parameters
+        in_bindings.add(class_name);
+        in_bindings.add(option->option_->getType());
+        in_bindings.addOptional(option->space_name_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "client class specific option set",
+                           true);
+
+        if (updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_CLIENT_CLASS,
+                              in_bindings) == 0) {
+            // The option doesn't exist, so we'll try to insert it.
+            // Remove the update where clause bindings.
+            while (in_bindings.size() > pre_where_size) {
+                in_bindings.popBack();
+            }
+
+            insertOption4(server_selector, in_bindings,
+                          option->getModificationTime());
+        }
+    }
+
+    /// @brief Sends query to insert or update option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Pointer to the option definition to be inserted or updated.
+    void createUpdateOptionDef4(const ServerSelector& server_selector,
+                                const OptionDefinitionPtr& option_def) {
+        createUpdateOptionDef(server_selector, Option::V4, option_def, DHCP4_OPTION_SPACE,
+                              PgSqlConfigBackendDHCPv4Impl::GET_OPTION_DEF4_CODE_SPACE,
+                              PgSqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4,
+                              PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION_DEF4,
+                              PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                              PgSqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4_SERVER);
+    }
+
+    /// @brief Sends query to insert or update option definition
+    /// for a client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Pointer to the option definition to be inserted or updated.
+    /// @param client_class Client class name.
+    void createUpdateOptionDef4(const ServerSelector& server_selector,
+                                const OptionDefinitionPtr& option_def,
+                                const std::string& client_class_name) {
+        createUpdateOptionDef(server_selector, Option::V4, option_def, DHCP4_OPTION_SPACE,
+                              PgSqlConfigBackendDHCPv4Impl::GET_OPTION_DEF4_CODE_SPACE,
+                              PgSqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4_CLIENT_CLASS,
+                              PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION_DEF4_CLIENT_CLASS,
+                              PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                              PgSqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4_SERVER,
+                              client_class_name);
+    }
+
+    /// @brief Sends query to delete option definition by code and
+    /// option space name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Option code.
+    /// @param name Option name.
+    /// @return Number of deleted option definitions.
+    uint64_t deleteOptionDef4(const ServerSelector& server_selector,
+                              const uint16_t code,
+                              const std::string& space) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(code);
+        in_bindings.add(space);
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION_DEF4_CODE_NAME,
+                                    server_selector,
+                                    "deleting option definition",
+                                    "option definition deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Sends query to delete option definitions for a client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the client class for which option
+    /// definitions should be deleted.
+    /// @return Number of deleted option definitions.
+    uint64_t deleteOptionDefs4(const ServerSelector& server_selector,
+                               const ClientClassDefPtr& client_class) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(client_class->getName());
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION_DEFS4_CLIENT_CLASS,
+                                    server_selector,
+                                    "deleting option definition for a client class",
+                                    "option definition deleted",
+                                    true,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption4(const ServerSelector& server_selector,
+                           const uint16_t code,
+                           const std::string& space) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(code);
+        in_bindings.add(space);
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION4,
+                                    server_selector,
+                                    "deleting global option",
+                                    "global option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to which deleted option
+    /// belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption4(const ServerSelector& server_selector,
+                           const SubnetID& subnet_id,
+                           const uint16_t code,
+                           const std::string& space) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet_id);
+        in_bindings.add(code);
+        in_bindings.add(space);
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION4_SUBNET_ID,
+                                    server_selector,
+                                    "deleting option for a subnet",
+                                    "subnet specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound pool address.
+    /// @param pool_end_address  Upper bound pool address.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption4(const db::ServerSelector& server_selector,
+                           const IOAddress& pool_start_address,
+                           const IOAddress& pool_end_address,
+                           const uint16_t code,
+                           const std::string& space) {
+        PsqlBindArray in_bindings;
+        in_bindings.addInet4(pool_start_address);
+        in_bindings.addInet4(pool_end_address);
+        in_bindings.add(code);
+        in_bindings.add(space);
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION4_POOL_RANGE,
+                                    server_selector,
+                                    "deleting option for a pool",
+                                    "pool specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network which deleted
+    /// option belongs to
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption4(const db::ServerSelector& server_selector,
+                           const std::string& shared_network_name,
+                           const uint16_t code,
+                           const std::string& space) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(shared_network_name);
+        in_bindings.add(code);
+        in_bindings.add(space);
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION4_SHARED_NETWORK,
+                                    server_selector,
+                                    "deleting option for a shared network",
+                                    "shared network specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a subnet from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet for which options should be
+    /// deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions4(const ServerSelector& server_selector,
+                            const Subnet4Ptr& subnet) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet->getID());
+        in_bindings.addTempString(subnet->toText());
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv4Impl::DELETE_OPTIONS4_SUBNET_ID_PREFIX,
+                                    server_selector,
+                                    "deleting options for a subnet",
+                                    "subnet specific options deleted",
+                                    true, in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a shared network from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet for which options should be
+    /// deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions4(const ServerSelector& server_selector,
+                            const SharedNetwork4Ptr& shared_network) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(shared_network->getName());
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv4Impl::
+                                    DELETE_OPTIONS4_SHARED_NETWORK, server_selector,
+                                    "deleting options for a shared network",
+                                    "shared network specific options deleted",
+                                    true, in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a client class from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the client class for which options
+    /// should be deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions4(const ServerSelector& server_selector,
+                            const ClientClassDefPtr& client_class) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(client_class->getName());
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv4Impl::
+                                    DELETE_OPTIONS4_CLIENT_CLASS, server_selector,
+                                    "deleting options for a client class",
+                                    "client class specific options deleted",
+                                    true, in_bindings));
+    }
+
+    /// @brief Common function to retrieve client classes.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] client_classes Reference to a container where fetched client
+    /// classes will be inserted.
+    void getClientClasses4(const StatementIndex& index,
+                           const ServerSelector& server_selector,
+                           const PsqlBindArray& in_bindings,
+                           ClientClassDictionary& client_classes) {
+        std::list<ClientClassDefPtr> class_list;
+        uint64_t last_option_id = 0;
+        uint64_t last_option_def_id = 0;
+        std::string last_tag;
+
+        selectQuery(index, in_bindings,
+                    [this, &class_list, &last_option_id, &last_option_def_id, &last_tag]
+                    (PgSqlResult& r, int row) {
+            // Create a convenience worker for the row.
+            PgSqlResultRowWorker worker(r, row);
+
+            ClientClassDefPtr last_client_class;
+            if (!class_list.empty()) {
+                last_client_class = *class_list.rbegin();
+            }
+
+            // Class ID is column 0.
+            uint64_t id = worker.getBigInt(0) ;
+
+            if (!last_client_class || (last_client_class->getId() != id)) {
+                last_option_id = 0;
+                last_option_def_id = 0;
+                last_tag.clear();
+
+                auto options = boost::make_shared<CfgOption>();
+                auto option_defs = boost::make_shared<CfgOptionDef>();
+
+                last_client_class = boost::make_shared<ClientClassDef>(worker.getString(1),
+                                                                       ExpressionPtr(), options);
+                last_client_class->setCfgOptionDef(option_defs);
+
+                // id
+                last_client_class->setId(id);
+
+                // name
+                last_client_class->setName(worker.getString(1));
+
+                // test
+                if (!worker.isColumnNull(2)) {
+                    last_client_class->setTest(worker.getString(2));
+                }
+
+                // next server
+                if (!worker.isColumnNull(3)) {
+                    last_client_class->setNextServer(worker.getInet4(3));
+                }
+
+                // sname
+                if (!worker.isColumnNull(4)) {
+                    last_client_class->setSname(worker.getString(4));
+                }
+
+                // filename
+                if (!worker.isColumnNull(5)) {
+                    last_client_class->setFilename(worker.getString(5));
+                }
+
+                // required
+                if (!worker.isColumnNull(6)) {
+                    last_client_class->setRequired(worker.getBool(6));
+                }
+
+                // valid lifetime: default, min, max
+                last_client_class->setValid(worker.getTriplet(7, 8, 9));
+
+                // depend on known directly or indirectly
+                last_client_class->setDependOnKnown(worker.getBool(10) || worker.getBool(11));
+
+                // modification_ts
+                last_client_class->setModificationTime(worker.getTimestamp(12));
+
+                // user_context at 13.
+                if (!worker.isColumnNull(13)) {
+                    ElementPtr user_context = worker.getJSON(13);
+                    if (user_context) {
+                        last_client_class->setContext(user_context);
+                    }
+                }
+
+                // offer_lifetime at 14.
+                if (!worker.isColumnNull(14)) {
+                    last_client_class->setOfferLft(worker.getInt(14));
+                }
+
+                class_list.push_back(last_client_class);
+            }
+
+            // Check for new server tags at 38.
+            if (!worker.isColumnNull(38)) {
+                std::string new_tag = worker.getString(38);
+                if (last_tag != new_tag) {
+                    if (!new_tag.empty() && !last_client_class->hasServerTag(ServerTag(new_tag))) {
+                        last_client_class->setServerTag(new_tag);
+                    }
+
+                    last_tag = new_tag;
+                }
+            }
+
+            // Parse client class specific option definition from 15 to 24.
+            if (!worker.isColumnNull(15) &&
+                (last_option_def_id < worker.getBigInt(15))) {
+                last_option_def_id = worker.getBigInt(15);
+
+                auto def = processOptionDefRow(worker, 15);
+                if (def) {
+                    last_client_class->getCfgOptionDef()->add(def);
+                }
+            }
+
+            // Parse client class specific option from 25 to 37.
+            if (!worker.isColumnNull(25) &&
+                (last_option_id < worker.getBigInt(25))) {
+                last_option_id = worker.getBigInt(25);
+                OptionDescriptorPtr desc = processOptionRow(Option::V4, worker, 25);
+                if (desc) {
+                    last_client_class->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        tossNonMatchingElements(server_selector, class_list);
+
+        for (auto c : class_list) {
+            client_classes.addClass(c);
+        }
+    }
+
+    /// @brief Sends query to retrieve a client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the class to be retrieved.
+    /// @return Pointer to the client class or null if the class is not found.
+    ClientClassDefPtr getClientClass4(const ServerSelector& server_selector,
+                                      const std::string& name) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(name);
+
+        ClientClassDictionary client_classes;
+        getClientClasses4(PgSqlConfigBackendDHCPv4Impl::GET_CLIENT_CLASS4_NAME,
+                          server_selector, in_bindings, client_classes);
+        return (client_classes.getClasses()->empty() ? ClientClassDefPtr() :
+                (*client_classes.getClasses()->begin()));
+    }
+
+    /// @brief Sends query to retrieve all client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] client_classes Reference to the client classes collection
+    /// where retrieved classes will be stored.
+    void getAllClientClasses4(const ServerSelector& server_selector,
+                              ClientClassDictionary& client_classes) {
+        PsqlBindArray in_bindings;
+        getClientClasses4(server_selector.amUnassigned() ?
+                          PgSqlConfigBackendDHCPv4Impl::GET_ALL_CLIENT_CLASSES4_UNASSIGNED :
+                          PgSqlConfigBackendDHCPv4Impl::GET_ALL_CLIENT_CLASSES4,
+                          server_selector, in_bindings, client_classes);
+    }
+
+    /// @brief Sends query to retrieve modified client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] client_classes Reference to the client classes collection
+    /// where retrieved classes will be stored.
+    void getModifiedClientClasses4(const ServerSelector& server_selector,
+                                   const boost::posix_time::ptime& modification_ts,
+                                   ClientClassDictionary& client_classes) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified client classes for ANY "
+                      "server is not supported");
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.addTimestamp(modification_ts);
+        getClientClasses4(server_selector.amUnassigned() ?
+                          PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_CLIENT_CLASSES4_UNASSIGNED :
+                          PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_CLIENT_CLASSES4,
+                          server_selector, in_bindings, client_classes);
+    }
+
+    /// @brief Upserts client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the upserted client class.
+    /// @param follow_class_name name of the class after which the
+    /// new or updated class should be positioned. An empty value
+    /// causes the class to be appended at the end of the class
+    /// hierarchy.
+    void createUpdateClientClass4(const ServerSelector& server_selector,
+                                  const ClientClassDefPtr& client_class,
+                                  const std::string& follow_class_name) {
+        // We need to evaluate class expression to see if it references any
+        // other classes (dependencies). As part of this evaluation we will
+        // also check if the client class depends on KNOWN/UNKNOWN built-in
+        // classes.
+        std::list<std::string> dependencies;
+        auto depend_on_known = false;
+        if (!client_class->getTest().empty()) {
+            ExpressionPtr expression;
+            ExpressionParser parser;
+            // Parse the test expression. The callback function is normally used to
+            // interrupt config file parsing when one of the classes refers to a
+            // non-existing client class. It returns false in this case. Here,
+            // we use the callback to capture client classes referenced by the
+            // upserted client class and record whether this class depends on
+            // KNOWN/UNKNOWN built-ins. The callback always returns true to avoid
+            // reporting the parsing error. The dependency check is performed later
+            // at the database level.
+            parser.parse(expression, Element::create(client_class->getTest()), AF_INET,
+                         [&dependencies, &depend_on_known](const ClientClass& client_class) -> bool {
+                if (isClientClassBuiltIn(client_class)) {
+                    if ((client_class == "KNOWN") || (client_class == "UNKNOWN")) {
+                        depend_on_known = true;
+                    }
+                } else {
+                    dependencies.push_back(client_class);
+                }
+                return (true);
+            });
+        }
+
+        PsqlBindArray in_bindings;
+        std::string class_name = client_class->getName();
+        in_bindings.add(class_name);
+        in_bindings.addTempString(client_class->getTest());
+        in_bindings.addInet4(client_class->getNextServer());
+        in_bindings.addTempString(client_class->getSname());
+        in_bindings.addTempString(client_class->getFilename());
+        in_bindings.add(client_class->getRequired());
+        in_bindings.add(client_class->getValid());
+        in_bindings.add(client_class->getValid().getMin());
+        in_bindings.add(client_class->getValid().getMax());
+        in_bindings.add(depend_on_known);
+
+        // follow-class-name (11)
+        if (follow_class_name.empty()) {
+            in_bindings.addNull();
+        } else {
+            in_bindings.add(follow_class_name);
+        }
+
+        in_bindings.addTimestamp(client_class->getModificationTime());
+        in_bindings.add(client_class->getContext());
+        in_bindings.addOptional(client_class->getOfferLft());
+
+        PgSqlTransaction transaction(conn_);
+
+        ScopedAuditRevision audit_revision(this, PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                                           server_selector, "client class set", true);
+
+        // Create a savepoint in case we are called as part of larger
+        // transaction.
+        conn_.createSavepoint("createUpdateClass4");
+
+        // Keeps track of whether the client class is inserted or updated.
+        auto update = false;
+        try {
+            insertQuery(PgSqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4, in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            // It already exists, rollback to the savepoint to preserve
+            // any prior work.
+            conn_.rollbackToSavepoint("createUpdateClass4");
+
+            // Delete options and option definitions. They will be re-created from the new class
+            // instance.
+            deleteOptions4(ServerSelector::ANY(), client_class);
+            deleteOptionDefs4(ServerSelector::ANY(), client_class);
+
+            // Note: follow_class_name is left in the bindings even though it is
+            // not needed in both cases. This allows us to use one base query.
+
+            // Add the class name for the where clause.
+            in_bindings.add(class_name);
+            if (follow_class_name.empty()) {
+                // If position is not specified, leave the class at the same position.
+                updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::UPDATE_CLIENT_CLASS4_SAME_POSITION,
+                                  in_bindings);
+            } else {
+                // Update with follow_class_name specifying the position.
+                updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::UPDATE_CLIENT_CLASS4,
+                                  in_bindings);
+            }
+
+            // Delete class associations with the servers and dependencies. We will re-create
+            // them according to the new class specification.
+            PsqlBindArray in_assoc_bindings;
+            in_assoc_bindings.add(class_name);
+            updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_DEPENDENCY,
+                              in_assoc_bindings);
+            updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_SERVER,
+                              in_assoc_bindings);
+            update = true;
+        }
+
+        // Associate client class with the servers.
+        PsqlBindArray attach_bindings;
+        attach_bindings.add(class_name);
+        attach_bindings.addTimestamp(client_class->getModificationTime());
+
+        attachElementToServers(PgSqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4_SERVER,
+                               server_selector, attach_bindings);
+
+        // Iterate over the captured dependencies and try to insert them into the database.
+        for (auto dependency : dependencies) {
+            try {
+                PsqlBindArray in_dependency_bindings;
+                in_dependency_bindings.add(class_name);
+                in_dependency_bindings.add(dependency);
+
+                // We deleted earlier dependencies, so we can simply insert new ones.
+                insertQuery(PgSqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4_DEPENDENCY,
+                            in_dependency_bindings);
+            } catch (const std::exception& ex) {
+                isc_throw(InvalidOperation, "unmet dependency on client class: " << dependency);
+            }
+        }
+
+        // If we performed client class update we also have to verify that its dependency
+        // on KNOWN/UNKNOWN client classes hasn't changed.
+        if (update) {
+            PsqlBindArray in_check_bindings;
+            insertQuery(PgSqlConfigBackendDHCPv4Impl::CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+                              in_check_bindings);
+        }
+
+        // (Re)create option definitions.
+        if (client_class->getCfgOptionDef()) {
+            auto option_defs = client_class->getCfgOptionDef()->getContainer();
+            auto option_spaces = option_defs.getOptionSpaceNames();
+            for (auto option_space : option_spaces) {
+                OptionDefContainerPtr defs = option_defs.getItems(option_space);
+                for (auto def = defs->begin(); def != defs->end(); ++def) {
+                    createUpdateOptionDef4(server_selector, *def, client_class->getName());
+                }
+            }
+        }
+
+        // (Re)create options.
+        auto option_spaces = client_class->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = client_class->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption4(server_selector, client_class, desc_copy);
+            }
+        }
+
+        // All ok. Commit the transaction.
+        transaction.commit();
+    }
+
+    /// @brief Removes client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Removed client class name.
+    /// @return Number of deleted client classes.
+    uint64_t deleteClientClass4(const ServerSelector& server_selector,
+                                const std::string& name) {
+        int index = server_selector.amAny() ?
+            PgSqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_ANY :
+            PgSqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4;
+
+        uint64_t result = deleteTransactional(index, server_selector,
+                                              "deleting client class",
+                                              "client class deleted",
+                                              true,
+                                              name);
+        return (result);
+    }
+
+    /// @brief Removes unassigned global parameters, global options and
+    /// option definitions.
+    ///
+    /// This function is called when one or more servers are deleted and
+    /// it is likely that there are some orphaned configuration elements
+    /// left in the database. This method removes those elements.
+    void purgeUnassignedConfig() {
+        multipleUpdateDeleteQueries(DELETE_ALL_GLOBAL_PARAMETERS4_UNASSIGNED,
+                                    DELETE_ALL_GLOBAL_OPTIONS4_UNASSIGNED,
+                                    DELETE_ALL_OPTION_DEFS4_UNASSIGNED);
+    }
+
+    /// @brief Attempts to delete a server having a given tag.
+    ///
+    /// @param server_tag Tag of the server to be deleted.
+    /// @return Number of deleted servers.
+    /// @throw isc::InvalidOperation when trying to delete the logical
+    /// server 'all'.
+    uint64_t deleteServer4(const data::ServerTag& server_tag) {
+        // It is not allowed to delete 'all' logical server.
+        if (server_tag.amAll()) {
+            isc_throw(InvalidOperation, "'all' is a name reserved for the server tag which"
+                      " associates the configuration elements with all servers connecting"
+                      " to the database and may not be deleted");
+        }
+
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this, PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           ServerSelector::ALL(), "deleting a server", false);
+
+        // Specify which server should be deleted.
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(server_tag.get());
+
+        // Attempt to delete the server.
+        auto count = updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::DELETE_SERVER4,
+                                       in_bindings);
+
+        // If we have deleted any servers we have to remove any dangling global
+        // parameters, options and option definitions.
+        if (count > 0) {
+            purgeUnassignedConfig();
+        }
+
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Attempts to delete all servers.
+    ///
+    /// This method deletes all servers added by the user. It does not
+    /// delete the logical server 'all'.
+    ///
+    /// @return Number of deleted servers.
+    uint64_t deleteAllServers4() {
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this, PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                           ServerSelector::ALL(), "deleting all servers",
+                           false);
+
+        // No arguments, hence empty input bindings.
+        PsqlBindArray in_bindings;
+
+        // Attempt to delete the servers.
+        auto count = updateDeleteQuery(PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SERVERS4,
+                                       in_bindings);
+
+        // If we have deleted any servers we have to remove any dangling global
+        // parameters, options and option definitions.
+        if (count > 0) {
+            purgeUnassignedConfig();
+        }
+
+        // Commit the transaction.
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Attempts to reconnect the server to the config DB backend manager.
+    ///
+    /// This is a self-rescheduling function that attempts to reconnect to the
+    /// server's config DB backends after connectivity to one or more have been
+    /// lost. Upon entry it will attempt to reconnect via
+    /// @ref ConfigBackendDHCPv4Mgr.addBackend.
+    /// If this is successful, DHCP servicing is re-enabled and server returns
+    /// to normal operation.
+    ///
+    /// If reconnection fails and the maximum number of retries has not been
+    /// exhausted, it will schedule a call to itself to occur at the
+    /// configured retry interval. DHCP service remains disabled.
+    ///
+    /// If the maximum number of retries has been exhausted an error is logged
+    /// and the server shuts down.
+    ///
+    /// @param db_reconnect_ctl pointer to the ReconnectCtl containing the
+    /// configured reconnect parameters.
+    /// @return true if connection has been recovered, false otherwise.
+    static bool dbReconnect(ReconnectCtlPtr db_reconnect_ctl) {
+        MultiThreadingCriticalSection cs;
+
+        // Invoke application layer connection lost callback.
+        if (!DatabaseConnection::invokeDbLostCallback(db_reconnect_ctl)) {
+            return (false);
+        }
+
+        bool reopened = false;
+
+        const std::string timer_name = db_reconnect_ctl->timerName();
+
+        // At least one connection was lost.
+        try {
+            auto srv_cfg = CfgMgr::instance().getCurrentCfg();
+            auto config_ctl = srv_cfg->getConfigControlInfo();
+            // Iterate over the configured DBs and instantiate them.
+            for (auto db : config_ctl->getConfigDatabases()) {
+                const std::string& access = db.getAccessString();
+                auto parameters = db.getParameters();
+                if (ConfigBackendDHCPv4Mgr::instance().delBackend(parameters["type"], access, true)) {
+                    ConfigBackendDHCPv4Mgr::instance().addBackend(db.getAccessString());
+                }
+            }
+
+            reopened = true;
+        } catch (const std::exception& ex) {
+            LOG_ERROR(pgsql_cb_logger, PGSQL_CB_RECONNECT_ATTEMPT_FAILED4)
+                    .arg(ex.what());
+        }
+
+        if (reopened) {
+            // Cancel the timer.
+            if (TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                TimerMgr::instance()->unregisterTimer(timer_name);
+            }
+
+            // Invoke application layer connection recovered callback.
+            if (!DatabaseConnection::invokeDbRecoveredCallback(db_reconnect_ctl)) {
+                return (false);
+            }
+        } else {
+            if (!db_reconnect_ctl->checkRetries()) {
+                // We're out of retries, log it and initiate shutdown.
+                LOG_ERROR(pgsql_cb_logger, PGSQL_CB_RECONNECT_FAILED4)
+                        .arg(db_reconnect_ctl->maxRetries());
+
+                // Cancel the timer.
+                if (TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                    TimerMgr::instance()->unregisterTimer(timer_name);
+                }
+
+                // Invoke application layer connection failed callback.
+                DatabaseConnection::invokeDbFailedCallback(db_reconnect_ctl);
+
+                return (false);
+            }
+
+            LOG_INFO(pgsql_cb_logger, PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4)
+                    .arg(db_reconnect_ctl->maxRetries() - db_reconnect_ctl->retriesLeft() + 1)
+                    .arg(db_reconnect_ctl->maxRetries())
+                    .arg(db_reconnect_ctl->retryInterval());
+
+            // Start the timer.
+            if (!TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                TimerMgr::instance()->registerTimer(timer_name,
+                    std::bind(&PgSqlConfigBackendDHCPv4Impl::dbReconnect, db_reconnect_ctl),
+                              db_reconnect_ctl->retryInterval(),
+                              asiolink::IntervalTimer::ONE_SHOT);
+            }
+            TimerMgr::instance()->setup(timer_name);
+        }
+
+        return (true);
+    }
+
+};
+
+namespace {
+
+/// @brief Array of tagged statements.
+typedef std::array<PgSqlTaggedStatement, PgSqlConfigBackendDHCPv4Impl::NUM_STATEMENTS>
+TaggedStatementArray;
+
+/// @brief Prepared PgSQL statements used by the backend to insert and
+/// retrieve data from the database. They must be in the same order as
+/// PgSqlConfigBackendDHCPv4Impl::StatementIndex.  The statement is
+/// the corresponding enum name.
+TaggedStatementArray tagged_statements = { {
+    {
+        // PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+        4,
+        {
+            OID_TIMESTAMP,  // 1 audit_ts
+            OID_VARCHAR,    // 2 server_tag
+            OID_TEXT,       // 3 audit_log_message
+            OID_BOOL        // 4 cascade_transaction
+        },
+        "CREATE_AUDIT_REVISION",
+        "select createAuditRevisionDHCP4($1, $2, $3, $4)"
+    },
+
+    // Verify that dependency on KNOWN/UNKNOWN class has not changed.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+        0,
+        {
+            OID_NONE
+        },
+        "CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE",
+        "select checkDHCPv4ClientClassKnownDependencyChange()"
+    },
+
+    // Select global parameter by name.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_GLOBAL_PARAMETER4,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR     // 2 name
+        },
+        "GET_GLOBAL_PARAMETER4",
+        PGSQL_GET_GLOBAL_PARAMETER(dhcp4, AND g.name = $2)
+    },
+
+    // Select all global parameters.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_ALL_GLOBAL_PARAMETERS4,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "GET_ALL_GLOBAL_PARAMETERS4",
+        PGSQL_GET_GLOBAL_PARAMETER(dhcp4)
+    },
+
+    // Select modified global parameters.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_GLOBAL_PARAMETERS4,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_TIMESTAMP   // 2 modification_ts
+        },
+        "GET_MODIFIED_GLOBAL_PARAMETERS4",
+        PGSQL_GET_GLOBAL_PARAMETER(dhcp4, AND g.modification_ts >= $2)
+    },
+
+    // Select subnet by id.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_SUBNET4_ID_NO_TAG,
+        1,
+        {
+            OID_INT8    // 1 subnet_id
+        },
+        "GET_SUBNET4_ID_NO_TAG",
+        PGSQL_GET_SUBNET4_NO_TAG(WHERE s.subnet_id = $1)
+    },
+
+    // Select subnet by id without specifying server tags.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_SUBNET4_ID_ANY,
+        1,
+        {
+            OID_INT8    // 1 subnet_id
+        },
+        "GET_SUBNET4_ID_ANY",
+        PGSQL_GET_SUBNET4_ANY(WHERE s.subnet_id = $1)
+    },
+
+    // Select unassigned subnet by id.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_SUBNET4_ID_UNASSIGNED,
+        1,
+        {
+            OID_INT8    // 1 subnet_id
+        },
+        "GET_SUBNET4_ID_UNASSIGNED",
+        PGSQL_GET_SUBNET4_UNASSIGNED(AND s.subnet_id = $1)
+    },
+
+    // Select subnet by prefix.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_SUBNET4_PREFIX_NO_TAG,
+        1,
+        {
+            OID_VARCHAR // 1 subnet_prefix
+        },
+        "GET_SUBNET4_PREFIX_NO_TAG",
+        PGSQL_GET_SUBNET4_NO_TAG(WHERE s.subnet_prefix = $1)
+    },
+
+    // Select subnet by prefix without specifying server tags.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_SUBNET4_PREFIX_ANY,
+        1,
+        {
+            OID_VARCHAR // 1 subnet_prefix
+        },
+        "GET_SUBNET4_PREFIX_ANY",
+        PGSQL_GET_SUBNET4_ANY(WHERE s.subnet_prefix = $1)
+    },
+
+    // Select unassigned subnet by prefix.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_SUBNET4_PREFIX_UNASSIGNED,
+        1,
+        {
+            OID_VARCHAR // 1 subnet_prefix
+        },
+        "GET_SUBNET4_PREFIX_UNASSIGNED",
+        PGSQL_GET_SUBNET4_UNASSIGNED(AND s.subnet_prefix = $1)
+    },
+
+    // Select all subnets.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_ALL_SUBNETS4,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_SUBNETS4",
+        PGSQL_GET_SUBNET4_NO_TAG()
+    },
+
+    // Select all unassigned subnets.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_ALL_SUBNETS4_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_SUBNETS4_UNASSIGNED",
+        PGSQL_GET_SUBNET4_UNASSIGNED()
+    },
+
+    // Select subnets having modification time later than X.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_SUBNETS4,
+        1,
+        {
+            OID_TIMESTAMP // 1 modification_ts
+        },
+        "GET_MODIFIED_SUBNETS4",
+        PGSQL_GET_SUBNET4_NO_TAG(WHERE s.modification_ts >= $1)
+    },
+
+    // Select modified and unassigned subnets.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_SUBNETS4_UNASSIGNED,
+        1,
+        {
+            OID_TIMESTAMP // 1 modification_ts
+        },
+        "GET_MODIFIED_SUBNETS4_UNASSIGNED",
+        PGSQL_GET_SUBNET4_UNASSIGNED(AND s.modification_ts >= $1)
+    },
+
+    // Select subnets belonging to a shared network.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_SHARED_NETWORK_SUBNETS4,
+        1,
+        {
+            OID_VARCHAR // 1 share_network_name
+        },
+        "GET_SHARED_NETWORK_SUBNETS4",
+        PGSQL_GET_SUBNET4_ANY(WHERE s.shared_network_name = $1)
+    },
+
+    // Select pool by address range for a server.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_POOL4_RANGE,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_TEXT,       // 2 start_address - cast as inet
+            OID_TEXT        // 3 end_address - cast as inet
+        },
+        "GET_POOL4_RANGE",
+        PGSQL_GET_POOL4_RANGE_WITH_TAG(WHERE (srv.tag = $1 OR srv.id = 1) \
+                                       AND (p.start_address = cast($2 as inet)) \
+                                       AND (p.end_address = cast($3 as inet)))
+    },
+
+    // Select pool by address range for any server.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_POOL4_RANGE_ANY,
+        2,
+        {
+            OID_TEXT,       // 1 start_address - cast as inet
+            OID_TEXT        // 2 end_address - cast as inet
+        },
+        "GET_POOL4_RANGE_ANY",
+        PGSQL_GET_POOL4_RANGE_NO_TAG(WHERE (p.start_address = cast($1 as inet)) AND \
+                                           (p.end_address = cast($2 as inet)))
+    },
+
+    // Select shared network by name.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_SHARED_NETWORK4_NAME_NO_TAG,
+        1,
+        {
+            OID_VARCHAR // name of network
+        },
+        "GET_SHARED_NETWORK4_NAME_NO_TAG",
+        PGSQL_GET_SHARED_NETWORK4_NO_TAG(WHERE n.name = $1)
+    },
+
+    // Select shared network by name without specifying server tags.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_SHARED_NETWORK4_NAME_ANY,
+        1,
+        {
+            OID_VARCHAR // name of network
+        },
+        "GET_SHARED_NETWORK4_NAME_ANY",
+        PGSQL_GET_SHARED_NETWORK4_ANY(WHERE n.name = $1)
+    },
+
+    // Select unassigned shared network by name.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_SHARED_NETWORK4_NAME_UNASSIGNED,
+        1,
+        {
+            OID_VARCHAR // name of network
+        },
+        "GET_SHARED_NETWORK4_NAME_UNASSIGNED",
+        PGSQL_GET_SHARED_NETWORK4_UNASSIGNED(AND n.name = $1)
+    },
+
+    // Select all shared networks.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_ALL_SHARED_NETWORKS4,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_SHARED_NETWORKS4",
+        PGSQL_GET_SHARED_NETWORK4_NO_TAG()
+    },
+
+    // Select all unassigned shared networks.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_ALL_SHARED_NETWORKS4_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_SHARED_NETWORKS4_UNASSIGNED",
+        PGSQL_GET_SHARED_NETWORK4_UNASSIGNED()
+    },
+
+    // Select modified shared networks.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_SHARED_NETWORKS4,
+        1,
+        {
+            OID_TIMESTAMP  // 1 modification_ts
+        },
+        "GET_MODIFIED_SHARED_NETWORKS4",
+        PGSQL_GET_SHARED_NETWORK4_NO_TAG(WHERE n.modification_ts >= $1)
+    },
+
+    // Select modified and unassigned shared networks.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_SHARED_NETWORKS4_UNASSIGNED,
+        1,
+        {
+            OID_TIMESTAMP  // 1 modification_ts
+        },
+        "GET_MODIFIED_SHARED_NETWORKS4_UNASSIGNED",
+        PGSQL_GET_SHARED_NETWORK4_UNASSIGNED(AND n.modification_ts >= $1)
+    },
+
+    // Retrieves option definition by code and space.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_OPTION_DEF4_CODE_SPACE,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT2,       // 2 code
+            OID_VARCHAR     // 3 space
+        },
+        "GET_OPTION_DEF4_CODE_SPACE",
+        PGSQL_GET_OPTION_DEF(dhcp4, AND d.code = $2 AND d.space = $3)
+    },
+
+    // Retrieves all option definitions.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_ALL_OPTION_DEFS4,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "GET_ALL_OPTION_DEFS4",
+        PGSQL_GET_OPTION_DEF(dhcp4)
+    },
+
+    // Retrieves modified option definitions.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_OPTION_DEFS4,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_TIMESTAMP   // 2 modification_ts
+        },
+        "GET_MODIFIED_OPTION_DEFS4",
+        PGSQL_GET_OPTION_DEF(dhcp4, AND d.modification_ts >= $2)
+    },
+
+    // Retrieves global option by code and space.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_OPTION4_CODE_SPACE,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT2,       // 2 code
+            OID_VARCHAR     // 3 space
+        },
+        "GET_OPTION4_CODE_SPACE",
+        PGSQL_GET_OPTION4(AND o.scope_id = 0 AND o.code = $2 AND o.space = $3)
+    },
+
+    // Retrieves all global options.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_ALL_OPTIONS4,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "GET_ALL_OPTIONS4",
+        PGSQL_GET_OPTION4(AND o.scope_id = 0)
+    },
+
+    // Retrieves modified options.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_OPTIONS4,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_TIMESTAMP   // 2 modification_ts
+        },
+        "GET_MODIFIED_OPTIONS4",
+        PGSQL_GET_OPTION4(AND o.scope_id = 0 AND o.modification_ts >= $2)
+    },
+
+    // Retrieves an option for a given subnet, option code and space.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_OPTION4_SUBNET_ID_CODE_SPACE,
+        4,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT8,       // 2 subnet_id
+            OID_INT2,       // 3 code
+            OID_VARCHAR     // 4 space
+        },
+        "GET_OPTION4_SUBNET_ID_CODE_SPACE",
+        PGSQL_GET_OPTION4(AND o.scope_id = 1 AND o.dhcp4_subnet_id = $2 AND o.code = $3 AND o.space = $4)
+    },
+
+    // Retrieves an option for a given pool, option code and space.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_OPTION4_POOL_ID_CODE_SPACE,
+        4,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT8,       // 2 pool_id
+            OID_INT2,       // 3 code
+            OID_VARCHAR     // 4 space
+        },
+        "GET_OPTION4_POOL_ID_CODE_SPACE",
+        PGSQL_GET_OPTION4(AND o.scope_id = 5 AND o.pool_id = $2 AND o.code = $3 AND o.space = $4)
+    },
+
+    // Retrieves an option for a given shared network, option code and space.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_OPTION4_SHARED_NETWORK_CODE_SPACE,
+        4,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR,    // 2 shared_network_name
+            OID_INT2,       // 3 code
+            OID_VARCHAR     // 4 space
+        },
+        "GET_OPTION4_SHARED_NETWORK_CODE_SPACE",
+        PGSQL_GET_OPTION4(AND o.scope_id = 4 AND o.shared_network_name = $2 AND o.code = $3 AND o.space = $4)
+    },
+
+    // Select a client class by name.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_CLIENT_CLASS4_NAME,
+        1,
+        {
+            OID_VARCHAR // name of class
+        },
+        "GET_CLIENT_CLASS4_NAME",
+        PGSQL_GET_CLIENT_CLASS4_WITH_TAG(WHERE c.name = $1)
+    },
+
+    // Select all client classes.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_ALL_CLIENT_CLASSES4,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_CLIENT_CLASSES4",
+        PGSQL_GET_CLIENT_CLASS4_WITH_TAG()
+    },
+
+    // Select all unassigned client classes.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_ALL_CLIENT_CLASSES4_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_CLIENT_CLASSES4_UNASSIGNED",
+        PGSQL_GET_CLIENT_CLASS4_UNASSIGNED()
+    },
+
+    // Select modified client classes.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_CLIENT_CLASSES4,
+        1,
+        {
+            OID_TIMESTAMP // 1 modification_ts
+        },
+        "GET_MODIFIED_CLIENT_CLASSES4",
+        PGSQL_GET_CLIENT_CLASS4_WITH_TAG(WHERE c.modification_ts >= $1)
+    },
+
+    // Select modified client classes.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_CLIENT_CLASSES4_UNASSIGNED,
+        1,
+        {
+            OID_TIMESTAMP // 1 modification_ts
+        },
+        "GET_MODIFIED_CLIENT_CLASSES4_UNASSIGNED",
+        PGSQL_GET_CLIENT_CLASS4_UNASSIGNED(AND c.modification_ts >= $1)
+    },
+
+    // Retrieves the most recent audit entries.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_AUDIT_ENTRIES4_TIME,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_INT8        // 3 revision id
+        },
+        "GET_AUDIT_ENTRIES4_TIME",
+        PGSQL_GET_AUDIT_ENTRIES_TIME(dhcp4)
+    },
+
+    // Retrieves a server by tag.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_SERVER4,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "GET_SERVER4",
+        PGSQL_GET_SERVER(dhcp4)
+    },
+
+    // Retrieves all servers.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_ALL_SERVERS4,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_SERVERS4",
+        PGSQL_GET_ALL_SERVERS(dhcp4)
+    },
+
+    // Insert global parameter.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_GLOBAL_PARAMETER4,
+        4,
+        {
+            OID_VARCHAR,    // 1 name
+            OID_TEXT,       // 2 value
+            OID_INT2,       // 3 parameter_type
+            OID_TIMESTAMP   // 4 modification_ts
+        },
+        "INSERT_GLOBAL_PARAMETER4",
+        PGSQL_INSERT_GLOBAL_PARAMETER(dhcp4)
+    },
+
+    // Insert association of the global parameter with a server.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_GLOBAL_PARAMETER4_SERVER,
+        3,
+        {
+            OID_INT8,       // 1 parameter_id
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_GLOBAL_PARAMETER4_SERVER",
+        PGSQL_INSERT_GLOBAL_PARAMETER_SERVER(dhcp4)
+    },
+
+    // Insert a subnet.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_SUBNET4,
+        38,
+        {
+            OID_INT8,       //  1 subnet_id,
+            OID_VARCHAR,    //  2 subnet_prefix
+            OID_VARCHAR,    //  3 interface_4o6
+            OID_VARCHAR,    //  4 interface_id_4o6
+            OID_VARCHAR,    //  5 subnet_4o6
+            OID_VARCHAR,    //  6 boot_file_name
+            OID_VARCHAR,    //  7 client_class
+            OID_VARCHAR,    //  8 interface
+            OID_BOOL,       //  9 match_client_id
+            OID_TIMESTAMP,  // 10 modification_ts
+            OID_TEXT,       // 11 next_server - cast as inet
+            OID_INT8,       // 12 rebind_timer
+            OID_TEXT,       // 13 relay
+            OID_INT8,       // 14 renew_timer
+            OID_TEXT,       // 15 require_client_classes
+            OID_BOOL,       // 16 reservations_global
+            OID_VARCHAR,    // 17 server_hostname
+            OID_VARCHAR,    // 18 shared_network_name
+            OID_TEXT,       // 19 user_context
+            OID_INT8,       // 20 valid_lifetime
+            OID_INT8,       // 21 min_valid_lifetime
+            OID_INT8,       // 22 max_valid_lifetime
+            OID_BOOL,       // 23 calculate_tee_times
+            OID_TEXT,       // 24 t1_percent - cast as float
+            OID_TEXT,       // 25 t2_percent - cast as float
+            OID_BOOL,       // 26 authoritative
+            OID_BOOL,       // 27 ddns_send_updates
+            OID_BOOL,       // 28 ddns_override_no_update
+            OID_BOOL,       // 29 ddns_override_client_update
+            OID_INT8,       // 30 ddns_replace_client_name
+            OID_VARCHAR,    // 31 ddns_generated_prefix
+            OID_VARCHAR,    // 32 ddns_qualifying_suffix
+            OID_BOOL,       // 33 reservations_in_subnet
+            OID_BOOL,       // 34 reservations_out_of_pool
+            OID_TEXT,       // 35 cache_threshold - cast as float
+            OID_INT8,       // 36 cache_max_age
+            OID_INT8,       // 37 offer_lifetime
+            OID_VARCHAR     // 38 allocator
+        },
+        "INSERT_SUBNET4",
+        "INSERT INTO dhcp4_subnet("
+        "  subnet_id,"
+        "  subnet_prefix,"
+        "  interface_4o6,"
+        "  interface_id_4o6,"
+        "  subnet_4o6,"
+        "  boot_file_name,"
+        "  client_class,"
+        "  interface,"
+        "  match_client_id,"
+        "  modification_ts,"
+        "  next_server,"
+        "  rebind_timer,"
+        "  relay,"
+        "  renew_timer,"
+        "  require_client_classes,"
+        "  reservations_global,"
+        "  server_hostname,"
+        "  shared_network_name,"
+        "  user_context,"
+        "  valid_lifetime,"
+        "  min_valid_lifetime,"
+        "  max_valid_lifetime,"
+        "  calculate_tee_times,"
+        "  t1_percent,"
+        "  t2_percent,"
+        "  authoritative,"
+        "  ddns_send_updates,"
+        "  ddns_override_no_update,"
+        "  ddns_override_client_update,"
+        "  ddns_replace_client_name,"
+        "  ddns_generated_prefix,"
+        "  ddns_qualifying_suffix,"
+        "  reservations_in_subnet,"
+        "  reservations_out_of_pool,"
+        "  cache_threshold,"
+        "  cache_max_age,"
+        "  offer_lifetime,"
+        "  allocator"
+        ") VALUES ("
+            "$1, $2, $3, $4, $5, $6, $7, $8, $9, $10, "
+            "cast($11 as inet), $12, $13, $14, $15, $16, $17, $18, cast($19 as json), $20, "
+            "$21, $22, $23, cast($24 as float), cast($25 as float), $26, $27, $28, $29, $30, "
+            "$31, $32, $33, $34, cast($35 as float), $36, $37, $38"
+        ")"
+    },
+
+    // Insert association of the subnet with a server.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_SUBNET4_SERVER,
+        3,
+        {
+            OID_INT8,       // 1 subnet_id
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_SUBNET4_SERVER",
+        PGSQL_INSERT_SUBNET_SERVER(dhcp4)
+    },
+
+    // Insert pool for a subnet.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_POOL4,
+        7,
+        {
+            OID_TEXT,       // 1 start_address - cast as inet
+            OID_TEXT,       // 2 end_address - cast as inet
+            OID_INT8,       // 3 subnet_id
+            OID_VARCHAR,    // 4 client_class
+            OID_TEXT,       // 5 require_client_classes
+            OID_TEXT,       // 6 user_context - cast as json
+            OID_TIMESTAMP   // 7 modification_ts
+        },
+        "INSERT_POOL4",
+        PGSQL_INSERT_POOL(dhcp4)
+    },
+
+    // Insert a shared network.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_SHARED_NETWORK4,
+        33,
+        {
+            OID_VARCHAR,    //  1 name,
+            OID_VARCHAR,    //  2 client_class,
+            OID_VARCHAR,    //  3 interface,
+            OID_BOOL,       //  4 match_client_id,
+            OID_TIMESTAMP,  //  5 modification_ts,
+            OID_INT8,       //  6 rebind_timer,
+            OID_TEXT,       //  7 relay,
+            OID_INT8,       //  8 renew_timer,
+            OID_TEXT,       //  9 require_client_classes,
+            OID_BOOL,       // 10 reservations_global,
+            OID_TEXT,       // 11 user_context,
+            OID_INT8,       // 12 valid_lifetime,
+            OID_INT8,       // 13 min_valid_lifetime,
+            OID_INT8,       // 14 max_valid_lifetime,
+            OID_BOOL,       // 15 calculate_tee_times,
+            OID_TEXT,       // 16 t1_percent - cast as float
+            OID_TEXT,       // 17 t2_percent - cast as float
+            OID_BOOL,       // 18 authoritative,
+            OID_VARCHAR,    // 19 boot_file_name,
+            OID_TEXT,       // 20 next_server - cast as inet
+            OID_VARCHAR,    // 21 server_hostname,
+            OID_BOOL,       // 22 ddns_send_updates,
+            OID_BOOL,       // 23 ddns_override_no_update,
+            OID_BOOL,       // 24 ddns_override_client_update,
+            OID_INT8,       // 25 ddns_replace_client_name,
+            OID_VARCHAR,    // 26 ddns_generated_prefix,
+            OID_VARCHAR,    // 27 ddns_qualifying_suffix,
+            OID_BOOL,       // 28 reservations_in_subnet,
+            OID_BOOL,       // 29 reservations_out_of_pool,
+            OID_TEXT,       // 30 cache_threshold - cast as float
+            OID_INT8,       // 31 cache_max_age
+            OID_INT8,       // 32 offer_lifetime
+            OID_VARCHAR     // 33 allocator
+        },
+        "INSERT_SHARED_NETWORK4",
+        "INSERT INTO dhcp4_shared_network("
+        "  name,"
+        "  client_class,"
+        "  interface,"
+        "  match_client_id,"
+        "  modification_ts,"
+        "  rebind_timer,"
+        "  relay,"
+        "  renew_timer,"
+        "  require_client_classes,"
+        "  reservations_global,"
+        "  user_context,"
+        "  valid_lifetime,"
+        "  min_valid_lifetime,"
+        "  max_valid_lifetime,"
+        "  calculate_tee_times,"
+        "  t1_percent,"
+        "  t2_percent,"
+        "  authoritative,"
+        "  boot_file_name,"
+        "  next_server,"
+        "  server_hostname,"
+        "  ddns_send_updates,"
+        "  ddns_override_no_update,"
+        "  ddns_override_client_update,"
+        "  ddns_replace_client_name,"
+        "  ddns_generated_prefix,"
+        "  ddns_qualifying_suffix,"
+        "  reservations_in_subnet,"
+        "  reservations_out_of_pool,"
+        "  cache_threshold,"
+        "  cache_max_age,"
+        "  offer_lifetime,"
+        "  allocator"
+        ") VALUES ("
+            "$1, $2, $3, $4, $5, $6, $7, $8, $9, $10,"
+            "cast($11 as json), $12, $13, $14, $15, "
+            "cast($16 as float), cast($17 as float), $18, $19, cast($20 as inet), "
+            "$21, $22, $23, $24, $25, $26, $27, $28, $29, cast($30 as float), $31, $32, $33"
+        ")"
+    },
+
+    // Insert association of the shared network with a server.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_SHARED_NETWORK4_SERVER,
+        3,
+        {
+            OID_VARCHAR,    // 1 shared_network_name
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_SHARED_NETWORK4_SERVER",
+        PGSQL_INSERT_SHARED_NETWORK_SERVER(dhcp4)
+    },
+
+    // Insert option definition.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4,
+        10,
+        {
+            OID_INT2,       //  1 code
+            OID_VARCHAR,    //  2 name
+            OID_VARCHAR,    //  3 space
+            OID_INT2,       //  4 type
+            OID_TIMESTAMP,  //  5 modification_ts
+            OID_BOOL,       //  6 is_array
+            OID_VARCHAR,    //  7 encapsulate
+            OID_VARCHAR,    //  8 record_types
+            OID_VARCHAR,    //  9 user_context
+            OID_INT8        // 10 class_id
+        },
+        "INSERT_OPTION_DEF4",
+        PGSQL_INSERT_OPTION_DEF(dhcp4)
+    },
+
+    // Insert option definition for client class.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4_CLIENT_CLASS,
+        10,
+        {
+            OID_INT2,       //  1 code
+            OID_VARCHAR,    //  2 name
+            OID_VARCHAR,    //  3 space
+            OID_INT2,       //  4 type
+            OID_TIMESTAMP,  //  5 modification_ts
+            OID_BOOL,       //  6 is_array
+            OID_VARCHAR,    //  7 encapsulate
+            OID_VARCHAR,    //  8 record_types
+            OID_VARCHAR,    //  9 user_context
+            OID_VARCHAR     // 10 class name for where clause
+        },
+        "INSERT_OPTION_DEF4_CLIENT_CLASS",
+        PGSQL_INSERT_OPTION_DEF_CLIENT_CLASS(dhcp4)
+    },
+
+    // Insert association of the option definition with a server.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_OPTION_DEF4_SERVER,
+        3,
+        {
+            OID_INT8,       // 1 option_def_id
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_OPTION_DEF4_SERVER",
+        PGSQL_INSERT_OPTION_DEF_SERVER(dhcp4)
+    },
+
+    // Insert subnet specific option.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_OPTION4,
+        13,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp4_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP   // 13 modification_ts
+        },
+        "INSERT_OPTION4",
+        PGSQL_INSERT_OPTION4()
+    },
+
+    // Insert association of the DHCP option with a server.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_OPTION4_SERVER,
+        3,
+        {
+            OID_INT8,       // 1 option_id
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_OPTION4_SERVER",
+        PGSQL_INSERT_OPTION_SERVER(dhcp4)
+    },
+
+    // Insert client class.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4,
+        14,
+        {
+            OID_VARCHAR,    //  1 name
+            OID_TEXT,       //  2 test
+            OID_TEXT,       //  3 next_server - cast as inet
+            OID_VARCHAR,    //  4 server_hostname
+            OID_VARCHAR,    //  5 boot_file_name
+            OID_BOOL,       //  6 only_if_required
+            OID_INT8,       //  7 valid_lifetime
+            OID_INT8,       //  8 min_valid_lifetime
+            OID_INT8,       //  9 max_valid_lifetime
+            OID_BOOL,       // 10 depend_on_known_directly
+            OID_VARCHAR,    // 11 follow_class_name
+            OID_TIMESTAMP,  // 12 modification_ts
+            OID_TEXT,       // 13 user_context cast as JSON
+            OID_INT8        //  14 offer_lifetime
+        },
+        "INSERT_CLIENT_CLASS4",
+        "INSERT INTO dhcp4_client_class("
+        "  name,"
+        "  test,"
+        "  next_server,"
+        "  server_hostname,"
+        "  boot_file_name,"
+        "  only_if_required,"
+        "  valid_lifetime,"
+        "  min_valid_lifetime,"
+        "  max_valid_lifetime,"
+        "  depend_on_known_directly,"
+        "  follow_class_name,"
+        "  modification_ts, "
+        "  user_context, "
+        "  offer_lifetime "
+        ") VALUES ("
+            "$1, $2, cast($3 as inet), $4, $5, $6, $7, $8, $9, $10, $11, $12, cast($13 as JSON), $14"
+        ")"
+    },
+
+    // Insert association of a client class with a server.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4_SERVER,
+        3,
+        {
+            OID_VARCHAR,    // 1 class_name
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_CLIENT_CLASS4_SERVER",
+        PGSQL_INSERT_CLIENT_CLASS_SERVER(dhcp4)
+    },
+
+    // Insert client class dependency.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_CLIENT_CLASS4_DEPENDENCY,
+        2,
+        {
+            OID_VARCHAR,    // class name
+            OID_VARCHAR     // dependency class name
+        },
+        "INSERT_CLIENT_CLASS4_DEPENDENCY",
+        PGSQL_INSERT_CLIENT_CLASS_DEPENDENCY(dhcp4)
+    },
+
+    // Insert server with server tag and description.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::INSERT_SERVER4,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR,    // 2 description
+            OID_TIMESTAMP   // 3 modification_ts
+        },
+        "INSERT_SERVER4",
+        PGSQL_INSERT_SERVER(dhcp4)
+    },
+
+    // Update existing global parameter.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_GLOBAL_PARAMETER4,
+        6,
+        {
+            OID_VARCHAR,    // 1 name
+            OID_TEXT,       // 2 value
+            OID_INT2,       // 3 parameter_type
+            OID_TIMESTAMP,  // 4 modification_ts
+            OID_VARCHAR,    // 5 server_tag
+            OID_VARCHAR,    // 6 name (of global to update)
+        },
+        "UPDATE_GLOBAL_PARAMETER4",
+        PGSQL_UPDATE_GLOBAL_PARAMETER(dhcp4)
+    },
+
+    // Update existing subnet.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_SUBNET4,
+        40,
+        {
+            OID_INT8,       //  1 subnet_id,
+            OID_VARCHAR,    //  2 subnet_prefix
+            OID_VARCHAR,    //  3 interface_4o6
+            OID_VARCHAR,    //  4 interface_id_4o6
+            OID_VARCHAR,    //  5 subnet_4o6
+            OID_VARCHAR,    //  6 boot_file_name
+            OID_VARCHAR,    //  7 client_class
+            OID_VARCHAR,    //  8 interface
+            OID_BOOL,       //  9 match_client_id
+            OID_TIMESTAMP,  // 10 modification_ts
+            OID_TEXT,       // 11 next_server - cast as inet
+            OID_INT8,       // 12 rebind_timer
+            OID_TEXT,       // 13 relay
+            OID_INT8,       // 14 renew_timer
+            OID_TEXT,       // 15 require_client_classes
+            OID_BOOL,       // 16 reservations_global
+            OID_VARCHAR,    // 17 server_hostname
+            OID_VARCHAR,    // 18 shared_network_name
+            OID_TEXT,       // 19 user_context
+            OID_INT8,       // 20 valid_lifetime
+            OID_INT8,       // 21 min_valid_lifetime
+            OID_INT8,       // 22 max_valid_lifetime
+            OID_BOOL,       // 23 calculate_tee_times
+            OID_TEXT,       // 24 t1_percent - cast as float
+            OID_TEXT,       // 25 t2_percent - cast as float
+            OID_BOOL,       // 26 authoritative
+            OID_BOOL,       // 27 ddns_send_updates
+            OID_BOOL,       // 28 ddns_override_no_update
+            OID_BOOL,       // 29 ddns_override_client_update
+            OID_INT8,       // 30 ddns_replace_client_name
+            OID_VARCHAR,    // 31 ddns_generated_prefix
+            OID_VARCHAR,    // 32 ddns_qualifying_suffix
+            OID_BOOL,       // 33 reservations_in_subnet
+            OID_BOOL,       // 34 reservations_out_of_pool
+            OID_TEXT,       // 35 cache_threshold - cast as float
+            OID_INT8,       // 36 cache_max_age"
+            OID_INT8,       // 37 offer_lifetime"
+            OID_VARCHAR,    // 38 allocator
+            OID_INT8,       // 39 subnet_id (of subnet to update)
+            OID_VARCHAR,    // 40 subnet_prefix (of subnet to update)
+        },
+        "UPDATE_SUBNET4,",
+        "UPDATE dhcp4_subnet SET"
+        "  subnet_id = $1,"
+        "  subnet_prefix = $2,"
+        "  interface_4o6 = $3,"
+        "  interface_id_4o6 = $4,"
+        "  subnet_4o6 = $5,"
+        "  boot_file_name = $6,"
+        "  client_class = $7,"
+        "  interface = $8,"
+        "  match_client_id = $9,"
+        "  modification_ts = $10,"
+        "  next_server = cast($11 as inet),"
+        "  rebind_timer = $12,"
+        "  relay = $13,"
+        "  renew_timer = $14,"
+        "  require_client_classes = $15,"
+        "  reservations_global = $16,"
+        "  server_hostname = $17,"
+        "  shared_network_name = $18,"
+        "  user_context = cast($19 as json),"
+        "  valid_lifetime = $20,"
+        "  min_valid_lifetime = $21,"
+        "  max_valid_lifetime = $22,"
+        "  calculate_tee_times = $23,"
+        "  t1_percent = cast($24 as float),"
+        "  t2_percent = cast($25 as float),"
+        "  authoritative = $26,"
+        "  ddns_send_updates = $27,"
+        "  ddns_override_no_update = $28,"
+        "  ddns_override_client_update = $29,"
+        "  ddns_replace_client_name = $30,"
+        "  ddns_generated_prefix = $31,"
+        "  ddns_qualifying_suffix = $32,"
+        "  reservations_in_subnet = $33,"
+        "  reservations_out_of_pool = $34,"
+        "  cache_threshold = cast($35 as float),"
+        "  cache_max_age = $36,"
+        "  offer_lifetime = $37,"
+        "  allocator = $38 "
+        "WHERE subnet_id = $39 OR subnet_prefix = $40"
+    },
+
+    // Update existing shared network.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_SHARED_NETWORK4,
+        34,
+        {
+            OID_VARCHAR,    //  1 name,
+            OID_VARCHAR,    //  2 client_class,
+            OID_VARCHAR,    //  3 interface,
+            OID_BOOL,       //  4 match_client_id,
+            OID_TIMESTAMP,  //  5 modification_ts,
+            OID_INT8,       //  6 rebind_timer,
+            OID_TEXT,       //  7 relay,
+            OID_INT8,       //  8 renew_timer,
+            OID_TEXT,       //  9 require_client_classes,
+            OID_BOOL,       // 10 reservations_global,
+            OID_TEXT,       // 11 user_context,
+            OID_INT8,       // 12 valid_lifetime,
+            OID_INT8,       // 13 min_valid_lifetime,
+            OID_INT8,       // 14 max_valid_lifetime,
+            OID_BOOL,       // 15 calculate_tee_times,
+            OID_TEXT,       // 16 t1_percent - cast as float
+            OID_TEXT,       // 17 t2_percent - cast as float
+            OID_BOOL,       // 18 authoritative,
+            OID_VARCHAR,    // 19 boot_file_name,
+            OID_TEXT,       // 20 next_server - cast as inet
+            OID_VARCHAR,    // 21 server_hostname,
+            OID_BOOL,       // 22 ddns_send_updates,
+            OID_BOOL,       // 23 ddns_override_no_update,
+            OID_BOOL,       // 24 ddns_override_client_update,
+            OID_INT8,       // 25 ddns_replace_client_name,
+            OID_VARCHAR,    // 26 ddns_generated_prefix,
+            OID_VARCHAR,    // 27 ddns_qualifying_suffix,
+            OID_BOOL,       // 28 reservations_in_subnet,
+            OID_BOOL,       // 29 reservations_out_of_pool,
+            OID_TEXT,       // 30 cache_threshold - cast as float
+            OID_INT8,       // 31 cache_max_age
+            OID_INT8,       // 32 offer_lifetime
+            OID_VARCHAR,    // 33 name (of network to update)
+            OID_VARCHAR     // 34 allocator
+        },
+        "UPDATE_SHARED_NETWORK4",
+        "UPDATE dhcp4_shared_network SET"
+        "  name = $1,"
+        "  client_class = $2,"
+        "  interface = $3,"
+        "  match_client_id = $4,"
+        "  modification_ts = $5,"
+        "  rebind_timer = $6,"
+        "  relay = $7,"
+        "  renew_timer = $8,"
+        "  require_client_classes = $9,"
+        "  reservations_global = $10,"
+        "  user_context = cast($11 as json),"
+        "  valid_lifetime = $12,"
+        "  min_valid_lifetime = $13,"
+        "  max_valid_lifetime = $14,"
+        "  calculate_tee_times = $15,"
+        "  t1_percent = cast($16 as float),"
+        "  t2_percent = cast($17 as float),"
+        "  authoritative = $18,"
+        "  boot_file_name = $19,"
+        "  next_server = cast($20 as inet),"
+        "  server_hostname = $21,"
+        "  ddns_send_updates = $22,"
+        "  ddns_override_no_update = $23,"
+        "  ddns_override_client_update = $24,"
+        "  ddns_replace_client_name = $25,"
+        "  ddns_generated_prefix = $26,"
+        "  ddns_qualifying_suffix = $27,"
+        "  reservations_in_subnet = $28,"
+        "  reservations_out_of_pool = $29,"
+        "  cache_threshold = cast($30 as float),"
+        "  cache_max_age = $31,"
+        "  offer_lifetime = $32,"
+        "  allocator = $33 "
+        "WHERE name = $34"
+    },
+
+    // Update existing option definition.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION_DEF4,
+        13,
+        {
+            OID_INT2,       //  1 code
+            OID_VARCHAR,    //  2 name
+            OID_VARCHAR,    //  3 space
+            OID_INT2,       //  4 type
+            OID_TIMESTAMP,  //  5 modification_ts
+            OID_BOOL,       //  6 is_array
+            OID_VARCHAR,    //  7 encapsulate
+            OID_VARCHAR,    //  8 record_types
+            OID_TEXT,       //  9 user_context
+            OID_INT2,       // 10 class_id
+            OID_VARCHAR,    // 11 server_tag
+            OID_INT2,       // 12 code (of option to update)
+            OID_VARCHAR,    // 13 space (of option to update)
+        },
+        "UPDATE_OPTION_DEF4",
+        PGSQL_UPDATE_OPTION_DEF(dhcp4)
+    },
+
+    // Update existing client class option definition.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION_DEF4_CLIENT_CLASS,
+        13,
+        {
+            OID_INT2,       //  1 code
+            OID_VARCHAR,    //  2 name
+            OID_VARCHAR,    //  3 space
+            OID_INT2,       //  4 type
+            OID_TIMESTAMP,  //  5 modification_ts
+            OID_BOOL,       //  6 is_array
+            OID_VARCHAR,    //  7 encapsulate
+            OID_VARCHAR,    //  8 record_types
+            OID_TEXT,       //  9 user_context
+            OID_VARCHAR,    // 10 name (of class option belongs to)
+            OID_VARCHAR,    // 11 server_tag
+            OID_INT2,       // 12 code (of option to update)
+            OID_VARCHAR,    // 13 space (of option to update)
+        },
+        "UPDATE_OPTION_DEF4_CLIENT_CLASS",
+        PGSQL_UPDATE_OPTION_DEF_CLIENT_CLASS(dhcp4)
+    },
+
+    // Update existing global option.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION4,
+        16,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp4_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_VARCHAR,    // 14 server_tag
+            OID_INT2,       // 15 code (of option to update)
+            OID_VARCHAR,    // 16 space (of option to update)
+        },
+        "UPDATE_OPTION4",
+        PGSQL_UPDATE_OPTION4_WITH_TAG(AND o.scope_id = 0 AND o.code = $15 AND o.space = $16)
+    },
+
+    // Update existing subnet level option.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_SUBNET_ID,
+        16,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp4_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_INT8,       // 14 subnet_id (of option to update)
+            OID_INT2,       // 15 code (of option to update)
+            OID_VARCHAR     // 16 space (of option to update)
+        },
+        "UPDATE_OPTION4_SUBNET_ID",
+        PGSQL_UPDATE_OPTION4_NO_TAG(o.scope_id = 1 AND o.dhcp4_subnet_id = $14 AND o.code = $15 AND o.space = $16)
+    },
+
+    // Update existing pool level option.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_POOL_ID,
+        16,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp4_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_INT8,       // 14 pool_id (of option to update)
+            OID_INT2,       // 15 code (of option to update)
+            OID_VARCHAR     // 16 space (of option to update)
+        },
+        "UPDATE_OPTION4_POOL_ID",
+        PGSQL_UPDATE_OPTION4_NO_TAG(o.scope_id = 5 AND o.pool_id = $14 AND o.code = $15 AND o.space = $16)
+    },
+
+    // Update existing shared network level option.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_SHARED_NETWORK,
+        16,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp4_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_VARCHAR,    // 14 shared_network_name (of option to update)
+            OID_INT2,       // 15 code (of option to update)
+            OID_VARCHAR     // 16 space (of option to update)
+        },
+        "UPDATE_OPTION4_SHARED_NETWORK",
+        PGSQL_UPDATE_OPTION4_NO_TAG(o.scope_id = 4 AND o.shared_network_name = $14 AND o.code = $15 AND o.space = $16)
+    },
+
+    // Update existing client class level option.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_OPTION4_CLIENT_CLASS,
+        16,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp4_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_VARCHAR,    // 14 dhcp_client_class (of option to update)
+            OID_INT2,       // 15 code (of option to update)
+            OID_VARCHAR,    // 16 space (of option to update)
+        },
+        "UPDATE_OPTION4_CLIENT_CLASS",
+        PGSQL_UPDATE_OPTION4_NO_TAG(o.scope_id = 2 AND o.dhcp_client_class = $14 AND o.code = $15 AND o.space = $16)
+    },
+
+    // Update existing client class with specifying its position.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_CLIENT_CLASS4,
+        15,
+        {
+            OID_VARCHAR,    //  1 name
+            OID_TEXT,       //  2 test
+            OID_TEXT,       //  3 next_server - cast as inet
+            OID_VARCHAR,    //  4 server_hostname
+            OID_VARCHAR,    //  5 boot_file_name
+            OID_BOOL,       //  6 only_if_required
+            OID_INT8,       //  7 valid_lifetime
+            OID_INT8,       //  8 min_valid_lifetime
+            OID_INT8,       //  9 max_valid_lifetime
+            OID_BOOL,       // 10 depend_on_known_directly
+            OID_VARCHAR,    // 11 follow_class_name
+            OID_TIMESTAMP,  // 12 modification_ts
+            OID_TEXT,       // 13 user_context cast as JSON
+            OID_INT8,       // 14 offer_lifetime
+            OID_VARCHAR     // 15 name (of class to update)
+        },
+        "UPDATE_CLIENT_CLASS4",
+        PGSQL_UPDATE_CLIENT_CLASS4("follow_class_name = $11,")
+    },
+
+    // Update existing client class without specifying its position.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_CLIENT_CLASS4_SAME_POSITION,
+        15,
+        {
+            OID_VARCHAR,    //  1 name
+            OID_TEXT,       //  2 test
+            OID_TEXT,       //  3 next_server - cast as inet
+            OID_VARCHAR,    //  4 server_hostname
+            OID_VARCHAR,    //  5 boot_file_name
+            OID_BOOL,       //  6 only_if_required
+            OID_INT8,       //  7 valid_lifetime
+            OID_INT8,       //  8 min_valid_lifetime
+            OID_INT8,       //  9 max_valid_lifetime
+            OID_BOOL,       // 10 depend_on_known_directly
+            OID_VARCHAR,    // 11 follow_class_name
+            OID_TIMESTAMP,  // 12 modification_ts
+            OID_TEXT,       // 13 user_context cast as JSON
+            OID_INT8,       // 14 offer_lifetime
+            OID_VARCHAR     // 15 name (of class to update)
+        },
+        "UPDATE_CLIENT_CLASS4_SAME_POSITION",
+        PGSQL_UPDATE_CLIENT_CLASS4("")
+    },
+
+    // Update existing server, e.g. server description.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::UPDATE_SERVER4,
+        4,
+        {
+            OID_VARCHAR,    // 1 tag
+            OID_VARCHAR,    // 2 description
+            OID_TIMESTAMP,  // 3 modification_ts
+            OID_VARCHAR     // 4 tag (of server to update)
+        },
+        "UPDATE_SERVER4",
+        PGSQL_UPDATE_SERVER(dhcp4)
+    },
+
+    // Delete global parameter by name.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_GLOBAL_PARAMETER4,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR     // 2 name of parameter
+        },
+        "DELETE_GLOBAL_PARAMETER4",
+        PGSQL_DELETE_GLOBAL_PARAMETER(dhcp4, AND g.name = $2)
+    },
+
+    // Delete all global parameters.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_GLOBAL_PARAMETERS4,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "DELETE_ALL_GLOBAL_PARAMETERS4",
+        PGSQL_DELETE_GLOBAL_PARAMETER(dhcp4)
+    },
+
+    // Delete all global parameters which are unassigned to any servers.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_GLOBAL_PARAMETERS4_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_GLOBAL_PARAMETERS4_UNASSIGNED",
+        PGSQL_DELETE_GLOBAL_PARAMETER_UNASSIGNED(dhcp4)
+    },
+
+    // Delete subnet by id with specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_ID_WITH_TAG,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT8        // 2 subnet_id
+        },
+        "DELETE_SUBNET4_ID_WITH_TAG",
+        PGSQL_DELETE_SUBNET_WITH_TAG(dhcp4, AND s.subnet_id = $2)
+    },
+
+    // Delete subnet by id without specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_ID_ANY,
+        1,
+        {
+            OID_INT8    // 1 subnet_id
+        },
+        "DELETE_SUBNET4_ID_ANY",
+        PGSQL_DELETE_SUBNET_ANY(dhcp4, WHERE s.subnet_id = $1)
+    },
+
+    // Delete subnet by prefix with specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_PREFIX_WITH_TAG,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR     // 2 subnet_prefix
+        },
+        "DELETE_SUBNET4_PREFIX_WITH_TAG",
+        PGSQL_DELETE_SUBNET_WITH_TAG(dhcp4, AND s.subnet_prefix = $2)
+    },
+
+    // Delete subnet by prefix without specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_PREFIX_ANY,
+        1,
+        {
+            OID_VARCHAR // 1 subnet_prefix
+        },
+        "DELETE_SUBNET4_PREFIX_ANY",
+        PGSQL_DELETE_SUBNET_ANY(dhcp4, WHERE s.subnet_prefix = $1)
+    },
+
+    // Delete all subnets.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "DELETE_ALL_SUBNETS4",
+        PGSQL_DELETE_SUBNET_WITH_TAG(dhcp4)
+    },
+
+    // Delete all unassigned subnets.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_SUBNETS4_UNASSIGNED",
+        PGSQL_DELETE_SUBNET_UNASSIGNED(dhcp4)
+    },
+
+    // Delete all subnets for a shared network.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4_SHARED_NETWORK_NAME,
+        1,
+        {
+            OID_VARCHAR // 1 shared_network_name
+        },
+        "DELETE_ALL_SUBNETS4_SHARED_NETWORK_NAME",
+        PGSQL_DELETE_SUBNET_ANY(dhcp4, WHERE s.shared_network_name = $1)
+    },
+
+    // Delete associations of a subnet with server.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_SUBNET4_SERVER,
+        1,
+        {
+            OID_INT8    // 1 subnet_id
+        },
+        "DELETE_SUBNET4_SERVER",
+        PGSQL_DELETE_SUBNET_SERVER(dhcp4),
+    },
+
+    // Delete pools for a subnet.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_POOLS4,
+        2,
+        {
+            OID_INT8,   // 1 subnet_id
+            OID_VARCHAR // 2 subnet_prefix
+        },
+        "DELETE_POOLS4",
+        PGSQL_DELETE_POOLS(dhcp4)
+    },
+
+    // Delete shared network by name with specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_NAME_WITH_TAG,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR     // 2 shared_network_name
+        },
+        "DELETE_SHARED_NETWORK4_NAME_WITH_TAG",
+        PGSQL_DELETE_SHARED_NETWORK_WITH_TAG(dhcp4, AND n.name = $2)
+    },
+
+    // Delete shared network by name without specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_NAME_ANY,
+        1,
+        {
+            OID_VARCHAR // 1 shared_network_name
+        },
+        "DELETE_SHARED_NETWORK4_NAME_ANY",
+        PGSQL_DELETE_SHARED_NETWORK_ANY(dhcp4, WHERE n.name = $1)
+    },
+
+    // Delete all shared networks.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SHARED_NETWORKS4,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "DELETE_ALL_SHARED_NETWORKS4",
+        PGSQL_DELETE_SHARED_NETWORK_WITH_TAG(dhcp4)
+    },
+
+    // Delete all unassigned shared networks.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SHARED_NETWORKS4_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_SHARED_NETWORKS4_UNASSIGNED",
+        PGSQL_DELETE_SHARED_NETWORK_UNASSIGNED(dhcp4)
+    },
+
+    // Delete associations of a shared network with server.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_SERVER,
+        1,
+        {
+            OID_VARCHAR // 1 shared_network_name
+        },
+        "DELETE_SHARED_NETWORK4_SERVER",
+        PGSQL_DELETE_SHARED_NETWORK_SERVER(dhcp4)
+    },
+
+    // Delete option definition.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION_DEF4_CODE_NAME,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT2,       // 2 code
+            OID_VARCHAR     // 3 space
+        },
+        "DELETE_OPTION_DEF4_CODE_NAME",
+        PGSQL_DELETE_OPTION_DEF(dhcp4, AND code = $2 AND space = $3)
+    },
+
+    // Delete all option definitions.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_OPTION_DEFS4,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "DELETE_ALL_OPTION_DEFS4",
+        PGSQL_DELETE_OPTION_DEF(dhcp4)
+    },
+
+    // Delete all option definitions which are assigned to no servers.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_OPTION_DEFS4_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_OPTION_DEFS4_UNASSIGNED",
+        PGSQL_DELETE_OPTION_DEF_UNASSIGNED(dhcp4)
+    },
+
+    // Delete client class specific option definitions.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION_DEFS4_CLIENT_CLASS,
+        1,
+        {
+            OID_VARCHAR // 1 class name
+        },
+        "DELETE_OPTION_DEFS4_CLIENT_CLASS",
+        PGSQL_DELETE_OPTION_DEFS_CLIENT_CLASS(dhcp4)
+    },
+
+    // Delete single global option.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION4,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT2,       // 2 code
+            OID_VARCHAR     // 3 space
+        },
+        "DELETE_OPTION4",
+        PGSQL_DELETE_OPTION_WITH_TAG(dhcp4, AND o.scope_id = 0 AND o.code = $2 AND o.space = $3)
+    },
+
+    // Delete all global options which are unassigned to any servers.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_GLOBAL_OPTIONS4_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_GLOBAL_OPTIONS4_UNASSIGNED",
+        PGSQL_DELETE_OPTION_UNASSIGNED(dhcp4, AND o.scope_id = 0)
+    },
+
+    // Delete single option from a subnet.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION4_SUBNET_ID,
+        3,
+        {
+            OID_INT8,   // 1 subnet_id
+            OID_INT2,   // 2 code
+            OID_VARCHAR // 3 space
+        },
+        "DELETE_OPTION4_SUBNET_ID",
+        PGSQL_DELETE_OPTION_NO_TAG(dhcp4,
+            WHERE o.scope_id = 1 AND o.dhcp4_subnet_id = $1 AND o.code = $2 AND o.space = $3)
+    },
+
+    // Delete single option from a pool.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION4_POOL_RANGE,
+        4,
+        {
+            OID_TEXT,   // 1 start_address - cast as inet
+            OID_TEXT,   // 2 start_address - cast as inet
+            OID_INT2,   // 3 code
+            OID_VARCHAR // 4 space
+        },
+        "DELETE_OPTION4_POOL_RANGE",
+        PGSQL_DELETE_OPTION_POOL_RANGE(dhcp4, o.scope_id = 5 AND o.code = $3 AND o.space = $4)
+    },
+
+    // Delete single option from a shared network.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_OPTION4_SHARED_NETWORK,
+        3,
+        {
+            OID_VARCHAR,    // 1 shared_network_name
+            OID_INT2,       // 2 code
+            OID_VARCHAR     // 3 space
+        },
+        "DELETE_OPTION4_SHARED_NETWORK",
+        PGSQL_DELETE_OPTION_NO_TAG(dhcp4,
+            WHERE o.scope_id = 4 AND o.shared_network_name = $1 AND o.code = $2 AND o.space = $3)
+    },
+
+    // Delete options belonging to a subnet.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_OPTIONS4_SUBNET_ID_PREFIX,
+        2,
+        {
+            OID_INT8,   // 1 subnet_id
+            OID_VARCHAR // 2 subnet_prefix
+        },
+        "DELETE_OPTIONS4_SUBNET_ID_PREFIX",
+        PGSQL_DELETE_OPTION_SUBNET_ID_PREFIX(dhcp4)
+    },
+
+    // Delete options belonging to a shared_network.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_OPTIONS4_SHARED_NETWORK,
+        1,
+        {
+            OID_VARCHAR // shared_network_name
+        },
+        "DELETE_OPTIONS4_SHARED_NETWORK",
+        PGSQL_DELETE_OPTION_NO_TAG(dhcp4, WHERE o.scope_id = 4 AND o.shared_network_name = $1)
+    },
+
+    // Delete options belonging to a client class.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_OPTIONS4_CLIENT_CLASS,
+        1,
+        {
+            OID_VARCHAR // dhcp_client_class
+        },
+        "DELETE_OPTIONS4_CLIENT_CLASS",
+        PGSQL_DELETE_OPTION_NO_TAG(dhcp4, WHERE o.scope_id = 2 AND o.dhcp_client_class = $1)
+    },
+
+    // Delete all dependencies of a client class.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_DEPENDENCY,
+        1,
+        {
+            OID_VARCHAR, // 1 class name
+        },
+        "DELETE_CLIENT_CLASS4_DEPENDENCY",
+        PGSQL_DELETE_CLIENT_CLASS_DEPENDENCY(dhcp4)
+    },
+
+    // Delete associations of a client class with server.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_SERVER,
+        1,
+        {
+            OID_VARCHAR // 1 class name
+        },
+        "DELETE_CLIENT_CLASS4_SERVER",
+        PGSQL_DELETE_CLIENT_CLASS_SERVER(dhcp4),
+    },
+
+    // Delete all client classes.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_CLIENT_CLASSES4,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "DELETE_ALL_CLIENT_CLASSES4",
+        PGSQL_DELETE_CLIENT_CLASS_WITH_TAG(dhcp4)
+    },
+
+    // Delete all unassigned client classes.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_CLIENT_CLASSES4_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_CLIENT_CLASSES4_UNASSIGNED",
+        PGSQL_DELETE_CLIENT_CLASS_UNASSIGNED(dhcp4)
+    },
+
+    // Delete specified client class.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR     // 2 name
+        },
+        "DELETE_CLIENT_CLASS4",
+        PGSQL_DELETE_CLIENT_CLASS_WITH_TAG(dhcp4, AND name = $2)
+    },
+
+    // Delete any client class with a given name.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_CLIENT_CLASS4_ANY,
+        1,
+        {
+            OID_VARCHAR     // 1 name
+        },
+        "DELETE_CLIENT_CLASS4_ANY",
+        PGSQL_DELETE_CLIENT_CLASS_ANY(dhcp4, AND name = $1)
+    },
+
+    // Delete a server by tag.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_SERVER4,
+        1,
+        {
+            OID_VARCHAR // server_tag
+        },
+        "DELETE_SERVER4",
+        PGSQL_DELETE_SERVER(dhcp4)
+    },
+
+    // Deletes all servers except logical server 'all'.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SERVERS4,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_SERVERS4",
+        PGSQL_DELETE_ALL_SERVERS(dhcp4)
+    },
+
+    // Fetches the last sequence id for the given table and column.
+    {
+        // PgSqlConfigBackendDHCPv4Impl::GET_LAST_INSERT_ID4,
+        // args are: table name, sequence column name
+        2,
+        {
+            OID_VARCHAR,
+            OID_VARCHAR
+        },
+        "GET_LAST_INSERT_ID4",
+        "SELECT CURRVAL(PG_GET_SERIAL_SEQUENCE($1, $2))"
+    }
+}
+};
+
+} // end anonymous namespace
+
+PgSqlConfigBackendDHCPv4Impl::PgSqlConfigBackendDHCPv4Impl(const DatabaseConnection::ParameterMap& parameters)
+    : PgSqlConfigBackendImpl(parameters, &PgSqlConfigBackendDHCPv4Impl::dbReconnect,
+      PgSqlConfigBackendDHCPv4Impl::GET_LAST_INSERT_ID4) {
+    // Prepare query statements. Those are will be only used to retrieve
+    // information from the database, so they can be used even if the
+    // database is read only for the current user.
+    conn_.prepareStatements(tagged_statements.begin(),
+                            tagged_statements.end());
+// @todo As part of enabling read-only CB access, statements need to
+// be limited:
+//                            tagged_statements.begin() + WRITE_STMTS_BEGIN);
+
+    // Create unique timer name per instance.
+    timer_name_ = "PgSqlConfigBackend4[";
+    timer_name_ += boost::lexical_cast<std::string>(reinterpret_cast<uint64_t>(this));
+    timer_name_ += "]DbReconnectTimer";
+
+    // Create ReconnectCtl for this connection.
+    conn_.makeReconnectCtl(timer_name_);
+}
+
+PgSqlConfigBackendDHCPv4Impl::~PgSqlConfigBackendDHCPv4Impl() {
+}
+
+PgSqlTaggedStatement&
+PgSqlConfigBackendDHCPv4Impl::getStatement(size_t index) const {
+    if (index >= tagged_statements.size()) {
+        isc_throw(BadValue, "PgSqlConfigBackendDHCPv4Impl::getStatement index: "
+                  << index << ", is invalid");
+    }
+
+    return(tagged_statements[index]);
+}
+
+PgSqlConfigBackendDHCPv4::PgSqlConfigBackendDHCPv4(const DatabaseConnection::ParameterMap& parameters)
+    : impl_(new PgSqlConfigBackendDHCPv4Impl(parameters)), base_impl_(impl_) {
+}
+
+bool
+PgSqlConfigBackendDHCPv4::isUnusable() {
+    return (impl_->conn_.isUnusable());
+}
+
+DatabaseConnection::ParameterMap
+PgSqlConfigBackendDHCPv4::getParameters() const {
+    return (impl_->getParameters());
+}
+
+Subnet4Ptr
+PgSqlConfigBackendDHCPv4::getSubnet4(const ServerSelector& server_selector,
+                                     const std::string& subnet_prefix) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SUBNET4_BY_PREFIX)
+        .arg(subnet_prefix);
+    return (impl_->getSubnet4(server_selector, subnet_prefix));
+}
+
+Subnet4Ptr
+PgSqlConfigBackendDHCPv4::getSubnet4(const ServerSelector& server_selector,
+                                     const SubnetID& subnet_id) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SUBNET4_BY_SUBNET_ID)
+        .arg(subnet_id);
+    return (impl_->getSubnet4(server_selector, subnet_id));
+}
+
+Subnet4Collection
+PgSqlConfigBackendDHCPv4::getAllSubnets4(const ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SUBNETS4);
+    Subnet4Collection subnets;
+    impl_->getAllSubnets4(server_selector, subnets);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SUBNETS4_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+Subnet4Collection
+PgSqlConfigBackendDHCPv4::getModifiedSubnets4(const ServerSelector& server_selector,
+                                              const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_SUBNETS4)
+        .arg(util::ptimeToText(modification_time));
+    Subnet4Collection subnets;
+    impl_->getModifiedSubnets4(server_selector, modification_time, subnets);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_SUBNETS4_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+Subnet4Collection
+PgSqlConfigBackendDHCPv4::getSharedNetworkSubnets4(const ServerSelector& /* server_selector */,
+                                                   const std::string& shared_network_name) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4)
+        .arg(shared_network_name);
+    Subnet4Collection subnets;
+    impl_->getSharedNetworkSubnets4(ServerSelector::ANY(), shared_network_name, subnets);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+SharedNetwork4Ptr
+PgSqlConfigBackendDHCPv4::getSharedNetwork4(const ServerSelector& server_selector,
+                                            const std::string& name) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SHARED_NETWORK4)
+        .arg(name);
+    return (impl_->getSharedNetwork4(server_selector, name));
+}
+
+SharedNetwork4Collection
+PgSqlConfigBackendDHCPv4::getAllSharedNetworks4(const ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SHARED_NETWORKS4);
+    SharedNetwork4Collection shared_networks;
+    impl_->getAllSharedNetworks4(server_selector, shared_networks);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT)
+        .arg(shared_networks.size());
+    return (shared_networks);
+}
+
+SharedNetwork4Collection
+PgSqlConfigBackendDHCPv4::getModifiedSharedNetworks4(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4)
+        .arg(util::ptimeToText(modification_time));
+    SharedNetwork4Collection shared_networks;
+    impl_->getModifiedSharedNetworks4(server_selector, modification_time, shared_networks);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT)
+        .arg(shared_networks.size());
+    return (shared_networks);
+}
+
+OptionDefinitionPtr
+PgSqlConfigBackendDHCPv4::getOptionDef4(const ServerSelector& server_selector,
+                                        const uint16_t code,
+                                        const std::string& space) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_OPTION_DEF4)
+        .arg(code).arg(space);
+    return (impl_->getOptionDef(PgSqlConfigBackendDHCPv4Impl::GET_OPTION_DEF4_CODE_SPACE,
+                                server_selector, code, space));
+}
+
+OptionDefContainer
+PgSqlConfigBackendDHCPv4::getAllOptionDefs4(const ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_OPTION_DEFS4);
+    OptionDefContainer option_defs;
+    impl_->getAllOptionDefs(PgSqlConfigBackendDHCPv4Impl::GET_ALL_OPTION_DEFS4,
+                            server_selector, option_defs);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_OPTION_DEFS4_RESULT)
+        .arg(option_defs.size());
+    return (option_defs);
+}
+
+OptionDefContainer
+PgSqlConfigBackendDHCPv4::getModifiedOptionDefs4(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_OPTION_DEFS4)
+        .arg(util::ptimeToText(modification_time));
+    OptionDefContainer option_defs;
+    impl_->getModifiedOptionDefs(PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_OPTION_DEFS4,
+                                 server_selector, modification_time, option_defs);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT)
+        .arg(option_defs.size());
+    return (option_defs);
+}
+
+OptionDescriptorPtr
+PgSqlConfigBackendDHCPv4::getOption4(const ServerSelector& server_selector,
+                                     const uint16_t code,
+                                     const std::string& space) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_OPTION4)
+        .arg(code).arg(space);
+    return (impl_->getOption(PgSqlConfigBackendDHCPv4Impl::GET_OPTION4_CODE_SPACE,
+                             Option::V4, server_selector, code, space));
+}
+
+OptionContainer
+PgSqlConfigBackendDHCPv4::getAllOptions4(const ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_OPTIONS4);
+    OptionContainer options = impl_->getAllOptions(PgSqlConfigBackendDHCPv4Impl::GET_ALL_OPTIONS4,
+            Option::V4, server_selector);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_OPTIONS4_RESULT)
+        .arg(options.size());
+    return (options);
+}
+
+OptionContainer
+PgSqlConfigBackendDHCPv4::getModifiedOptions4(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_OPTIONS4)
+        .arg(util::ptimeToText(modification_time));
+    OptionContainer options = impl_->getModifiedOptions(PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_OPTIONS4,
+            Option::V4, server_selector, modification_time);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_OPTIONS4_RESULT)
+        .arg(options.size());
+    return (options);
+}
+
+StampedValuePtr
+PgSqlConfigBackendDHCPv4::getGlobalParameter4(const ServerSelector& server_selector,
+                                              const std::string& name) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_GLOBAL_PARAMETER4)
+        .arg(name);
+    return (impl_->getGlobalParameter4(server_selector, name));
+}
+
+StampedValueCollection
+PgSqlConfigBackendDHCPv4::getAllGlobalParameters4(const ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4);
+    StampedValueCollection parameters;
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(tag.get());
+        impl_->getGlobalParameters(PgSqlConfigBackendDHCPv4Impl::GET_ALL_GLOBAL_PARAMETERS4,
+                                   in_bindings, parameters);
+    }
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT)
+        .arg(parameters.size());
+    return (parameters);
+}
+
+StampedValueCollection
+PgSqlConfigBackendDHCPv4::getModifiedGlobalParameters4(const db::ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4)
+        .arg(util::ptimeToText(modification_time));
+    StampedValueCollection parameters;
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(tag.get());
+        in_bindings.addTimestamp(modification_time);
+
+        impl_->getGlobalParameters(PgSqlConfigBackendDHCPv4Impl::GET_MODIFIED_GLOBAL_PARAMETERS4,
+                                   in_bindings, parameters);
+    }
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT)
+        .arg(parameters.size());
+    return (parameters);
+}
+
+ClientClassDefPtr
+PgSqlConfigBackendDHCPv4::getClientClass4(const db::ServerSelector& server_selector,
+                                          const std::string& name) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_CLIENT_CLASS4)
+        .arg(name);
+    return (impl_->getClientClass4(server_selector, name));
+}
+
+ClientClassDictionary
+PgSqlConfigBackendDHCPv4::getAllClientClasses4(const db::ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_CLIENT_CLASSES4);
+    ClientClassDictionary client_classes;
+    impl_->getAllClientClasses4(server_selector, client_classes);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT)
+        .arg(client_classes.getClasses()->size());
+    return (client_classes);
+}
+
+ClientClassDictionary
+PgSqlConfigBackendDHCPv4::getModifiedClientClasses4(const db::ServerSelector& server_selector,
+                                                    const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4)
+        .arg(util::ptimeToText(modification_time));
+    ClientClassDictionary client_classes;
+    impl_->getModifiedClientClasses4(server_selector, modification_time, client_classes);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT)
+        .arg(client_classes.getClasses()->size());
+    return (client_classes);
+}
+
+AuditEntryCollection
+PgSqlConfigBackendDHCPv4::getRecentAuditEntries(const db::ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time,
+        const uint64_t& modification_id) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4)
+      .arg(util::ptimeToText(modification_time))
+      .arg(modification_id);
+    AuditEntryCollection audit_entries;
+    impl_->getRecentAuditEntries(PgSqlConfigBackendDHCPv4Impl::GET_AUDIT_ENTRIES4_TIME,
+                                 server_selector, modification_time,
+                                 modification_id, audit_entries);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT)
+        .arg(audit_entries.size());
+    return (audit_entries);
+}
+
+ServerCollection
+PgSqlConfigBackendDHCPv4::getAllServers4() const {
+    ServerCollection servers;
+
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SERVERS4);
+    impl_->getAllServers(PgSqlConfigBackendDHCPv4Impl::GET_ALL_SERVERS4,
+                         servers);
+
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SERVERS4_RESULT)
+        .arg(servers.size());
+    return (servers);
+}
+
+ServerPtr
+PgSqlConfigBackendDHCPv4::getServer4(const data::ServerTag& server_tag) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SERVER4)
+        .arg(server_tag.get());
+    return (impl_->getServer(PgSqlConfigBackendDHCPv4Impl::GET_SERVER4, server_tag));
+}
+
+void
+PgSqlConfigBackendDHCPv4::createUpdateSubnet4(const ServerSelector& server_selector,
+                                              const Subnet4Ptr& subnet) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_SUBNET4)
+        .arg(subnet);
+    impl_->createUpdateSubnet4(server_selector, subnet);
+}
+
+void
+PgSqlConfigBackendDHCPv4::createUpdateSharedNetwork4(const ServerSelector& server_selector,
+                                                     const SharedNetwork4Ptr& shared_network) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK4)
+        .arg(shared_network->getName());
+    impl_->createUpdateSharedNetwork4(server_selector, shared_network);
+}
+
+void
+PgSqlConfigBackendDHCPv4::createUpdateOptionDef4(const ServerSelector& server_selector,
+                                                 const OptionDefinitionPtr& option_def) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_OPTION_DEF4)
+        .arg(option_def->getName()).arg(option_def->getCode());
+    impl_->createUpdateOptionDef4(server_selector, option_def);
+}
+
+void
+PgSqlConfigBackendDHCPv4::createUpdateOption4(const ServerSelector& server_selector,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_OPTION4);
+    impl_->createUpdateOption4(server_selector, option);
+}
+
+void
+PgSqlConfigBackendDHCPv4::createUpdateOption4(const db::ServerSelector& server_selector,
+                                              const std::string& shared_network_name,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4)
+        .arg(shared_network_name);
+    impl_->createUpdateOption4(server_selector, shared_network_name, option, false);
+}
+
+void
+PgSqlConfigBackendDHCPv4::createUpdateOption4(const ServerSelector& server_selector,
+                                              const SubnetID& subnet_id,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4)
+        .arg(subnet_id);
+    impl_->createUpdateOption4(server_selector, subnet_id, option, false);
+}
+
+void
+PgSqlConfigBackendDHCPv4::createUpdateOption4(const ServerSelector& server_selector,
+                                              const asiolink::IOAddress& pool_start_address,
+                                              const asiolink::IOAddress& pool_end_address,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4)
+        .arg(pool_start_address.toText()).arg(pool_end_address.toText());
+    impl_->createUpdateOption4(server_selector, pool_start_address, pool_end_address,
+                               option);
+}
+
+void
+PgSqlConfigBackendDHCPv4::createUpdateGlobalParameter4(const ServerSelector& server_selector,
+                                                       const StampedValuePtr& value) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4)
+        .arg(value->getName());
+    impl_->createUpdateGlobalParameter4(server_selector, value);
+}
+
+void
+PgSqlConfigBackendDHCPv4::createUpdateClientClass4(const db::ServerSelector& server_selector,
+                                                   const ClientClassDefPtr& client_class,
+                                                   const std::string& follow_class_name) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS4)
+        .arg(client_class->getName());
+    impl_->createUpdateClientClass4(server_selector, client_class, follow_class_name);
+}
+
+void
+PgSqlConfigBackendDHCPv4::createUpdateServer4(const ServerPtr& server) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_SERVER4)
+        .arg(server->getServerTagAsText());
+    impl_->createUpdateServer(PgSqlConfigBackendDHCPv4Impl::CREATE_AUDIT_REVISION,
+                              PgSqlConfigBackendDHCPv4Impl::INSERT_SERVER4,
+                              PgSqlConfigBackendDHCPv4Impl::UPDATE_SERVER4,
+                              server);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteSubnet4(const ServerSelector& server_selector,
+                                        const std::string& subnet_prefix) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_PREFIX_SUBNET4)
+        .arg(subnet_prefix);
+    uint64_t result = impl_->deleteSubnet4(server_selector, subnet_prefix);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteSubnet4(const ServerSelector& server_selector,
+                                        const SubnetID& subnet_id) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4)
+        .arg(subnet_id);
+    uint64_t result = impl_->deleteSubnet4(server_selector, subnet_id);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteAllSubnets4(const ServerSelector& server_selector) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SUBNETS4);
+
+    int index = (server_selector.amUnassigned() ?
+                 PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4_UNASSIGNED :
+                 PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all subnets",
+                                                 "deleted all subnets", true);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SUBNETS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteSharedNetworkSubnets4(const db::ServerSelector& server_selector,
+                                                      const std::string& shared_network_name) {
+    if (!server_selector.amAny()) {
+        isc_throw(InvalidOperation, "deleting all subnets from a shared "
+                  "network requires using ANY server selector");
+    }
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4)
+        .arg(shared_network_name);
+    uint64_t result = impl_->deleteTransactional(PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SUBNETS4_SHARED_NETWORK_NAME,
+                                                 server_selector,
+                                                 "deleting all subnets for a shared network",
+                                                 "deleted all subnets for a shared network",
+                                                 true, shared_network_name);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteSharedNetwork4(const ServerSelector& server_selector,
+                                               const std::string& name) {
+    /// @todo Using UNASSIGNED selector is allowed by the CB API but we don't have
+    /// dedicated query for this at the moment. The user should use ANY to delete
+    /// the shared network by name.
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "deleting an unassigned shared network requires "
+                  "an explicit server tag or using ANY server. The UNASSIGNED server "
+                  "selector is currently not supported");
+    }
+
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK4)
+        .arg(name);
+
+    int index = (server_selector.amAny() ?
+                 PgSqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_NAME_ANY :
+                 PgSqlConfigBackendDHCPv4Impl::DELETE_SHARED_NETWORK4_NAME_WITH_TAG);
+    uint64_t result = impl_->deleteTransactional(index, server_selector,
+                                                 "deleting a shared network",
+                                                 "shared network deleted", true, name);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteAllSharedNetworks4(const ServerSelector& server_selector) {
+    if (server_selector.amAny()) {
+        isc_throw(InvalidOperation, "deleting all shared networks for ANY server is not"
+                  " supported");
+    }
+
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4);
+
+    int index = (server_selector.amUnassigned() ?
+                 PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SHARED_NETWORKS4_UNASSIGNED :
+                 PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_SHARED_NETWORKS4);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all shared networks",
+                                                 "deleted all shared networks", true);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteOptionDef4(const ServerSelector& server_selector,
+                                           const uint16_t code,
+                                           const std::string& space) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_OPTION_DEF4)
+        .arg(code).arg(space);
+    uint64_t result = impl_->deleteOptionDef4(server_selector, code, space);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_OPTION_DEF4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteAllOptionDefs4(const ServerSelector& server_selector) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_OPTION_DEFS4);
+    uint64_t result = impl_->deleteTransactional(PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_OPTION_DEFS4,
+                                                 server_selector, "deleting all option definitions",
+                                                 "deleted all option definitions", true);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteOption4(const ServerSelector& server_selector,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_OPTION4)
+        .arg(code).arg(space);
+    uint64_t result = impl_->deleteOption4(server_selector, code, space);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_OPTION4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteOption4(const ServerSelector& /* server_selector */,
+                                        const std::string& shared_network_name,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4)
+        .arg(shared_network_name).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption4(ServerSelector::ANY(), shared_network_name,
+                                           code, space);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteOption4(const ServerSelector& /* server_selector */,
+                                        const SubnetID& subnet_id,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4)
+        .arg(subnet_id).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption4(ServerSelector::ANY(), subnet_id, code, space);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteOption4(const ServerSelector& /* server_selector */,
+                                        const asiolink::IOAddress& pool_start_address,
+                                        const asiolink::IOAddress& pool_end_address,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_POOL_OPTION4)
+        .arg(pool_start_address.toText()).arg(pool_end_address.toText()).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption4(ServerSelector::ANY(), pool_start_address,
+                                           pool_end_address, code, space);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_POOL_OPTION4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteGlobalParameter4(const ServerSelector& server_selector,
+                                                 const std::string& name) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_GLOBAL_PARAMETER4)
+        .arg(name);
+    uint64_t result = impl_->deleteTransactional(PgSqlConfigBackendDHCPv4Impl::DELETE_GLOBAL_PARAMETER4,
+                                                 server_selector, "deleting global parameter",
+                                                 "global parameter deleted", false, name);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteAllGlobalParameters4(const ServerSelector& server_selector) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4);
+    uint64_t result = impl_->deleteTransactional(PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_GLOBAL_PARAMETERS4,
+                                                 server_selector, "deleting all global parameters",
+                                                 "all global parameters deleted", true);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteClientClass4(const db::ServerSelector& server_selector,
+                                             const std::string& name) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_CLIENT_CLASS4)
+        .arg(name);
+    auto result = impl_->deleteClientClass4(server_selector, name);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_CLIENT_CLASS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteAllClientClasses4(const db::ServerSelector& server_selector) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4);
+
+    int index = (server_selector.amUnassigned() ?
+                 PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_CLIENT_CLASSES4_UNASSIGNED :
+                 PgSqlConfigBackendDHCPv4Impl::DELETE_ALL_CLIENT_CLASSES4);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all client classes",
+                                                 "deleted all client classes", true);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteServer4(const ServerTag& server_tag) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SERVER4)
+        .arg(server_tag.get());
+    uint64_t result = impl_->deleteServer4(server_tag);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SERVER4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv4::deleteAllServers4() {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SERVERS4);
+    uint64_t result = impl_->deleteAllServers4();
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SERVERS4_RESULT)
+        .arg(result);
+    return (result);
+}
+
+std::string
+PgSqlConfigBackendDHCPv4::getType() const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_TYPE4);
+    return (impl_->getType());
+}
+
+std::string
+PgSqlConfigBackendDHCPv4::getHost() const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_HOST4);
+    return (impl_->getHost());
+}
+
+uint16_t
+PgSqlConfigBackendDHCPv4::getPort() const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_PORT4);
+    return (impl_->getPort());
+}
+
+bool
+PgSqlConfigBackendDHCPv4::registerBackendType() {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_REGISTER_BACKEND_TYPE4);
+    return (
+        dhcp::ConfigBackendDHCPv4Mgr::instance().registerBackendFactory("postgresql",
+            [](const db::DatabaseConnection::ParameterMap& params) -> dhcp::ConfigBackendDHCPv4Ptr {
+            return (dhcp::PgSqlConfigBackendDHCPv4Ptr(new dhcp::PgSqlConfigBackendDHCPv4(params)));
+        })
+    );
+}
+
+void
+PgSqlConfigBackendDHCPv4::unregisterBackendType() {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_UNREGISTER_BACKEND_TYPE4);
+    dhcp::ConfigBackendDHCPv4Mgr::instance().unregisterBackendFactory("postgresql");
+}
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp4.h b/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp4.h
new file mode 100644
index 0000000..d78698a
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp4.h
@@ -0,0 +1,631 @@
+// Copyright (C) 2021-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PGSQL_CONFIG_BACKEND_DHCP4_H
+#define PGSQL_CONFIG_BACKEND_DHCP4_H
+
+#include <pgsql_cb_impl.h>
+#include <database/database_connection.h>
+#include <dhcpsrv/client_class_def.h>
+#include <dhcpsrv/config_backend_dhcp4.h>
+#include <pgsql_cb_log.h>
+#include <boost/shared_ptr.hpp>
+
+namespace isc {
+namespace dhcp {
+
+class PgSqlConfigBackendDHCPv4Impl;
+
+/// @brief Implementation of the PgSql Configuration Backend for
+/// Kea DHCPv4 server.
+///
+/// All POSIX times specified in the methods belonging to this
+/// class must be local times.
+///
+/// The server selection mechanisms used by this backend generally adhere
+/// to the rules described for @c ConfigBackendDHCPv4, but support for
+/// some of the selectors is not implemented. Whenever this is the case,
+/// the methods throw @c isc::NotImplemented exception.
+class PgSqlConfigBackendDHCPv4 : public ConfigBackendDHCPv4 {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit PgSqlConfigBackendDHCPv4(const db::DatabaseConnection::ParameterMap& parameters);
+
+    /// @brief Retrieves a single subnet by subnet_prefix.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be retrieved.
+    /// @return Pointer to the retrieved subnet or NULL if not found.
+    virtual Subnet4Ptr
+    getSubnet4(const db::ServerSelector& server_selector,
+               const std::string& subnet_prefix) const;
+
+    /// @brief Retrieves a single subnet by subnet identifier.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of a subnet to be retrieved.
+    /// @return Pointer to the retrieved subnet or NULL if not found.
+    virtual Subnet4Ptr
+    getSubnet4(const db::ServerSelector& server_selector, const SubnetID& subnet_id) const;
+
+    /// @brief Retrieves all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet4Collection
+    getAllSubnets4(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves subnets modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound subnet modification time.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet4Collection
+    getModifiedSubnets4(const db::ServerSelector& server_selector,
+                        const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves all subnets belonging to a specified shared network.
+    ///
+    /// The server selector is currently ignored by this method. All subnets
+    /// for the given shared network are returned regardless of their
+    /// associations with the servers.
+    ///
+    /// @param server_selector Server selector (currently ignored).
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be retrieved.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet4Collection
+    getSharedNetworkSubnets4(const db::ServerSelector& server_selector,
+                             const std::string& shared_network_name) const;
+
+    /// @brief Retrieves shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the shared network to be retrieved.
+    /// @return Pointer to the shared network or NULL if not found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual SharedNetwork4Ptr
+    getSharedNetwork4(const db::ServerSelector& server_selector,
+                      const std::string& name) const;
+
+    /// @brief Retrieves all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of shared network or empty collection if
+    /// no shared network found.
+    virtual SharedNetwork4Collection
+    getAllSharedNetworks4(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves shared networks modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound shared network modification time.
+    /// @return Collection of shared network or empty collection if
+    /// no shared network found.
+    virtual SharedNetwork4Collection
+    getModifiedSharedNetworks4(const db::ServerSelector& server_selector,
+                               const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves single option definition by code and space.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be retrieved.
+    /// @param space Option space of the option to be retrieved.
+    /// @return Pointer to the option definition or NULL if not found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual OptionDefinitionPtr
+    getOptionDef4(const db::ServerSelector& server_selector, const uint16_t code,
+                  const std::string& space) const;
+
+    /// @brief Retrieves all option definitions.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of option definitions or empty collection if
+    /// no option definition found.
+    virtual OptionDefContainer
+    getAllOptionDefs4(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves option definitions modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound option definition modification
+    /// time.
+    /// @return Collection of option definitions or empty collection if
+    /// no option definition found.
+    virtual OptionDefContainer
+    getModifiedOptionDefs4(const db::ServerSelector& server_selector,
+                           const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves single option by code and space.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Pointer to the retrieved option descriptor or null if
+    /// no option was found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual OptionDescriptorPtr
+    getOption4(const db::ServerSelector& server_selector, const uint16_t code,
+               const std::string& space) const;
+
+    /// @brief Retrieves all global options.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of global options or empty collection if no
+    /// option found.
+    virtual OptionContainer
+    getAllOptions4(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves option modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound option modification time.
+    /// @return Collection of global options or empty collection if no
+    /// option found.
+    virtual OptionContainer
+    getModifiedOptions4(const db::ServerSelector& server_selector,
+                        const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves global parameter value.
+    ///
+    /// Typically, the server selector used for this query should be set to
+    /// ONE. It is possible to use the MULTIPLE server selector but in that
+    /// case only the first found parameter is returned.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter to be retrieved.
+    /// @return Value of the global parameter.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual data::StampedValuePtr
+    getGlobalParameter4(const db::ServerSelector& server_selector,
+                        const std::string& name) const;
+
+    /// @brief Retrieves all global parameters.
+    ///
+    /// Using the server selector it is possible to fetch the parameters for
+    /// one or more servers. The following list describes what parameters are
+    /// returned depending on the server selector specified:
+    /// - ALL: only common parameters are returned which are associated with
+    ///   the logical server 'all'. No parameters associated with the explicit
+    ///   server tags are returned.
+    ///
+    /// - ONE: parameters used by the particular sever are returned. This includes
+    ///   parameters associated with the particular server (identified by tag)
+    ///   and parameters associated with the logical server 'all' when server
+    ///   specific parameters are not given. For example, if there is a
+    ///   renew-timer specified for 'server1' tag, different value of the
+    ///   renew-timer specified for 'all' servers and a rebind-timer specified
+    ///   for 'all' servers, the caller will receive renew-timer value associated
+    ///   with the server1 and the rebind-timer value associated with all servers,
+    ///   because there is no explicit rebind-timer specified for server1.
+    ///
+    /// - MULTIPLE: parameters used by multiple servers, but those associated
+    ///   with specific server tags take precedence over the values specified for
+    ///   'all' servers. This is similar to the case of ONE server described
+    ///   above. The effect of querying for parameters belonging to multiple
+    ///   servers is the same as issuing multiple queries with ONE server
+    ///   being selected multiple times.
+    ///
+    /// - UNASSIGNED: parameters not associated with any servers.
+    ///
+    ///
+    /// @param server_selector Server selector.
+    virtual data::StampedValueCollection
+    getAllGlobalParameters4(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves global parameters modified after specified time.
+    ///
+    /// @param modification_time Lower bound modification time.
+    /// @return Collection of modified global parameters.
+    virtual data::StampedValueCollection
+    getModifiedGlobalParameters4(const db::ServerSelector& server_selector,
+                                 const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves a client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Client class name.
+    /// @return Pointer to the retrieved client class.
+    virtual ClientClassDefPtr
+    getClientClass4(const db::ServerSelector& selector, const std::string& name) const;
+
+    /// @brief Retrieves all client classes.
+    ///
+    /// @param selector Server selector.
+    /// @return Collection of client classes.
+    virtual ClientClassDictionary
+    getAllClientClasses4(const db::ServerSelector& selector) const;
+
+    /// @brief Retrieves client classes modified after specified time.
+    ///
+    /// @param selector Server selector.
+    /// @param modification_time Modification time.
+    /// @return Collection of client classes.
+    virtual ClientClassDictionary
+    getModifiedClientClasses4(const db::ServerSelector& selector,
+                              const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves the most recent audit entries.
+    ///
+    /// @param selector Server selector.
+    /// @param modification_time Timestamp being a lower limit for the returned
+    /// result set, i.e. entries later than specified time are returned.
+    /// @param modification_id Identifier being a lower limit for the returned
+    /// result set, used when two (or more) entries have the same
+    /// modification_time.
+    /// @return Collection of audit entries.
+    virtual db::AuditEntryCollection
+    getRecentAuditEntries(const db::ServerSelector& server_selector,
+                          const boost::posix_time::ptime& modification_time,
+                          const uint64_t& modification_id) const;
+
+    /// @brief Retrieves all servers.
+    ///
+    /// This method returns the list of servers excluding the logical server
+    /// 'all'.
+    ///
+    /// @return Collection of servers from the backend.
+    virtual db::ServerCollection
+    getAllServers4() const;
+
+    /// @brief Retrieves a server.
+    ///
+    /// @param server_tag Tag of the server to be retrieved.
+    /// @return Pointer to the server instance or null pointer if no server
+    /// with the particular tag was found.
+    virtual db::ServerPtr
+    getServer4(const data::ServerTag& server_tag) const;
+
+    /// @brief Creates or updates a subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Subnet to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateSubnet4(const db::ServerSelector& server_selector,
+                        const Subnet4Ptr& subnet);
+
+    /// @brief Creates or updates a shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network Shared network to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateSharedNetwork4(const db::ServerSelector& server_selector,
+                               const SharedNetwork4Ptr& shared_network);
+
+    /// @brief Creates or updates an option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Option definition to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOptionDef4(const db::ServerSelector& server_selector,
+                           const OptionDefinitionPtr& option_def);
+
+    /// @brief Creates or updates global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption4(const db::ServerSelector& server_selector,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of a shared network to which option
+    /// belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption4(const db::ServerSelector& server_selector,
+                        const std::string& shared_network_name,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of a subnet to which option belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption4(const db::ServerSelector& server_selector,
+                        const SubnetID& subnet_id,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool to which
+    /// the option belongs.
+    /// @param pool_end_address Upper bound address of the pool to which the
+    /// option belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption4(const db::ServerSelector& server_selector,
+                        const asiolink::IOAddress& pool_start_address,
+                        const asiolink::IOAddress& pool_end_address,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter.
+    /// @param value Value of the global parameter.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateGlobalParameter4(const db::ServerSelector& server_selector,
+                                 const data::StampedValuePtr& value);
+
+    /// @brief Creates or updates DHCPv4 client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Client class to be added or updated.
+    /// @param follow_class_name name of the class after which the
+    /// new or updated class should be positioned. An empty value
+    /// causes the class to be appended at the end of the class
+    /// hierarchy.
+    virtual void
+    createUpdateClientClass4(const db::ServerSelector& server_selector,
+                             const ClientClassDefPtr& client_class,
+                             const std::string& follow_class_name);
+
+    /// @brief Creates or updates a server.
+    ///
+    /// @param server Instance of the server to be stored.
+    /// @throw InvalidOperation when trying to create a duplicate or
+    /// update the logical server 'all'.
+    virtual void
+    createUpdateServer4(const db::ServerPtr& server);
+
+    /// @brief Deletes subnet by prefix.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSubnet4(const db::ServerSelector& server_selector,
+                  const std::string& subnet_prefix);
+
+    /// @brief Deletes subnet by identifier.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSubnet4(const db::ServerSelector& server_selector, const SubnetID& subnet_id);
+
+    /// @brief Deletes all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllSubnets4(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes all subnets belonging to a specified shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be deleted.
+    /// @return Number of deleted subnets.
+    virtual uint64_t
+    deleteSharedNetworkSubnets4(const db::ServerSelector& server_selector,
+                                const std::string& shared_network_name);
+
+    /// @brief Deletes shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the shared network to be deleted.
+    /// @return Number of deleted shared networks.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSharedNetwork4(const db::ServerSelector& server_selector,
+                         const std::string& name);
+
+    /// @brief Deletes all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted shared networks.
+    virtual uint64_t
+    deleteAllSharedNetworks4(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be deleted.
+    /// @param space Option space of the option to be deleted.
+    /// @return Number of deleted option definitions.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOptionDef4(const db::ServerSelector& server_selector, const uint16_t code,
+                     const std::string& space);
+
+    /// @brief Deletes all option definitions.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted option definitions.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllOptionDefs4(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be deleted.
+    /// @param space Option space of the option to be deleted.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption4(const db::ServerSelector& server_selector, const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network which deleted
+    /// option belongs to
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption4(const db::ServerSelector& server_selector,
+                  const std::string& shared_network_name,
+                  const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to which deleted option
+    /// belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption4(const db::ServerSelector& server_selector, const SubnetID& subnet_id,
+                  const uint16_t code, const std::string& space);
+
+    /// @brief Deletes pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool to which
+    /// deleted option belongs.
+    /// @param pool_end_address Upper bound address of the pool to which the
+    /// deleted option belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption4(const db::ServerSelector& server_selector,
+                  const asiolink::IOAddress& pool_start_address,
+                  const asiolink::IOAddress& pool_end_address,
+                  const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter to be deleted.
+    /// @return Number of deleted global parameters.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteGlobalParameter4(const db::ServerSelector& server_selector,
+                           const std::string& name);
+
+    /// @brief Deletes all global parameters.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted global parameters.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllGlobalParameters4(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes DHCPv4 client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the class to be deleted.
+    /// @return Number of deleted client classes.
+    virtual uint64_t
+    deleteClientClass4(const db::ServerSelector& server_selector,
+                       const std::string& name);
+
+    /// @brief Deletes all client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted client classes.
+    virtual uint64_t
+    deleteAllClientClasses4(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes a server from the backend.
+    ///
+    /// @param server_tag Tag of the server to be deleted.
+    /// @return Number of deleted servers.
+    /// @throw isc::InvalidOperation when trying to delete the logical
+    /// server 'all'.
+    virtual uint64_t
+    deleteServer4(const data::ServerTag& server_tag);
+
+    /// @brief Deletes all servers from the backend except the logical
+    /// server 'all'.
+    ///
+    /// @return Number of deleted servers.
+    virtual uint64_t
+    deleteAllServers4();
+
+    /// @brief Returns backend type in the textual format.
+    ///
+    /// @return "postgresql".
+    virtual std::string getType() const;
+
+    /// @brief Returns backend host.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return host on which the database is located.
+    virtual std::string getHost() const;
+
+    /// @brief Returns backend port number.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return Port number on which database service is available.
+    virtual uint16_t getPort() const;
+
+    /// @brief Registers the PgSQL backend factory with backend config manager
+    ///
+    /// This should be called by the hook lib load() function.
+    /// @return True if the factory was registered successfully, false otherwise.
+    static bool registerBackendType();
+
+    /// @brief Unregisters the PgSQL backend factory and discards PgSQL backends
+    ///
+    /// This should be called by the hook lib unload() function.
+    static void unregisterBackendType();
+
+    /// @brief Flag which indicates if the config backend has an unusable
+    /// connection.
+    ///
+    /// @return true if there is at least one unusable connection, false
+    /// otherwise
+    virtual bool isUnusable();
+
+    /// @brief Return backend parameters
+    ///
+    /// Returns the backend parameters
+    ///
+    /// @return Parameters of the backend.
+    isc::db::DatabaseConnection::ParameterMap getParameters() const;
+
+protected:
+
+    /// @brief Pointer to the implementation of the @c PgSqlConfigBackendDHCPv4
+    /// class.
+    boost::shared_ptr<PgSqlConfigBackendDHCPv4Impl> impl_;
+
+    /// @brief Pointer to the base implementation of the backend shared by
+    /// DHCPv4 and DHCPv6 servers.
+    boost::shared_ptr<PgSqlConfigBackendImpl> base_impl_;
+};
+
+/// @brief Pointer to the @c PgSqlConfigBackendDHCPv4 class.
+typedef boost::shared_ptr<PgSqlConfigBackendDHCPv4> PgSqlConfigBackendDHCPv4Ptr;
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif // PGSQL_CONFIG_BACKEND_DHCP4_H
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp6.cc b/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp6.cc
new file mode 100644
index 0000000..20d5617
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp6.cc
@@ -0,0 +1,5725 @@
+// Copyright (C) 2022-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <asiolink/addr_utilities.h>
+#include <pgsql_cb_dhcp6.h>
+#include <pgsql_cb_impl.h>
+#include <pgsql_query_macros_dhcp.h>
+#include <cc/data.h>
+#include <config_backend/constants.h>
+#include <database/database_connection.h>
+#include <database/db_exceptions.h>
+#include <dhcp/classify.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/libdhcp++.h>
+#include <dhcp/option_data_types.h>
+#include <dhcp/option_space.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <dhcpsrv/config_backend_dhcp6_mgr.h>
+#include <dhcpsrv/network.h>
+#include <dhcpsrv/pool.h>
+#include <dhcpsrv/lease.h>
+#include <dhcpsrv/timer_mgr.h>
+#include <dhcpsrv/parsers/client_class_def_parser.h>
+#include <util/buffer.h>
+#include <util/boost_time_utils.h>
+#include <util/multi_threading_mgr.h>
+#include <util/triplet.h>
+#include <pgsql/pgsql_connection.h>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/lexical_cast.hpp>
+#include <boost/pointer_cast.hpp>
+#include <boost/scoped_ptr.hpp>
+
+using namespace isc::cb;
+using namespace isc::db;
+using namespace isc::data;
+using namespace isc::asiolink;
+using namespace isc::log;
+using namespace isc::util;
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Implementation of the PostgreSQL Configuration Backend.
+class PgSqlConfigBackendDHCPv6Impl : public PgSqlConfigBackendImpl {
+public:
+
+    /// @brief Statement tags.
+    ///
+    /// The contents of the enum are indexes into the list of SQL statements.
+    /// It is assumed that the order is such that the indices of statements
+    /// reading the database are less than those of statements modifying the
+    /// database.
+    enum StatementIndex {
+        CREATE_AUDIT_REVISION,
+        CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+        GET_GLOBAL_PARAMETER6,
+        GET_ALL_GLOBAL_PARAMETERS6,
+        GET_MODIFIED_GLOBAL_PARAMETERS6,
+        GET_SUBNET6_ID_NO_TAG,
+        GET_SUBNET6_ID_ANY,
+        GET_SUBNET6_ID_UNASSIGNED,
+        GET_SUBNET6_PREFIX_NO_TAG,
+        GET_SUBNET6_PREFIX_ANY,
+        GET_SUBNET6_PREFIX_UNASSIGNED,
+        GET_ALL_SUBNETS6,
+        GET_ALL_SUBNETS6_UNASSIGNED,
+        GET_MODIFIED_SUBNETS6,
+        GET_MODIFIED_SUBNETS6_UNASSIGNED,
+        GET_SHARED_NETWORK_SUBNETS6,
+        GET_POOL6_RANGE,
+        GET_POOL6_RANGE_ANY,
+        GET_PD_POOL,
+        GET_PD_POOL_ANY,
+        GET_SHARED_NETWORK6_NAME_NO_TAG,
+        GET_SHARED_NETWORK6_NAME_ANY,
+        GET_SHARED_NETWORK6_NAME_UNASSIGNED,
+        GET_ALL_SHARED_NETWORKS6,
+        GET_ALL_SHARED_NETWORKS6_UNASSIGNED,
+        GET_MODIFIED_SHARED_NETWORKS6,
+        GET_MODIFIED_SHARED_NETWORKS6_UNASSIGNED,
+        GET_OPTION_DEF6_CODE_SPACE,
+        GET_ALL_OPTION_DEFS6,
+        GET_MODIFIED_OPTION_DEFS6,
+        GET_OPTION6_CODE_SPACE,
+        GET_ALL_OPTIONS6,
+        GET_MODIFIED_OPTIONS6,
+        GET_OPTION6_SUBNET_ID_CODE_SPACE,
+        GET_OPTION6_POOL_ID_CODE_SPACE,
+        GET_OPTION6_PD_POOL_ID_CODE_SPACE,
+        GET_OPTION6_SHARED_NETWORK_CODE_SPACE,
+        GET_CLIENT_CLASS6_NAME,
+        GET_ALL_CLIENT_CLASSES6,
+        GET_ALL_CLIENT_CLASSES6_UNASSIGNED,
+        GET_MODIFIED_CLIENT_CLASSES6,
+        GET_MODIFIED_CLIENT_CLASSES6_UNASSIGNED,
+        GET_AUDIT_ENTRIES6_TIME,
+        GET_SERVER6,
+        GET_ALL_SERVERS6,
+        INSERT_GLOBAL_PARAMETER6,
+        INSERT_GLOBAL_PARAMETER6_SERVER,
+        INSERT_SUBNET6,
+        INSERT_SUBNET6_SERVER,
+        INSERT_POOL6,
+        INSERT_PD_POOL,
+        INSERT_SHARED_NETWORK6,
+        INSERT_SHARED_NETWORK6_SERVER,
+        INSERT_OPTION_DEF6,
+        INSERT_OPTION_DEF6_CLIENT_CLASS,
+        INSERT_OPTION_DEF6_SERVER,
+        INSERT_OPTION6,
+        INSERT_OPTION6_SERVER,
+        INSERT_CLIENT_CLASS6,
+        INSERT_CLIENT_CLASS6_SERVER,
+        INSERT_CLIENT_CLASS6_DEPENDENCY,
+        INSERT_SERVER6,
+        UPDATE_GLOBAL_PARAMETER6,
+        UPDATE_SUBNET6,
+        UPDATE_SHARED_NETWORK6,
+        UPDATE_OPTION_DEF6,
+        UPDATE_OPTION_DEF6_CLIENT_CLASS,
+        UPDATE_OPTION6,
+        UPDATE_OPTION6_SUBNET_ID,
+        UPDATE_OPTION6_POOL_ID,
+        UPDATE_OPTION6_PD_POOL_ID,
+        UPDATE_OPTION6_SHARED_NETWORK,
+        UPDATE_OPTION6_CLIENT_CLASS,
+        UPDATE_CLIENT_CLASS6,
+        UPDATE_CLIENT_CLASS6_SAME_POSITION,
+        UPDATE_SERVER6,
+        DELETE_GLOBAL_PARAMETER6,
+        DELETE_ALL_GLOBAL_PARAMETERS6,
+        DELETE_ALL_GLOBAL_PARAMETERS6_UNASSIGNED,
+        DELETE_SUBNET6_ID_WITH_TAG,
+        DELETE_SUBNET6_ID_ANY,
+        DELETE_SUBNET6_PREFIX_WITH_TAG,
+        DELETE_SUBNET6_PREFIX_ANY,
+        DELETE_ALL_SUBNETS6,
+        DELETE_ALL_SUBNETS6_UNASSIGNED,
+        DELETE_ALL_SUBNETS6_SHARED_NETWORK_NAME,
+        DELETE_SUBNET6_SERVER,
+        DELETE_POOLS6,
+        DELETE_PD_POOLS,
+        DELETE_SHARED_NETWORK6_NAME_WITH_TAG,
+        DELETE_SHARED_NETWORK6_NAME_ANY,
+        DELETE_ALL_SHARED_NETWORKS6,
+        DELETE_ALL_SHARED_NETWORKS6_UNASSIGNED,
+        DELETE_SHARED_NETWORK6_SERVER,
+        DELETE_OPTION_DEF6_CODE_NAME,
+        DELETE_ALL_OPTION_DEFS6,
+        DELETE_ALL_OPTION_DEFS6_UNASSIGNED,
+        DELETE_OPTION_DEFS6_CLIENT_CLASS,
+        DELETE_OPTION6,
+        DELETE_ALL_GLOBAL_OPTIONS6_UNASSIGNED,
+        DELETE_OPTION6_SUBNET_ID,
+        DELETE_OPTION6_POOL_RANGE,
+        DELETE_OPTION6_PD_POOL,
+        DELETE_OPTION6_SHARED_NETWORK,
+        DELETE_OPTIONS6_SUBNET_ID_PREFIX,
+        DELETE_OPTIONS6_SHARED_NETWORK,
+        DELETE_OPTIONS6_CLIENT_CLASS,
+        DELETE_CLIENT_CLASS6_DEPENDENCY,
+        DELETE_CLIENT_CLASS6_SERVER,
+        DELETE_ALL_CLIENT_CLASSES6,
+        DELETE_ALL_CLIENT_CLASSES6_UNASSIGNED,
+        DELETE_CLIENT_CLASS6,
+        DELETE_CLIENT_CLASS6_ANY,
+        DELETE_SERVER6,
+        DELETE_ALL_SERVERS6,
+        GET_LAST_INSERT_ID6,
+        NUM_STATEMENTS
+    };
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit PgSqlConfigBackendDHCPv6Impl(const DatabaseConnection::ParameterMap&
+                                          parameters);
+
+    /// @brief Destructor.
+    ~PgSqlConfigBackendDHCPv6Impl();
+
+    /// @brief Fetches the SQL statement for a given statement index.
+    ///
+    /// @param index index of the desired statement.
+    /// @throw BadValue if there is no statement corresponding to
+    /// the index.
+    virtual PgSqlTaggedStatement& getStatement(size_t index) const;
+
+    /// @brief Sends query to retrieve global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the parameter to be retrieved.
+    ///
+    /// @return Pointer to the retrieved value or null if such parameter
+    /// doesn't exist.
+    StampedValuePtr getGlobalParameter6(const ServerSelector& server_selector,
+                                        const std::string& name) {
+        StampedValueCollection parameters;
+
+        auto const& tags = server_selector.getTags();
+        for (auto const& tag : tags) {
+            PsqlBindArray in_bindings;
+            in_bindings.addTempString(tag.get());
+            in_bindings.add(name);
+
+            getGlobalParameters(GET_GLOBAL_PARAMETER6, in_bindings, parameters);
+        }
+
+        return (parameters.empty() ? StampedValuePtr() : *parameters.begin());
+    }
+
+    /// @brief Sends query to insert or update global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param value StampedValue describing the parameter to create/update.
+    void createUpdateGlobalParameter6(const db::ServerSelector& server_selector,
+                                      const StampedValuePtr& value) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        auto tag = getServerTag(server_selector, "creating or updating global parameter");
+
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(value->getName());
+        in_bindings.addTempString(value->getValue());
+        in_bindings.add(value->getType()),
+        in_bindings.addTimestamp(value->getModificationTime()),
+        in_bindings.addTempString(tag);
+        in_bindings.addTempString(value->getName());
+
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision audit_revision(this,
+                                           PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                                           server_selector, "global parameter set",
+                                           false);
+
+        // Try to update the existing row.
+        if (updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::UPDATE_GLOBAL_PARAMETER6,
+                              in_bindings) == 0) {
+            // No such parameter found, so let's insert it. We have to adjust the
+            // bindings collection to match the prepared statement for insert.
+            in_bindings.popBack();
+            in_bindings.popBack();
+
+            insertQuery(PgSqlConfigBackendDHCPv6Impl::INSERT_GLOBAL_PARAMETER6,
+                        in_bindings);
+
+            // Successfully inserted global parameter. Now, we have to associate it
+            // with the server tag.
+            PsqlBindArray attach_bindings;
+            uint64_t pid = getLastInsertId("dhcp6_global_parameter", "id");
+            attach_bindings.add(pid);   // id of newly inserted global.
+            attach_bindings.addTimestamp(value->getModificationTime());
+            attachElementToServers(PgSqlConfigBackendDHCPv6Impl::INSERT_GLOBAL_PARAMETER6_SERVER,
+                                   server_selector, attach_bindings);
+        }
+
+        transaction.commit();
+    }
+
+    /// @brief Sends query to the database to retrieve multiple subnets.
+    ///
+    /// Query should order subnets by subnet_id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] subnets Reference to the container where fetched subnets
+    /// will be inserted.
+    void getSubnets6(const StatementIndex& index,
+                     const ServerSelector& server_selector,
+                     const PsqlBindArray& in_bindings,
+                     Subnet6Collection& subnets) {
+        uint64_t last_pool_id = 0;
+        uint64_t last_pd_pool_id = 0;
+        uint64_t last_pool_option_id = 0;
+        uint64_t last_pd_pool_option_id = 0;
+        uint64_t last_option_id = 0;
+        Pool6Ptr last_pool;
+        Pool6Ptr last_pd_pool;
+        std::string last_tag;
+
+        // Execute actual query.
+        selectQuery(index, in_bindings,
+                    [this, &subnets, &last_pool,  &last_pd_pool,
+                     &last_pool_id, &last_pd_pool_id,
+                     &last_pool_option_id, &last_pd_pool_option_id,
+                     &last_option_id, &last_tag](PgSqlResult& r, int row) {
+            // Create a convenience worker for the row.
+            PgSqlResultRowWorker worker(r, row);
+
+            // Get pointer to the last subnet in the collection.
+            Subnet6Ptr last_subnet;
+            if (!subnets.empty()) {
+                last_subnet = *subnets.rbegin();
+            }
+            // Subnet_id is column 0.
+            SubnetID subnet_id = worker.getInt(0) ;
+
+            // Subnet has been returned. Assuming that subnets are ordered by
+            // subnet identifier, if the subnet identifier of the current row
+            // is different than the subnet identifier of the previously returned
+            // row, it means that we have to construct new subnet object.
+            if (!last_subnet || (last_subnet->getID() != subnet_id)) {
+                // Reset per subnet component tracking and server tag because
+                // we're now starting to process a new subnet.
+                last_pool_id = 0;
+                last_pd_pool_id = 0;
+                last_pool_option_id = 0;
+                last_pd_pool_option_id = 0;
+                last_option_id = 0;
+                last_pool.reset();
+                last_pd_pool.reset();
+                last_tag.clear();
+
+                // Get subnet parameters required by the constructor first.
+
+                // subnet_prefix at 1.
+                std::string subnet_prefix = worker.getString(1);
+                auto prefix_pair = Subnet6::parsePrefix(subnet_prefix);
+
+                // preferred_lifetime (5)
+                // min_preferred_lifetime (72)
+                // max_preferred_lifetime (73)
+                auto preferred_lifetime = worker.getTriplet(5, 72, 73);
+
+                // renew_timer at 9.
+                auto renew_timer = worker.getTriplet(9);
+
+                // rebind_timer at 7.
+                auto rebind_timer = worker.getTriplet(7);
+
+                // valid_lifetime at 14.
+                // min_valid_lifetime at 74.
+                // max_valid_lifetime at 75.
+                auto valid_lifetime = worker.getTriplet(14, 74, 75);
+
+                // Create subnet with basic settings.
+                last_subnet = Subnet6::create(prefix_pair.first, prefix_pair.second,
+                                              renew_timer, rebind_timer,
+                                              preferred_lifetime,
+                                              valid_lifetime, subnet_id);
+
+                // 0 and 1 are subnet_id and subnet_prefix
+
+                // client_class at 2.
+                if (!worker.isColumnNull(2)) {
+                    last_subnet->allowClientClass(worker.getString(2));
+                }
+
+                // interface at 3.
+                if (!worker.isColumnNull(3)) {
+                    last_subnet->setIface(worker.getString(3));
+                }
+
+                // modification_ts at 4.
+                last_subnet->setModificationTime(worker.getTimestamp(4));
+
+                // preferred_lifetime is 5.
+
+                if (!worker.isColumnNull(6)) {
+                    last_subnet->setRapidCommit(worker.getBool(6));
+                }
+
+                // rebind_timer is 7.
+
+                // Relay addresses at 8.
+                setRelays(worker, 8, *last_subnet);
+
+                // renew_timer is 9.
+
+                // require_client_classes at 10.
+                setRequiredClasses(worker, 10, [&last_subnet](const std::string& class_name) {
+                    last_subnet->requireClientClass(class_name);
+                });
+
+                // reservations_global at 11.
+                if (!worker.isColumnNull(11)) {
+                    last_subnet->setReservationsGlobal(worker.getBool(11));
+                }
+
+                // shared_network_name at 12.
+                if (!worker.isColumnNull(12)) {
+                    last_subnet->setSharedNetworkName(worker.getString(12));
+                }
+
+                // user_context at 13.
+                if (!worker.isColumnNull(13)) {
+                    ElementPtr user_context = worker.getJSON(13);
+                    if (user_context) {
+                        last_subnet->setContext(user_context);
+                    }
+                }
+
+                // valid_lifetime at 14.
+
+                // 15 to 19 are pool
+                // 20 to 25 are pd pool
+                // 26 to 39 are pool option
+                // 40 to 53 are pd pool option
+                // 54 to 67 are option
+
+                // calculate_tee_times at 68.
+                if (!worker.isColumnNull(68)) {
+                    last_subnet->setCalculateTeeTimes(worker.getBool(68));
+                }
+
+                // t1_percent at 69.
+                if (!worker.isColumnNull(69)) {
+                    last_subnet->setT1Percent(worker.getDouble(69));
+                }
+
+                // t2_percent at 70.
+                if (!worker.isColumnNull(70)) {
+                    last_subnet->setT2Percent(worker.getDouble(70));
+                }
+
+                // interface_id at 71.
+                setInterfaceId(*last_subnet, worker, 71);
+
+                // 72 and 73 are {min,max}_preferred_lifetime
+
+                // 74 and 75 are {min,max}_valid_lifetime
+
+                // 76 is pool client_class
+                // 77 is pool require_client_classes
+                // 78 is pool user_context
+                // 79 is pd pool excluded_prefix
+                // 80 is pd pool excluded_prefix_length
+                // 81 is pd pool client_class
+                // 82 is pd pool require_client_classes
+                // 83 is pd pool user_context
+
+                // ddns_send_updates at 84.
+                if (!worker.isColumnNull(84)) {
+                    last_subnet->setDdnsSendUpdates(worker.getBool(84));
+                }
+
+                // ddns_override_no_update at 85.
+                if (!worker.isColumnNull(85)) {
+                    last_subnet->setDdnsOverrideNoUpdate(worker.getBool(85));
+                }
+
+                // ddns_override_client_update at 86.
+                if (!worker.isColumnNull(86)) {
+                    last_subnet->setDdnsOverrideClientUpdate(worker.getBool(86));
+                }
+
+                // ddns_replace_client_name at 87.
+                if (!worker.isColumnNull(87)) {
+                    last_subnet->setDdnsReplaceClientNameMode(
+                        static_cast<D2ClientConfig::ReplaceClientNameMode>(worker.getSmallInt(87)));
+                }
+
+                // ddns_generated_prefix at 88.
+                if (!worker.isColumnNull(88)) {
+                    last_subnet->setDdnsGeneratedPrefix(worker.getString(88));
+                }
+
+                // ddns_qualifying_suffix at 89.
+                if (!worker.isColumnNull(89)) {
+                    last_subnet->setDdnsQualifyingSuffix(worker.getString(89));
+                }
+
+                // reservations_in_subnet at 90.
+                if (!worker.isColumnNull(90)) {
+                    last_subnet->setReservationsInSubnet(worker.getBool(90));
+                }
+
+                // reservations_out_of_pool at 91.
+                if (!worker.isColumnNull(91)) {
+                    last_subnet->setReservationsOutOfPool(worker.getBool(91));
+                }
+
+                // cache_threshold at 92.
+                if (!worker.isColumnNull(92)) {
+                    last_subnet->setCacheThreshold(worker.getDouble(92));
+                }
+
+                // cache_max_age at 93.
+                if (!worker.isColumnNull(93)) {
+                    last_subnet->setCacheMaxAge(worker.getInt(93));
+                }
+
+                // allocator at 94.
+                if (!worker.isColumnNull(94)) {
+                    last_subnet->setAllocatorType(worker.getString(94));
+                }
+
+                // pd_allocator at 95.
+                if (!worker.isColumnNull(95)) {
+                    last_subnet->setPdAllocatorType(worker.getString(95));
+                }
+
+                // server_tag at 96.
+
+                // Subnet ready. Add it to the list.
+                auto ret = subnets.insert(last_subnet);
+
+                // subnets is a multi index container with unique indexes
+                // but these indexes are unique too in the database,
+                // so this is for sanity only.
+                if (!ret.second) {
+                    isc_throw(Unexpected, "add subnet failed");
+                }
+            }
+
+            // Check for new server tags at 96.
+            if (!worker.isColumnNull(96)) {
+                std::string new_tag = worker.getString(96);
+                if (last_tag != new_tag) {
+                    if (!new_tag.empty() && !last_subnet->hasServerTag(ServerTag(new_tag))) {
+                        last_subnet->setServerTag(new_tag);
+                    }
+
+                    last_tag = new_tag;
+                }
+            }
+
+            // Pool is between 15 and 19 with extra between 76 and 78
+
+            // If the row contains information about the pool and it
+            // appears to be new pool entry (checked by comparing pool
+            // id), let's create the new pool and add it to the
+            // subnet.
+            // pool id (15)
+            // pool start_address (16)
+            // pool end_address (17)
+            if (!worker.isColumnNull(15) &&
+                (worker.getInet6(16) != 0) &&
+                (worker.getInet6(17) != 0) &&
+                (worker.getBigInt(15) > last_pool_id)) {
+                last_pool_id = worker.getBigInt(15);
+                last_pool = Pool6::create(Lease::TYPE_NA,
+                                          IOAddress(worker.getInet6(16)),
+                                          IOAddress(worker.getInet6(17)));
+
+                // pool subnet_id at 18 (ignored)
+                // pool modification_ts at 19 (ignored)
+
+                // pool client_class at 76.
+                if (!worker.isColumnNull(76)) {
+                    last_pool->allowClientClass(worker.getString(76));
+                }
+
+                // pool require_client_classes at 77.
+                setRequiredClasses(worker, 77, [&last_pool](const std::string& class_name) {
+                    last_pool->requireClientClass(class_name);
+                });
+
+                // pool user_context at 78.
+                if (!worker.isColumnNull(78)) {
+                    ElementPtr user_context = worker.getJSON(78);
+                    if (user_context) {
+                        last_pool->setContext(user_context);
+                    }
+                }
+
+                last_subnet->addPool(last_pool);
+            }
+
+            // Pd Pool is between 20 and 25 with extra between 79 and 83
+
+            // If the row contains information about the pd pool and
+            // it appears to be new pd pool entry (checked by
+            // comparing pd pool id), let's create the new pd pool and
+            // add it to the subnet.
+            // pd pool id (20)
+            // pd pool prefix (21)
+            // pd pool prefix_length (22)
+            // pd pool delegated_prefix_length (23)
+            if (!worker.isColumnNull(20) &&
+                (!worker.getString(21).empty()) &&
+                (worker.getSmallInt(22) != 0) &&
+                (worker.getSmallInt(23) != 0) &&
+                (worker.getBigInt(20) > last_pd_pool_id)) {
+
+                // 24 is pd pool subnet_id (ignored)
+                // 25 is pd pool modification_ts (ignored)
+
+                // excluded_prefix (79) and excluded_prefix_length (80)
+                IOAddress excluded_prefix = IOAddress::IPV6_ZERO_ADDRESS();
+                if (!worker.isColumnNull(79)) {
+                    excluded_prefix = worker.getInet6(79);
+                }
+
+                last_pd_pool_id = worker.getBigInt(20);
+                last_pd_pool = Pool6::create(worker.getInet6(21),
+                                             static_cast<uint8_t>(worker.getSmallInt(22)),
+                                             static_cast<uint8_t>(worker.getSmallInt(23)),
+                                             excluded_prefix,
+                                             static_cast<uint8_t>(worker.getSmallInt(80)));
+
+                // pd pool client_class (81)
+                if (!worker.isColumnNull(81)) {
+                    last_pd_pool->allowClientClass(worker.getString(81));
+                }
+
+                // pd pool require_client_classes at 82.
+                setRequiredClasses(worker, 82, [&last_pd_pool](const std::string& class_name) {
+                    last_pd_pool->requireClientClass(class_name);
+                });
+
+                // pd pool user_context at 83.
+                if (!worker.isColumnNull(83)) {
+                    ElementPtr user_context = worker.getJSON(83);
+                    if (user_context) {
+                        last_pd_pool->setContext(user_context);
+                    }
+                }
+
+                last_subnet->addPool(last_pd_pool);
+            }
+
+            // Parse pool-specific option from 26 to 39.
+            if (last_pool && !worker.isColumnNull(26) &&
+                (last_pool_option_id < worker.getBigInt(26))) {
+                last_pool_option_id = worker.getBigInt(26);
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, worker, 26);
+                if (desc) {
+                    last_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+
+            // Parse pd pool-specific option from 40 to 53.
+            if (last_pd_pool && !worker.isColumnNull(40) &&
+                (last_pd_pool_option_id < worker.getBigInt(40))) {
+                last_pd_pool_option_id = worker.getBigInt(40);
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, worker, 40);
+                if (desc) {
+                    last_pd_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+
+            // Parse subnet-specific option from 54 to 67.
+            if (!worker.isColumnNull(54) &&
+                (last_option_id < worker.getBigInt(54))) {
+                last_option_id = worker.getBigInt(54);
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, worker, 54);
+                if (desc) {
+                    last_subnet->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        // Now that we're done fetching the whole subnet, we have to
+        // check if it has matching server tags and toss it if it
+        // doesn't. We skip matching the server tags if we're asking
+        // for ANY subnet.
+        auto& subnet_index = subnets.get<SubnetSubnetIdIndexTag>();
+        tossNonMatchingElements(server_selector, subnet_index);
+    }
+
+    /// @brief Sends query to retrieve single subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Subnet identifier.
+    ///
+    /// @return Pointer to the returned subnet or NULL if such subnet
+    /// doesn't exist.
+    Subnet6Ptr getSubnet6(const ServerSelector& server_selector,
+                          const SubnetID& subnet_id) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a subnet. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet_id);
+
+        auto index = GET_SUBNET6_ID_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = GET_SUBNET6_ID_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = GET_SUBNET6_ID_ANY;
+        }
+
+        Subnet6Collection subnets;
+        getSubnets6(index, server_selector, in_bindings, subnets);
+
+        return (subnets.empty() ? Subnet6Ptr() : *subnets.begin());
+    }
+
+    /// @brief Sends query to retrieve single subnet by prefix.
+    ///
+    /// The prefix should be in the following format: "2001:db8:1::/64".
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Subnet identifier.
+    ///
+    /// @return Pointer to the returned subnet or NULL if such subnet
+    /// doesn't exist.
+    Subnet6Ptr getSubnet6(const ServerSelector& server_selector,
+                          const std::string& subnet_prefix) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a subnet. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet_prefix);
+
+        auto index = GET_SUBNET6_PREFIX_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = GET_SUBNET6_PREFIX_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = GET_SUBNET6_PREFIX_ANY;
+        }
+
+        Subnet6Collection subnets;
+        getSubnets6(index, server_selector, in_bindings, subnets);
+
+        return (subnets.empty() ? Subnet6Ptr() : *subnets.begin());
+    }
+
+    /// @brief Sends query to retrieve all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getAllSubnets6(const ServerSelector& server_selector,
+                        Subnet6Collection& subnets) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching all subnets for ANY "
+                      "server is not supported");
+        }
+
+        auto index = (server_selector.amUnassigned() ? GET_ALL_SUBNETS6_UNASSIGNED :
+                      GET_ALL_SUBNETS6);
+        PsqlBindArray in_bindings;
+        getSubnets6(index, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve modified subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getModifiedSubnets6(const ServerSelector& server_selector,
+                             const boost::posix_time::ptime& modification_ts,
+                             Subnet6Collection& subnets) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified subnets for ANY "
+                      "server is not supported");
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.addTimestamp(modification_ts);
+
+        auto index = (server_selector.amUnassigned() ? GET_MODIFIED_SUBNETS6_UNASSIGNED :
+                      GET_MODIFIED_SUBNETS6);
+        getSubnets6(index, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve all subnets belonging to a shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be retrieved.
+    /// @param [out] subnets Reference to the subnet collection structure where
+    /// subnets should be inserted.
+    void getSharedNetworkSubnets6(const ServerSelector& server_selector,
+                                  const std::string& shared_network_name,
+                                  Subnet6Collection& subnets) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(shared_network_name);
+        getSubnets6(GET_SHARED_NETWORK_SUBNETS6, server_selector, in_bindings, subnets);
+    }
+
+    /// @brief Sends query to retrieve multiple pools.
+    ///
+    /// Query should order pools by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] pools Reference to the container where fetched pools
+    /// will be inserted.
+    /// @param [out] pool_ids Identifiers of the pools returned in @c pools
+    /// argument.
+    void getPools(const StatementIndex& index,
+                  const PsqlBindArray& in_bindings,
+                  PoolCollection& pools,
+                  std::vector<uint64_t>& pool_ids) {
+        uint64_t last_pool_id = 0;
+        uint64_t last_pool_option_id = 0;
+        Pool6Ptr last_pool;
+
+        selectQuery(index, in_bindings,
+                    [this, &last_pool_id, &last_pool_option_id, &last_pool, &pools, &pool_ids]
+                    (PgSqlResult& r, int row) {
+            // Create a convenience worker for the row.
+            PgSqlResultRowWorker worker(r, row);
+
+            // Pool id is column 0.
+            auto id = worker.getBigInt(0) ;
+            if (id > last_pool_id) {
+                // pool start_address (1)
+                // pool end_address (2)
+                last_pool_id = id;
+
+                last_pool = Pool6::create(Lease::TYPE_NA, worker.getInet6(1), worker.getInet6(2));
+
+                // pool subnet_id (3) (ignored)
+
+                // pool client_class (4)
+                if (!worker.isColumnNull(4)) {
+                    last_pool->allowClientClass(worker.getString(4));
+                }
+
+                // pool require_client_classes (5)
+                setRequiredClasses(worker, 5, [&last_pool](const std::string& class_name) {
+                    last_pool->requireClientClass(class_name);
+                });
+
+                // pool user_context (6)
+                if (!worker.isColumnNull(6)) {
+                    ElementPtr user_context = worker.getJSON(6);
+                    if (user_context) {
+                        last_pool->setContext(user_context);
+                    }
+                }
+
+                // pool: modification_ts (7) (ignored)
+
+                pools.push_back(last_pool);
+                pool_ids.push_back(last_pool_id);
+            }
+
+            // Parse pool specific option (8).
+            if (last_pool && !worker.isColumnNull(8) &&
+                (last_pool_option_id < worker.getBigInt(8))) {
+                last_pool_option_id = worker.getBigInt(8);
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, worker, 8);
+                if (desc) {
+                    last_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+    }
+
+    /// @brief Sends query to retrieve multiple pd pools.
+    ///
+    /// Query should order pd pools by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] pd_pools Reference to the container where fetched pools
+    /// will be inserted.
+    /// @param [out] pd_pool_ids Identifiers of the pd pools returned in
+    /// @c pd_pools argument.
+    void getPdPools(const StatementIndex& index,
+                    const PsqlBindArray& in_bindings,
+                    PoolCollection& pd_pools,
+                    std::vector<uint64_t>& pd_pool_ids) {
+        uint64_t last_pd_pool_id = 0;
+        uint64_t last_pd_pool_option_id = 0;
+        Pool6Ptr last_pd_pool;
+
+        selectQuery(index, in_bindings,
+                    [this, &last_pd_pool_id, &last_pd_pool_option_id,
+                     &last_pd_pool, &pd_pools, &pd_pool_ids]
+                    (PgSqlResult& r, int row) {
+            // Create a convenience worker for the row.
+            PgSqlResultRowWorker worker(r, row);
+
+            // Pool id is column 0.
+            auto id = worker.getBigInt(0) ;
+            if (id > last_pd_pool_id) {
+                last_pd_pool_id = id;
+
+                // pd pool prefix (1)
+                // pd pool prefix_length (2)
+                // pd pool delegated_prefix_length (3)
+
+                // excluded_prefix (5) and excluded_prefix_length (6)
+                IOAddress excluded_prefix = IOAddress::IPV6_ZERO_ADDRESS();
+                if (!worker.isColumnNull(5)) {
+                    excluded_prefix = worker.getInet6(5);
+                }
+
+                last_pd_pool = Pool6::create(worker.getInet6(1),
+                                             static_cast<uint8_t>(worker.getSmallInt(2)),
+                                             static_cast<uint8_t>(worker.getSmallInt(3)),
+                                             excluded_prefix,
+                                             static_cast<uint8_t>(worker.getSmallInt(6)));
+
+                // pd pool subnet_id (4) (ignored)
+
+                // pool client_class (7)
+                if (!worker.isColumnNull(7)) {
+                    last_pd_pool->allowClientClass(worker.getString(7));
+                }
+
+                // pool require_client_classes (8)
+                setRequiredClasses(worker, 8, [&last_pd_pool](const std::string& class_name) {
+                    last_pd_pool->requireClientClass(class_name);
+                });
+
+                // pd pool user_context (9)
+                if (!worker.isColumnNull(9)) {
+                    ElementPtr user_context = worker.getJSON(9);
+                    if (user_context) {
+                        last_pd_pool->setContext(user_context);
+                    }
+                }
+
+                // pd pool modification_ts (10) (ignored)
+
+                pd_pools.push_back(last_pd_pool);
+                pd_pool_ids.push_back(last_pd_pool_id);
+            }
+
+            // Parse pd pool specific option between 11 and 25.
+            if (last_pd_pool && !worker.isColumnNull(11) &&
+                (last_pd_pool_option_id < worker.getBigInt(11))) {
+                last_pd_pool_option_id = worker.getBigInt(11);
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, worker, 11);
+                if (desc) {
+                    last_pd_pool->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+    }
+
+    /// @brief Sends query to retrieve single pool by address range.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound pool address.
+    /// @param pool_end_address Upper bound pool address.
+    /// @param pool_id Pool identifier for the returned pool.
+    /// @return Pointer to the pool or null if no such pool found.
+    Pool6Ptr getPool6(const ServerSelector& server_selector,
+                      const IOAddress& pool_start_address,
+                      const IOAddress& pool_end_address,
+                      uint64_t& pool_id) {
+        PoolCollection pools;
+        std::vector<uint64_t> pool_ids;
+
+        if (server_selector.amAny()) {
+            PsqlBindArray in_bindings;
+            in_bindings.addInet6(pool_start_address);
+            in_bindings.addInet6(pool_end_address);
+            getPools(GET_POOL6_RANGE_ANY, in_bindings, pools, pool_ids);
+        } else {
+            auto const& tags = server_selector.getTags();
+            for (auto const& tag : tags) {
+                PsqlBindArray in_bindings;
+                in_bindings.addTempString(tag.get());
+                in_bindings.addInet6(pool_start_address);
+                in_bindings.addInet6(pool_end_address);
+
+                getPools(GET_POOL6_RANGE, in_bindings, pools, pool_ids);
+                // Break if something is found?
+            }
+        }
+
+        // Return upon the first pool found.
+        if (!pools.empty()) {
+            pool_id = pool_ids[0];
+            return (boost::dynamic_pointer_cast<Pool6>(*pools.begin()));
+        }
+
+        pool_id = 0;
+
+        return (Pool6Ptr());
+    }
+
+    /// @brief Sends query to retrieve single pd pool.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pd_pool_prefix Address part of the pd pool prefix.
+    /// @param pd_pool_prefix_length Length of the pd pool prefix.
+    /// @param pd_pool_id Pool identifier for the returned pool.
+    /// @return Pointer to the pool or null if no such pool found.
+    Pool6Ptr getPdPool6(const ServerSelector& server_selector,
+                        const asiolink::IOAddress& pd_pool_prefix,
+                        const uint8_t pd_pool_prefix_length,
+                        uint64_t& pd_pool_id) {
+        PoolCollection pd_pools;
+        std::vector<uint64_t> pd_pool_ids;
+
+        if (server_selector.amAny()) {
+            PsqlBindArray in_bindings;
+            in_bindings.addTempString(pd_pool_prefix.toText());
+            in_bindings.add(pd_pool_prefix_length);
+            getPdPools(GET_PD_POOL_ANY, in_bindings, pd_pools, pd_pool_ids);
+        } else {
+            auto const& tags = server_selector.getTags();
+            for (auto const& tag : tags) {
+                PsqlBindArray in_bindings;
+                in_bindings.addTempString(tag.get());
+                in_bindings.addTempString(pd_pool_prefix.toText());
+                in_bindings.add(pd_pool_prefix_length);
+                getPdPools(GET_PD_POOL, in_bindings, pd_pools, pd_pool_ids);
+            }
+        }
+
+        if (!pd_pools.empty()) {
+            pd_pool_id = pd_pool_ids[0];
+            return (boost::dynamic_pointer_cast<Pool6>(*pd_pools.begin()));
+        }
+
+        pd_pool_id = 0;
+
+        return (Pool6Ptr());
+    }
+
+    /// @brief Sends query to insert or update subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet to be inserted or updated.
+    void createUpdateSubnet6(const ServerSelector& server_selector,
+                             const Subnet6Ptr& subnet) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "creating or updating a subnet for ANY"
+                      " server is not supported");
+
+        } else if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        // Create input bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet->getID());
+        in_bindings.addTempString(subnet->toText());
+        in_bindings.addOptional(subnet->getClientClass(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getIface(Network::Inheritance::NONE));
+        in_bindings.addTimestamp(subnet->getModificationTime());
+        in_bindings.add(subnet->getPreferred(Network::Inheritance::NONE));
+        in_bindings.addMin(subnet->getPreferred(Network::Inheritance::NONE));
+        in_bindings.addMax(subnet->getPreferred(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getRapidCommit(Network::Inheritance::NONE));
+        in_bindings.add(subnet->getT2(Network::Inheritance::NONE));
+        addRelayBinding(in_bindings, subnet);
+        in_bindings.add(subnet->getT1(Network::Inheritance::NONE));
+        addRequiredClassesBinding(in_bindings, subnet);
+        in_bindings.addOptional(subnet->getReservationsGlobal(Network::Inheritance::NONE));
+
+        // Add shared network.
+        SharedNetwork6Ptr shared_network;
+        subnet->getSharedNetwork(shared_network);
+
+        // Check if the subnet is associated with a shared network instance.
+        // If it is, create the binding using the name of the shared network.
+        if (shared_network) {
+            in_bindings.addTempString(shared_network->getName());
+
+        // If the subnet is associated with a shared network by name (no
+        // shared network instance), use this name to create the binding.
+        // This may be the case if the subnet is added as a result of
+        // receiving a control command that merely specifies shared
+        // network name. In that case, it is expected that the shared
+        // network data is already stored in the database.
+        } else if (!subnet->getSharedNetworkName().empty()) {
+            in_bindings.addTempString(subnet->getSharedNetworkName());
+
+        // If the subnet is not associated with a shared network, create
+        // null binding.
+        } else {
+             in_bindings.addNull();
+        }
+
+        in_bindings.add(subnet->getContext());
+        in_bindings.add(subnet->getValid(Network::Inheritance::NONE));
+        in_bindings.addMin(subnet->getValid(Network::Inheritance::NONE));
+        in_bindings.addMax(subnet->getValid(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getCalculateTeeTimes(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getT1Percent(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getT2Percent(Network::Inheritance::NONE));
+        addInterfaceIdBinding(in_bindings, *subnet);
+        in_bindings.addOptional(subnet->getDdnsSendUpdates(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getDdnsOverrideNoUpdate(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getDdnsOverrideClientUpdate(Network::Inheritance::NONE));
+        addDdnsReplaceClientNameBinding(in_bindings, subnet);
+        in_bindings.addOptional(subnet->getDdnsGeneratedPrefix(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getDdnsQualifyingSuffix(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getReservationsInSubnet(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getReservationsOutOfPool(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getCacheThreshold(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getCacheMaxAge(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getAllocatorType(Network::Inheritance::NONE));
+        in_bindings.addOptional(subnet->getPdAllocatorType(Network::Inheritance::NONE));
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision audit_revision(this,
+                                           PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                                           server_selector, "subnet set", true);
+
+        // Create a savepoint in case we are called as part of larger
+        // transaction.
+        conn_.createSavepoint("createUpdateSubnet6");
+
+        try {
+
+            insertQuery(PgSqlConfigBackendDHCPv6Impl::INSERT_SUBNET6, in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            // It already exists, rollback to the savepoint to preserve
+            // any prior work.
+            conn_.rollbackToSavepoint("createUpdateSubnet6");
+
+            // We're updating, so we need to remove any existing pools and options.
+            deletePools6(subnet);
+            deletePdPools6(subnet);
+            deleteOptions6(ServerSelector::ANY(), subnet);
+
+            // Now we need to add two more bindings for WHERE clause.
+            in_bindings.add(subnet->getID());
+            in_bindings.addTempString(subnet->toText());
+
+            // Attempt the update.
+            auto cnt = updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::UPDATE_SUBNET6,
+                                         in_bindings);
+            if (!cnt) {
+                // Possible only if someone deleted it since we tried to insert it
+                // or the query is broken.
+                isc_throw(Unexpected, "Update subnet failed to find subnet id: "
+                          << subnet->getID() << ", prefix: " << subnet->toText());
+            }
+
+            // Remove existing server association.
+            PsqlBindArray server_bindings;
+            server_bindings.add(subnet->getID());
+            updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_SERVER,
+                              server_bindings);
+        }
+
+        // Subnet was successfully created/updated.
+
+        // Insert associations with the servers.
+        PsqlBindArray attach_bindings;
+        attach_bindings.add(subnet->getID());
+        attach_bindings.addTimestamp(subnet->getModificationTime());
+        attachElementToServers(PgSqlConfigBackendDHCPv6Impl::INSERT_SUBNET6_SERVER,
+                               server_selector, attach_bindings);
+
+        // (Re)create pools.
+        for (auto pool : subnet->getPools(Lease::TYPE_NA)) {
+            createPool6(server_selector, boost::dynamic_pointer_cast<Pool6>(pool),
+                        subnet);
+        }
+
+        // (Re)create pd pools.
+        for (auto pd_pool : subnet->getPools(Lease::TYPE_PD)) {
+            createPdPool6(server_selector, boost::dynamic_pointer_cast<Pool6>(pd_pool),
+                          subnet);
+        }
+
+        // (Re)create options.
+        auto option_spaces = subnet->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = subnet->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption6(server_selector, subnet->getID(), desc_copy,
+                                    true);
+            }
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Inserts new IPv6 pool to the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool Pointer to the pool to be inserted.
+    /// @param subnet Pointer to the subnet that this pool belongs to.
+    void createPool6(const ServerSelector& server_selector,
+                     const Pool6Ptr& pool,
+                     const Subnet6Ptr& subnet) {
+        // Create the input bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.addInet6(pool->getFirstAddress());
+        in_bindings.addInet6(pool->getLastAddress());
+        in_bindings.add(subnet->getID());
+        in_bindings.addOptional(pool->getClientClass());
+        addRequiredClassesBinding(in_bindings, pool);
+        in_bindings.add(pool->getContext());
+        in_bindings.addTimestamp(subnet->getModificationTime());
+
+        // Attempt to INSERT the pool.
+        insertQuery(PgSqlConfigBackendDHCPv6Impl::INSERT_POOL6, in_bindings);
+
+        // Get the id of the newly inserted pool.
+        uint64_t pool_id = getLastInsertId("dhcp6_pool", "id");
+
+        // Add the pool's options.
+        auto option_spaces = pool->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = pool->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption6(server_selector, Lease::TYPE_NA,
+                                    pool_id, desc_copy, true);
+            }
+        }
+    }
+
+    /// @brief Inserts new IPv6 pd pool to the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pd_pool Pointer to the pd pool to be inserted.
+    /// @param subnet Pointer to the subnet that this pd pool belongs to.
+    void createPdPool6(const ServerSelector& server_selector,
+                       const Pool6Ptr& pd_pool,
+                       const Subnet6Ptr& subnet) {
+        int plen = prefixLengthFromRange(pd_pool->getFirstAddress(),
+                                         pd_pool->getLastAddress());
+
+        // Extract excluded prefix components.
+        Optional<std::string> xprefix_txt;
+        uint8_t xlen = 0;
+        const Option6PDExcludePtr& xopt = pd_pool->getPrefixExcludeOption();
+        if (xopt) {
+            const IOAddress& prefix = pd_pool->getFirstAddress();
+            const IOAddress& xprefix = xopt->getExcludedPrefix(prefix, pd_pool->getLength());
+            xprefix_txt = xprefix.toText();
+            xlen = xopt->getExcludedPrefixLength();
+        }
+
+        // Create the input bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.addInet6(pd_pool->getFirstAddress());
+        in_bindings.add(plen);
+        in_bindings.add(pd_pool->getLength());
+        in_bindings.add(subnet->getID());
+        in_bindings.addOptional(xprefix_txt);
+        in_bindings.add(xlen);
+        in_bindings.addOptional(pd_pool->getClientClass());
+        addRequiredClassesBinding(in_bindings, pd_pool);
+        in_bindings.add(pd_pool->getContext());
+        in_bindings.addTimestamp(subnet->getModificationTime());
+
+        // Attempt to INSERT the pool.
+        insertQuery(PgSqlConfigBackendDHCPv6Impl::INSERT_PD_POOL, in_bindings);
+
+        // Get the id of the newly inserted pool.
+        uint64_t pd_pool_id = getLastInsertId("dhcp6_pd_pool", "id");
+
+        // Add the pool's options.
+        auto option_spaces = pd_pool->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = pd_pool->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption6(server_selector, Lease::TYPE_PD,
+                                    pd_pool_id, desc_copy, true);
+            }
+        }
+    }
+
+    /// @brief Sends a query to delete data from a table.
+    ///
+    /// If creates a new audit revision for this change if such audit
+    /// revision doesn't exist yet (using ScopedAuditRevision mechanism).
+    ///
+    /// @tparam Args type of the arguments to be passed to one of the existing
+    /// @c deleteFromTable methods.
+    /// @param server_selector server selector.
+    /// @param operation operation which results in calling this function. This is
+    /// used for logging purposes.
+    /// @param log_message log message to be associated with the audit revision.
+    /// @param cascade_delete boolean flag indicating if we're performing
+    /// cascade delete. If set to true, the audit entries for the child
+    /// objects (e.g. DHCPoptions) won't be created.
+    /// @param keys arguments to be passed to one of the existing
+    /// @c deleteFromTable methods.
+    ///
+    /// @return Number of deleted entries.
+    template<typename... Args>
+    uint64_t deleteTransactional(const int index,
+                                 const db::ServerSelector& server_selector,
+                                 const std::string& operation,
+                                 const std::string& log_message,
+                                 const bool cascade_delete,
+                                 Args&&... keys) {
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, log_message, cascade_delete);
+
+        auto count = deleteFromTable(index, server_selector, operation, keys...);
+
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Sends query to delete subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    uint64_t deleteSubnet6(const ServerSelector& server_selector,
+                           const SubnetID& subnet_id) {
+        int index = (server_selector.amAny() ?
+                     PgSqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_ID_ANY :
+                     PgSqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_ID_WITH_TAG);
+        return (deleteTransactional(index, server_selector,
+                                    "deleting a subnet", "subnet deleted",
+                                    true, static_cast<uint32_t>(subnet_id)));
+    }
+
+    /// @brief Sends query to delete subnet by id.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    uint64_t deleteSubnet6(const ServerSelector& server_selector,
+                           const std::string& subnet_prefix) {
+        int index = (server_selector.amAny() ?
+                     PgSqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_PREFIX_ANY :
+                     PgSqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_PREFIX_WITH_TAG);
+        return (deleteTransactional(index, server_selector,
+                                    "deleting a subnet", "subnet deleted",
+                                    true, subnet_prefix));
+    }
+
+    /// @brief Deletes pools belonging to a subnet from the database.
+    ///
+    /// The query deletes all pools associated with the subnet's
+    /// identifier or prefix.
+    /// @param subnet Pointer to the subnet for which pools should be
+    /// deleted.
+    uint64_t deletePools6(const Subnet6Ptr& subnet) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet->getID());
+        in_bindings.addTempString(subnet->toText());
+
+        // Run DELETE.
+        return (updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::DELETE_POOLS6,
+                                  in_bindings));
+    }
+
+    /// @brief Deletes prefix delegation pools belonging to a subnet from
+    /// the database.
+    ///
+    /// The query deletes all pd pools associated with the subnet's
+    /// identifier or prefix.
+    /// @param subnet Pointer to the subnet for which pd pools should be
+    /// deleted.
+    uint64_t deletePdPools6(const Subnet6Ptr& subnet) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet->getID());
+        in_bindings.addTempString(subnet->toText());
+
+        // Run DELETE.
+        return (updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::DELETE_PD_POOLS,
+                                  in_bindings));
+    }
+
+    /// @brief Sends query to the database to retrieve multiple shared
+    /// networks.
+    ///
+    /// Query should order shared networks by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] shared_networks Reference to the container where fetched
+    /// shared networks will be inserted.
+    void getSharedNetworks6(const StatementIndex& index,
+                            const ServerSelector& server_selector,
+                            const PsqlBindArray& in_bindings,
+                            SharedNetwork6Collection& shared_networks) {
+        uint64_t last_network_id = 0;
+        uint64_t last_option_id = 0;
+        std::string last_tag;
+
+        selectQuery(index, in_bindings,
+                    [this, &shared_networks, &last_network_id, &last_option_id, &last_tag]
+                    (PgSqlResult& r, int row) {
+            // Create a convenience worker for the row.
+            PgSqlResultRowWorker worker(r, row);
+
+            SharedNetwork6Ptr last_network;
+            if (!shared_networks.empty()) {
+                last_network = *shared_networks.rbegin();
+            }
+
+            // Network id is column 0.
+            auto network_id = worker.getBigInt(0) ;
+
+            // If this is the first shared network or the shared network id in this
+            // row points to the next shared network we use the data in the
+            // row to create the new shared network instance.
+            if (last_network_id != network_id) {
+                last_network_id = network_id;
+
+                // Reset per shared network component tracking and server tag because
+                // we're now starting to process a new shared network.
+                last_option_id = 0;
+                last_tag.clear();
+
+                // name at 1.
+                last_network = SharedNetwork6::create(worker.getString(1));
+                last_network->setId(last_network_id);
+
+                // client_class at 2.
+                if (!worker.isColumnNull(2)) {
+                    last_network->allowClientClass(worker.getString(2));
+                }
+
+                // interface at 3.
+                if (!worker.isColumnNull(3)) {
+                    last_network->setIface(worker.getString(3));
+                }
+
+                // modification_ts at 4.
+                last_network->setModificationTime(worker.getTimestamp(4));
+
+                // preferred_lifetime (5)
+                // min_preferred_lifetime (32)
+                // max_preferred_lifetime (33)
+                last_network->setPreferred(worker.getTriplet(5, 32, 33));
+
+                // rapid_commit at 6.
+                if (!worker.isColumnNull(6)) {
+                    last_network->setRapidCommit(worker.getBool(6));
+                }
+
+                // rebind_timer at 7.
+                if (!worker.isColumnNull(7)) {
+                    last_network->setT2(worker.getTriplet(7));
+                }
+
+                // Relay addresses at 8.
+                setRelays(worker, 8, *last_network);
+
+                // renew_timer at 9.
+                if (!worker.isColumnNull(9)) {
+                    last_network->setT1(worker.getTriplet(9));
+                }
+
+                // require_client_classes at 10.
+                setRequiredClasses(worker, 10, [&last_network](const std::string& class_name) {
+                    last_network->requireClientClass(class_name);
+                });
+
+                // reservations_global at 11.
+                if (!worker.isColumnNull(11)) {
+                    last_network->setReservationsGlobal(worker.getBool(11));
+                }
+
+                // user_context at 12.
+                if (!worker.isColumnNull(12)) {
+                    ElementPtr user_context = worker.getJSON(12);
+                    if (user_context) {
+                        last_network->setContext(user_context);
+                    }
+                }
+
+                // valid_lifetime at 13.
+                // min_valid_lifetime at 34.
+                // max_valid_lifetime at 35.
+                if (!worker.isColumnNull(13)) {
+                    last_network->setValid(worker.getTriplet(13, 34, 35));
+                }
+
+                // option from 14 to 27.
+
+                // calculate_tee_times at 28.
+                if (!worker.isColumnNull(28)) {
+                    last_network->setCalculateTeeTimes(worker.getBool(28));
+                }
+
+                // t1_percent at 29.
+                if (!worker.isColumnNull(29)) {
+                    last_network->setT1Percent(worker.getDouble(29));
+                }
+
+                // t2_percent at 30.
+                if (!worker.isColumnNull(30)) {
+                    last_network->setT2Percent(worker.getDouble(30));
+                }
+
+                // interface_id at 31.
+                setInterfaceId(*last_network, worker, 31);
+
+                // min_preferred_lifetime at 32.
+                // max_preferred_lifetime at 33.
+                // min_valid_lifetime at 34.
+                // max_valid_lifetime at 35.
+
+                // ddns_send_updates at 36.
+                if (!worker.isColumnNull(36)) {
+                    last_network->setDdnsSendUpdates(worker.getBool(36));
+                }
+
+                // ddns_override_no_update at 37.
+                if (!worker.isColumnNull(37)) {
+                    last_network->setDdnsOverrideNoUpdate(worker.getBool(37));
+                }
+
+                // ddns_override_client_update at 38.
+                if (!worker.isColumnNull(38)) {
+                    last_network->setDdnsOverrideClientUpdate(worker.getBool(38));
+                }
+
+                // ddns_replace_client_name at 39.
+                if (!worker.isColumnNull(39)) {
+                    last_network->setDdnsReplaceClientNameMode(
+                        static_cast<D2ClientConfig::ReplaceClientNameMode>(worker.getSmallInt(39)));
+                }
+
+                // ddns_generated_prefix at 40.
+                if (!worker.isColumnNull(40)) {
+                    last_network->setDdnsGeneratedPrefix(worker.getString(40));
+                }
+
+                // ddns_qualifying_suffix at 41.
+                if (!worker.isColumnNull(41)) {
+                    last_network->setDdnsQualifyingSuffix(worker.getString(41));
+                }
+
+                // reservations_in_subnet at 42.
+                if (!worker.isColumnNull(42)) {
+                    last_network->setReservationsInSubnet(worker.getBool(42));
+                }
+
+                // reservations_in_subnet at 43.
+                if (!worker.isColumnNull(43)) {
+                    last_network->setReservationsOutOfPool(worker.getBool(43));
+                }
+
+                // cache_threshold at 44.
+                if (!worker.isColumnNull(44)) {
+                    last_network->setCacheThreshold(worker.getDouble(44));
+                }
+
+                // cache_max_age at 45.
+                if (!worker.isColumnNull(45)) {
+                    last_network->setCacheMaxAge(worker.getInt(45));
+                }
+
+                // allocator at 46.
+                if (!worker.isColumnNull(46)) {
+                    last_network->setAllocatorType(worker.getString(46));
+                }
+
+                // pd_allocator at 47.
+                if (!worker.isColumnNull(47)) {
+                    last_network->setPdAllocatorType(worker.getString(47));
+                }
+
+                // server_tag at 48.
+
+                // Add the shared network.
+                auto ret = shared_networks.push_back(last_network);
+
+                // shared_networks is a multi index container with an unique
+                // index but this index is unique too in the database,
+                // so this is for sanity only.
+                if (!ret.second) {
+                    isc_throw(Unexpected, "add shared network failed");
+                }
+            }
+
+            // Check for new server tags.
+            if (!worker.isColumnNull(48)) {
+                std::string new_tag = worker.getString(48);
+                if (last_tag != new_tag) {
+                    if (!new_tag.empty() && !last_network->hasServerTag(ServerTag(new_tag))) {
+                        last_network->setServerTag(new_tag);
+                    }
+
+                    last_tag = new_tag;
+                }
+            }
+
+            // Parse network-specific option from 14 to 27.
+            if (!worker.isColumnNull(14) &&
+                (last_option_id < worker.getBigInt(14))) {
+                last_option_id = worker.getBigInt(14);
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, worker, 14);
+                if (desc) {
+                    last_network->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        // Now that we're done fetching the whole network, we have to
+        // check if it has matching server tags and toss it if it
+        // doesn't. We skip matching the server tags if we're asking
+        // for ANY shared network.
+        auto& sn_index = shared_networks.get<SharedNetworkRandomAccessIndexTag>();
+        tossNonMatchingElements(server_selector, sn_index);
+    }
+
+    /// @brief Sends query to retrieve single shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Shared network name.
+    ///
+    /// @return Pointer to the returned shared network or NULL if such shared
+    /// network doesn't exist.
+    SharedNetwork6Ptr getSharedNetwork6(const ServerSelector& server_selector,
+                                        const std::string& name) {
+        if (server_selector.hasMultipleTags()) {
+            isc_throw(InvalidOperation, "expected one server tag to be specified"
+                      " while fetching a shared network. Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.add(name);
+
+        auto index = PgSqlConfigBackendDHCPv6Impl::GET_SHARED_NETWORK6_NAME_NO_TAG;
+        if (server_selector.amUnassigned()) {
+            index = PgSqlConfigBackendDHCPv6Impl::GET_SHARED_NETWORK6_NAME_UNASSIGNED;
+        } else if (server_selector.amAny()) {
+            index = PgSqlConfigBackendDHCPv6Impl::GET_SHARED_NETWORK6_NAME_ANY;
+        }
+
+        SharedNetwork6Collection shared_networks;
+        getSharedNetworks6(index, server_selector, in_bindings, shared_networks);
+
+        return (shared_networks.empty() ? SharedNetwork6Ptr() : *shared_networks.begin());
+    }
+
+    /// @brief Sends query to retrieve all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] shared_networks Reference to the shared networks collection
+    /// structure where shared networks should be inserted.
+    void getAllSharedNetworks6(const ServerSelector& server_selector,
+                               SharedNetwork6Collection& shared_networks) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching all shared networks for ANY "
+                      "server is not supported");
+        }
+
+        auto index = (server_selector.amUnassigned() ?
+                      PgSqlConfigBackendDHCPv6Impl::GET_ALL_SHARED_NETWORKS6_UNASSIGNED :
+                      PgSqlConfigBackendDHCPv6Impl::GET_ALL_SHARED_NETWORKS6);
+
+        PsqlBindArray in_bindings;
+        getSharedNetworks6(index, server_selector, in_bindings, shared_networks);
+    }
+
+    /// @brief Sends query to retrieve modified shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] shared_networks Reference to the shared networks collection
+    /// structure where shared networks should be inserted.
+    void getModifiedSharedNetworks6(const ServerSelector& server_selector,
+                                    const boost::posix_time::ptime& modification_ts,
+                                    SharedNetwork6Collection& shared_networks) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified shared networks for ANY "
+                      "server is not supported");
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.addTimestamp(modification_ts);
+
+        auto index = (server_selector.amUnassigned() ?
+                      PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_SHARED_NETWORKS6_UNASSIGNED :
+                      PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_SHARED_NETWORKS6);
+        getSharedNetworks6(index, server_selector, in_bindings, shared_networks);
+    }
+
+    /// @brief Sends query to insert or update shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the shared network to be inserted or updated.
+    void createUpdateSharedNetwork6(const ServerSelector& server_selector,
+                                    const SharedNetwork6Ptr& shared_network) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "creating or updating a shared network for ANY"
+                      " server is not supported");
+
+        } else if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(shared_network->getName());
+        in_bindings.addOptional(shared_network->getClientClass(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getIface(Network::Inheritance::NONE));
+        in_bindings.addTimestamp(shared_network->getModificationTime());
+        in_bindings.add(shared_network->getPreferred(Network::Inheritance::NONE));
+        in_bindings.addMin(shared_network->getPreferred(Network::Inheritance::NONE));
+        in_bindings.addMax(shared_network->getPreferred(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getRapidCommit(Network::Inheritance::NONE));
+        in_bindings.add(shared_network->getT2(Network::Inheritance::NONE));
+        addRelayBinding(in_bindings, shared_network);
+        in_bindings.add(shared_network->getT1(Network::Inheritance::NONE));
+        addRequiredClassesBinding(in_bindings, shared_network);
+        in_bindings.addOptional(shared_network->getReservationsGlobal(Network::Inheritance::NONE));
+        in_bindings.add(shared_network->getContext());
+        in_bindings.add(shared_network->getValid(Network::Inheritance::NONE));
+        in_bindings.addMin(shared_network->getValid(Network::Inheritance::NONE));
+        in_bindings.addMax(shared_network->getValid(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getCalculateTeeTimes(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getT1Percent(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getT2Percent(Network::Inheritance::NONE));
+        addInterfaceIdBinding(in_bindings, *shared_network);
+        in_bindings.addOptional(shared_network->getDdnsSendUpdates(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getDdnsOverrideNoUpdate(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getDdnsOverrideClientUpdate(Network::Inheritance::NONE));
+        addDdnsReplaceClientNameBinding(in_bindings, shared_network);
+        in_bindings.addOptional(shared_network->getDdnsGeneratedPrefix(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getDdnsQualifyingSuffix(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getReservationsInSubnet(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getReservationsOutOfPool(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getCacheThreshold(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getCacheMaxAge(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getAllocatorType(Network::Inheritance::NONE));
+        in_bindings.addOptional(shared_network->getPdAllocatorType(Network::Inheritance::NONE));
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "shared network set", true);
+
+        // Create a savepoint in case we are called as part of larger
+        // transaction.
+        conn_.createSavepoint("createUpdateSharedNetwork6");
+
+        try {
+
+            // Try to insert shared network. The shared network name must be unique,
+            // so if inserting fails with DuplicateEntry exception we'll need to
+            // update existing shared network entry.
+            insertQuery(PgSqlConfigBackendDHCPv6Impl::INSERT_SHARED_NETWORK6,
+                        in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            // It already exists, rollback to the savepoint to preserve
+            // any prior work.
+            conn_.rollbackToSavepoint("createUpdateSharedNetwork6");
+
+            // We're updating, so we need to remove any options.
+            deleteOptions6(ServerSelector::ANY(), shared_network);
+
+            // Need to add one more binding for WHERE clause.
+            in_bindings.addTempString(shared_network->getName());
+
+            // Try the update.
+            updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::UPDATE_SHARED_NETWORK6,
+                              in_bindings);
+
+            // Remove existing server association.
+            PsqlBindArray server_bindings;
+            server_bindings.addTempString(shared_network->getName());
+            updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_SERVER,
+                              server_bindings);
+        }
+
+        // Associate the shared network with the servers.
+        PsqlBindArray attach_bindings;
+        attach_bindings.addTempString(shared_network->getName());
+        attach_bindings.addTimestamp(shared_network->getModificationTime());
+        attachElementToServers(PgSqlConfigBackendDHCPv6Impl::INSERT_SHARED_NETWORK6_SERVER,
+                               server_selector, attach_bindings);
+
+        // (Re)create options.
+        auto option_spaces = shared_network->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = shared_network->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption6(server_selector, shared_network->getName(),
+                                    desc_copy, true);
+            }
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert DHCP option.
+    ///
+    /// This method expects that the server selector contains exactly one
+    /// server tag.  It is intended to be used within a transaction.
+    ///
+    /// @param server_selector Server selector.
+    /// @param in_bindings Collection of bindings representing an option.
+    /// @param modification_ts option's modification timestamp
+    void insertOption6(const ServerSelector& server_selector,
+                       const PsqlBindArray& in_bindings,
+                       const boost::posix_time::ptime& modification_ts) {
+        // Attempt the insert.
+        insertQuery(PgSqlConfigBackendDHCPv6Impl::INSERT_OPTION6, in_bindings);
+
+        // Fetch primary key value of the inserted option. We will use it in the
+        // next INSERT statement to associate this option with the server.
+        auto option_id = getLastInsertId("dhcp6_options", "option_id");
+
+        PsqlBindArray attach_bindings;
+        attach_bindings.add(option_id);   // id of newly inserted global.
+        attach_bindings.addTimestamp(modification_ts);
+
+        // Associate the option with the servers.
+        attachElementToServers(PgSqlConfigBackendDHCPv6Impl::INSERT_OPTION6_SERVER,
+                               server_selector, attach_bindings);
+    }
+
+    /// @brief Sends query to insert or update global DHCP option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const OptionDescriptorPtr& option) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        auto tag = getServerTag(server_selector, "creating or updating global option");
+
+        // Create the input parameter bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.add(option->option_->getType());
+        addOptionValueBinding(in_bindings, option);
+        in_bindings.addOptional(option->formatted_value_);
+        in_bindings.addOptional(option->space_name_);
+        in_bindings.add(option->persistent_);
+        in_bindings.add(option->cancelled_);
+        in_bindings.addNull();
+        in_bindings.addNull();
+        in_bindings.add(0);
+        in_bindings.add(option->getContext());
+        in_bindings.addNull();
+        in_bindings.addNull();
+        in_bindings.addTimestamp(option->getModificationTime());
+        in_bindings.addNull();
+
+        // Remember the size before we add where clause arguments.
+        size_t pre_where_size = in_bindings.size();
+
+        // Now we add the update where clause parameters
+        in_bindings.add(tag);
+        in_bindings.add(option->option_->getType());
+        in_bindings.addOptional(option->space_name_);
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "global option set", false);
+
+        // Try to update the option.
+        if (updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6,
+                              in_bindings) == 0) {
+            // The option doesn't exist, so we'll try to insert it.
+            // Remove the update where clause bindings.
+            while (in_bindings.size() > pre_where_size) {
+                in_bindings.popBack();
+            }
+
+            // Try to insert the option.
+            insertOption6(server_selector, in_bindings,
+                          option->getModificationTime());
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. subnet.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const SubnetID& subnet_id,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        // Create input bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.add(option->option_->getType());
+        addOptionValueBinding(in_bindings, option);
+        in_bindings.addOptional(option->formatted_value_);
+        in_bindings.addOptional(option->space_name_);
+        in_bindings.add(option->persistent_);
+        in_bindings.add(option->cancelled_);
+        in_bindings.addNull();
+        in_bindings.add(subnet_id);
+        in_bindings.add(1);
+        in_bindings.add(option->getContext());
+        in_bindings.addNull();
+        in_bindings.addNull();
+        in_bindings.addTimestamp(option->getModificationTime());
+        in_bindings.addNull();
+
+        // Remember the size before we add where clause arguments.
+        size_t pre_where_size = in_bindings.size();
+
+        // Now we add the update where clause parameters
+        in_bindings.add(subnet_id);
+        in_bindings.add(option->option_->getType());
+        in_bindings.addOptional(option->space_name_);
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "subnet specific option set",
+                           cascade_update);
+
+        // Try to update the subnet option.
+        if (updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_SUBNET_ID,
+                              in_bindings) == 0) {
+            // The option doesn't exist, so we'll try to insert it.
+            // Remove the update where clause bindings.
+            while (in_bindings.size() > pre_where_size) {
+                in_bindings.popBack();
+            }
+
+            // Try to insert the option.
+            insertOption6(server_selector, in_bindings,
+                          option->getModificationTime());
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a pool.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool.
+    /// @param pool_end_address Upper bound address of the pool.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const IOAddress& pool_start_address,
+                             const IOAddress& pool_end_address,
+                             const OptionDescriptorPtr& option) {
+        uint64_t pool_id = 0;
+        Pool6Ptr pool = getPool6(server_selector, pool_start_address, pool_end_address,
+                                 pool_id);
+        if (!pool) {
+            isc_throw(BadValue, "no pool found for range of "
+                      << pool_start_address << " : "
+                      << pool_end_address);
+        }
+
+        createUpdateOption6(server_selector, Lease::TYPE_NA,
+                            pool_id, option, false);
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a pd pool.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pd_pool_prefix Address part of the pd pool prefix.
+    /// @param pd_pool_prefix_length Length of the pd pool prefix.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const asiolink::IOAddress& pd_pool_prefix,
+                             const uint8_t pd_pool_prefix_length,
+                             const OptionDescriptorPtr& option) {
+        uint64_t pd_pool_id = 0;
+        Pool6Ptr pd_pool = getPdPool6(server_selector,
+                                      pd_pool_prefix,
+                                      pd_pool_prefix_length,
+                                      pd_pool_id);
+        if (!pd_pool) {
+            isc_throw(BadValue, "no prefix delegation pool found for prefix "
+                      << "of " << pd_pool_prefix << "/"
+                      << static_cast<unsigned>(pd_pool_prefix_length));
+        }
+
+        createUpdateOption6(server_selector, Lease::TYPE_PD,
+                            pd_pool_id, option, false);
+    }
+
+    /// @brief Sends query to insert or update DHCP option in an address
+    /// or prefix delegation pool.
+    ///
+    /// @param selector Server selector.
+    /// @param pool_type Pool type (Lease::TYPE_NA or Lease::TYPE_PD).
+    /// @param pool_id Identifier of the address or prefix delegation pool
+    /// the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. subnet.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const Lease::Type& pool_type,
+                             const uint64_t pool_id,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        std::string msg = "creating or updating ";
+        if (pool_type == Lease::TYPE_PD) {
+            msg += "prefix delegation";
+        } else {
+            msg += "address";
+        }
+        msg += " pool level option";
+
+        PsqlBindArray in_bindings;
+
+        in_bindings.add(option->option_->getType());
+        addOptionValueBinding(in_bindings, option);
+        in_bindings.addOptional(option->formatted_value_);
+        in_bindings.addOptional(option->space_name_);
+        in_bindings.add(option->persistent_);
+        in_bindings.add(option->cancelled_);
+        in_bindings.addNull();
+        in_bindings.addNull();
+
+        // scope_id
+        if (pool_type == Lease::TYPE_NA) {
+            in_bindings.add(5);
+        } else {
+            in_bindings.add(6);
+        }
+
+        in_bindings.add(option->getContext());
+        in_bindings.addNull();
+
+        // pool_id
+        if (pool_type == Lease::TYPE_NA) {
+            in_bindings.add(pool_id);
+        } else {
+            in_bindings.addNull();
+        }
+
+        in_bindings.addTimestamp(option->getModificationTime());
+
+        // pd_pool_id
+        if (pool_type == Lease::TYPE_PD) {
+            in_bindings.add(pool_id);
+        } else {
+            in_bindings.addNull();
+        }
+
+        // Remember the size before we add where clause arguments.
+        size_t pre_where_size = in_bindings.size();
+
+        // Now we add the update where clause parameters
+        in_bindings.add(pool_id);
+        in_bindings.add(option->option_->getType());
+        in_bindings.addOptional(option->space_name_);
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        if (pool_type == Lease::TYPE_PD) {
+            msg = "prefix delegation";
+        } else {
+            msg = "address";
+        }
+        msg += " pool specific option set";
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, msg, cascade_update);
+
+        auto index = (pool_type == Lease::TYPE_NA ?
+                      PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_POOL_ID :
+                      PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_PD_POOL_ID);
+
+        // Try to update the option.
+        if (updateDeleteQuery(index, in_bindings) == 0) {
+            // The option doesn't exist, so we'll try to insert it.
+            // Remove the update where clause bindings.
+            while (in_bindings.size() > pre_where_size) {
+                in_bindings.popBack();
+            }
+
+            // Try to insert the option.
+            insertOption6(server_selector, in_bindings,
+                          option->getModificationTime());
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a shared network.
+    ///
+    /// @param selector Server selector.
+    /// @param shared_network_name Name of the shared network the option
+    /// belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option.
+    /// @param cascade_update Boolean value indicating whether the update is
+    /// performed as part of the owning element, e.g. shared network.
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const std::string& shared_network_name,
+                             const OptionDescriptorPtr& option,
+                             const bool cascade_update) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        // Create input bindings.
+        PsqlBindArray in_bindings;
+        in_bindings.add(option->option_->getType());
+        addOptionValueBinding(in_bindings, option);
+        in_bindings.addOptional(option->formatted_value_);
+        in_bindings.addOptional(option->space_name_);
+        in_bindings.add(option->persistent_);
+        in_bindings.add(option->cancelled_);
+        in_bindings.addNull();
+        in_bindings.addNull();
+        in_bindings.add(4);
+        in_bindings.add(option->getContext());
+        in_bindings.add(shared_network_name);
+        in_bindings.addNull();
+        in_bindings.addTimestamp(option->getModificationTime());
+        in_bindings.addNull();
+
+        // Remember the size before we add where clause arguments.
+        size_t pre_where_size = in_bindings.size();
+
+        // Now we add the update where clause parameters
+        in_bindings.add(shared_network_name);
+        in_bindings.add(option->option_->getType());
+        in_bindings.addOptional(option->space_name_);
+
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "shared network specific option set",
+                           cascade_update);
+
+        // Try to update the option.
+        if (updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_SHARED_NETWORK,
+                              in_bindings) == 0) {
+            // The option doesn't exist, so we'll try to insert it.
+            // Remove the update where clause bindings.
+            while (in_bindings.size() > pre_where_size) {
+                in_bindings.popBack();
+            }
+
+            // Try to insert the option.
+            insertOption6(server_selector, in_bindings,
+                          option->getModificationTime());
+        }
+
+        // Commit the work.
+        transaction.commit();
+    }
+
+    /// @brief Sends query to insert or update DHCP option in a client class.
+    ///
+    /// @param selector Server selector.
+    /// @param client_class Pointer to the client_class the option belongs to.
+    /// @param option Pointer to the option descriptor encapsulating the option..
+    void createUpdateOption6(const ServerSelector& server_selector,
+                             const ClientClassDefPtr& client_class,
+                             const OptionDescriptorPtr& option) {
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "managing configuration for no particular server"
+                      " (unassigned) is unsupported at the moment");
+        }
+
+        PsqlBindArray in_bindings;
+        std::string class_name = client_class->getName();
+        in_bindings.add(option->option_->getType());
+        addOptionValueBinding(in_bindings, option);
+        in_bindings.addOptional(option->formatted_value_);
+        in_bindings.addOptional(option->space_name_);
+        in_bindings.add(option->persistent_);
+        in_bindings.add(option->cancelled_);
+        in_bindings.add(class_name);
+        in_bindings.addNull();
+        in_bindings.add(2);
+        in_bindings.add(option->getContext());
+        in_bindings.addNull();
+        in_bindings.addNull();
+        in_bindings.addTimestamp(option->getModificationTime());
+        in_bindings.addNull();
+
+        // Remember the size before we add where clause arguments.
+        size_t pre_where_size = in_bindings.size();
+
+        // Now we add the update where clause parameters
+        in_bindings.add(class_name);
+        in_bindings.add(option->option_->getType());
+        in_bindings.addOptional(option->space_name_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this,
+                           PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           server_selector, "client class specific option set",
+                           true);
+
+        if (updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_CLIENT_CLASS,
+                              in_bindings) == 0) {
+            // The option doesn't exist, so we'll try to insert it.
+            // Remove the update where clause bindings.
+            while (in_bindings.size() > pre_where_size) {
+                in_bindings.popBack();
+            }
+
+            insertOption6(server_selector, in_bindings,
+                          option->getModificationTime());
+        }
+    }
+
+    /// @brief Sends query to insert or update option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Pointer to the option definition to be inserted or updated.
+    void createUpdateOptionDef6(const ServerSelector& server_selector,
+                                const OptionDefinitionPtr& option_def) {
+        createUpdateOptionDef(server_selector, Option::V6, option_def, DHCP6_OPTION_SPACE,
+                              PgSqlConfigBackendDHCPv6Impl::GET_OPTION_DEF6_CODE_SPACE,
+                              PgSqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6,
+                              PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION_DEF6,
+                              PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                              PgSqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6_SERVER);
+    }
+
+    /// @brief Sends query to insert or update option definition
+    /// for a client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Pointer to the option definition to be inserted or updated.
+    /// @param client_class Client class name.
+    void createUpdateOptionDef6(const ServerSelector& server_selector,
+                                const OptionDefinitionPtr& option_def,
+                                const std::string& client_class_name) {
+        createUpdateOptionDef(server_selector, Option::V6, option_def, DHCP6_OPTION_SPACE,
+                              PgSqlConfigBackendDHCPv6Impl::GET_OPTION_DEF6_CODE_SPACE,
+                              PgSqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6_CLIENT_CLASS,
+                              PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION_DEF6_CLIENT_CLASS,
+                              PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                              PgSqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6_SERVER,
+                              client_class_name);
+    }
+
+    /// @brief Sends query to delete option definition by code and
+    /// option space name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Option code.
+    /// @param name Option name.
+    /// @return Number of deleted option definitions.
+    uint64_t deleteOptionDef6(const ServerSelector& server_selector,
+                              const uint16_t code,
+                              const std::string& space) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(code);
+        in_bindings.add(space);
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION_DEF6_CODE_NAME,
+                                    server_selector,
+                                    "deleting option definition",
+                                    "option definition deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Sends query to delete option definitions for a client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the client class for which option
+    /// definitions should be deleted.
+    /// @return Number of deleted option definitions.
+    uint64_t deleteOptionDefs6(const ServerSelector& server_selector,
+                               const ClientClassDefPtr& client_class) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(client_class->getName());
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION_DEFS6_CLIENT_CLASS,
+                                    server_selector,
+                                    "deleting option definition for a client class",
+                                    "option definition deleted",
+                                    true,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption6(const ServerSelector& server_selector,
+                           const uint16_t code,
+                           const std::string& space) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(code);
+        in_bindings.add(space);
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION6,
+                                    server_selector,
+                                    "deleting global option",
+                                    "global option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to which deleted option
+    /// belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption6(const ServerSelector& server_selector,
+                           const SubnetID& subnet_id,
+                           const uint16_t code,
+                           const std::string& space) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet_id);
+        in_bindings.add(code);
+        in_bindings.add(space);
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION6_SUBNET_ID,
+                                    server_selector,
+                                    "deleting option for a subnet",
+                                    "subnet specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound pool address.
+    /// @param pool_end_address  Upper bound pool address.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption6(const db::ServerSelector& server_selector,
+                           const IOAddress& pool_start_address,
+                           const IOAddress& pool_end_address,
+                           const uint16_t code,
+                           const std::string& space) {
+        PsqlBindArray in_bindings;
+        in_bindings.addInet6(pool_start_address);
+        in_bindings.addInet6(pool_end_address);
+        in_bindings.add(code);
+        in_bindings.add(space);
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION6_POOL_RANGE,
+                                    server_selector,
+                                    "deleting option for an address pool",
+                                    "address pool specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes pd pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pd_pool_prefix Address part of the pd pool prefix.
+    /// @param pd_pool_prefix_length Length of the pd pool prefix.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption6(const db::ServerSelector& server_selector,
+                           const asiolink::IOAddress& pd_pool_prefix,
+                           const uint8_t pd_pool_prefix_length,
+                           const uint16_t code,
+                           const std::string& space) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(pd_pool_prefix.toText());
+        in_bindings.add(pd_pool_prefix_length);
+        in_bindings.add(code);
+        in_bindings.add(space);
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION6_PD_POOL,
+                                    server_selector,
+                                    "deleting option for a prefix delegation pool",
+                                    "prefix delegation pool specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network which deleted
+    /// option belongs to
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    uint64_t deleteOption6(const db::ServerSelector& server_selector,
+                           const std::string& shared_network_name,
+                           const uint16_t code,
+                           const std::string& space) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(shared_network_name);
+        in_bindings.add(code);
+        in_bindings.add(space);
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION6_SHARED_NETWORK,
+                                    server_selector,
+                                    "deleting option for a shared network",
+                                    "shared network specific option deleted",
+                                    false,
+                                    in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a subnet from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet for which options should be
+    /// deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions6(const ServerSelector& server_selector,
+                            const Subnet6Ptr& subnet) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(subnet->getID());
+        in_bindings.addTempString(subnet->toText());
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_OPTIONS6_SUBNET_ID_PREFIX,
+                                    server_selector,
+                                    "deleting options for a subnet",
+                                    "subnet specific options deleted",
+                                    true, in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a shared network from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Pointer to the subnet for which options should be
+    /// deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions6(const ServerSelector& server_selector,
+                            const SharedNetwork6Ptr& shared_network) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(shared_network->getName());
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv6Impl::
+                                    DELETE_OPTIONS6_SHARED_NETWORK, server_selector,
+                                    "deleting options for a shared network",
+                                    "shared network specific options deleted",
+                                    true, in_bindings));
+    }
+
+    /// @brief Deletes options belonging to a client class from the database.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the client class for which options
+    /// should be deleted.
+    /// @return Number of deleted options.
+    uint64_t deleteOptions6(const ServerSelector& server_selector,
+                            const ClientClassDefPtr& client_class) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(client_class->getName());
+
+        // Run DELETE.
+        return (deleteTransactional(PgSqlConfigBackendDHCPv6Impl::
+                                    DELETE_OPTIONS6_CLIENT_CLASS, server_selector,
+                                    "deleting options for a client class",
+                                    "client class specific options deleted",
+                                    true, in_bindings));
+    }
+
+    /// @brief Common function to retrieve client classes.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] client_classes Reference to a container where fetched client
+    /// classes will be inserted.
+    void getClientClasses6(const StatementIndex& index,
+                           const ServerSelector& server_selector,
+                           const PsqlBindArray& in_bindings,
+                           ClientClassDictionary& client_classes) {
+        std::list<ClientClassDefPtr> class_list;
+        uint64_t last_option_id = 0;
+        uint64_t last_option_def_id = 0;
+        std::string last_tag;
+
+        selectQuery(index, in_bindings,
+                    [this, &class_list, &last_option_id, &last_option_def_id, &last_tag]
+                    (PgSqlResult& r, int row) {
+            // Create a convenience worker for the row.
+            PgSqlResultRowWorker worker(r, row);
+
+            ClientClassDefPtr last_client_class;
+            if (!class_list.empty()) {
+                last_client_class = *class_list.rbegin();
+            }
+
+            // Class ID is column 0.
+            uint64_t id = worker.getBigInt(0) ;
+
+            if (!last_client_class || (last_client_class->getId() != id)) {
+                last_option_id = 0;
+                last_option_def_id = 0;
+                last_tag.clear();
+
+                auto options = boost::make_shared<CfgOption>();
+                auto option_defs = boost::make_shared<CfgOptionDef>();
+
+                last_client_class = boost::make_shared<ClientClassDef>(worker.getString(1),
+                                                                       ExpressionPtr(), options);
+                last_client_class->setCfgOptionDef(option_defs);
+
+                // id
+                last_client_class->setId(id);
+
+                // name
+                last_client_class->setName(worker.getString(1));
+
+                // test
+                if (!worker.isColumnNull(2)) {
+                    last_client_class->setTest(worker.getString(2));
+                }
+
+                // required
+                if (!worker.isColumnNull(3)) {
+                    last_client_class->setRequired(worker.getBool(3));
+                }
+
+                // valid lifetime: default, min, max
+                last_client_class->setValid(worker.getTriplet(4, 5, 6));
+
+                // depend on known directly or indirectly
+                last_client_class->setDependOnKnown(worker.getBool(7) || worker.getBool(8));
+
+                // modification_ts
+                last_client_class->setModificationTime(worker.getTimestamp(9));
+
+                // user_context at 10.
+                if (!worker.isColumnNull(10)) {
+                    ElementPtr user_context = worker.getJSON(10);
+                    if (user_context) {
+                        last_client_class->setContext(user_context);
+                    }
+                }
+
+                // class specific option definition from 11 to 20.
+                // class specific option from 21 to 33.
+
+                // preferred lifetime: default, min, max
+                last_client_class->setPreferred(worker.getTriplet(35, 36, 37));
+
+                class_list.push_back(last_client_class);
+            }
+
+            // Check for new server tags at 34.
+            if (!worker.isColumnNull(34)) {
+                std::string new_tag = worker.getString(34);
+                if (last_tag != new_tag) {
+                    if (!new_tag.empty() && !last_client_class->hasServerTag(ServerTag(new_tag))) {
+                        last_client_class->setServerTag(new_tag);
+                    }
+
+                    last_tag = new_tag;
+                }
+            }
+
+            // Parse client class specific option definition from 11 to 20.
+            if (!worker.isColumnNull(11) &&
+                (last_option_def_id < worker.getBigInt(11))) {
+                last_option_def_id = worker.getBigInt(11);
+
+                auto def = processOptionDefRow(worker, 11);
+                if (def) {
+                    last_client_class->getCfgOptionDef()->add(def);
+                }
+            }
+
+            // Parse client class specific option from 21 to 33.
+            if (!worker.isColumnNull(21) &&
+                (last_option_id < worker.getBigInt(21))) {
+                last_option_id = worker.getBigInt(21);
+
+                OptionDescriptorPtr desc = processOptionRow(Option::V6, worker, 21);
+                if (desc) {
+                    last_client_class->getCfgOption()->add(*desc, desc->space_name_);
+                }
+            }
+        });
+
+        tossNonMatchingElements(server_selector, class_list);
+
+        for (auto c : class_list) {
+            client_classes.addClass(c);
+        }
+    }
+
+    /// @brief Sends query to retrieve a client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the class to be retrieved.
+    /// @return Pointer to the client class or null if the class is not found.
+    ClientClassDefPtr getClientClass6(const ServerSelector& server_selector,
+                                      const std::string& name) {
+        PsqlBindArray in_bindings;
+        in_bindings.add(name);
+
+        ClientClassDictionary client_classes;
+        getClientClasses6(PgSqlConfigBackendDHCPv6Impl::GET_CLIENT_CLASS6_NAME,
+                          server_selector, in_bindings, client_classes);
+        return (client_classes.getClasses()->empty() ? ClientClassDefPtr() :
+                (*client_classes.getClasses()->begin()));
+    }
+
+    /// @brief Sends query to retrieve all client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @param [out] client_classes Reference to the client classes collection
+    /// where retrieved classes will be stored.
+    void getAllClientClasses6(const ServerSelector& server_selector,
+                              ClientClassDictionary& client_classes) {
+        PsqlBindArray in_bindings;
+        getClientClasses6(server_selector.amUnassigned() ?
+                          PgSqlConfigBackendDHCPv6Impl::GET_ALL_CLIENT_CLASSES6_UNASSIGNED :
+                          PgSqlConfigBackendDHCPv6Impl::GET_ALL_CLIENT_CLASSES6,
+                          server_selector, in_bindings, client_classes);
+    }
+
+    /// @brief Sends query to retrieve modified client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_ts Lower bound modification timestamp.
+    /// @param [out] client_classes Reference to the client classes collection
+    /// where retrieved classes will be stored.
+    void getModifiedClientClasses6(const ServerSelector& server_selector,
+                                   const boost::posix_time::ptime& modification_ts,
+                                   ClientClassDictionary& client_classes) {
+        if (server_selector.amAny()) {
+            isc_throw(InvalidOperation, "fetching modified client classes for ANY "
+                      "server is not supported");
+        }
+
+        PsqlBindArray in_bindings;
+        in_bindings.addTimestamp(modification_ts);
+        getClientClasses6(server_selector.amUnassigned() ?
+                          PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_CLIENT_CLASSES6_UNASSIGNED :
+                          PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_CLIENT_CLASSES6,
+                          server_selector, in_bindings, client_classes);
+    }
+
+    /// @brief Upserts client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Pointer to the upserted client class.
+    /// @param follow_class_name name of the class after which the
+    /// new or updated class should be positioned. An empty value
+    /// causes the class to be appended at the end of the class
+    /// hierarchy.
+    void createUpdateClientClass6(const ServerSelector& server_selector,
+                                  const ClientClassDefPtr& client_class,
+                                  const std::string& follow_class_name) {
+        // We need to evaluate class expression to see if it references any
+        // other classes (dependencies). As part of this evaluation we will
+        // also check if the client class depends on KNOWN/UNKNOWN built-in
+        // classes.
+        std::list<std::string> dependencies;
+        auto depend_on_known = false;
+        if (!client_class->getTest().empty()) {
+            ExpressionPtr expression;
+            ExpressionParser parser;
+            // Parse the test expression. The callback function is normally used to
+            // interrupt config file parsing when one of the classes refers to a
+            // non-existing client class. It returns false in this case. Here,
+            // we use the callback to capture client classes referenced by the
+            // upserted client class and record whether this class depends on
+            // KNOWN/UNKNOWN built-ins. The callback always returns true to avoid
+            // reporting the parsing error. The dependency check is performed later
+            // at the database level.
+            parser.parse(expression, Element::create(client_class->getTest()), AF_INET6,
+                         [&dependencies, &depend_on_known](const ClientClass& client_class) -> bool {
+                if (isClientClassBuiltIn(client_class)) {
+                    if ((client_class == "KNOWN") || (client_class == "UNKNOWN")) {
+                        depend_on_known = true;
+                    }
+                } else {
+                    dependencies.push_back(client_class);
+                }
+                return (true);
+            });
+        }
+
+        PsqlBindArray in_bindings;
+        std::string class_name = client_class->getName();
+        in_bindings.add(class_name);
+        in_bindings.addTempString(client_class->getTest());
+        in_bindings.add(client_class->getRequired());
+        in_bindings.add(client_class->getValid());
+        in_bindings.add(client_class->getValid().getMin());
+        in_bindings.add(client_class->getValid().getMax());
+        in_bindings.add(depend_on_known);
+
+        // follow-class-name (8)
+        if (follow_class_name.empty()) {
+            in_bindings.addNull();
+        } else {
+            in_bindings.add(follow_class_name);
+        }
+
+        in_bindings.add(client_class->getPreferred());
+        in_bindings.add(client_class->getPreferred().getMin());
+        in_bindings.add(client_class->getPreferred().getMax());
+        in_bindings.addTimestamp(client_class->getModificationTime());
+        in_bindings.add(client_class->getContext());
+
+        PgSqlTransaction transaction(conn_);
+
+        ScopedAuditRevision audit_revision(this, PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                                           server_selector, "client class set", true);
+
+        // Create a savepoint in case we are called as part of larger
+        // transaction.
+        conn_.createSavepoint("createUpdateClass6");
+
+        // Keeps track of whether the client class is inserted or updated.
+        auto update = false;
+        try {
+            insertQuery(PgSqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6, in_bindings);
+
+        } catch (const DuplicateEntry&) {
+            // It already exists, rollback to the savepoint to preserve
+            // any prior work.
+            conn_.rollbackToSavepoint("createUpdateClass6");
+
+            // Delete options and option definitions. They will be re-created from the new class
+            // instance.
+            deleteOptions6(ServerSelector::ANY(), client_class);
+            deleteOptionDefs6(ServerSelector::ANY(), client_class);
+
+            // Note: follow_class_name is left in the bindings even though it is
+            // not needed in both cases. This allows us to use one base query.
+
+            // Add the class name for the where clause.
+            in_bindings.add(class_name);
+            if (follow_class_name.empty()) {
+                // If position is not specified, leave the class at the same position.
+                updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::UPDATE_CLIENT_CLASS6_SAME_POSITION,
+                                  in_bindings);
+            } else {
+                // Update with follow_class_name specifying the position.
+                updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::UPDATE_CLIENT_CLASS6,
+                                  in_bindings);
+            }
+
+            // Delete class associations with the servers and dependencies. We will re-create
+            // them according to the new class specification.
+            PsqlBindArray in_assoc_bindings;
+            in_assoc_bindings.add(class_name);
+            updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_DEPENDENCY,
+                              in_assoc_bindings);
+            updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_SERVER,
+                              in_assoc_bindings);
+            update = true;
+        }
+
+        // Associate client class with the servers.
+        PsqlBindArray attach_bindings;
+        attach_bindings.add(class_name);
+        attach_bindings.addTimestamp(client_class->getModificationTime());
+
+        attachElementToServers(PgSqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6_SERVER,
+                               server_selector, attach_bindings);
+
+        // Iterate over the captured dependencies and try to insert them into the database.
+        for (auto dependency : dependencies) {
+            try {
+                PsqlBindArray in_dependency_bindings;
+                in_dependency_bindings.add(class_name);
+                in_dependency_bindings.add(dependency);
+
+                // We deleted earlier dependencies, so we can simply insert new ones.
+                insertQuery(PgSqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6_DEPENDENCY,
+                            in_dependency_bindings);
+            } catch (const std::exception& ex) {
+                isc_throw(InvalidOperation, "unmet dependency on client class: " << dependency);
+            }
+        }
+
+        // If we performed client class update we also have to verify that its dependency
+        // on KNOWN/UNKNOWN client classes hasn't changed.
+        if (update) {
+            PsqlBindArray in_check_bindings;
+            insertQuery(PgSqlConfigBackendDHCPv6Impl::CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+                              in_check_bindings);
+        }
+
+        // (Re)create option definitions.
+        if (client_class->getCfgOptionDef()) {
+            auto option_defs = client_class->getCfgOptionDef()->getContainer();
+            auto option_spaces = option_defs.getOptionSpaceNames();
+            for (auto option_space : option_spaces) {
+                OptionDefContainerPtr defs = option_defs.getItems(option_space);
+                for (auto def = defs->begin(); def != defs->end(); ++def) {
+                    createUpdateOptionDef6(server_selector, *def, client_class->getName());
+                }
+            }
+        }
+
+        // (Re)create options.
+        auto option_spaces = client_class->getCfgOption()->getOptionSpaceNames();
+        for (auto option_space : option_spaces) {
+            OptionContainerPtr options = client_class->getCfgOption()->getAll(option_space);
+            for (auto desc = options->begin(); desc != options->end(); ++desc) {
+                OptionDescriptorPtr desc_copy = OptionDescriptor::create(*desc);
+                desc_copy->space_name_ = option_space;
+                createUpdateOption6(server_selector, client_class, desc_copy);
+            }
+        }
+
+        // All ok. Commit the transaction.
+        transaction.commit();
+    }
+
+    /// @brief Removes client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Removed client class name.
+    /// @return Number of deleted client classes.
+    uint64_t deleteClientClass6(const ServerSelector& server_selector,
+                                const std::string& name) {
+        int index = server_selector.amAny() ?
+            PgSqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_ANY :
+            PgSqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6;
+
+        uint64_t result = deleteTransactional(index, server_selector,
+                                              "deleting client class",
+                                              "client class deleted",
+                                              true,
+                                              name);
+        return (result);
+    }
+
+    /// @brief Removes unassigned global parameters, global options and
+    /// option definitions.
+    ///
+    /// This function is called when one or more servers are deleted and
+    /// it is likely that there are some orphaned configuration elements
+    /// left in the database. This method removes those elements.
+    void purgeUnassignedConfig() {
+        multipleUpdateDeleteQueries(DELETE_ALL_GLOBAL_PARAMETERS6_UNASSIGNED,
+                                    DELETE_ALL_GLOBAL_OPTIONS6_UNASSIGNED,
+                                    DELETE_ALL_OPTION_DEFS6_UNASSIGNED);
+    }
+
+    /// @brief Attempts to delete a server having a given tag.
+    ///
+    /// @param server_tag Tag of the server to be deleted.
+    /// @return Number of deleted servers.
+    /// @throw isc::InvalidOperation when trying to delete the logical
+    /// server 'all'.
+    uint64_t deleteServer6(const data::ServerTag& server_tag) {
+        // It is not allowed to delete 'all' logical server.
+        if (server_tag.amAll()) {
+            isc_throw(InvalidOperation, "'all' is a name reserved for the server tag which"
+                      " associates the configuration elements with all servers connecting"
+                      " to the database and may not be deleted");
+        }
+
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this, PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           ServerSelector::ALL(), "deleting a server", false);
+
+        // Specify which server should be deleted.
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(server_tag.get());
+
+        // Attempt to delete the server.
+        auto count = updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::DELETE_SERVER6,
+                                       in_bindings);
+
+        // If we have deleted any servers we have to remove any dangling global
+        // parameters, options and option definitions.
+        if (count > 0) {
+            purgeUnassignedConfig();
+        }
+
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Attempts to delete all servers.
+    ///
+    /// This method deletes all servers added by the user. It does not
+    /// delete the logical server 'all'.
+    ///
+    /// @return Number of deleted servers.
+    uint64_t deleteAllServers6() {
+        // Start transaction.
+        PgSqlTransaction transaction(conn_);
+
+        // Create scoped audit revision. As long as this instance exists
+        // no new audit revisions are created in any subsequent calls.
+        ScopedAuditRevision
+            audit_revision(this, PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                           ServerSelector::ALL(), "deleting all servers",
+                           false);
+
+        // No arguments, hence empty input bindings.
+        PsqlBindArray in_bindings;
+
+        // Attempt to delete the servers.
+        auto count = updateDeleteQuery(PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SERVERS6,
+                                       in_bindings);
+
+        // If we have deleted any servers we have to remove any dangling global
+        // parameters, options and option definitions.
+        if (count > 0) {
+            purgeUnassignedConfig();
+        }
+
+        // Commit the transaction.
+        transaction.commit();
+
+        return (count);
+    }
+
+    /// @brief Attempts to reconnect the server to the config DB backend manager.
+    ///
+    /// This is a self-rescheduling function that attempts to reconnect to the
+    /// server's config DB backends after connectivity to one or more have been
+    /// lost. Upon entry it will attempt to reconnect via
+    /// @ref ConfigBackendDHCPv6Mgr.addBackend.
+    /// If this is successful, DHCP servicing is re-enabled and server returns
+    /// to normal operation.
+    ///
+    /// If reconnection fails and the maximum number of retries has not been
+    /// exhausted, it will schedule a call to itself to occur at the
+    /// configured retry interval. DHCP service remains disabled.
+    ///
+    /// If the maximum number of retries has been exhausted an error is logged
+    /// and the server shuts down.
+    ///
+    /// @param db_reconnect_ctl pointer to the ReconnectCtl containing the
+    /// configured reconnect parameters.
+    /// @return true if connection has been recovered, false otherwise.
+    static bool dbReconnect(ReconnectCtlPtr db_reconnect_ctl) {
+        MultiThreadingCriticalSection cs;
+
+        // Invoke application layer connection lost callback.
+        if (!DatabaseConnection::invokeDbLostCallback(db_reconnect_ctl)) {
+            return (false);
+        }
+
+        bool reopened = false;
+
+        const std::string timer_name = db_reconnect_ctl->timerName();
+
+        // At least one connection was lost.
+        try {
+            auto srv_cfg = CfgMgr::instance().getCurrentCfg();
+            auto config_ctl = srv_cfg->getConfigControlInfo();
+            // Iterate over the configured DBs and instantiate them.
+            for (auto db : config_ctl->getConfigDatabases()) {
+                const std::string& access = db.getAccessString();
+                auto parameters = db.getParameters();
+                if (ConfigBackendDHCPv6Mgr::instance().delBackend(parameters["type"], access, true)) {
+                    ConfigBackendDHCPv6Mgr::instance().addBackend(db.getAccessString());
+                }
+            }
+
+            reopened = true;
+        } catch (const std::exception& ex) {
+            LOG_ERROR(pgsql_cb_logger, PGSQL_CB_RECONNECT_ATTEMPT_FAILED6)
+                    .arg(ex.what());
+        }
+
+        if (reopened) {
+            // Cancel the timer.
+            if (TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                TimerMgr::instance()->unregisterTimer(timer_name);
+            }
+
+            // Invoke application layer connection recovered callback.
+            if (!DatabaseConnection::invokeDbRecoveredCallback(db_reconnect_ctl)) {
+                return (false);
+            }
+        } else {
+            if (!db_reconnect_ctl->checkRetries()) {
+                // We're out of retries, log it and initiate shutdown.
+                LOG_ERROR(pgsql_cb_logger, PGSQL_CB_RECONNECT_FAILED6)
+                        .arg(db_reconnect_ctl->maxRetries());
+
+                // Cancel the timer.
+                if (TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                    TimerMgr::instance()->unregisterTimer(timer_name);
+                }
+
+                // Invoke application layer connection failed callback.
+                DatabaseConnection::invokeDbFailedCallback(db_reconnect_ctl);
+
+                return (false);
+            }
+
+            LOG_INFO(pgsql_cb_logger, PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6)
+                    .arg(db_reconnect_ctl->maxRetries() - db_reconnect_ctl->retriesLeft() + 1)
+                    .arg(db_reconnect_ctl->maxRetries())
+                    .arg(db_reconnect_ctl->retryInterval());
+
+            // Start the timer.
+            if (!TimerMgr::instance()->isTimerRegistered(timer_name)) {
+                TimerMgr::instance()->registerTimer(timer_name,
+                    std::bind(&PgSqlConfigBackendDHCPv6Impl::dbReconnect, db_reconnect_ctl),
+                              db_reconnect_ctl->retryInterval(),
+                              asiolink::IntervalTimer::ONE_SHOT);
+            }
+            TimerMgr::instance()->setup(timer_name);
+        }
+
+        return (true);
+    }
+
+    /// @brief Sets a Network6 interface ID from result set col.
+    ///
+    /// Sets the interface id of the Network6 to the value carried in the
+    /// given column in a result set row.
+    ///
+    /// @param network shared network or subnet to receive the interface ID
+    /// @param worker result set row worker contain the database row
+    /// @param col column within the row from which to take the value
+    void setInterfaceId(Network6& network, PgSqlResultRowWorker& worker, size_t col) {
+        if (!worker.isColumnNull(col)) {
+            std::vector<uint8_t> iface_id_data;
+            worker.getBytes(col, iface_id_data);
+            if (!iface_id_data.empty()) {
+                OptionPtr opt_iface_id(new Option(Option::V6, D6O_INTERFACE_ID, iface_id_data));
+                network.setInterfaceId(opt_iface_id);
+            }
+        }
+    }
+
+    /// @brief Adds network interface ID to a bind array.
+    ///
+    /// Adds the interface id to end of the given bind array as a vector of bytes.
+    ///
+    /// @param bindings PsqlBindArray to which the ID should be added.
+    /// @param network Pointer to shared network or subnet for which ID binding
+    /// should be created.
+    void addInterfaceIdBinding(PsqlBindArray& bindings, const Network6& network) {
+        auto opt_iface_id = network.getInterfaceId(Network::Inheritance::NONE);
+        if (!opt_iface_id) {
+            bindings.addNull();
+        } else {
+            auto iface_id_data = opt_iface_id->getData();
+            if (iface_id_data.empty()) {
+                bindings.addNull();
+            } else {
+                bindings.addTempBinary(iface_id_data);
+            }
+        }
+    }
+
+};
+
+namespace {
+
+/// @brief Array of tagged statements.
+typedef std::array<PgSqlTaggedStatement, PgSqlConfigBackendDHCPv6Impl::NUM_STATEMENTS>
+TaggedStatementArray;
+
+/// @brief Prepared PgSQL statements used by the backend to insert and
+/// retrieve data from the database. They must be in the same order as
+/// PgSqlConfigBackendDHCPv6Impl::StatementIndex.  The statement is
+/// the corresponding enum name.
+TaggedStatementArray tagged_statements = { {
+    {
+        // PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+        4,
+        {
+            OID_TIMESTAMP,  // 1 audit_ts
+            OID_VARCHAR,    // 2 server_tag
+            OID_TEXT,       // 3 audit_log_message
+            OID_BOOL        // 4 cascade_transaction
+        },
+        "CREATE_AUDIT_REVISION",
+        "select createAuditRevisionDHCP6($1, $2, $3, $4)"
+    },
+
+    // Verify that dependency on KNOWN/UNKNOWN class has not changed.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE,
+        0,
+        {
+            OID_NONE
+        },
+        "CHECK_CLIENT_CLASS_KNOWN_DEPENDENCY_CHANGE",
+        "select checkDHCPv6ClientClassKnownDependencyChange()"
+    },
+
+    // Select global parameter by name.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_GLOBAL_PARAMETER6,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR     // 2 name
+        },
+        "GET_GLOBAL_PARAMETER6",
+        PGSQL_GET_GLOBAL_PARAMETER(dhcp6, AND g.name = $2)
+    },
+
+    // Select all global parameters.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_ALL_GLOBAL_PARAMETERS6,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "GET_ALL_GLOBAL_PARAMETERS6",
+        PGSQL_GET_GLOBAL_PARAMETER(dhcp6)
+    },
+
+    // Select modified global parameters.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_GLOBAL_PARAMETERS6,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_TIMESTAMP   // 2 modification_ts
+        },
+        "GET_MODIFIED_GLOBAL_PARAMETERS6",
+        PGSQL_GET_GLOBAL_PARAMETER(dhcp6, AND g.modification_ts >= $2)
+    },
+
+    // Select subnet by id.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_SUBNET6_ID_NO_TAG,
+        1,
+        {
+            OID_INT8    // 1 subnet_id
+        },
+        "GET_SUBNET6_ID_NO_TAG",
+        PGSQL_GET_SUBNET6_NO_TAG(WHERE s.subnet_id = $1)
+    },
+
+    // Select subnet by id without specifying server tags.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_SUBNET6_ID_ANY,
+        1,
+        {
+            OID_INT8    // 1 subnet_id
+        },
+        "GET_SUBNET6_ID_ANY",
+        PGSQL_GET_SUBNET6_ANY(WHERE s.subnet_id = $1)
+    },
+
+    // Select unassigned subnet by id.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_SUBNET6_ID_UNASSIGNED,
+        1,
+        {
+            OID_INT8    // 1 subnet_id
+        },
+        "GET_SUBNET6_ID_UNASSIGNED",
+        PGSQL_GET_SUBNET6_UNASSIGNED(AND s.subnet_id = $1)
+    },
+
+    // Select subnet by prefix.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_SUBNET6_PREFIX_NO_TAG,
+        1,
+        {
+            OID_VARCHAR // 1 subnet_prefix
+        },
+        "GET_SUBNET6_PREFIX_NO_TAG",
+        PGSQL_GET_SUBNET6_NO_TAG(WHERE s.subnet_prefix = $1)
+    },
+
+    // Select subnet by prefix without specifying server tags.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_SUBNET6_PREFIX_ANY,
+        1,
+        {
+            OID_VARCHAR // 1 subnet_prefix
+        },
+        "GET_SUBNET6_PREFIX_ANY",
+        PGSQL_GET_SUBNET6_ANY(WHERE s.subnet_prefix = $1)
+    },
+
+    // Select unassigned subnet by prefix.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_SUBNET6_PREFIX_UNASSIGNED,
+        1,
+        {
+            OID_VARCHAR // 1 subnet_prefix
+        },
+        "GET_SUBNET6_PREFIX_UNASSIGNED",
+        PGSQL_GET_SUBNET6_UNASSIGNED(AND s.subnet_prefix = $1)
+    },
+
+    // Select all subnets.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_ALL_SUBNETS6,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_SUBNETS6",
+        PGSQL_GET_SUBNET6_NO_TAG()
+    },
+
+    // Select all unassigned subnets.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_ALL_SUBNETS6_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_SUBNETS6_UNASSIGNED",
+        PGSQL_GET_SUBNET6_UNASSIGNED()
+    },
+
+    // Select subnets having modification time later than X.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_SUBNETS6,
+        1,
+        {
+            OID_TIMESTAMP // 1 modification_ts
+        },
+        "GET_MODIFIED_SUBNETS6",
+        PGSQL_GET_SUBNET6_NO_TAG(WHERE s.modification_ts >= $1)
+    },
+
+    // Select modified and unassigned subnets.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_SUBNETS6_UNASSIGNED,
+        1,
+        {
+            OID_TIMESTAMP // 1 modification_ts
+        },
+        "GET_MODIFIED_SUBNETS6_UNASSIGNED",
+        PGSQL_GET_SUBNET6_UNASSIGNED(AND s.modification_ts >= $1)
+    },
+
+    // Select subnets belonging to a shared network.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_SHARED_NETWORK_SUBNETS6,
+        1,
+        {
+            OID_VARCHAR // 1 share_network_name
+        },
+        "GET_SHARED_NETWORK_SUBNETS6",
+        PGSQL_GET_SUBNET6_ANY(WHERE s.shared_network_name = $1)
+    },
+
+    // Select pool by address range for a server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_POOL6_RANGE,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_TEXT,       // 2 start_address - cast as inet
+            OID_TEXT        // 3 end_address - cast as inet
+        },
+        "GET_POOL6_RANGE",
+        PGSQL_GET_POOL6_RANGE_WITH_TAG(WHERE (srv.tag = $1 OR srv.id = 1) \
+                                       AND (p.start_address = cast($2 as inet)) \
+                                       AND (p.end_address = cast($3 as inet)))
+    },
+
+    // Select pool by address range for any server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_POOL6_RANGE_ANY,
+        2,
+        {
+            OID_TEXT,       // 1 start_address - cast as inet
+            OID_TEXT        // 2 end_address - cast as inet
+        },
+        "GET_POOL6_RANGE_ANY",
+        PGSQL_GET_POOL6_RANGE_NO_TAG(WHERE (p.start_address = cast($1 as inet)) AND \
+                                           (p.end_address = cast($2 as inet)))
+    },
+
+    // Select prefix delegation pool for a server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_PD_POOL,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR,    // 2 pd pool prefix
+            OID_INT2        // 3 prefix length
+        },
+        "GET_PD_POOL",
+        PGSQL_GET_PD_POOL_WITH_TAG(WHERE (srv.tag = $1 OR srv.id = 1) AND p.prefix = $2 AND p.prefix_length = $3)
+    },
+
+    // Select prefix delegation pool for any server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_PD_POOL_ANY,
+        2,
+        {
+            OID_VARCHAR,    // 1 prefix
+            OID_INT2        // 2 prefix length
+        },
+        "GET_PD_POOL_ANY",
+        PGSQL_GET_PD_POOL_NO_TAG(WHERE p.prefix = $1 AND p.prefix_length = $2)
+    },
+
+    // Select shared network by name.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_SHARED_NETWORK6_NAME_NO_TAG,
+        1,
+        {
+            OID_VARCHAR // name of network
+        },
+        "GET_SHARED_NETWORK6_NAME_NO_TAG",
+        PGSQL_GET_SHARED_NETWORK6_NO_TAG(WHERE n.name = $1)
+    },
+
+    // Select shared network by name without specifying server tags.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_SHARED_NETWORK6_NAME_ANY,
+        1,
+        {
+            OID_VARCHAR // name of network
+        },
+        "GET_SHARED_NETWORK6_NAME_ANY",
+        PGSQL_GET_SHARED_NETWORK6_ANY(WHERE n.name = $1)
+    },
+
+    // Select unassigned shared network by name.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_SHARED_NETWORK6_NAME_UNASSIGNED,
+        1,
+        {
+            OID_VARCHAR // name of network
+        },
+        "GET_SHARED_NETWORK6_NAME_UNASSIGNED",
+        PGSQL_GET_SHARED_NETWORK6_UNASSIGNED(AND n.name = $1)
+    },
+
+    // Select all shared networks.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_ALL_SHARED_NETWORKS6,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_SHARED_NETWORKS6",
+        PGSQL_GET_SHARED_NETWORK6_NO_TAG()
+    },
+
+    // Select all unassigned shared networks.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_ALL_SHARED_NETWORKS6_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_SHARED_NETWORKS6_UNASSIGNED",
+        PGSQL_GET_SHARED_NETWORK6_UNASSIGNED()
+    },
+
+    // Select modified shared networks.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_SHARED_NETWORKS6,
+        1,
+        {
+            OID_TIMESTAMP  // 1 modification_ts
+        },
+        "GET_MODIFIED_SHARED_NETWORKS6",
+        PGSQL_GET_SHARED_NETWORK6_NO_TAG(WHERE n.modification_ts >= $1)
+    },
+
+    // Select modified and unassigned shared networks.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_SHARED_NETWORKS6_UNASSIGNED,
+        1,
+        {
+            OID_TIMESTAMP  // 1 modification_ts
+        },
+        "GET_MODIFIED_SHARED_NETWORKS6_UNASSIGNED",
+        PGSQL_GET_SHARED_NETWORK6_UNASSIGNED(AND n.modification_ts >= $1)
+    },
+
+    // Retrieves option definition by code and space.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_OPTION_DEF6_CODE_SPACE,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT2,       // 2 code
+            OID_VARCHAR     // 3 space
+        },
+        "GET_OPTION_DEF6_CODE_SPACE",
+        PGSQL_GET_OPTION_DEF(dhcp6, AND d.code = $2 AND d.space = $3)
+    },
+
+    // Retrieves all option definitions.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_ALL_OPTION_DEFS6,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "GET_ALL_OPTION_DEFS6",
+        PGSQL_GET_OPTION_DEF(dhcp6)
+    },
+
+    // Retrieves modified option definitions.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_OPTION_DEFS6,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_TIMESTAMP   // 2 modification_ts
+        },
+        "GET_MODIFIED_OPTION_DEFS6",
+        PGSQL_GET_OPTION_DEF(dhcp6, AND d.modification_ts >= $2)
+    },
+
+    // Retrieves global option by code and space.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_OPTION6_CODE_SPACE,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT2,       // 2 code
+            OID_VARCHAR     // 3 space
+        },
+        "GET_OPTION6_CODE_SPACE",
+        PGSQL_GET_OPTION6(AND o.scope_id = 0 AND o.code = $2 AND o.space = $3)
+    },
+
+    // Retrieves all global options.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_ALL_OPTIONS6,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "GET_ALL_OPTIONS6",
+        PGSQL_GET_OPTION6(AND o.scope_id = 0)
+    },
+
+    // Retrieves modified options.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_OPTIONS6,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_TIMESTAMP   // 2 modification_ts
+        },
+        "GET_MODIFIED_OPTIONS6",
+        PGSQL_GET_OPTION6(AND o.scope_id = 0 AND o.modification_ts >= $2)
+    },
+
+    // Retrieves an option for a given subnet, option code and space.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_OPTION6_SUBNET_ID_CODE_SPACE,
+        4,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT8,       // 2 subnet_id
+            OID_INT2,       // 3 code
+            OID_VARCHAR     // 4 space
+        },
+        "GET_OPTION6_SUBNET_ID_CODE_SPACE",
+        PGSQL_GET_OPTION6(AND o.scope_id = 1 AND o.dhcp6_subnet_id = $2 AND o.code = $3 AND o.space = $4)
+    },
+
+    // Retrieves an option for a given pool, option code and space.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_OPTION6_POOL_ID_CODE_SPACE,
+        4,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT8,       // 2 pool_id
+            OID_INT2,       // 3 code
+            OID_VARCHAR     // 4 space
+        },
+        "GET_OPTION6_POOL_ID_CODE_SPACE",
+        PGSQL_GET_OPTION6(AND o.scope_id = 5 AND o.pool_id = $2 AND o.code = $3 AND o.space = $4)
+    },
+
+    // Retrieves an option for a given pd pool, option code and space.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_OPTION6_PD_POOL_ID_CODE_SPACE,
+        4,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT8,       // 2 pd_pool_id
+            OID_INT2,       // 3 code
+            OID_VARCHAR     // 4 space
+        },
+        "GET_OPTION6_PD_POOL_ID_CODE_SPACE",
+        PGSQL_GET_OPTION6(AND o.scope_id = 6 AND o.pd_pool_id = $2 AND o.code = $3 AND o.space = $4)
+    },
+
+    // Retrieves an option for a given shared network, option code and space.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_OPTION6_SHARED_NETWORK_CODE_SPACE,
+        4,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR,    // 2 shared_network_name
+            OID_INT2,       // 3 code
+            OID_VARCHAR     // 4 space
+        },
+        "GET_OPTION6_SHARED_NETWORK_CODE_SPACE",
+        PGSQL_GET_OPTION6(AND o.scope_id = 4 AND o.shared_network_name = $2 AND o.code = $3 AND o.space = $4)
+    },
+
+    // Select a client class by name.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_CLIENT_CLASS6_NAME,
+        1,
+        {
+            OID_VARCHAR // name of class
+        },
+        "GET_CLIENT_CLASS6_NAME",
+        PGSQL_GET_CLIENT_CLASS6_WITH_TAG(WHERE c.name = $1)
+    },
+
+    // Select all client classes.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_ALL_CLIENT_CLASSES6,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_CLIENT_CLASSES6",
+        PGSQL_GET_CLIENT_CLASS6_WITH_TAG()
+    },
+
+    // Select all unassigned client classes.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_ALL_CLIENT_CLASSES6_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_CLIENT_CLASSES6_UNASSIGNED",
+        PGSQL_GET_CLIENT_CLASS6_UNASSIGNED()
+    },
+
+    // Select modified client classes.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_CLIENT_CLASSES6,
+        1,
+        {
+            OID_TIMESTAMP // 1 modification_ts
+        },
+        "GET_MODIFIED_CLIENT_CLASSES6",
+        PGSQL_GET_CLIENT_CLASS6_WITH_TAG(WHERE c.modification_ts >= $1)
+    },
+
+    // Select modified client classes.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_CLIENT_CLASSES6_UNASSIGNED,
+        1,
+        {
+            OID_TIMESTAMP // 1 modification_ts
+        },
+        "GET_MODIFIED_CLIENT_CLASSES6_UNASSIGNED",
+        PGSQL_GET_CLIENT_CLASS6_UNASSIGNED(AND c.modification_ts >= $1)
+    },
+
+    // Retrieves the most recent audit entries.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_AUDIT_ENTRIES6_TIME,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_INT8        // 3 revision id
+        },
+        "GET_AUDIT_ENTRIES6_TIME",
+        PGSQL_GET_AUDIT_ENTRIES_TIME(dhcp6)
+    },
+
+    // Retrieves a server by tag.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_SERVER6,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "GET_SERVER6",
+        PGSQL_GET_SERVER(dhcp6)
+    },
+
+    // Retrieves all servers.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_ALL_SERVERS6,
+        0,
+        {
+            OID_NONE
+        },
+        "GET_ALL_SERVERS6",
+        PGSQL_GET_ALL_SERVERS(dhcp6)
+    },
+
+    // Insert global parameter.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_GLOBAL_PARAMETER6,
+        4,
+        {
+            OID_VARCHAR,    // 1 name
+            OID_TEXT,       // 2 value
+            OID_INT2,       // 3 parameter_type
+            OID_TIMESTAMP   // 4 modification_ts
+        },
+        "INSERT_GLOBAL_PARAMETER6",
+        PGSQL_INSERT_GLOBAL_PARAMETER(dhcp6)
+    },
+
+    // Insert association of the global parameter with a server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_GLOBAL_PARAMETER6_SERVER,
+        3,
+        {
+            OID_INT8,       // 1 parameter_id
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_GLOBAL_PARAMETER6_SERVER",
+        PGSQL_INSERT_GLOBAL_PARAMETER_SERVER(dhcp6)
+    },
+
+    // Insert a subnet.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_SUBNET6,
+        35,
+        {
+            OID_INT8,       //  1 subnet_id,
+            OID_VARCHAR,    //  2 subnet_prefix
+            OID_VARCHAR,    //  3 client_class
+            OID_VARCHAR,    //  4 interface
+            OID_TIMESTAMP,  //  5 modification_ts
+            OID_INT8,       //  6 preferred_lifetime
+            OID_INT8,       //  7 min_preferred_lifetime
+            OID_INT8,       //  8 max_preferred_lifetime
+            OID_BOOL,       //  9 rapid_commit
+            OID_INT8,       // 10 rebind_timer
+            OID_TEXT,       // 11 relay
+            OID_INT8,       // 12 renew_timer
+            OID_TEXT,       // 13 require_client_classes
+            OID_BOOL,       // 14 reservations_global
+            OID_VARCHAR,    // 15 shared_network_name
+            OID_TEXT,       // 16 user_context - cast as json
+            OID_INT8,       // 17 valid_lifetime
+            OID_INT8,       // 18 min_valid_lifetime
+            OID_INT8,       // 19 max_valid_lifetime
+            OID_BOOL,       // 20 calculate_tee_times
+            OID_TEXT,       // 21 t1_percent - cast as float
+            OID_TEXT,       // 22 t2_percent - cast as float
+            OID_BYTEA,      // 23 interface_id
+            OID_BOOL,       // 24 ddns_send_updates
+            OID_BOOL,       // 25 ddns_override_no_update
+            OID_BOOL,       // 26 ddns_override_client_update
+            OID_INT8,       // 27 ddns_replace_client_name
+            OID_VARCHAR,    // 28 ddns_generated_prefix
+            OID_VARCHAR,    // 29 ddns_qualifying_suffix
+            OID_BOOL,       // 30 reservations_in_subnet
+            OID_BOOL,       // 31 reservations_out_of_pool
+            OID_TEXT,       // 32 cache_threshold - cast as float
+            OID_INT8,       // 33 cache_max_age
+            OID_VARCHAR,    // 34 allocator
+            OID_VARCHAR     // 35 pd_allocator
+        },
+        "INSERT_SUBNET6",
+        "INSERT INTO dhcp6_subnet("
+        "  subnet_id,"
+        "  subnet_prefix,"
+        "  client_class,"
+        "  interface,"
+        "  modification_ts,"
+        "  preferred_lifetime,"
+        "  min_preferred_lifetime,"
+        "  max_preferred_lifetime,"
+        "  rapid_commit,"
+        "  rebind_timer,"
+        "  relay,"
+        "  renew_timer,"
+        "  require_client_classes,"
+        "  reservations_global,"
+        "  shared_network_name,"
+        "  user_context,"
+        "  valid_lifetime,"
+        "  min_valid_lifetime,"
+        "  max_valid_lifetime,"
+        "  calculate_tee_times,"
+        "  t1_percent,"
+        "  t2_percent,"
+        "  interface_id,"
+        "  ddns_send_updates,"
+        "  ddns_override_no_update,"
+        "  ddns_override_client_update,"
+        "  ddns_replace_client_name,"
+        "  ddns_generated_prefix,"
+        "  ddns_qualifying_suffix,"
+        "  reservations_in_subnet,"
+        "  reservations_out_of_pool,"
+        "  cache_threshold,"
+        "  cache_max_age,"
+        "  allocator,"
+        "  pd_allocator"
+        ") VALUES ("
+        "   $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, "
+        "   $11, $12, $13, $14, $15, cast($16 as json), $17, $18, $19, $20, "
+        "   cast($21 as float), cast($22 as float), $23, $24, $25, $26, $27, $28, $29, $30, "
+        "   $31, cast($32 as float), $33, $34, $35"
+        ")"
+    },
+
+    // Insert association of the subnet with a server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_SUBNET6_SERVER,
+        3,
+        {
+            OID_INT8,       // 1 subnet_id
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_SUBNET6_SERVER",
+        PGSQL_INSERT_SUBNET_SERVER(dhcp6)
+    },
+
+    // Insert pool for a subnet.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_POOL6,
+        7,
+        {
+            OID_TEXT,       // 1 start_address - cast as inet
+            OID_TEXT,       // 2 end_address - cast as inet
+            OID_INT8,       // 3 subnet_id
+            OID_VARCHAR,    // 4 client_class
+            OID_TEXT,       // 5 require_client_classes
+            OID_TEXT,       // 6 user_context - cast as json
+            OID_TIMESTAMP   // 7 modification_ts
+        },
+        "INSERT_POOL6",
+        PGSQL_INSERT_POOL(dhcp6)
+    },
+
+    // Insert pd pool for a subnet.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_PD_POOL,
+        10,
+        {
+            OID_VARCHAR,    //  1 prefix
+            OID_INT2,       //  2 prefix_length
+            OID_INT2,       //  3 delegated_prefix_length
+            OID_INT8,       //  4 subnet_id
+            OID_VARCHAR,    //  5 excluded_prefix
+            OID_INT2,       //  6 excluded_prefix_length
+            OID_VARCHAR,    //  7 client_class
+            OID_TEXT,       //  8 require_client_classes
+            OID_TEXT,       //  9 user_context - cast as json
+            OID_TIMESTAMP,  // 10 modification_ts
+        },
+        "INSERT_PD_POOL",
+        PGSQL_INSERT_PD_POOL()
+    },
+
+    // Insert a shared network.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_SHARED_NETWORK6,
+        33,
+        {
+            OID_VARCHAR,    //  1 name
+            OID_VARCHAR,    //  2 client_class
+            OID_VARCHAR,    //  3 interface
+            OID_TIMESTAMP,  //  4 modification_ts
+            OID_INT8,       //  5 preferred_lifetime
+            OID_INT8,       //  6 min_preferred_lifetime
+            OID_INT8,       //  7 max_preferred_lifetime
+            OID_BOOL,       //  8 rapid_commit
+            OID_INT8,       //  9 rebind_timer
+            OID_TEXT,       // 10 relay
+            OID_INT8,       // 11 renew_timer
+            OID_TEXT,       // 12 require_client_classes
+            OID_BOOL,       // 13 reservations_global
+            OID_TEXT,       // 14 user_context - cast as json
+            OID_INT8,       // 15 valid_lifetime
+            OID_INT8,       // 16 min_valid_lifetime
+            OID_INT8,       // 17 max_valid_lifetime
+            OID_BOOL,       // 18 calculate_tee_times
+            OID_TEXT,       // 19 t1_percent - cast as float
+            OID_TEXT,       // 20 t2_percent - cast as float
+            OID_BYTEA,      // 21 interface-id
+            OID_BOOL,       // 22 ddns_send_updates
+            OID_BOOL,       // 23 ddns_override_no_update
+            OID_BOOL,       // 24 ddns_override_client_update
+            OID_INT8,       // 25 ddns_replace_client_name
+            OID_VARCHAR,    // 26 ddns_generated_prefix
+            OID_VARCHAR,    // 27 ddns_qualifying_suffix
+            OID_BOOL,       // 28 reservations_in_subnet
+            OID_BOOL,       // 29 reservations_out_of_pool
+            OID_TEXT,       // 30 cache_threshold - cast as float
+            OID_INT8,       // 31 cache_max_age
+            OID_VARCHAR,    // 32 allocator
+            OID_VARCHAR     // 33 pd_allocator
+        },
+        "INSERT_SHARED_NETWORK6",
+        "INSERT INTO dhcp6_shared_network("
+        "  name,"
+        "  client_class,"
+        "  interface,"
+        "  modification_ts,"
+        "  preferred_lifetime,"
+        "  min_preferred_lifetime,"
+        "  max_preferred_lifetime,"
+        "  rapid_commit,"
+        "  rebind_timer,"
+        "  relay,"
+        "  renew_timer,"
+        "  require_client_classes,"
+        "  reservations_global,"
+        "  user_context,"
+        "  valid_lifetime,"
+        "  min_valid_lifetime,"
+        "  max_valid_lifetime,"
+        "  calculate_tee_times,"
+        "  t1_percent,"
+        "  t2_percent,"
+        "  interface_id,"
+        "  ddns_send_updates,"
+        "  ddns_override_no_update,"
+        "  ddns_override_client_update,"
+        "  ddns_replace_client_name,"
+        "  ddns_generated_prefix,"
+        "  ddns_qualifying_suffix,"
+        "  reservations_in_subnet,"
+        "  reservations_out_of_pool,"
+        "  cache_threshold,"
+        "  cache_max_age,"
+        "  allocator,"
+        "  pd_allocator"
+        ") VALUES ("
+        "   $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, "
+        "   $11, $12, $13, cast($14 as json), $15, $16, $17, $18,"
+        "   cast($19 as float), cast($20 as float), $21, $22, $23,"
+        "   $24, $25, $26, $27, $28, $29, cast($30 as float), $31, $32, $33"
+        ")"
+    },
+
+    // Insert association of the shared network with a server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_SHARED_NETWORK6_SERVER,
+        3,
+        {
+            OID_VARCHAR,    // 1 shared_network_name
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_SHARED_NETWORK6_SERVER",
+        PGSQL_INSERT_SHARED_NETWORK_SERVER(dhcp6)
+    },
+
+    // Insert option definition.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6,
+        10,
+        {
+            OID_INT2,       //  1 code
+            OID_VARCHAR,    //  2 name
+            OID_VARCHAR,    //  3 space
+            OID_INT2,       //  4 type
+            OID_TIMESTAMP,  //  5 modification_ts
+            OID_BOOL,       //  6 is_array
+            OID_VARCHAR,    //  7 encapsulate
+            OID_VARCHAR,    //  8 record_types
+            OID_VARCHAR,    //  9 user_context
+            OID_INT8        // 10 class_id
+        },
+        "INSERT_OPTION_DEF6",
+        PGSQL_INSERT_OPTION_DEF(dhcp6)
+    },
+
+    // Insert option definition for client class.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6_CLIENT_CLASS,
+        10,
+        {
+            OID_INT2,       //  1 code
+            OID_VARCHAR,    //  2 name
+            OID_VARCHAR,    //  3 space
+            OID_INT2,       //  4 type
+            OID_TIMESTAMP,  //  5 modification_ts
+            OID_BOOL,       //  6 is_array
+            OID_VARCHAR,    //  7 encapsulate
+            OID_VARCHAR,    //  8 record_types
+            OID_VARCHAR,    //  9 user_context
+            OID_VARCHAR     // 10 class name for where clause
+        },
+        "INSERT_OPTION_DEF6_CLIENT_CLASS",
+        PGSQL_INSERT_OPTION_DEF_CLIENT_CLASS(dhcp6)
+    },
+
+    // Insert association of the option definition with a server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_OPTION_DEF6_SERVER,
+        3,
+        {
+            OID_INT8,       // 1 option_def_id
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_OPTION_DEF6_SERVER",
+        PGSQL_INSERT_OPTION_DEF_SERVER(dhcp6)
+    },
+
+    // Insert subnet specific option.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_OPTION6,
+        14,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp6_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_INT8        // 14 pd_pool_id
+        },
+        "INSERT_OPTION6",
+        PGSQL_INSERT_OPTION6()
+    },
+
+    // Insert association of the DHCP option with a server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_OPTION6_SERVER,
+        3,
+        {
+            OID_INT8,       // 1 option_id
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_OPTION6_SERVER",
+        PGSQL_INSERT_OPTION_SERVER(dhcp6)
+    },
+
+    // Insert client class.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6,
+        13,
+        {
+            OID_VARCHAR,    //  1 name
+            OID_TEXT,       //  2 test
+            OID_BOOL,       //  3 only_if_required
+            OID_INT8,       //  4 valid_lifetime
+            OID_INT8,       //  5 min_valid_lifetime
+            OID_INT8,       //  6 max_valid_lifetime
+            OID_BOOL,       //  7 depend_on_known_directly
+            OID_VARCHAR,    //  8 follow_class_name
+            OID_INT8,       //  9 preferred_lifetime
+            OID_INT8,       // 10 min_preferred_lifetime
+            OID_INT8,       // 11 max_preferred_lifetime
+            OID_TIMESTAMP,  // 12 modification_ts
+            OID_TEXT        // 13 user_context cast as JSON
+        },
+        "INSERT_CLIENT_CLASS6",
+        "INSERT INTO dhcp6_client_class("
+        "  name,"
+        "  test,"
+        "  only_if_required,"
+        "  valid_lifetime,"
+        "  min_valid_lifetime,"
+        "  max_valid_lifetime,"
+        "  depend_on_known_directly,"
+        "  follow_class_name,"
+        "  preferred_lifetime,"
+        "  min_preferred_lifetime,"
+        "  max_preferred_lifetime,"
+        "  modification_ts,"
+        "  user_context "
+        ") VALUES ("
+        "   $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, cast($13 as JSON)"
+        ")"
+    },
+
+    // Insert association of a client class with a server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6_SERVER,
+        3,
+        {
+            OID_VARCHAR,    // 1 class_name
+            OID_TIMESTAMP,  // 2 modification_ts
+            OID_VARCHAR     // 3 server_tag
+        },
+        "INSERT_CLIENT_CLASS6_SERVER",
+        PGSQL_INSERT_CLIENT_CLASS_SERVER(dhcp6)
+    },
+
+    // Insert client class dependency.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_CLIENT_CLASS6_DEPENDENCY,
+        2,
+        {
+            OID_VARCHAR,    // class name
+            OID_VARCHAR     // dependency class name
+        },
+        "INSERT_CLIENT_CLASS6_DEPENDENCY",
+        PGSQL_INSERT_CLIENT_CLASS_DEPENDENCY(dhcp6)
+    },
+
+    // Insert server with server tag and description.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::INSERT_SERVER6,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR,    // 2 description
+            OID_TIMESTAMP   // 3 modification_ts
+        },
+        "INSERT_SERVER6",
+        PGSQL_INSERT_SERVER(dhcp6)
+    },
+
+    // Update existing global parameter.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_GLOBAL_PARAMETER6,
+        6,
+        {
+            OID_VARCHAR,    // 1 name
+            OID_TEXT,       // 2 value
+            OID_INT2,       // 3 parameter_type
+            OID_TIMESTAMP,  // 4 modification_ts
+            OID_VARCHAR,    // 5 server_tag
+            OID_VARCHAR,    // 6 name (of global to update)
+        },
+        "UPDATE_GLOBAL_PARAMETER6",
+        PGSQL_UPDATE_GLOBAL_PARAMETER(dhcp6)
+    },
+
+    // Update existing subnet.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_SUBNET6,
+        37,
+        {
+            OID_INT8,       //  1 subnet_id,
+            OID_VARCHAR,    //  2 subnet_prefix
+            OID_VARCHAR,    //  3 client_class
+            OID_VARCHAR,    //  4 interface
+            OID_TIMESTAMP,  //  5 modification_ts
+            OID_INT8,       //  6 preferred_lifetime
+            OID_INT8,       //  7 min_preferred_lifetime
+            OID_INT8,       //  8 max_preferred_lifetime
+            OID_BOOL,       //  9 rapid_commit
+            OID_INT8,       // 10 rebind_timer
+            OID_TEXT,       // 11 relay
+            OID_INT8,       // 12 renew_timer
+            OID_TEXT,       // 13 require_client_classes
+            OID_BOOL,       // 14 reservations_global
+            OID_VARCHAR,    // 15 shared_network_name
+            OID_TEXT,       // 16 user_context - cast as json
+            OID_INT8,       // 17 valid_lifetime
+            OID_INT8,       // 18 min_valid_lifetime
+            OID_INT8,       // 19 max_valid_lifetime
+            OID_BOOL,       // 20 calculate_tee_times
+            OID_TEXT,       // 21 t1_percent - cast as float
+            OID_TEXT,       // 22 t2_percent - cast as float
+            OID_BYTEA,      // 23 interface_id
+            OID_BOOL,       // 24 ddns_send_updates
+            OID_BOOL,       // 25 ddns_override_no_update
+            OID_BOOL,       // 26 ddns_override_client_update
+            OID_INT8,       // 27 ddns_replace_client_name
+            OID_VARCHAR,    // 28 ddns_generated_prefix
+            OID_VARCHAR,    // 29 ddns_qualifying_suffix
+            OID_BOOL,       // 30 reservations_in_subnet
+            OID_BOOL,       // 31 reservations_out_of_pool
+            OID_TEXT,       // 32 cache_threshold - cast as float
+            OID_INT8,       // 33 cache_max_age
+            OID_VARCHAR,    // 34 allocator
+            OID_VARCHAR     // 35 pd_allocator
+        },
+        "UPDATE_SUBNET6",
+        "UPDATE dhcp6_subnet SET"
+        "  subnet_id = $1,"
+        "  subnet_prefix = $2,"
+        "  client_class = $3,"
+        "  interface = $4,"
+        "  modification_ts = $5,"
+        "  preferred_lifetime = $6,"
+        "  min_preferred_lifetime = $7,"
+        "  max_preferred_lifetime = $8,"
+        "  rapid_commit = $9,"
+        "  rebind_timer = $10,"
+        "  relay = $11,"
+        "  renew_timer = $12,"
+        "  require_client_classes = $13,"
+        "  reservations_global = $14,"
+        "  shared_network_name = $15,"
+        "  user_context = cast($16 as json),"
+        "  valid_lifetime = $17,"
+        "  min_valid_lifetime = $18,"
+        "  max_valid_lifetime = $19,"
+        "  calculate_tee_times = $20,"
+        "  t1_percent = cast($21 as float),"
+        "  t2_percent = cast($22 as float),"
+        "  interface_id = $23,"
+        "  ddns_send_updates = $24,"
+        "  ddns_override_no_update = $25,"
+        "  ddns_override_client_update = $26,"
+        "  ddns_replace_client_name = $27,"
+        "  ddns_generated_prefix = $28,"
+        "  ddns_qualifying_suffix = $29,"
+        "  reservations_in_subnet = $30,"
+        "  reservations_out_of_pool = $31,"
+        "  cache_threshold = cast($32 as float),"
+        "  cache_max_age =  $33,"
+        "  allocator = $34,"
+        "  pd_allocator = $35 "
+        "WHERE subnet_id = $36 OR subnet_prefix = $37"
+    },
+
+    // Update existing shared network.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_SHARED_NETWORK6,
+        34,
+        {
+            OID_VARCHAR,    //  1 name
+            OID_VARCHAR,    //  2 client_class
+            OID_VARCHAR,    //  3 interface
+            OID_TIMESTAMP,  //  4 modification_ts
+            OID_INT8,       //  5 preferred_lifetime
+            OID_INT8,       //  6 min_preferred_lifetime
+            OID_INT8,       //  7 max_preferred_lifetime
+            OID_BOOL,       //  8 rapid_commit
+            OID_INT8,       //  9 rebind_timer
+            OID_TEXT,       // 10 relay
+            OID_INT8,       // 11 renew_timer
+            OID_TEXT,       // 12 require_client_classes
+            OID_BOOL,       // 13 reservations_global
+            OID_TEXT,       // 14 user_context - cast as json
+            OID_INT8,       // 15 valid_lifetime
+            OID_INT8,       // 16 min_valid_lifetime
+            OID_INT8,       // 17 max_valid_lifetime
+            OID_BOOL,       // 18 calculate_tee_times
+            OID_TEXT,       // 19 t1_percent - cast as float
+            OID_TEXT,       // 20 t2_percent - cast as float
+            OID_BYTEA,      // 21 interface-id
+            OID_BOOL,       // 22 ddns_send_updates
+            OID_BOOL,       // 23 ddns_override_no_update
+            OID_BOOL,       // 24 ddns_override_client_update
+            OID_INT8,       // 25 ddns_replace_client_name
+            OID_VARCHAR,    // 26 ddns_generated_prefix
+            OID_VARCHAR,    // 27 ddns_qualifying_suffix
+            OID_BOOL,       // 28 reservations_in_subnet
+            OID_BOOL,       // 29 reservations_out_of_pool
+            OID_TEXT,       // 30 cache_threshold - cast as float
+            OID_INT8,       // 31 cache_max_age
+            OID_VARCHAR,    // 32 allocator
+            OID_VARCHAR     // 33 pd_allocator
+        },
+        "UPDATE_SHARED_NETWORK6",
+        "UPDATE dhcp6_shared_network SET"
+        "  name = $1,"
+        "  client_class = $2,"
+        "  interface = $3,"
+        "  modification_ts = $4,"
+        "  preferred_lifetime = $5,"
+        "  min_preferred_lifetime = $6,"
+        "  max_preferred_lifetime = $7,"
+        "  rapid_commit = $8,"
+        "  rebind_timer = $9,"
+        "  relay = $10,"
+        "  renew_timer = $11,"
+        "  require_client_classes = $12,"
+        "  reservations_global = $13,"
+        "  user_context = cast($14 as json),"
+        "  valid_lifetime = $15,"
+        "  min_valid_lifetime = $16,"
+        "  max_valid_lifetime = $17,"
+        "  calculate_tee_times = $18,"
+        "  t1_percent = cast($19 as float),"
+        "  t2_percent = cast($20 as float),"
+        "  interface_id = $21,"
+        "  ddns_send_updates = $22,"
+        "  ddns_override_no_update = $23,"
+        "  ddns_override_client_update = $24,"
+        "  ddns_replace_client_name = $25,"
+        "  ddns_generated_prefix = $26,"
+        "  ddns_qualifying_suffix = $27,"
+        "  reservations_in_subnet = $28,"
+        "  reservations_out_of_pool = $29,"
+        "  cache_threshold = cast($30 as float),"
+        "  cache_max_age = $31,"
+        "  allocator = $32,"
+        "  pd_allocator = $33 "
+        "WHERE name = $34"
+    },
+
+    // Update existing option definition.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION_DEF6,
+        13,
+        {
+            OID_INT2,       //  1 code
+            OID_VARCHAR,    //  2 name
+            OID_VARCHAR,    //  3 space
+            OID_INT2,       //  4 type
+            OID_TIMESTAMP,  //  5 modification_ts
+            OID_BOOL,       //  6 is_array
+            OID_VARCHAR,    //  7 encapsulate
+            OID_VARCHAR,    //  8 record_types
+            OID_TEXT,       //  9 user_context
+            OID_INT2,       // 10 class_id
+            OID_VARCHAR,    // 11 server_tag
+            OID_INT2,       // 12 code (of option to update)
+            OID_VARCHAR,    // 13 space (of option to update)
+        },
+        "UPDATE_OPTION_DEF6",
+        PGSQL_UPDATE_OPTION_DEF(dhcp6)
+    },
+
+    // Update existing client class option definition.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION_DEF6_CLIENT_CLASS,
+        13,
+        {
+            OID_INT2,       //  1 code
+            OID_VARCHAR,    //  2 name
+            OID_VARCHAR,    //  3 space
+            OID_INT2,       //  4 type
+            OID_TIMESTAMP,  //  5 modification_ts
+            OID_BOOL,       //  6 is_array
+            OID_VARCHAR,    //  7 encapsulate
+            OID_VARCHAR,    //  8 record_types
+            OID_TEXT,       //  9 user_context
+            OID_VARCHAR,    // 10 name (of class option belongs to)
+            OID_VARCHAR,    // 11 server_tag
+            OID_INT2,       // 12 code (of option to update)
+            OID_VARCHAR,    // 13 space (of option to update)
+        },
+        "UPDATE_OPTION_DEF6_CLIENT_CLASS",
+        PGSQL_UPDATE_OPTION_DEF_CLIENT_CLASS(dhcp6)
+    },
+
+    // Update existing global option.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6,
+        17,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp6_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_INT8,       // 14 pd_pool_id
+            OID_VARCHAR,    // 15 server_tag
+            OID_INT2,       // 16 code (of option to update)
+            OID_VARCHAR,    // 17 space (of option to update)
+        },
+        "UPDATE_OPTION6",
+        PGSQL_UPDATE_OPTION6_WITH_TAG(AND o.scope_id = 0 AND o.code = $16 AND o.space = $17)
+    },
+
+    // Update existing subnet level option.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_SUBNET_ID,
+        17,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp6_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_INT8,       // 14 pd_pool_id
+            OID_INT8,       // 15 subnet_id (of option to update)
+            OID_INT2,       // 16 code (of option to update)
+            OID_VARCHAR     // 17 space (of option to update)
+        },
+        "UPDATE_OPTION6_SUBNET_ID",
+        PGSQL_UPDATE_OPTION6_NO_TAG(o.scope_id = 1 AND o.dhcp6_subnet_id = $15 AND o.code = $16 AND o.space = $17)
+    },
+
+    // Update existing pool level option.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_POOL_ID,
+        17,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp6_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_INT8,       // 14 pd_pool_id
+            OID_INT8,       // 15 pool_id (of option to update)
+            OID_INT2,       // 16 code (of option to update)
+            OID_VARCHAR     // 17 space (of option to update)
+        },
+        "UPDATE_OPTION6_POOL_ID",
+        PGSQL_UPDATE_OPTION6_NO_TAG(o.scope_id = 5 AND o.pool_id = $15 AND o.code = $16 AND o.space = $17)
+    },
+
+    // Update existing pd pool level option.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_PD_POOL_ID,
+        17,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp6_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_INT8,       // 14 pd_pool_id
+            OID_INT8,       // 15 pd_pool_id (of option to update)
+            OID_INT2,       // 16 code (of option to update)
+            OID_VARCHAR     // 17 space (of option to update)
+        },
+        "UPDATE_OPTION6_PD_POOL_ID",
+        PGSQL_UPDATE_OPTION6_NO_TAG(o.scope_id = 6 AND o.pd_pool_id = $15 AND o.code = $16 AND o.space = $17)
+    },
+
+    // Update existing shared network level option.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_SHARED_NETWORK,
+        17,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp6_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_INT8,       // 14 pd_pool_id
+            OID_VARCHAR,    // 15 shared_network_name (of option to update)
+            OID_INT2,       // 16 code (of option to update)
+            OID_VARCHAR     // 17 space (of option to update)
+        },
+        "UPDATE_OPTION6_SHARED_NETWORK",
+        PGSQL_UPDATE_OPTION6_NO_TAG(o.scope_id = 4 AND o.shared_network_name = $15 AND o.code = $16 AND o.space = $17)
+    },
+
+    // Update existing client class level option.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_OPTION6_CLIENT_CLASS,
+        17,
+        {
+            OID_INT2,       //  1 code
+            OID_BYTEA,      //  2 value
+            OID_TEXT,       //  3 formatted_value
+            OID_VARCHAR,    //  4 space
+            OID_BOOL,       //  5 persistent
+            OID_BOOL,       //  6 cancelled
+            OID_VARCHAR,    //  7 dhcp_client_class
+            OID_INT8,       //  8 dhcp6_subnet_id
+            OID_INT2,       //  9 scope_id
+            OID_TEXT,       // 10 user_context
+            OID_VARCHAR,    // 11 shared_network_name
+            OID_INT8,       // 12 pool_id
+            OID_TIMESTAMP,  // 13 modification_ts
+            OID_INT8,       // 14 pd_pool_id
+            OID_VARCHAR,    // 15 client_class (of option to update)
+            OID_INT2,       // 16 code (of option to update)
+            OID_VARCHAR     // 17 space (of option to update)
+        },
+        "UPDATE_OPTION6_CLIENT_CLASS",
+        PGSQL_UPDATE_OPTION6_NO_TAG(o.scope_id = 2 AND o.dhcp_client_class = $15 AND o.code = $16 AND o.space = $17)
+    },
+
+    // Update existing client class with specifying its position.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_CLIENT_CLASS6,
+        14,
+        {
+            OID_VARCHAR,    //  1 name
+            OID_TEXT,       //  2 test
+            OID_BOOL,       //  3 only_if_required
+            OID_INT8,       //  4 valid_lifetime
+            OID_INT8,       //  5 min_valid_lifetime
+            OID_INT8,       //  6 max_valid_lifetime
+            OID_BOOL,       //  7 depend_on_known_directly
+            OID_VARCHAR,    //  8 follow_class_name
+            OID_INT8,       //  9 preferred_lifetime
+            OID_INT8,       // 10 min_preferred_lifetime
+            OID_INT8,       // 11 max_preferred_lifetime
+            OID_TIMESTAMP,  // 12 modification_ts
+            OID_TEXT,       // 13 user_context
+            OID_VARCHAR     // 14 name (of class to update)
+        },
+        "UPDATE_CLIENT_CLASS6",
+        PGSQL_UPDATE_CLIENT_CLASS6("follow_class_name = $8,")
+    },
+
+    // Update existing client class without specifying its position.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_CLIENT_CLASS6_SAME_POSITION,
+        14,
+        {
+            OID_VARCHAR,    //  1 name
+            OID_TEXT,       //  2 test
+            OID_BOOL,       //  3 only_if_required
+            OID_INT8,       //  4 valid_lifetime
+            OID_INT8,       //  5 min_valid_lifetime
+            OID_INT8,       //  6 max_valid_lifetime
+            OID_BOOL,       //  7 depend_on_known_directly
+            OID_VARCHAR,    //  8 follow_class_name
+            OID_INT8,       //  9 preferred_lifetime
+            OID_INT8,       // 10 min_preferred_lifetime
+            OID_INT8,       // 11 max_preferred_lifetime
+            OID_TIMESTAMP,  // 12 modification_ts
+            OID_TEXT,       // 13 user_context
+            OID_VARCHAR     // 14 name (of class to update)
+        },
+        "UPDATE_CLIENT_CLASS6_SAME_POSITION",
+        PGSQL_UPDATE_CLIENT_CLASS6("")
+    },
+
+    // Update existing server, e.g. server description.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::UPDATE_SERVER6,
+        4,
+        {
+            OID_VARCHAR,    // 1 tag
+            OID_VARCHAR,    // 2 description
+            OID_TIMESTAMP,  // 3 modification_ts
+            OID_VARCHAR     // 4 tag (of server to update)
+        },
+        "UPDATE_SERVER6",
+        PGSQL_UPDATE_SERVER(dhcp6)
+    },
+
+    // Delete global parameter by name.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_GLOBAL_PARAMETER6,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR     // 2 name of parameter
+        },
+        "DELETE_GLOBAL_PARAMETER6",
+        PGSQL_DELETE_GLOBAL_PARAMETER(dhcp6, AND g.name = $2)
+    },
+
+    // Delete all global parameters.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_GLOBAL_PARAMETERS6,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "DELETE_ALL_GLOBAL_PARAMETERS6",
+        PGSQL_DELETE_GLOBAL_PARAMETER(dhcp6)
+    },
+
+    // Delete all global parameters which are unassigned to any servers.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_GLOBAL_PARAMETERS6_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_GLOBAL_PARAMETERS6_UNASSIGNED",
+        PGSQL_DELETE_GLOBAL_PARAMETER_UNASSIGNED(dhcp6)
+    },
+
+    // Delete subnet by id with specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_ID_WITH_TAG,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT8        // 2 subnet_id
+        },
+        "DELETE_SUBNET6_ID_WITH_TAG",
+        PGSQL_DELETE_SUBNET_WITH_TAG(dhcp6, AND s.subnet_id = $2)
+    },
+
+    // Delete subnet by id without specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_ID_ANY,
+        1,
+        {
+            OID_INT8    // 1 subnet_id
+        },
+        "DELETE_SUBNET6_ID_ANY",
+        PGSQL_DELETE_SUBNET_ANY(dhcp6, WHERE s.subnet_id = $1)
+    },
+
+    // Delete subnet by prefix with specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_PREFIX_WITH_TAG,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR     // 2 subnet_prefix
+        },
+        "DELETE_SUBNET6_PREFIX_WITH_TAG",
+        PGSQL_DELETE_SUBNET_WITH_TAG(dhcp6, AND s.subnet_prefix = $2)
+    },
+
+    // Delete subnet by prefix without specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_PREFIX_ANY,
+        1,
+        {
+            OID_VARCHAR // 1 subnet_prefix
+        },
+        "DELETE_SUBNET6_PREFIX_ANY",
+        PGSQL_DELETE_SUBNET_ANY(dhcp6, WHERE s.subnet_prefix = $1)
+    },
+
+    // Delete all subnets.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "DELETE_ALL_SUBNETS6",
+        PGSQL_DELETE_SUBNET_WITH_TAG(dhcp6)
+    },
+
+    // Delete all unassigned subnets.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_SUBNETS6_UNASSIGNED",
+        PGSQL_DELETE_SUBNET_UNASSIGNED(dhcp6)
+    },
+
+    // Delete all subnets for a shared network.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6_SHARED_NETWORK_NAME,
+        1,
+        {
+            OID_VARCHAR // 1 shared_network_name
+        },
+        "DELETE_ALL_SUBNETS6_SHARED_NETWORK_NAME",
+        PGSQL_DELETE_SUBNET_ANY(dhcp6, WHERE s.shared_network_name = $1)
+    },
+
+    // Delete associations of a subnet with server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_SUBNET6_SERVER,
+        1,
+        {
+            OID_INT8    // 1 subnet_id
+        },
+        "DELETE_SUBNET6_SERVER",
+        PGSQL_DELETE_SUBNET_SERVER(dhcp6),
+    },
+
+    // Delete pools for a subnet.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_POOLS6,
+        2,
+        {
+            OID_INT8,   // 1 subnet_id
+            OID_VARCHAR // 2 subnet_prefix
+        },
+        "DELETE_POOLS6",
+        PGSQL_DELETE_POOLS(dhcp6)
+    },
+
+    // Delete pd pools for a subnet.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_PD_POOLS,
+        2,
+        {
+            OID_INT8,   // 1 subnet_id
+            OID_VARCHAR // 2 subnet_prefix
+        },
+        "DELETE_PD_POOLS",
+        PGSQL_DELETE_PD_POOLS()
+    },
+
+    // Delete shared network by name with specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_NAME_WITH_TAG,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR     // 2 shared_network_name
+        },
+        "DELETE_SHARED_NETWORK6_NAME_WITH_TAG",
+        PGSQL_DELETE_SHARED_NETWORK_WITH_TAG(dhcp6, AND n.name = $2)
+    },
+
+    // Delete shared network by name without specifying server tag.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_NAME_ANY,
+        1,
+        {
+            OID_VARCHAR // 1 shared_network_name
+        },
+        "DELETE_SHARED_NETWORK6_NAME_ANY",
+        PGSQL_DELETE_SHARED_NETWORK_ANY(dhcp6, WHERE n.name = $1)
+    },
+
+    // Delete all shared networks.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SHARED_NETWORKS6,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "DELETE_ALL_SHARED_NETWORKS6",
+        PGSQL_DELETE_SHARED_NETWORK_WITH_TAG(dhcp6)
+    },
+
+    // Delete all unassigned shared networks.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SHARED_NETWORKS6_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_SHARED_NETWORKS6_UNASSIGNED",
+        PGSQL_DELETE_SHARED_NETWORK_UNASSIGNED(dhcp6)
+    },
+
+    // Delete associations of a shared network with server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_SERVER,
+        1,
+        {
+            OID_VARCHAR // 1 shared_network_name
+        },
+        "DELETE_SHARED_NETWORK6_SERVER",
+        PGSQL_DELETE_SHARED_NETWORK_SERVER(dhcp6)
+    },
+
+    // Delete option definition.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION_DEF6_CODE_NAME,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT2,       // 2 code
+            OID_VARCHAR     // 3 space
+        },
+        "DELETE_OPTION_DEF6_CODE_NAME",
+        PGSQL_DELETE_OPTION_DEF(dhcp6, AND code = $2 AND space = $3)
+    },
+
+    // Delete all option definitions.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_OPTION_DEFS6,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "DELETE_ALL_OPTION_DEFS6",
+        PGSQL_DELETE_OPTION_DEF(dhcp6)
+    },
+
+    // Delete all option definitions which are assigned to no servers.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_OPTION_DEFS6_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_OPTION_DEFS6_UNASSIGNED",
+        PGSQL_DELETE_OPTION_DEF_UNASSIGNED(dhcp6)
+    },
+
+    // Delete client class specific option definitions.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION_DEFS6_CLIENT_CLASS,
+        1,
+        {
+            OID_VARCHAR // 1 class name
+        },
+        "DELETE_OPTION_DEFS6_CLIENT_CLASS",
+        PGSQL_DELETE_OPTION_DEFS_CLIENT_CLASS(dhcp6)
+    },
+
+    // Delete single global option.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION6,
+        3,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_INT2,       // 2 code
+            OID_VARCHAR     // 3 space
+        },
+        "DELETE_OPTION6",
+        PGSQL_DELETE_OPTION_WITH_TAG(dhcp6, AND o.scope_id = 0 AND o.code = $2 AND o.space = $3)
+    },
+
+    // Delete all global options which are unassigned to any servers.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_GLOBAL_OPTIONS6_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_GLOBAL_OPTIONS6_UNASSIGNED",
+        PGSQL_DELETE_OPTION_UNASSIGNED(dhcp6, AND o.scope_id = 0)
+    },
+
+    // Delete single option from a subnet.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION6_SUBNET_ID,
+        3,
+        {
+            OID_INT8,   // 1 subnet_id
+            OID_INT2,   // 2 code
+            OID_VARCHAR // 3 space
+        },
+        "DELETE_OPTION6_SUBNET_ID",
+        PGSQL_DELETE_OPTION_NO_TAG(dhcp6,
+            WHERE o.scope_id = 1 AND o.dhcp6_subnet_id = $1 AND o.code = $2 AND o.space = $3)
+    },
+
+    // Delete single option from a pool.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION6_POOL_RANGE,
+        4,
+        {
+            OID_TEXT,   // 1 start_address - cast as inet
+            OID_TEXT,   // 2 start_address - cast as inet
+            OID_INT2,   // 3 code
+            OID_VARCHAR // 4 space
+        },
+        "DELETE_OPTION6_POOL_RANGE",
+        PGSQL_DELETE_OPTION_POOL_RANGE(dhcp6, o.scope_id = 5 AND o.code = $3 AND o.space = $4)
+    },
+
+    // Delete single option from a pd pool.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION6_PD_POOL,
+        4,
+        {
+            OID_TEXT,   // 1 prefix
+            OID_INT2,   // 2 prefix_length
+            OID_INT2,   // 3 code
+            OID_VARCHAR // 4 space
+        },
+        "DELETE_OPTION6_PD_POOL",
+        PGSQL_DELETE_OPTION_PD_POOL(o.scope_id = 6 AND o.code = $3 AND o.space = $4)
+    },
+
+    // Delete single option from a shared network.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_OPTION6_SHARED_NETWORK,
+        3,
+        {
+            OID_VARCHAR,    // 1 shared_network_name
+            OID_INT2,       // 2 code
+            OID_VARCHAR     // 3 space
+        },
+        "DELETE_OPTION6_SHARED_NETWORK",
+        PGSQL_DELETE_OPTION_NO_TAG(dhcp6,
+            WHERE o.scope_id = 4 AND o.shared_network_name = $1 AND o.code = $2 AND o.space = $3)
+    },
+
+    // Delete options belonging to a subnet.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_OPTIONS6_SUBNET_ID_PREFIX,
+        2,
+        {
+            OID_INT8,   // 1 subnet_id
+            OID_VARCHAR // 2 subnet_prefix
+        },
+        "DELETE_OPTIONS6_SUBNET_ID_PREFIX",
+        PGSQL_DELETE_OPTION_SUBNET_ID_PREFIX(dhcp6)
+    },
+
+    // Delete options belonging to a shared_network.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_OPTIONS6_SHARED_NETWORK,
+        1,
+        {
+            OID_VARCHAR // shared_network_name
+        },
+        "DELETE_OPTIONS6_SHARED_NETWORK",
+        PGSQL_DELETE_OPTION_NO_TAG(dhcp6, WHERE o.scope_id = 4 AND o.shared_network_name = $1)
+    },
+
+    // Delete options belonging to a client class.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_OPTIONS6_CLIENT_CLASS,
+        1,
+        {
+            OID_VARCHAR // dhcp_client_class
+        },
+        "DELETE_OPTIONS6_CLIENT_CLASS",
+        PGSQL_DELETE_OPTION_NO_TAG(dhcp6, WHERE o.scope_id = 2 AND o.dhcp_client_class = $1)
+    },
+
+    // Delete all dependencies of a client class.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_DEPENDENCY,
+        1,
+        {
+            OID_VARCHAR, // 1 class name
+        },
+        "DELETE_CLIENT_CLASS6_DEPENDENCY",
+        PGSQL_DELETE_CLIENT_CLASS_DEPENDENCY(dhcp6)
+    },
+
+    // Delete associations of a client class with server.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_SERVER,
+        1,
+        {
+            OID_VARCHAR // 1 class name
+        },
+        "DELETE_CLIENT_CLASS6_SERVER",
+        PGSQL_DELETE_CLIENT_CLASS_SERVER(dhcp6),
+    },
+
+    // Delete all client classes.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_CLIENT_CLASSES6,
+        1,
+        {
+            OID_VARCHAR // 1 server_tag
+        },
+        "DELETE_ALL_CLIENT_CLASSES6",
+        PGSQL_DELETE_CLIENT_CLASS_WITH_TAG(dhcp6)
+    },
+
+    // Delete all unassigned client classes.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_CLIENT_CLASSES6_UNASSIGNED,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_CLIENT_CLASSES6_UNASSIGNED",
+        PGSQL_DELETE_CLIENT_CLASS_UNASSIGNED(dhcp6)
+    },
+
+    // Delete specified client class.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6,
+        2,
+        {
+            OID_VARCHAR,    // 1 server_tag
+            OID_VARCHAR     // 2 name
+        },
+        "DELETE_CLIENT_CLASS6",
+        PGSQL_DELETE_CLIENT_CLASS_WITH_TAG(dhcp6, AND name = $2)
+    },
+
+    // Delete any client class with a given name.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_CLIENT_CLASS6_ANY,
+        1,
+        {
+            OID_VARCHAR     // 1 name
+        },
+        "DELETE_CLIENT_CLASS6_ANY",
+        PGSQL_DELETE_CLIENT_CLASS_ANY(dhcp6, AND name = $1)
+    },
+
+    // Delete a server by tag.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_SERVER6,
+        1,
+        {
+            OID_VARCHAR // server_tag
+        },
+        "DELETE_SERVER6",
+        PGSQL_DELETE_SERVER(dhcp6)
+    },
+
+    // Deletes all servers except logical server 'all'.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SERVERS6,
+        0,
+        {
+            OID_NONE
+        },
+        "DELETE_ALL_SERVERS6",
+        PGSQL_DELETE_ALL_SERVERS(dhcp6)
+    },
+
+    // Fetches the last sequence id for the given table and column.
+    {
+        // PgSqlConfigBackendDHCPv6Impl::GET_LAST_INSERT_ID6,
+        // args are: table name, sequence column name
+        2,
+        {
+            OID_VARCHAR,
+            OID_VARCHAR
+        },
+        "GET_LAST_INSERT_ID6",
+        "SELECT CURRVAL(PG_GET_SERIAL_SEQUENCE($1, $2))"
+    }
+}
+};
+
+} // end anonymous namespace
+
+PgSqlConfigBackendDHCPv6Impl::PgSqlConfigBackendDHCPv6Impl(const DatabaseConnection::ParameterMap& parameters)
+    : PgSqlConfigBackendImpl(parameters, &PgSqlConfigBackendDHCPv6Impl::dbReconnect,
+      PgSqlConfigBackendDHCPv6Impl::GET_LAST_INSERT_ID6) {
+    // Prepare query statements. Those are will be only used to retrieve
+    // information from the database, so they can be used even if the
+    // database is read only for the current user.
+    conn_.prepareStatements(tagged_statements.begin(),
+                            tagged_statements.end());
+// @todo As part of enabling read-only CB access, statements need to
+// be limited:
+//                            tagged_statements.begin() + WRITE_STMTS_BEGIN);
+
+    // Create unique timer name per instance.
+    timer_name_ = "PgSqlConfigBackend6[";
+    timer_name_ += boost::lexical_cast<std::string>(reinterpret_cast<uint64_t>(this));
+    timer_name_ += "]DbReconnectTimer";
+
+    // Create ReconnectCtl for this connection.
+    conn_.makeReconnectCtl(timer_name_);
+}
+
+PgSqlConfigBackendDHCPv6Impl::~PgSqlConfigBackendDHCPv6Impl() {
+}
+
+PgSqlTaggedStatement&
+PgSqlConfigBackendDHCPv6Impl::getStatement(size_t index) const {
+    if (index >= tagged_statements.size()) {
+        isc_throw(BadValue, "PgSqlConfigBackendDHCPv6Impl::getStatement index: "
+                  << index << ", is invalid");
+    }
+
+    return(tagged_statements[index]);
+}
+
+PgSqlConfigBackendDHCPv6::PgSqlConfigBackendDHCPv6(const DatabaseConnection::ParameterMap& parameters)
+    : impl_(new PgSqlConfigBackendDHCPv6Impl(parameters)), base_impl_(impl_) {
+}
+
+bool
+PgSqlConfigBackendDHCPv6::isUnusable() {
+    return (impl_->conn_.isUnusable());
+}
+
+DatabaseConnection::ParameterMap
+PgSqlConfigBackendDHCPv6::getParameters() const {
+    return (impl_->getParameters());
+}
+
+Subnet6Ptr
+PgSqlConfigBackendDHCPv6::getSubnet6(const ServerSelector& server_selector,
+                                     const std::string& subnet_prefix) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SUBNET6_BY_PREFIX)
+        .arg(subnet_prefix);
+    return (impl_->getSubnet6(server_selector, subnet_prefix));
+}
+
+Subnet6Ptr
+PgSqlConfigBackendDHCPv6::getSubnet6(const ServerSelector& server_selector,
+                                     const SubnetID& subnet_id) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SUBNET6_BY_SUBNET_ID)
+        .arg(subnet_id);
+    return (impl_->getSubnet6(server_selector, subnet_id));
+}
+
+Subnet6Collection
+PgSqlConfigBackendDHCPv6::getAllSubnets6(const ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SUBNETS6);
+    Subnet6Collection subnets;
+    impl_->getAllSubnets6(server_selector, subnets);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SUBNETS6_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+Subnet6Collection
+PgSqlConfigBackendDHCPv6::getModifiedSubnets6(const ServerSelector& server_selector,
+                                              const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_SUBNETS6)
+        .arg(util::ptimeToText(modification_time));
+    Subnet6Collection subnets;
+    impl_->getModifiedSubnets6(server_selector, modification_time, subnets);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_SUBNETS6_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+Subnet6Collection
+PgSqlConfigBackendDHCPv6::getSharedNetworkSubnets6(const ServerSelector& /* server_selector */,
+                                                   const std::string& shared_network_name) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6)
+        .arg(shared_network_name);
+    Subnet6Collection subnets;
+    impl_->getSharedNetworkSubnets6(ServerSelector::ANY(), shared_network_name, subnets);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT)
+        .arg(subnets.size());
+    return (subnets);
+}
+
+SharedNetwork6Ptr
+PgSqlConfigBackendDHCPv6::getSharedNetwork6(const ServerSelector& server_selector,
+                                            const std::string& name) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SHARED_NETWORK6)
+        .arg(name);
+    return (impl_->getSharedNetwork6(server_selector, name));
+}
+
+SharedNetwork6Collection
+PgSqlConfigBackendDHCPv6::getAllSharedNetworks6(const ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SHARED_NETWORKS6);
+    SharedNetwork6Collection shared_networks;
+    impl_->getAllSharedNetworks6(server_selector, shared_networks);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT)
+        .arg(shared_networks.size());
+    return (shared_networks);
+}
+
+SharedNetwork6Collection
+PgSqlConfigBackendDHCPv6::getModifiedSharedNetworks6(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6)
+        .arg(util::ptimeToText(modification_time));
+    SharedNetwork6Collection shared_networks;
+    impl_->getModifiedSharedNetworks6(server_selector, modification_time, shared_networks);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT)
+        .arg(shared_networks.size());
+    return (shared_networks);
+}
+
+OptionDefinitionPtr
+PgSqlConfigBackendDHCPv6::getOptionDef6(const ServerSelector& server_selector,
+                                        const uint16_t code,
+                                        const std::string& space) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_OPTION_DEF6)
+        .arg(code).arg(space);
+    return (impl_->getOptionDef(PgSqlConfigBackendDHCPv6Impl::GET_OPTION_DEF6_CODE_SPACE,
+                                server_selector, code, space));
+}
+
+OptionDefContainer
+PgSqlConfigBackendDHCPv6::getAllOptionDefs6(const ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_OPTION_DEFS6);
+    OptionDefContainer option_defs;
+    impl_->getAllOptionDefs(PgSqlConfigBackendDHCPv6Impl::GET_ALL_OPTION_DEFS6,
+                            server_selector, option_defs);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_OPTION_DEFS6_RESULT)
+        .arg(option_defs.size());
+    return (option_defs);
+}
+
+OptionDefContainer
+PgSqlConfigBackendDHCPv6::getModifiedOptionDefs6(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_OPTION_DEFS6)
+        .arg(util::ptimeToText(modification_time));
+    OptionDefContainer option_defs;
+    impl_->getModifiedOptionDefs(PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_OPTION_DEFS6,
+                                 server_selector, modification_time, option_defs);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT)
+        .arg(option_defs.size());
+    return (option_defs);
+}
+
+OptionDescriptorPtr
+PgSqlConfigBackendDHCPv6::getOption6(const ServerSelector& server_selector,
+                                     const uint16_t code,
+                                     const std::string& space) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_OPTION6)
+        .arg(code).arg(space);
+    return (impl_->getOption(PgSqlConfigBackendDHCPv6Impl::GET_OPTION6_CODE_SPACE,
+                             Option::V6, server_selector, code, space));
+}
+
+OptionContainer
+PgSqlConfigBackendDHCPv6::getAllOptions6(const ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_OPTIONS6);
+    OptionContainer options = impl_->getAllOptions(PgSqlConfigBackendDHCPv6Impl::GET_ALL_OPTIONS6,
+            Option::V6, server_selector);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_OPTIONS6_RESULT)
+        .arg(options.size());
+    return (options);
+}
+
+OptionContainer
+PgSqlConfigBackendDHCPv6::getModifiedOptions6(const ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_OPTIONS6)
+        .arg(util::ptimeToText(modification_time));
+    OptionContainer options = impl_->getModifiedOptions(PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_OPTIONS6,
+            Option::V6, server_selector, modification_time);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_OPTIONS6_RESULT)
+        .arg(options.size());
+    return (options);
+}
+
+StampedValuePtr
+PgSqlConfigBackendDHCPv6::getGlobalParameter6(const ServerSelector& server_selector,
+                                              const std::string& name) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_GLOBAL_PARAMETER6)
+        .arg(name);
+    return (impl_->getGlobalParameter6(server_selector, name));
+}
+
+StampedValueCollection
+PgSqlConfigBackendDHCPv6::getAllGlobalParameters6(const ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6);
+    StampedValueCollection parameters;
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(tag.get());
+        impl_->getGlobalParameters(PgSqlConfigBackendDHCPv6Impl::GET_ALL_GLOBAL_PARAMETERS6,
+                                   in_bindings, parameters);
+    }
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT)
+        .arg(parameters.size());
+    return (parameters);
+}
+
+StampedValueCollection
+PgSqlConfigBackendDHCPv6::getModifiedGlobalParameters6(const db::ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6)
+        .arg(util::ptimeToText(modification_time));
+    StampedValueCollection parameters;
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(tag.get());
+        in_bindings.addTimestamp(modification_time);
+
+        impl_->getGlobalParameters(PgSqlConfigBackendDHCPv6Impl::GET_MODIFIED_GLOBAL_PARAMETERS6,
+                                   in_bindings, parameters);
+    }
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT)
+        .arg(parameters.size());
+    return (parameters);
+}
+
+ClientClassDefPtr
+PgSqlConfigBackendDHCPv6::getClientClass6(const db::ServerSelector& server_selector,
+                                          const std::string& name) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_CLIENT_CLASS6)
+        .arg(name);
+    return (impl_->getClientClass6(server_selector, name));
+}
+
+ClientClassDictionary
+PgSqlConfigBackendDHCPv6::getAllClientClasses6(const db::ServerSelector& server_selector) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_CLIENT_CLASSES6);
+    ClientClassDictionary client_classes;
+    impl_->getAllClientClasses6(server_selector, client_classes);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT)
+        .arg(client_classes.getClasses()->size());
+    return (client_classes);
+}
+
+ClientClassDictionary
+PgSqlConfigBackendDHCPv6::getModifiedClientClasses6(const db::ServerSelector& server_selector,
+                                                    const boost::posix_time::ptime& modification_time) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6)
+        .arg(util::ptimeToText(modification_time));
+    ClientClassDictionary client_classes;
+    impl_->getModifiedClientClasses6(server_selector, modification_time, client_classes);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT)
+        .arg(client_classes.getClasses()->size());
+    return (client_classes);
+}
+
+AuditEntryCollection
+PgSqlConfigBackendDHCPv6::getRecentAuditEntries(const db::ServerSelector& server_selector,
+        const boost::posix_time::ptime& modification_time,
+        const uint64_t& modification_id) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6)
+      .arg(util::ptimeToText(modification_time))
+      .arg(modification_id);
+    AuditEntryCollection audit_entries;
+    impl_->getRecentAuditEntries(PgSqlConfigBackendDHCPv6Impl::GET_AUDIT_ENTRIES6_TIME,
+                                 server_selector, modification_time,
+                                 modification_id, audit_entries);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT)
+        .arg(audit_entries.size());
+    return (audit_entries);
+}
+
+ServerCollection
+PgSqlConfigBackendDHCPv6::getAllServers6() const {
+    ServerCollection servers;
+
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SERVERS6);
+    impl_->getAllServers(PgSqlConfigBackendDHCPv6Impl::GET_ALL_SERVERS6,
+                         servers);
+
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_ALL_SERVERS6_RESULT)
+        .arg(servers.size());
+    return (servers);
+}
+
+ServerPtr
+PgSqlConfigBackendDHCPv6::getServer6(const data::ServerTag& server_tag) const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_SERVER6)
+        .arg(server_tag.get());
+    return (impl_->getServer(PgSqlConfigBackendDHCPv6Impl::GET_SERVER6, server_tag));
+}
+
+void
+PgSqlConfigBackendDHCPv6::createUpdateSubnet6(const ServerSelector& server_selector,
+                                              const Subnet6Ptr& subnet) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_SUBNET6)
+        .arg(subnet);
+    impl_->createUpdateSubnet6(server_selector, subnet);
+}
+
+void
+PgSqlConfigBackendDHCPv6::createUpdateSharedNetwork6(const ServerSelector& server_selector,
+                                                     const SharedNetwork6Ptr& shared_network) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK6)
+        .arg(shared_network->getName());
+    impl_->createUpdateSharedNetwork6(server_selector, shared_network);
+}
+
+void
+PgSqlConfigBackendDHCPv6::createUpdateOptionDef6(const ServerSelector& server_selector,
+                                                 const OptionDefinitionPtr& option_def) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_OPTION_DEF6)
+        .arg(option_def->getName()).arg(option_def->getCode());
+    impl_->createUpdateOptionDef6(server_selector, option_def);
+}
+
+void
+PgSqlConfigBackendDHCPv6::createUpdateOption6(const ServerSelector& server_selector,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_OPTION6);
+    impl_->createUpdateOption6(server_selector, option);
+}
+
+void
+PgSqlConfigBackendDHCPv6::createUpdateOption6(const db::ServerSelector& server_selector,
+                                              const std::string& shared_network_name,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6)
+        .arg(shared_network_name);
+    impl_->createUpdateOption6(server_selector, shared_network_name, option, false);
+}
+
+void
+PgSqlConfigBackendDHCPv6::createUpdateOption6(const ServerSelector& server_selector,
+                                              const SubnetID& subnet_id,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6)
+        .arg(subnet_id);
+    impl_->createUpdateOption6(server_selector, subnet_id, option, false);
+}
+
+void
+PgSqlConfigBackendDHCPv6::createUpdateOption6(const ServerSelector& server_selector,
+                                              const asiolink::IOAddress& pool_start_address,
+                                              const asiolink::IOAddress& pool_end_address,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6)
+        .arg(pool_start_address.toText()).arg(pool_end_address.toText());
+    impl_->createUpdateOption6(server_selector, pool_start_address, pool_end_address,
+                               option);
+}
+
+void
+PgSqlConfigBackendDHCPv6::createUpdateOption6(const ServerSelector& server_selector,
+                                              const asiolink::IOAddress& pd_pool_prefix,
+                                              const uint8_t pd_pool_prefix_length,
+                                              const OptionDescriptorPtr& option) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6)
+        .arg(pd_pool_prefix.toText()).arg(pd_pool_prefix_length);
+    impl_->createUpdateOption6(server_selector, pd_pool_prefix,
+                               pd_pool_prefix_length, option);
+}
+
+void
+PgSqlConfigBackendDHCPv6::createUpdateGlobalParameter6(const ServerSelector& server_selector,
+                                                       const StampedValuePtr& value) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6)
+        .arg(value->getName());
+    impl_->createUpdateGlobalParameter6(server_selector, value);
+}
+
+void
+PgSqlConfigBackendDHCPv6::createUpdateClientClass6(const db::ServerSelector& server_selector,
+                                                   const ClientClassDefPtr& client_class,
+                                                   const std::string& follow_class_name) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS6)
+        .arg(client_class->getName());
+    impl_->createUpdateClientClass6(server_selector, client_class, follow_class_name);
+}
+
+void
+PgSqlConfigBackendDHCPv6::createUpdateServer6(const ServerPtr& server) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_CREATE_UPDATE_SERVER6)
+        .arg(server->getServerTagAsText());
+    impl_->createUpdateServer(PgSqlConfigBackendDHCPv6Impl::CREATE_AUDIT_REVISION,
+                              PgSqlConfigBackendDHCPv6Impl::INSERT_SERVER6,
+                              PgSqlConfigBackendDHCPv6Impl::UPDATE_SERVER6,
+                              server);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteSubnet6(const ServerSelector& server_selector,
+                                        const std::string& subnet_prefix) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_PREFIX_SUBNET6)
+        .arg(subnet_prefix);
+    uint64_t result = impl_->deleteSubnet6(server_selector, subnet_prefix);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteSubnet6(const ServerSelector& server_selector,
+                                        const SubnetID& subnet_id) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6)
+        .arg(subnet_id);
+    uint64_t result = impl_->deleteSubnet6(server_selector, subnet_id);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteAllSubnets6(const ServerSelector& server_selector) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SUBNETS6);
+
+    int index = (server_selector.amUnassigned() ?
+                 PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6_UNASSIGNED :
+                 PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all subnets",
+                                                 "deleted all subnets", true);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SUBNETS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteSharedNetworkSubnets6(const db::ServerSelector& server_selector,
+                                                      const std::string& shared_network_name) {
+    if (!server_selector.amAny()) {
+        isc_throw(InvalidOperation, "deleting all subnets from a shared "
+                  "network requires using ANY server selector");
+    }
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6)
+        .arg(shared_network_name);
+    uint64_t result = impl_->deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SUBNETS6_SHARED_NETWORK_NAME,
+                                                 server_selector,
+                                                 "deleting all subnets for a shared network",
+                                                 "deleted all subnets for a shared network",
+                                                 true, shared_network_name);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteSharedNetwork6(const ServerSelector& server_selector,
+                                               const std::string& name) {
+    /// @todo Using UNASSIGNED selector is allowed by the CB API but we don't have
+    /// dedicated query for this at the moment. The user should use ANY to delete
+    /// the shared network by name.
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "deleting an unassigned shared network requires "
+                  "an explicit server tag or using ANY server. The UNASSIGNED server "
+                  "selector is currently not supported");
+    }
+
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK6)
+        .arg(name);
+
+    int index = (server_selector.amAny() ?
+                 PgSqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_NAME_ANY :
+                 PgSqlConfigBackendDHCPv6Impl::DELETE_SHARED_NETWORK6_NAME_WITH_TAG);
+    uint64_t result = impl_->deleteTransactional(index, server_selector,
+                                                 "deleting a shared network",
+                                                 "shared network deleted", true, name);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteAllSharedNetworks6(const ServerSelector& server_selector) {
+    if (server_selector.amAny()) {
+        isc_throw(InvalidOperation, "deleting all shared networks for ANY server is not"
+                  " supported");
+    }
+
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6);
+
+    int index = (server_selector.amUnassigned() ?
+                 PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SHARED_NETWORKS6_UNASSIGNED :
+                 PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_SHARED_NETWORKS6);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all shared networks",
+                                                 "deleted all shared networks", true);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteOptionDef6(const ServerSelector& server_selector,
+                                           const uint16_t code,
+                                           const std::string& space) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_OPTION_DEF6)
+        .arg(code).arg(space);
+    uint64_t result = impl_->deleteOptionDef6(server_selector, code, space);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_OPTION_DEF6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteAllOptionDefs6(const ServerSelector& server_selector) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_OPTION_DEFS6);
+    uint64_t result = impl_->deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_OPTION_DEFS6,
+                                                 server_selector, "deleting all option definitions",
+                                                 "deleted all option definitions", true);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteOption6(const ServerSelector& server_selector,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_OPTION6)
+        .arg(code).arg(space);
+    uint64_t result = impl_->deleteOption6(server_selector, code, space);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_OPTION6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteOption6(const ServerSelector& /* server_selector */,
+                                        const std::string& shared_network_name,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6)
+        .arg(shared_network_name).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption6(ServerSelector::ANY(), shared_network_name,
+                                           code, space);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteOption6(const ServerSelector& /* server_selector */,
+                                        const SubnetID& subnet_id,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6)
+        .arg(subnet_id).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption6(ServerSelector::ANY(), subnet_id, code, space);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteOption6(const ServerSelector& /* server_selector */,
+                                        const asiolink::IOAddress& pool_start_address,
+                                        const asiolink::IOAddress& pool_end_address,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    /// @todo In the future we might use the server selector to make sure that the
+    /// option is only deleted if the pool belongs to a given server. For now, we
+    /// just delete it when there is a match with the parent object.
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_POOL_OPTION6)
+        .arg(pool_start_address.toText()).arg(pool_end_address.toText()).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption6(ServerSelector::ANY(), pool_start_address,
+                                           pool_end_address, code, space);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_POOL_OPTION6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteOption6(const ServerSelector& /* server_selector */,
+                                        const asiolink::IOAddress& pd_pool_prefix,
+                                        const uint8_t pd_pool_prefix_length,
+                                        const uint16_t code,
+                                        const std::string& space) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6)
+        .arg(pd_pool_prefix.toText()).arg(pd_pool_prefix_length).arg(code).arg(space);
+    uint64_t result = impl_->deleteOption6(ServerSelector::ANY(), pd_pool_prefix,
+                                           pd_pool_prefix_length, code, space);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteGlobalParameter6(const ServerSelector& server_selector,
+                                                 const std::string& name) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_GLOBAL_PARAMETER6)
+        .arg(name);
+    uint64_t result = impl_->deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_GLOBAL_PARAMETER6,
+                                                 server_selector, "deleting global parameter",
+                                                 "global parameter deleted", false, name);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteAllGlobalParameters6(const ServerSelector& server_selector) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6);
+    uint64_t result = impl_->deleteTransactional(PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_GLOBAL_PARAMETERS6,
+                                                 server_selector, "deleting all global parameters",
+                                                 "all global parameters deleted", true);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteClientClass6(const db::ServerSelector& server_selector,
+                                             const std::string& name) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_CLIENT_CLASS6)
+        .arg(name);
+    auto result = impl_->deleteClientClass6(server_selector, name);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_CLIENT_CLASS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteAllClientClasses6(const db::ServerSelector& server_selector) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6);
+
+    int index = (server_selector.amUnassigned() ?
+                 PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_CLIENT_CLASSES6_UNASSIGNED :
+                 PgSqlConfigBackendDHCPv6Impl::DELETE_ALL_CLIENT_CLASSES6);
+    uint64_t result = impl_->deleteTransactional(index, server_selector, "deleting all client classes",
+                                                 "deleted all client classes", true);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteServer6(const ServerTag& server_tag) {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SERVER6)
+        .arg(server_tag.get());
+    uint64_t result = impl_->deleteServer6(server_tag);
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_SERVER6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+uint64_t
+PgSqlConfigBackendDHCPv6::deleteAllServers6() {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SERVERS6);
+    uint64_t result = impl_->deleteAllServers6();
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_DELETE_ALL_SERVERS6_RESULT)
+        .arg(result);
+    return (result);
+}
+
+std::string
+PgSqlConfigBackendDHCPv6::getType() const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_TYPE6);
+    return (impl_->getType());
+}
+
+std::string
+PgSqlConfigBackendDHCPv6::getHost() const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_HOST6);
+    return (impl_->getHost());
+}
+
+uint16_t
+PgSqlConfigBackendDHCPv6::getPort() const {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_GET_PORT6);
+    return (impl_->getPort());
+}
+
+bool
+PgSqlConfigBackendDHCPv6::registerBackendType() {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_REGISTER_BACKEND_TYPE6);
+    return (
+        dhcp::ConfigBackendDHCPv6Mgr::instance().registerBackendFactory("postgresql",
+            [](const db::DatabaseConnection::ParameterMap& params) -> dhcp::ConfigBackendDHCPv6Ptr {
+            return (dhcp::PgSqlConfigBackendDHCPv6Ptr(new dhcp::PgSqlConfigBackendDHCPv6(params)));
+        })
+    );
+}
+
+void
+PgSqlConfigBackendDHCPv6::unregisterBackendType() {
+    LOG_DEBUG(pgsql_cb_logger, DBGLVL_TRACE_BASIC, PGSQL_CB_UNREGISTER_BACKEND_TYPE6);
+    dhcp::ConfigBackendDHCPv6Mgr::instance().unregisterBackendFactory("postgresql");
+}
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp6.h b/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp6.h
new file mode 100644
index 0000000..e3f08f5
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_dhcp6.h
@@ -0,0 +1,664 @@
+// Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PGSQL_CONFIG_BACKEND_DHCP6_H
+#define PGSQL_CONFIG_BACKEND_DHCP6_H
+
+#include <pgsql_cb_impl.h>
+#include <database/database_connection.h>
+#include <dhcpsrv/client_class_def.h>
+#include <dhcpsrv/config_backend_dhcp6.h>
+#include <pgsql_cb_log.h>
+#include <boost/shared_ptr.hpp>
+
+namespace isc {
+namespace dhcp {
+
+class PgSqlConfigBackendDHCPv6Impl;
+
+/// @brief Implementation of the PgSql Configuration Backend for
+/// Kea DHCPv6 server.
+///
+/// All POSIX times specified in the methods belonging to this
+/// class must be local times.
+///
+/// The server selection mechanisms used by this backend generally adhere
+/// to the rules described for @c ConfigBackendDHCPv6, but support for
+/// some of the selectors is not implemented. Whenever this is the case,
+/// the methods throw @c isc::NotImplemented exception.
+class PgSqlConfigBackendDHCPv6 : public ConfigBackendDHCPv6 {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit PgSqlConfigBackendDHCPv6(const db::DatabaseConnection::ParameterMap& parameters);
+
+    /// @brief Retrieves a single subnet by subnet_prefix.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be retrieved.
+    /// @return Pointer to the retrieved subnet or NULL if not found.
+    virtual Subnet6Ptr
+    getSubnet6(const db::ServerSelector& server_selector,
+               const std::string& subnet_prefix) const;
+
+    /// @brief Retrieves a single subnet by subnet identifier.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of a subnet to be retrieved.
+    /// @return Pointer to the retrieved subnet or NULL if not found.
+    virtual Subnet6Ptr
+    getSubnet6(const db::ServerSelector& server_selector, const SubnetID& subnet_id) const;
+
+    /// @brief Retrieves all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet6Collection
+    getAllSubnets6(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves subnets modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound subnet modification time.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet6Collection
+    getModifiedSubnets6(const db::ServerSelector& server_selector,
+                        const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves all subnets belonging to a specified shared network.
+    ///
+    /// The server selector is currently ignored by this method. All subnets
+    /// for the given shared network are returned regardless of their
+    /// associations with the servers.
+    ///
+    /// @param server_selector Server selector (currently ignored).
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be retrieved.
+    /// @return Collection of subnets or empty collection if no subnet found.
+    virtual Subnet6Collection
+    getSharedNetworkSubnets6(const db::ServerSelector& server_selector,
+                             const std::string& shared_network_name) const;
+
+    /// @brief Retrieves shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the shared network to be retrieved.
+    /// @return Pointer to the shared network or NULL if not found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual SharedNetwork6Ptr
+    getSharedNetwork6(const db::ServerSelector& server_selector,
+                      const std::string& name) const;
+
+    /// @brief Retrieves all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of shared network or empty collection if
+    /// no shared network found.
+    virtual SharedNetwork6Collection
+    getAllSharedNetworks6(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves shared networks modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound shared network modification time.
+    /// @return Collection of shared network or empty collection if
+    /// no shared network found.
+    virtual SharedNetwork6Collection
+    getModifiedSharedNetworks6(const db::ServerSelector& server_selector,
+                               const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves single option definition by code and space.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be retrieved.
+    /// @param space Option space of the option to be retrieved.
+    /// @return Pointer to the option definition or NULL if not found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual OptionDefinitionPtr
+    getOptionDef6(const db::ServerSelector& server_selector, const uint16_t code,
+                  const std::string& space) const;
+
+    /// @brief Retrieves all option definitions.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of option definitions or empty collection if
+    /// no option definition found.
+    virtual OptionDefContainer
+    getAllOptionDefs6(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves option definitions modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound option definition modification
+    /// time.
+    /// @return Collection of option definitions or empty collection if
+    /// no option definition found.
+    virtual OptionDefContainer
+    getModifiedOptionDefs6(const db::ServerSelector& server_selector,
+                           const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves single option by code and space.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Pointer to the retrieved option descriptor or null if
+    /// no option was found.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual OptionDescriptorPtr
+    getOption6(const db::ServerSelector& server_selector, const uint16_t code,
+               const std::string& space) const;
+
+    /// @brief Retrieves all global options.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Collection of global options or empty collection if no
+    /// option found.
+    virtual OptionContainer
+    getAllOptions6(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves option modified after specified time.
+    ///
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound option modification time.
+    /// @return Collection of global options or empty collection if no
+    /// option found.
+    virtual OptionContainer
+    getModifiedOptions6(const db::ServerSelector& server_selector,
+                        const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves global parameter value.
+    ///
+    /// Typically, the server selector used for this query should be set to
+    /// ONE. It is possible to use the MULTIPLE server selector but in that
+    /// case only the first found parameter is returned.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter to be retrieved.
+    /// @return Value of the global parameter.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual data::StampedValuePtr
+    getGlobalParameter6(const db::ServerSelector& server_selector,
+                        const std::string& name) const;
+
+    /// @brief Retrieves all global parameters.
+    ///
+    /// Using the server selector it is possible to fetch the parameters for
+    /// one or more servers. The following list describes what parameters are
+    /// returned depending on the server selector specified:
+    /// - ALL: only common parameters are returned which are associated with
+    ///   the logical server 'all'. No parameters associated with the explicit
+    ///   server tags are returned.
+    ///
+    /// - ONE: parameters used by the particular sever are returned. This includes
+    ///   parameters associated with the particular server (identified by tag)
+    ///   and parameters associated with the logical server 'all' when server
+    ///   specific parameters are not given. For example, if there is a
+    ///   renew-timer specified for 'server1' tag, different value of the
+    ///   renew-timer specified for 'all' servers and a rebind-timer specified
+    ///   for 'all' servers, the caller will receive renew-timer value associated
+    ///   with the server1 and the rebind-timer value associated with all servers,
+    ///   because there is no explicit rebind-timer specified for server1.
+    ///
+    /// - MULTIPLE: parameters used by multiple servers, but those associated
+    ///   with specific server tags take precedence over the values specified for
+    ///   'all' servers. This is similar to the case of ONE server described
+    ///   above. The effect of querying for parameters belonging to multiple
+    ///   servers is the same as issuing multiple queries with ONE server
+    ///   being selected multiple times.
+    ///
+    /// - UNASSIGNED: parameters not associated with any servers.
+    ///
+    ///
+    /// @param server_selector Server selector.
+    virtual data::StampedValueCollection
+    getAllGlobalParameters6(const db::ServerSelector& server_selector) const;
+
+    /// @brief Retrieves global parameters modified after specified time.
+    ///
+    /// @param modification_time Lower bound modification time.
+    /// @return Collection of modified global parameters.
+    virtual data::StampedValueCollection
+    getModifiedGlobalParameters6(const db::ServerSelector& server_selector,
+                                 const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves a client class by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Client class name.
+    /// @return Pointer to the retrieved client class.
+    virtual ClientClassDefPtr
+    getClientClass6(const db::ServerSelector& selector, const std::string& name) const;
+
+    /// @brief Retrieves all client classes.
+    ///
+    /// @param selector Server selector.
+    /// @return Collection of client classes.
+    virtual ClientClassDictionary
+    getAllClientClasses6(const db::ServerSelector& selector) const;
+
+    /// @brief Retrieves client classes modified after specified time.
+    ///
+    /// @param selector Server selector.
+    /// @param modification_time Modification time.
+    /// @return Collection of client classes.
+    virtual ClientClassDictionary
+    getModifiedClientClasses6(const db::ServerSelector& selector,
+                              const boost::posix_time::ptime& modification_time) const;
+
+    /// @brief Retrieves the most recent audit entries.
+    ///
+    /// @param selector Server selector.
+    /// @param modification_time Timestamp being a lower limit for the returned
+    /// result set, i.e. entries later than specified time are returned.
+    /// @param modification_id Identifier being a lower limit for the returned
+    /// result set, used when two (or more) entries have the same
+    /// modification_time.
+    /// @return Collection of audit entries.
+    virtual db::AuditEntryCollection
+    getRecentAuditEntries(const db::ServerSelector& server_selector,
+                          const boost::posix_time::ptime& modification_time,
+                          const uint64_t& modification_id) const;
+
+    /// @brief Retrieves all servers.
+    ///
+    /// This method returns the list of servers excluding the logical server
+    /// 'all'.
+    ///
+    /// @return Collection of servers from the backend.
+    virtual db::ServerCollection
+    getAllServers6() const;
+
+    /// @brief Retrieves a server.
+    ///
+    /// @param server_tag Tag of the server to be retrieved.
+    /// @return Pointer to the server instance or null pointer if no server
+    /// with the particular tag was found.
+    virtual db::ServerPtr
+    getServer6(const data::ServerTag& server_tag) const;
+
+    /// @brief Creates or updates a subnet.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet Subnet to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateSubnet6(const db::ServerSelector& server_selector,
+                        const Subnet6Ptr& subnet);
+
+    /// @brief Creates or updates a shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network Shared network to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateSharedNetwork6(const db::ServerSelector& server_selector,
+                               const SharedNetwork6Ptr& shared_network);
+
+    /// @brief Creates or updates an option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option_def Option definition to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOptionDef6(const db::ServerSelector& server_selector,
+                           const OptionDefinitionPtr& option_def);
+
+    /// @brief Creates or updates global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption6(const db::ServerSelector& server_selector,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of a shared network to which option
+    /// belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption6(const db::ServerSelector& server_selector,
+                        const std::string& shared_network_name,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of a subnet to which option belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption6(const db::ServerSelector& server_selector,
+                        const SubnetID& subnet_id,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool to which
+    /// the option belongs.
+    /// @param pool_end_address Upper bound address of the pool to which the
+    /// option belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption6(const db::ServerSelector& server_selector,
+                        const asiolink::IOAddress& pool_start_address,
+                        const asiolink::IOAddress& pool_end_address,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates prefix delegation pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pd_pool_prefix Address part of the prefix of the prefix
+    /// delegation pool to which the option belongs.
+    /// @param pd_pool_prefix_length Prefix length of the prefix
+    /// delegation pool to which the option belongs.
+    /// @param option Option to be added or updated.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateOption6(const db::ServerSelector& server_selector,
+                        const asiolink::IOAddress& pd_pool_prefix,
+                        const uint8_t pd_pool_prefix_length,
+                        const OptionDescriptorPtr& option);
+
+    /// @brief Creates or updates global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter.
+    /// @param value Value of the global parameter.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual void
+    createUpdateGlobalParameter6(const db::ServerSelector& server_selector,
+                                 const data::StampedValuePtr& value);
+
+    /// @brief Creates or updates DHCPv6 client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param client_class Client class to be added or updated.
+    /// @param follow_class_name name of the class after which the
+    /// new or updated class should be positioned. An empty value
+    /// causes the class to be appended at the end of the class
+    /// hierarchy.
+    virtual void
+    createUpdateClientClass6(const db::ServerSelector& server_selector,
+                             const ClientClassDefPtr& client_class,
+                             const std::string& follow_class_name);
+
+    /// @brief Creates or updates a server.
+    ///
+    /// @param server Instance of the server to be stored.
+    /// @throw InvalidOperation when trying to create a duplicate or
+    /// update the logical server 'all'.
+    virtual void
+    createUpdateServer6(const db::ServerPtr& server);
+
+    /// @brief Deletes subnet by prefix.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_prefix Prefix of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSubnet6(const db::ServerSelector& server_selector,
+                  const std::string& subnet_prefix);
+
+    /// @brief Deletes subnet by identifier.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to be deleted.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSubnet6(const db::ServerSelector& server_selector, const SubnetID& subnet_id);
+
+    /// @brief Deletes all subnets.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted subnets.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllSubnets6(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes all subnets belonging to a specified shared network.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network for which the
+    /// subnets should be deleted.
+    /// @return Number of deleted subnets.
+    virtual uint64_t
+    deleteSharedNetworkSubnets6(const db::ServerSelector& server_selector,
+                                const std::string& shared_network_name);
+
+    /// @brief Deletes shared network by name.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the shared network to be deleted.
+    /// @return Number of deleted shared networks.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteSharedNetwork6(const db::ServerSelector& server_selector,
+                         const std::string& name);
+
+    /// @brief Deletes all shared networks.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted shared networks.
+    virtual uint64_t
+    deleteAllSharedNetworks6(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be deleted.
+    /// @param space Option space of the option to be deleted.
+    /// @return Number of deleted option definitions.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOptionDef6(const db::ServerSelector& server_selector, const uint16_t code,
+                     const std::string& space);
+
+    /// @brief Deletes all option definitions.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted option definitions.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllOptionDefs6(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes global option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param code Code of the option to be deleted.
+    /// @param space Option space of the option to be deleted.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption6(const db::ServerSelector& server_selector, const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes shared network level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Name of the shared network which deleted
+    /// option belongs to
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption6(const db::ServerSelector& server_selector,
+                  const std::string& shared_network_name,
+                  const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes subnet level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param subnet_id Identifier of the subnet to which deleted option
+    /// belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption6(const db::ServerSelector& server_selector, const SubnetID& subnet_id,
+                  const uint16_t code, const std::string& space);
+
+    /// @brief Deletes pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the pool to which
+    /// deleted option belongs.
+    /// @param pool_end_address Upper bound address of the pool to which the
+    /// deleted option belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption6(const db::ServerSelector& server_selector,
+                  const asiolink::IOAddress& pool_start_address,
+                  const asiolink::IOAddress& pool_end_address,
+                  const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes prefix delegation pool level option.
+    ///
+    /// @param server_selector Server selector.
+    /// @param pool_start_address Lower bound address of the prefix
+    /// delegation pool to which deleted option belongs.
+    /// @param pool_end_address Upper bound address of the prefix
+    /// delegation pool to which the deleted option belongs.
+    /// @param code Code of the deleted option.
+    /// @param space Option space of the deleted option.
+    /// @return Number of deleted options.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteOption6(const db::ServerSelector& server_selector,
+                  const asiolink::IOAddress& pd_pool_prefix,
+                  const uint8_t pd_pool_prefix_length,
+                  const uint16_t code,
+                  const std::string& space);
+
+    /// @brief Deletes global parameter.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the global parameter to be deleted.
+    /// @return Number of deleted global parameters.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteGlobalParameter6(const db::ServerSelector& server_selector,
+                           const std::string& name);
+
+    /// @brief Deletes all global parameters.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted global parameters.
+    /// @throw NotImplemented if server selector is "unassigned".
+    virtual uint64_t
+    deleteAllGlobalParameters6(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes DHCPv6 client class.
+    ///
+    /// @param server_selector Server selector.
+    /// @param name Name of the class to be deleted.
+    /// @return Number of deleted client classes.
+    virtual uint64_t
+    deleteClientClass6(const db::ServerSelector& server_selector,
+                       const std::string& name);
+
+    /// @brief Deletes all client classes.
+    ///
+    /// @param server_selector Server selector.
+    /// @return Number of deleted client classes.
+    virtual uint64_t
+    deleteAllClientClasses6(const db::ServerSelector& server_selector);
+
+    /// @brief Deletes a server from the backend.
+    ///
+    /// @param server_tag Tag of the server to be deleted.
+    /// @return Number of deleted servers.
+    /// @throw isc::InvalidOperation when trying to delete the logical
+    /// server 'all'.
+    virtual uint64_t
+    deleteServer6(const data::ServerTag& server_tag);
+
+    /// @brief Deletes all servers from the backend except the logical
+    /// server 'all'.
+    ///
+    /// @return Number of deleted servers.
+    virtual uint64_t
+    deleteAllServers6();
+
+    /// @brief Returns backend type in the textual format.
+    ///
+    /// @return "postgresql".
+    virtual std::string getType() const;
+
+    /// @brief Returns backend host.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return host on which the database is located.
+    virtual std::string getHost() const;
+
+    /// @brief Returns backend port number.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return Port number on which database service is available.
+    virtual uint16_t getPort() const;
+
+    /// @brief Registers the PgSQL backend factory with backend config manager
+    ///
+    /// This should be called by the hook lib load() function.
+    /// @return True if the factory was registered successfully, false otherwise.
+    static bool registerBackendType();
+
+    /// @brief Unregisters the PgSQL backend factory and discards PgSQL backends
+    ///
+    /// This should be called by the hook lib unload() function.
+    static void unregisterBackendType();
+
+    /// @brief Flag which indicates if the config backend has an unusable
+    /// connection.
+    ///
+    /// @return true if there is at least one unusable connection, false
+    /// otherwise
+    virtual bool isUnusable();
+
+    /// @brief Return backend parameters
+    ///
+    /// Returns the backend parameters
+    ///
+    /// @return Parameters of the backend.
+    isc::db::DatabaseConnection::ParameterMap getParameters() const;
+
+protected:
+
+    /// @brief Pointer to the implementation of the @c PgSqlConfigBackendDHCPv6
+    /// class.
+    boost::shared_ptr<PgSqlConfigBackendDHCPv6Impl> impl_;
+
+    /// @brief Pointer to the base implementation of the backend shared by
+    /// DHCPv4 and DHCPv6 servers.
+    boost::shared_ptr<PgSqlConfigBackendImpl> base_impl_;
+};
+
+/// @brief Pointer to the @c PgSqlConfigBackendDHCPv6 class.
+typedef boost::shared_ptr<PgSqlConfigBackendDHCPv6> PgSqlConfigBackendDHCPv6Ptr;
+
+} // end of namespace isc::cb
+} // end of namespace isc
+
+#endif // PGSQL_CONFIG_BACKEND_DHCP6_H
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_impl.cc b/src/hooks/dhcp/pgsql_cb/pgsql_cb_impl.cc
new file mode 100644
index 0000000..c8addbf
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_impl.cc
@@ -0,0 +1,1148 @@
+// Copyright (C) 2021-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <asiolink/io_address.h>
+#include <config_backend/constants.h>
+#include <dhcp/option_space.h>
+#include <database/db_exceptions.h>
+#include <pgsql/pgsql_exchange.h>
+#include <util/buffer.h>
+
+#include <pgsql_cb_impl.h>
+#include <pgsql_cb_log.h>
+#include <cstdint>
+#include <utility>
+
+using namespace isc::asiolink;
+using namespace isc::cb;
+using namespace isc::data;
+using namespace isc::db;
+using namespace isc::util;
+
+namespace isc {
+namespace dhcp {
+
+isc::asiolink::IOServicePtr PgSqlConfigBackendImpl::io_service_ = isc::asiolink::IOServicePtr();
+
+PgSqlTaggedStatement&
+PgSqlConfigBackendImpl::getStatement(size_t /* index */) const {
+    isc_throw(NotImplemented, "derivations must override this");
+}
+
+void
+PgSqlConfigBackendImpl::selectQuery(size_t index,
+                                    const PsqlBindArray& in_bindings,
+                                    PgSqlConnection::ConsumeResultRowFun process_result_row) {
+    conn_.selectQuery(getStatement(index), in_bindings, process_result_row);
+}
+
+void
+PgSqlConfigBackendImpl::insertQuery(size_t index,
+                                    const PsqlBindArray& in_bindings) {
+    conn_.insertQuery(getStatement(index), in_bindings);
+}
+
+uint64_t
+PgSqlConfigBackendImpl::updateDeleteQuery(size_t index,
+                                          const PsqlBindArray& in_bindings) {
+    return(conn_.updateDeleteQuery(getStatement(index), in_bindings));
+}
+
+PgSqlConfigBackendImpl::ScopedAuditRevision::ScopedAuditRevision(
+    PgSqlConfigBackendImpl* impl,
+    const int index,
+    const ServerSelector& server_selector,
+    const std::string& log_message,
+    bool cascade_transaction)
+    : impl_(impl) {
+    impl_->createAuditRevision(index, server_selector,
+                               boost::posix_time::microsec_clock::local_time(),
+                               log_message,
+                               cascade_transaction);
+}
+
+PgSqlConfigBackendImpl::ScopedAuditRevision::~ScopedAuditRevision() {
+    impl_->clearAuditRevision();
+}
+
+PgSqlConfigBackendImpl::PgSqlConfigBackendImpl(const DatabaseConnection::ParameterMap& parameters,
+                                               const DbCallback db_reconnect_callback,
+                                               size_t last_insert_id_index)
+    : conn_(parameters,
+            IOServiceAccessorPtr(new IOServiceAccessor(PgSqlConfigBackendImpl::getIOService)),
+            db_reconnect_callback), timer_name_(""),
+            audit_revision_ref_count_(0), parameters_(parameters),
+            last_insert_id_index_(last_insert_id_index) {
+
+    // Check TLS support.
+    size_t tls(0);
+    tls += parameters.count("trust-anchor");
+    tls += parameters.count("cert-file");
+    tls += parameters.count("key-file");
+    tls += parameters.count("cipher-list");
+#ifdef HAVE_PGSQL_SSL
+    if ((tls > 0) && !PgSqlConnection::warned_about_tls) {
+        PgSqlConnection::warned_about_tls = true;
+        LOG_INFO(pgsql_cb_logger, PGSQL_CB_TLS_SUPPORT)
+            .arg(DatabaseConnection::redactedAccessString(parameters);
+        PQinitSSL(1);
+    }
+#else
+    if (tls > 0) {
+        LOG_ERROR(pgsql_cb_logger, PGSQL_CB_NO_TLS_SUPPORT)
+            .arg(DatabaseConnection::redactedAccessString(parameters));
+        isc_throw(DbOpenError, "Attempt to configure TLS for PostgreSQL "
+                  << "backend (built with this feature disabled)");
+    }
+#endif
+
+    // Test schema version first.
+    std::pair<uint32_t, uint32_t> code_version(PGSQL_SCHEMA_VERSION_MAJOR, PGSQL_SCHEMA_VERSION_MINOR);
+    std::pair<uint32_t, uint32_t> db_version = PgSqlConnection::getVersion(parameters);
+    if (code_version != db_version) {
+        isc_throw(DbOpenError, "PostgreSQL schema version mismatch: need version: "
+                  << code_version.first << "." << code_version.second
+                  << " found version: " << db_version.first << "."
+                  << db_version.second);
+    }
+
+    // Open the database.
+    conn_.openDatabase();
+}
+
+PgSqlConfigBackendImpl::~PgSqlConfigBackendImpl() {
+    /// nothing to do there. The conn_ connection will be deleted and its dtor
+    /// will take care of releasing the compiled statements and similar.
+}
+
+void
+PgSqlConfigBackendImpl::createAuditRevision(const int index,
+                                            const ServerSelector& server_selector,
+                                            const boost::posix_time::ptime& audit_ts,
+                                            const std::string& log_message,
+                                            const bool cascade_transaction) {
+    // Do not touch existing audit revision in case of the cascade update.
+    if (++audit_revision_ref_count_ > 1) {
+        return;
+    }
+
+    /// @todo The audit trail is not really well prepared to handle multiple server
+    /// tags or no server tags. Therefore, if the server selector appears to be
+    /// pointing to multiple servers, no servers or any server we simply associate the
+    /// audit revision with all servers. The only case when we create a dedicated
+    /// audit entry is when there is a single server tag, i.e. "all" or explicit
+    /// server name. In fact, these are the most common two cases.
+    std::string tag = ServerTag::ALL;
+    auto const& tags = server_selector.getTags();
+    if (tags.size() == 1) {
+        tag = tags.begin()->get();
+    }
+
+    PsqlBindArray in_bindings;
+    in_bindings.addTimestamp(audit_ts);
+    in_bindings.add(tag);
+    in_bindings.add(log_message);
+    in_bindings.add(cascade_transaction);
+
+    insertQuery(index, in_bindings);
+}
+
+void
+PgSqlConfigBackendImpl::clearAuditRevision() {
+    if (audit_revision_ref_count_ <= 0) {
+        isc_throw(Unexpected, "attempted to clear audit revision that does not exist - coding error");
+    }
+    --audit_revision_ref_count_;
+}
+
+void
+PgSqlConfigBackendImpl::getRecentAuditEntries(const int index,
+                                              const db::ServerSelector& server_selector,
+                                              const boost::posix_time::ptime& modification_time,
+                                              const uint64_t& modification_id,
+                                              AuditEntryCollection& audit_entries) {
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        // Create the input parameters.
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(tag.get());
+        in_bindings.addTimestamp(modification_time);
+        in_bindings.add(modification_id);
+
+        // Execute select.
+        selectQuery(index, in_bindings,
+                    [&audit_entries] (PgSqlResult& r, int row) {
+            // Extract the column values for r[row].
+            // Create a worker for the row.
+            PgSqlResultRowWorker worker(r, row);
+
+            // Get the object type. Column 0 is the entry ID which
+            // we don't need here.
+            std::string object_type = worker.getString(1);
+
+            // Get the object ID.
+            uint64_t object_id = worker.getBigInt(2);
+
+            // Get the modification type.
+            AuditEntry::ModificationType mod_type =
+                static_cast<AuditEntry::ModificationType>(worker.getSmallInt(3));
+
+            // Get the modification time.
+            boost::posix_time::ptime mod_time = worker.getTimestamp(4);
+
+            // Get the revision ID.
+            uint64_t revision_id = worker.getBigInt(5);;
+
+            // Get the revision log message.
+            std::string log_message = worker.getString(6);
+
+            // Create new audit entry and add it to the collection of received
+            // entries.
+            AuditEntryPtr audit_entry =
+                AuditEntry::create(object_type, object_id, mod_type, mod_time,
+                                   revision_id, log_message);
+            audit_entries.insert(audit_entry);
+        });
+    }
+}
+
+uint64_t
+PgSqlConfigBackendImpl::deleteFromTable(const int index,
+                                        const ServerSelector& server_selector,
+                                        const std::string& operation) {
+    // When deleting multiple objects we must not use ANY server.
+    if (server_selector.amAny()) {
+        isc_throw(InvalidOperation, "deleting multiple objects for ANY server is not"
+                                    " supported");
+    }
+
+    PsqlBindArray in_bindings;
+    return (deleteFromTable(index, server_selector, operation, in_bindings));
+}
+
+uint64_t
+PgSqlConfigBackendImpl::deleteFromTable(const int index,
+                                        const db::ServerSelector& server_selector,
+                                        const std::string& operation,
+                                        db::PsqlBindArray& in_bindings) {
+    // For ANY server, we use queries that lack server tag, otherwise
+    // we need to insert the server tag as the first input parameter.
+    if (!server_selector.amAny() && !server_selector.amUnassigned()) {
+        std::string tag = getServerTag(server_selector, operation);
+        in_bindings.insert(tag, 0);
+    }
+
+    return (updateDeleteQuery(index, in_bindings));
+}
+
+uint64_t
+PgSqlConfigBackendImpl::getLastInsertId(const std::string& table, const std::string& column) {
+    PsqlBindArray in_bindings;
+    in_bindings.add(table);
+    in_bindings.add(column);
+    uint64_t last_id = 0;
+    conn_.selectQuery(getStatement(last_insert_id_index_), in_bindings,
+                    [&last_id] (PgSqlResult& r, int row) {
+            // Get the object type. Column 0 is the entry ID which
+            PgSqlExchange::getColumnValue(r, row, 0, last_id);
+        });
+
+    return (last_id);
+}
+
+void
+PgSqlConfigBackendImpl::getGlobalParameters(const int index,
+                                            const PsqlBindArray& in_bindings,
+                                            StampedValueCollection& parameters) {
+    // The following parameters from the dhcp[46]_global_parameter table are
+    // returned per row:
+    // - id
+    // - parameter name
+    // - parameter value
+    // - parameter type
+    // - modification timestamp
+
+    StampedValuePtr last_param;
+
+    StampedValueCollection local_parameters;
+
+    selectQuery(index, in_bindings,
+                [&local_parameters, &last_param](PgSqlResult& r, int row) {
+        // Extract the column values for r[row].
+        // Create a worker for the row.
+        PgSqlResultRowWorker worker(r, row);
+
+        // Get parameter ID.
+        uint64_t id = worker.getBigInt(0);
+
+        // If we're starting or if this is new parameter being processed...
+        if (!last_param || (last_param->getId() != id)) {
+            // Create the parameter instance.
+
+            // Get parameter name.
+            std::string name = worker.getString(1);
+            if (!name.empty()) {
+                // Fetch the value.
+                std::string value = worker.getString(2);
+
+                // Fetch the type.
+                Element::types ptype = static_cast<Element::types>(worker.getSmallInt(3));
+
+                // Create the parameter.
+                last_param = StampedValue::create(name, value, ptype);
+
+                // Set the id.
+                last_param->setId(id);
+
+                // Get and set the modification time.
+                boost::posix_time::ptime mod_time = worker.getTimestamp(4);
+                last_param->setModificationTime(mod_time);
+
+                // server_tag
+                std::string server_tag_str = worker.getString(5);
+                last_param->setServerTag(server_tag_str);
+
+                // If we're fetching parameters for a given server (explicit server
+                // tag is provided), it takes precedence over the same parameter
+                // specified for all servers. Therefore, we check if the given
+                // parameter already exists and belongs to 'all'.
+                ServerTag last_param_server_tag(server_tag_str);
+                auto& index = local_parameters.get<StampedValueNameIndexTag>();
+                auto existing = index.find(name);
+                if (existing != index.end()) {
+                    // This parameter was already fetched. Let's check if we should
+                    // replace it or not.
+                    if (!last_param_server_tag.amAll() && (*existing)->hasAllServerTag()) {
+                        // Replace parameter specified for 'all' with the one associated
+                        // with the particular server tag.
+                        local_parameters.replace(existing, last_param);
+                        return;
+                    }
+
+                }
+
+                // If there is no such parameter yet or the existing parameter
+                // belongs to a different server and the inserted parameter is
+                // not for all servers.
+                if ((existing == index.end()) ||
+                    (!(*existing)->hasServerTag(last_param_server_tag) &&
+                     !last_param_server_tag.amAll())) {
+                    local_parameters.insert(last_param);
+                }
+            }
+        }
+    });
+
+    parameters.insert(local_parameters.begin(), local_parameters.end());
+}
+
+OptionDefinitionPtr
+PgSqlConfigBackendImpl::getOptionDef(const int index,
+                                     const ServerSelector& server_selector,
+                                     const uint16_t code,
+                                     const std::string& space) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                  " (unassigned) is unsupported at the moment");
+    }
+
+    auto tag = getServerTag(server_selector, "fetching option definition");
+
+    OptionDefContainer option_defs;
+    PsqlBindArray in_bindings;
+    in_bindings.add(tag);
+    in_bindings.add(code);
+    in_bindings.add(space);
+
+    getOptionDefs(index, in_bindings, option_defs);
+    return (option_defs.empty() ? OptionDefinitionPtr() : *option_defs.begin());
+}
+
+void
+PgSqlConfigBackendImpl::getAllOptionDefs(const int index,
+                                         const ServerSelector& server_selector,
+                                         OptionDefContainer& option_defs) {
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(tag.get());
+        getOptionDefs(index, in_bindings, option_defs);
+    }
+}
+
+void
+PgSqlConfigBackendImpl::getModifiedOptionDefs(const int index,
+                                              const ServerSelector& server_selector,
+                                              const boost::posix_time::ptime& modification_time,
+                                              OptionDefContainer& option_defs) {
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(tag.get());
+        in_bindings.addTimestamp(modification_time);
+        getOptionDefs(index, in_bindings, option_defs);
+    }
+}
+
+void
+PgSqlConfigBackendImpl::getOptionDefs(const int index,
+                                      const PsqlBindArray& in_bindings,
+                                      OptionDefContainer& option_defs) {
+    uint64_t last_def_id = 0;
+
+    OptionDefContainer local_option_defs;
+
+    // Run select query.
+    selectQuery(index, in_bindings, [this, &local_option_defs, &last_def_id]
+                (PgSqlResult& r, int row) {
+        // Extract the column values for r[row].
+        // Create a worker for the row.
+        PgSqlResultRowWorker worker(r, row);
+
+        // Get pointer to last fetched option definition.
+        OptionDefinitionPtr last_def;
+        if (!local_option_defs.empty()) {
+            last_def = *local_option_defs.rbegin();
+        }
+
+        // Get option def ID.
+        uint64_t id = worker.getBigInt(0);
+
+        // See if the last fetched definition is the one for which we now got
+        // the row of data. If not, it means that we need to create new option
+        // definition.
+        if ((last_def_id == 0) || (last_def_id != id)) {
+            last_def_id = id;
+            last_def = processOptionDefRow(worker, 0);
+
+            // server_tag
+            ServerTag last_def_server_tag(worker.getString(10));
+            last_def->setServerTag(last_def_server_tag.get());
+
+            // If we're fetching option definitions for a given server
+            // (explicit server tag is provided), it takes precedence over
+            // the same option definition specified for all servers.
+            // Therefore, we check if the given option already exists and
+            // belongs to 'all'.
+            auto& index = local_option_defs.get<1>();
+            auto existing_it_pair = index.equal_range(last_def->getCode());
+            auto existing_it = existing_it_pair.first;
+            bool found = false;
+            for ( ; existing_it != existing_it_pair.second; ++existing_it) {
+                if ((*existing_it)->getOptionSpaceName() == last_def->getOptionSpaceName()) {
+                    found = true;
+                    // This option definition was already fetched. Let's check
+                    // if we should replace it or not.
+                    if (!last_def_server_tag.amAll() && (*existing_it)->hasAllServerTag()) {
+                        index.replace(existing_it, last_def);
+                        return;
+                    }
+                    break;
+                }
+            }
+
+            // If there is no such option definition yet or the existing option
+            // definition belongs to a different server and the inserted option
+            // definition is not for all servers.
+            if (!found ||
+                (!(*existing_it)->hasServerTag(last_def_server_tag) &&
+                 !last_def_server_tag.amAll())) {
+                static_cast<void>(local_option_defs.push_back(last_def));
+            }
+        }
+    });
+
+    // Append the option definition fetched by this function into the container
+    // supplied by the caller. The container supplied by the caller may already
+    // hold some option definitions fetched for other server tags.
+    option_defs.insert(option_defs.end(), local_option_defs.begin(),
+                       local_option_defs.end());
+}
+
+void
+PgSqlConfigBackendImpl::createUpdateOptionDef(const db::ServerSelector& server_selector,
+                                              const Option::Universe& universe,
+                                              const OptionDefinitionPtr& option_def,
+                                              const std::string& /* space */,
+                                              const int& /*get_option_def_code_space*/,
+                                              const int& insert_option_def,
+                                              const int& update_option_def,
+                                              const int& create_audit_revision,
+                                              const int& insert_option_def_server,
+                                              const std::string& client_class_name) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                                  " (unassigned) is unsupported at the moment");
+    }
+
+    auto tag = getServerTag(server_selector, "creating or updating option definition");
+
+    // Create input parameter bindings.
+    PsqlBindArray in_bindings;
+    in_bindings.add(option_def->getCode());
+    in_bindings.addTempString(option_def->getName());
+    in_bindings.addTempString(option_def->getOptionSpaceName());
+    in_bindings.add(option_def->getType());
+    in_bindings.addTimestamp(option_def->getModificationTime());
+    in_bindings.add(option_def->getArrayType());
+    in_bindings.addTempString(option_def->getEncapsulatedSpace());
+
+    ElementPtr record_types = Element::createList();
+    for (auto field : option_def->getRecordFields()) {
+        record_types->add(Element::create(static_cast<int>(field)));
+    }
+
+    if (record_types->empty()) {
+        in_bindings.addNull();
+    } else {
+        in_bindings.addTempString(record_types->str());
+    }
+
+    in_bindings.add(option_def->getContext());
+
+    if (client_class_name.empty()) {
+        in_bindings.addNull();
+    } else {
+        in_bindings.add(client_class_name);
+    }
+
+    // Remember the size before we added where clause arguments.
+    size_t pre_where_size = in_bindings.size();
+
+    // Now the add the update where clause parameters
+    in_bindings.add(tag);
+    in_bindings.add(option_def->getCode());
+    in_bindings.addTempString(option_def->getOptionSpaceName());
+
+    // Start transaction.
+    PgSqlTransaction transaction(conn_);
+
+    // Create scoped audit revision. As long as this instance exists
+    // no new audit revisions are created in any subsequent calls.
+    ScopedAuditRevision audit_revision(this,
+                                       create_audit_revision,
+                                       server_selector,
+                                       "option definition set",
+                                       true);
+
+    // Try to update the definition.
+    if (updateDeleteQuery(update_option_def, in_bindings) == 0) {
+        // It doesn't exist, so we'll try to insert it.
+        // Remove the update where clause bindings.
+        while (in_bindings.size() > pre_where_size) {
+            in_bindings.popBack();
+        }
+
+        // Try to insert the definition.
+        insertQuery(insert_option_def, in_bindings);
+
+        // Successfully inserted the definition. Now, we have to associate it
+        // with the server tag.
+        PsqlBindArray attach_bindings;
+        uint64_t id = getLastInsertId((universe == Option::V4 ?
+                                       "dhcp4_option_def" : "dhcp6_option_def"), "id");
+        attach_bindings.add(id);
+        attach_bindings.addTimestamp(option_def->getModificationTime());
+
+        // Insert associations of the option definition with servers.
+        attachElementToServers(insert_option_def_server, server_selector, attach_bindings);
+    }
+
+    // Commit the work.
+    transaction.commit();
+}
+
+OptionDescriptorPtr
+PgSqlConfigBackendImpl::getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const ServerSelector& server_selector,
+                                  const uint16_t code,
+                                  const std::string& space) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                                  " (unassigned) is unsupported at the moment");
+    }
+
+    auto tag = getServerTag(server_selector, "fetching global option");
+
+    OptionContainer options;
+    PsqlBindArray in_bindings;
+    in_bindings.add(tag);
+    in_bindings.add(code);
+    in_bindings.add(space);
+
+    getOptions(index, in_bindings, universe, options);
+    return (options.empty() ? OptionDescriptorPtr() :
+            OptionDescriptor::create(*options.begin()));
+}
+
+OptionContainer
+PgSqlConfigBackendImpl::getAllOptions(const int index,
+                                      const Option::Universe& universe,
+                                      const ServerSelector& server_selector) {
+    OptionContainer options;
+
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        PsqlBindArray in_bindings;
+        in_bindings.addTempString(tag.get());
+        getOptions(index, in_bindings, universe, options);
+    }
+
+    return (options);
+}
+
+OptionContainer
+PgSqlConfigBackendImpl::getModifiedOptions(const int index,
+                                           const Option::Universe& universe,
+                                           const ServerSelector& server_selector,
+                                           const boost::posix_time::ptime& modification_time) {
+    OptionContainer options;
+
+    PsqlBindArray in_bindings;
+    auto const& tags = server_selector.getTags();
+    for (auto const& tag : tags) {
+        in_bindings.addTempString(tag.get());
+        in_bindings.addTimestamp(modification_time);
+        getOptions(index, in_bindings, universe, options);
+    }
+
+    return (options);
+}
+
+OptionDescriptorPtr
+PgSqlConfigBackendImpl::getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const ServerSelector& server_selector,
+                                  const SubnetID& subnet_id,
+                                  const uint16_t code,
+                                  const std::string& space) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                                  " (unassigned) is unsupported at the moment");
+    }
+
+    auto tag = getServerTag(server_selector, "fetching subnet level option");
+
+    PsqlBindArray in_bindings;
+    in_bindings.add(tag);
+    in_bindings.add(subnet_id);
+    in_bindings.add(code);   // Postgresql code is same size regardless of universe
+    in_bindings.add(space);
+
+    OptionContainer options;
+    getOptions(index, in_bindings, universe, options);
+    return (options.empty() ? OptionDescriptorPtr() :
+            OptionDescriptor::create(*options.begin()));
+}
+
+OptionDescriptorPtr
+PgSqlConfigBackendImpl::getOption(const int index,
+                                  const ServerSelector& server_selector,
+                                  const Lease::Type& pool_type,
+                                  const uint64_t pool_id,
+                                  const uint16_t code,
+                                  const std::string& space) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                                  " (unassigned) is unsupported at the moment");
+    }
+
+    std::string msg = "fetching ";
+    if (pool_type == Lease::TYPE_PD) {
+        msg += "prefix delegation";
+    } else {
+        msg += "address";
+    }
+    msg += " pool level option";
+    auto tag = getServerTag(server_selector, msg);
+
+    PsqlBindArray in_bindings;
+    in_bindings.add(tag);
+    in_bindings.add(pool_id);
+    in_bindings.add(code);   // Postgresql code is same size regardless of universe
+    in_bindings.add(space);
+    Option::Universe universe = Option::V4;
+    OptionContainer options;
+    if (pool_type != Lease::TYPE_V4) {
+        universe = Option::V6;
+    }
+    getOptions(index, in_bindings, universe, options);
+    return (options.empty() ? OptionDescriptorPtr() :
+            OptionDescriptor::create(*options.begin()));
+}
+
+OptionDescriptorPtr
+PgSqlConfigBackendImpl::getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const ServerSelector& server_selector,
+                                  const std::string& shared_network_name,
+                                  const uint16_t code,
+                                  const std::string& space) {
+
+    if (server_selector.amUnassigned()) {
+        isc_throw(NotImplemented, "managing configuration for no particular server"
+                                  " (unassigned) is unsupported at the moment");
+    }
+
+    auto tag = getServerTag(server_selector, "fetching shared network level option");
+
+    PsqlBindArray in_bindings;
+    in_bindings.add(tag);
+    in_bindings.add(shared_network_name);
+    in_bindings.add(code);   // Postgresql code is same size regardless of universe
+    in_bindings.add(space);
+
+    OptionContainer options;
+    getOptions(index, in_bindings, universe, options);
+    return (options.empty() ? OptionDescriptorPtr() :
+            OptionDescriptor::create(*options.begin()));
+}
+
+void
+PgSqlConfigBackendImpl::getOptions(const int index,
+                                   const db::PsqlBindArray& in_bindings,
+                                   const Option::Universe& universe,
+                                   OptionContainer& options) {
+    uint64_t last_option_id = 0;
+    OptionContainer local_options;
+    selectQuery(index, in_bindings, [this, universe, &local_options, &last_option_id]
+                (PgSqlResult& r, int row) {
+        // Extract the column values for r[row].
+        // Create a worker for the row.
+        PgSqlResultRowWorker worker(r, row);
+
+        // Get option ID.
+        uint64_t id = worker.getBigInt(0);
+
+        // Parse option.
+        if ((last_option_id == 0) || (last_option_id < id)) {
+            last_option_id = id;
+
+            OptionDescriptorPtr desc = processOptionRow(universe, worker, 0);
+            if (desc) {
+                // server_tag for the global option
+                ServerTag last_option_server_tag(worker.getString(13));
+                desc->setServerTag(last_option_server_tag.get());
+
+                // If we're fetching options for a given server (explicit server
+                // tag is provided), it takes precedence over the same option
+                // specified for all servers. Therefore, we check if the given
+                // option already exists and belongs to 'all'.
+                auto& index = local_options.get<1>();
+                auto existing_it_pair = index.equal_range(desc->option_->getType());
+                auto existing_it = existing_it_pair.first;
+                bool found = false;
+                for ( ; existing_it != existing_it_pair.second; ++existing_it) {
+                    if (existing_it->space_name_ == desc->space_name_) {
+                        found = true;
+                        // This option was already fetched. Let's check if we should
+                        // replace it or not.
+                        if (!last_option_server_tag.amAll() && existing_it->hasAllServerTag()) {
+                            index.replace(existing_it, *desc);
+                            return;
+                        }
+                        break;
+                    }
+                }
+
+                // If there is no such global option yet or the existing option
+                // belongs to a different server and the inserted option is not
+                // for all servers.
+                if (!found ||
+                    (!existing_it->hasServerTag(last_option_server_tag) &&
+                     !last_option_server_tag.amAll())) {
+                    static_cast<void>(local_options.push_back(*desc));
+                }
+            }
+        }
+    });
+
+    // Append the options fetched by this function into the container supplied
+    // by the caller. The container supplied by the caller may already hold
+    // some options fetched for other server tags.
+    options.insert(options.end(), local_options.begin(), local_options.end());
+}
+
+OptionDescriptorPtr
+PgSqlConfigBackendImpl::processOptionRow(const Option::Universe& universe,
+                                         PgSqlResultRowWorker& worker,
+                                         size_t first_col) {
+    // Some of the options have standard or custom definitions.
+    // Depending whether the option has a definition or not a different
+    // C++ class may be used to represent the option. Therefore, the
+    // first thing to do is to see if there is a definition for our
+    // parsed option. The option code and space is needed for it.
+    std::string space = worker.getString(first_col + 4);
+    uint16_t code = worker.getSmallInt(first_col + 1);
+
+    OptionPtr option = Option::create(universe, code);
+
+    // Get formatted value if available.
+    std::string formatted_value;
+    if (!worker.isColumnNull(first_col + 3)) {
+        formatted_value = worker.getString(first_col + 3);
+    }
+
+    // If we don't have a formatted value, check for a blob. Add it to the
+    // option if it exists.
+    if (formatted_value.empty() && !worker.isColumnNull(first_col + 2)) {
+        std::vector<uint8_t> blob;
+        worker.getBytes(first_col + 2, blob);
+        option->setData(blob.begin(), blob.end());
+    }
+
+    // Check if the option is persistent.
+    bool persistent = false;
+    if (!worker.isColumnNull(first_col + 5)) {
+        persistent = worker.getBool(first_col + 5);
+    }
+
+    // Check if the option is cancelled.
+    bool cancelled = false;
+    if (!worker.isColumnNull(first_col + 6)) {
+        cancelled = worker.getBool(first_col + 6);
+    }
+
+    // Create option descriptor which encapsulates our option and adds
+    // additional information, i.e. whether the option is persistent,
+    // its option space and timestamp.
+    OptionDescriptorPtr desc = OptionDescriptor::create(option,
+                                                        persistent,
+                                                        cancelled,
+                                                        formatted_value);
+    desc->space_name_ = space;
+    desc->setModificationTime(worker.getTimestamp(first_col + 12));
+
+    // Set database id for the option.
+    // @todo Can this actually ever be null and if it is, isn't that an error?
+    if (!worker.isColumnNull(first_col)) {
+        desc->setId(worker.getBigInt(first_col));
+    }
+
+    return (desc);
+}
+
+OptionDefinitionPtr
+PgSqlConfigBackendImpl::processOptionDefRow(PgSqlResultRowWorker& worker,
+                                            const size_t first_col) {
+    OptionDefinitionPtr def;
+
+    // Check array type, because depending on this value we have to use
+    // different constructor.
+    std::string name = worker.getString(first_col + 2);
+    uint16_t code = worker.getSmallInt(first_col + 1);
+    std::string space = worker.getString(first_col + 3);
+    OptionDataType type = static_cast<OptionDataType>(worker.getSmallInt(first_col + 4));
+
+    bool array_type = worker.getBool(first_col + 6);
+    if (array_type) {
+        // Create array option.
+        def = OptionDefinition::create(name, code, space, type, true);
+    } else {
+        // Create non-array option.
+        def = OptionDefinition::create(name, code, space, type,
+                                       (worker.isColumnNull(first_col + 7) ? ""
+                                        : worker.getString(first_col + 7).c_str()));
+    }
+
+    // id
+    def->setId(worker.getBigInt(first_col));
+
+    // record_types
+    if (!worker.isColumnNull(first_col + 8)) {
+        ElementPtr record_types_element = worker.getJSON(first_col + 8);
+        if (record_types_element->getType() != Element::list) {
+            isc_throw(BadValue, "invalid record_types value "
+                      << worker.getString(first_col + 8));
+        }
+
+        // This element must contain a list of integers specifying
+        // types of the record fields.
+        for (auto i = 0; i < record_types_element->size(); ++i) {
+            auto type_element = record_types_element->get(i);
+            if (type_element->getType() != Element::integer) {
+                isc_throw(BadValue, "record type values must be integers");
+            }
+
+            def->addRecordField(static_cast<OptionDataType>(type_element->intValue()));
+        }
+    }
+
+    // Update modification time.
+    def->setModificationTime(worker.getTimestamp(first_col + 5));
+
+    return (def);
+}
+
+void
+PgSqlConfigBackendImpl::attachElementToServers(const int index,
+                                               const ServerSelector& server_selector,
+                                               const PsqlBindArray& in_bindings) {
+    // Copy the bindings because we're going to modify them.
+    PsqlBindArray server_bindings = in_bindings;
+    for (auto const& tag : server_selector.getTags()) {
+        // Add the server tag to end of the bindings.
+        std::string server_tag = tag.get();
+        server_bindings.add(server_tag);
+
+        // Insert the server association.
+        // Handles the case where the server does not exists.
+        try {
+            insertQuery(index, server_bindings);
+        } catch (const NullKeyError&) {
+            // The message should give the tag value.
+            isc_throw(NullKeyError,
+                      "server '" << tag.get() << "' does not exist");
+        }
+        // Remove the prior server tag.
+        server_bindings.popBack();
+    }
+}
+
+ServerPtr
+PgSqlConfigBackendImpl::getServer(const int index, const ServerTag& server_tag) {
+    ServerCollection servers;
+
+    // Create input parameter bindings.
+    PsqlBindArray in_bindings;
+    in_bindings.addTempString(server_tag.get());
+
+    getServers(index, in_bindings, servers);
+
+    return (servers.empty() ? ServerPtr() : *servers.begin());
+}
+
+void
+PgSqlConfigBackendImpl::getAllServers(const int index, db::ServerCollection& servers) {
+    PsqlBindArray in_bindings;
+    getServers(index, in_bindings, servers);
+}
+
+void
+PgSqlConfigBackendImpl::getServers(const int index,
+                                   const PsqlBindArray& in_bindings,
+                                   ServerCollection& servers) {
+    // Track the last server added to avoid duplicates. This
+    // assumes the rows are ordered by server ID.
+    ServerPtr last_server;
+    selectQuery(index, in_bindings,
+                [&servers, &last_server](PgSqlResult& r, int row) {
+        // Extract the column values for r[row].
+        // Create a worker for the row.
+        PgSqlResultRowWorker worker(r, row);
+
+        // Get the server ID.
+        uint64_t id = worker.getBigInt(0);
+
+        // Get the server tag.
+        std::string tag = worker.getString(1);
+
+        // Get the description.
+        std::string description = worker.getString(2);
+
+        // Get the modification time.
+        boost::posix_time::ptime mod_time = worker.getTimestamp(3);
+
+        if (!last_server || (last_server->getId() != id)) {
+            // Create the server instance.
+            last_server = Server::create(ServerTag(tag), description);
+
+            // id
+            last_server->setId(id);
+
+            // modification_ts
+            last_server->setModificationTime(mod_time);
+
+            // New server fetched. Let's store it.
+            servers.insert(last_server);
+        }
+    });
+}
+
+void
+PgSqlConfigBackendImpl::createUpdateServer(const int& create_audit_revision,
+                                           const int& create_index,
+                                           const int& update_index,
+                                           const ServerPtr& server) {
+    // The server tag 'all' is reserved.
+    if (server->getServerTag().amAll()) {
+        isc_throw(InvalidOperation,
+                  "'all' is a name reserved for the server tag which"
+                  " associates the configuration elements with all servers connecting"
+                  " to the database and a server with this name may not be created");
+    }
+
+    // Populate the input bindings.
+    PsqlBindArray in_bindings;
+    std::string tag = server->getServerTagAsText();
+    in_bindings.add(tag);
+    in_bindings.addTempString(server->getDescription());
+    in_bindings.addTimestamp(server->getModificationTime());
+
+    // Start transaction.
+    PgSqlTransaction transaction(conn_);
+
+    // Create scoped audit revision. As long as this instance exists
+    // no new audit revisions are created in any subsequent calls.
+    ScopedAuditRevision audit_revision(this, create_audit_revision, ServerSelector::ALL(),
+                                       "server set", true);
+
+    // Create a savepoint in case we are called as part of larger
+    // transaction.
+    conn_.createSavepoint("createUpdateServer");
+
+    try {
+        // Attempt to insert the server.
+        insertQuery(create_index, in_bindings);
+    } catch (const DuplicateEntry&) {
+        // Rollback to the savepoint to preserve an outer
+        // transaction work.
+        conn_.rollbackToSavepoint("createUpdateServer");
+
+        // Add another instance of tag to the bindings to be used
+        // as the where clause parameter. PostgreSQL uses
+        // numbered placeholders so we could use $1 again, but
+        // doing it this way leaves the SQL more generic.
+        in_bindings.add(tag);
+
+        // Attempt to update the server.
+        if (!updateDeleteQuery(update_index, in_bindings)) {
+            // Possible only if someone deleted it since we tried to insert it,
+            // the query is broken, or the bindings are nonsense.
+            isc_throw(Unexpected, "Update server failed to find server tag: " << tag);
+        }
+    }
+
+    // Commit the transaction.
+    transaction.commit();
+}
+
+std::string
+PgSqlConfigBackendImpl::getType() const {
+    return ("postgresql");
+}
+
+std::string
+PgSqlConfigBackendImpl::getHost() const {
+    std::string host = "localhost";
+    try {
+        host = conn_.getParameter("host");
+    } catch (...) {
+        // No host parameter. Return localhost as a default.
+    }
+    return (host);
+}
+
+uint16_t
+PgSqlConfigBackendImpl::getPort() const {
+    try {
+        std::string sport = conn_.getParameter("port");
+        return (boost::lexical_cast<uint16_t>(sport));
+
+    } catch (...) {
+        // No port parameter or parameter invalid.
+    }
+    return (0);
+}
+
+void
+PgSqlConfigBackendImpl::addDdnsReplaceClientNameBinding(PsqlBindArray& bindings,
+                                                        const NetworkPtr& network) {
+    auto ddns_rcn_mode = network->getDdnsReplaceClientNameMode(Network::Inheritance::NONE);
+    if (!ddns_rcn_mode.unspecified()) {
+        bindings.add(static_cast<uint8_t>(ddns_rcn_mode.get()));
+    } else {
+        bindings.addNull();
+    }
+}
+
+void
+PgSqlConfigBackendImpl::addRelayBinding(PsqlBindArray& bindings,
+                                        const NetworkPtr& network) {
+    ElementPtr relay_element = Element::createList();
+    const auto& addresses = network->getRelayAddresses();
+    if (!addresses.empty()) {
+        for (const auto& address : addresses) {
+            relay_element->add(Element::create(address.toText()));
+        }
+    }
+
+    bindings.add(relay_element);
+}
+
+void
+PgSqlConfigBackendImpl::setRelays(PgSqlResultRowWorker& worker, size_t col, Network& network) {
+    if (worker.isColumnNull(col)) {
+        return;
+    }
+
+    ElementPtr relay_element = worker.getJSON(col);
+    if (relay_element->getType() != Element::list) {
+        isc_throw(BadValue, "invalid relay list: " << worker.getString(col));
+    }
+
+    for (auto i = 0; i < relay_element->size(); ++i) {
+        auto relay_address_element = relay_element->get(i);
+        if (relay_address_element->getType() != Element::string) {
+            isc_throw(BadValue, "elements of relay_addresses list must"
+                                "be valid strings");
+        }
+
+        network.addRelayAddress(IOAddress(relay_address_element->stringValue()));
+    }
+}
+
+void
+PgSqlConfigBackendImpl::setRequiredClasses(PgSqlResultRowWorker& worker, size_t col,
+                                           std::function<void(const std::string&)> setter) {
+    if (worker.isColumnNull(col)) {
+        return;
+    }
+
+    ElementPtr require_element = worker.getJSON(col);
+    if (require_element->getType() != Element::list) {
+        std::ostringstream ss;
+        require_element->toJSON(ss);
+        isc_throw(BadValue, "invalid require_client_classes value " << ss.str());
+    }
+
+    for (auto i = 0; i < require_element->size(); ++i) {
+        auto require_item = require_element->get(i);
+        if (require_item->getType() != Element::string) {
+            isc_throw(BadValue, "elements of require_client_classes list must"
+                                "be valid strings");
+        }
+
+        setter(require_item->stringValue());
+    }
+}
+
+void
+PgSqlConfigBackendImpl::addOptionValueBinding(PsqlBindArray& bindings,
+                                              const OptionDescriptorPtr& option) {
+    OptionPtr opt = option->option_;
+    if (option->formatted_value_.empty() && (opt->len() > opt->getHeaderLen())) {
+        OutputBuffer buf(opt->len());
+        opt->pack(buf);
+        const char* buf_ptr = static_cast<const char*>(buf.getData());
+        std::vector<uint8_t> blob(buf_ptr + opt->getHeaderLen(),
+                                  buf_ptr + buf.getLength());
+        bindings.addTempBinary(blob);
+    } else {
+        bindings.addNull();
+    }
+}
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_impl.h b/src/hooks/dhcp/pgsql_cb/pgsql_cb_impl.h
new file mode 100644
index 0000000..68df199
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_impl.h
@@ -0,0 +1,902 @@
+// Copyright (C) 2021-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PGSQL_CONFIG_BACKEND_IMPL_H
+#define PGSQL_CONFIG_BACKEND_IMPL_H
+
+#include <cc/stamped_value.h>
+#include <database/audit_entry.h>
+#include <database/database_connection.h>
+#include <database/server.h>
+#include <database/server_collection.h>
+#include <database/server_selector.h>
+#include <dhcp/option.h>
+#include <dhcp/option_definition.h>
+#include <dhcpsrv/cfg_option.h>
+#include <dhcpsrv/lease.h>
+#include <dhcpsrv/network.h>
+#include <dhcpsrv/subnet_id.h>
+#include <exceptions/exceptions.h>
+#include <pgsql/pgsql_connection.h>
+#include <pgsql/pgsql_exchange.h>
+
+#include <set>
+#include <sstream>
+#include <string>
+#include <vector>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Base class for PostgreSQL Config Backend implementations.
+///
+/// This class contains common methods for manipulating data in the
+/// PostgreSQL database, used by all servers.
+///
+/// All POSIX times specified in the methods belonging to this
+/// class must be local times.
+class PgSqlConfigBackendImpl {
+protected:
+
+    /// @brief RAII object used to protect against creating multiple
+    /// audit revisions during cascade configuration updates.
+    ///
+    /// Audit revision is created per a single database transaction.
+    /// It includes log message associated with the configuration
+    /// change. Single command sent over the control API should
+    /// result in a single audit revision entry in the database.
+    /// A single configuration update often consists of multiple
+    /// insertions, updates and/or deletes in the database. For
+    /// example, a subnet contains pools and DHCP options which are
+    /// inserted to their respective tables. We refer to such update
+    /// as a cascade update. Cascade update should result in a single
+    /// audit revision and an audit entry for a subnet, rather than
+    /// multiple audit revisions and audit entries for the subnet,
+    /// pools and child DHCP options.
+    ///
+    /// Creating an instance of the @c ScopedAuditRevision guards
+    /// against creation of multiple audit revisions when child
+    /// objects are inserted or updated in the database. When the
+    /// instance of this object goes out of scope the new audit
+    /// revisions can be created. The caller must ensure that
+    /// the instance of this object exists throughout the whole
+    /// transaction with the database.
+    class ScopedAuditRevision {
+    public:
+
+        /// @brief Constructor.
+        ///
+        /// Creates new audit revision and sets the flag in the
+        /// PostgreSQL CB implementation object which prevents new audit
+        /// revisions to be created while this instance exists.
+        ///
+        /// @param impl pointer to the PostgreSQL CB implementation.
+        /// @param index index of the query to set session variables
+        /// used for creation of the audit revision and the audit
+        /// entries.
+        /// @param server_selector Server selector.
+        /// @param log_message log message associated with the audit
+        /// revision to be inserted into the database.
+        /// @param cascade_transaction boolean flag indicating if
+        /// we're performing cascade transaction. If set to true,
+        /// the audit entries for the child objects (e.g. DHCP
+        /// options) won't be created.
+        ScopedAuditRevision(PgSqlConfigBackendImpl* impl,
+                            const int index,
+                            const db::ServerSelector& server_selector,
+                            const std::string& log_message,
+                            bool cascade_transaction);
+
+        /// @brief Destructor.
+        ///
+        /// Clears the flag which is blocking creation of the new
+        /// audit revisions.
+        ~ScopedAuditRevision();
+
+    private:
+
+        /// @brief Pointer to the PostgreSQL CB implementation.
+        PgSqlConfigBackendImpl* impl_;
+    };
+
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    /// @param db_reconnect_callback The connection recovery callback.
+    /// @param last_insert_id_index statement index of the SQL statement to
+    /// use when fetching the last insert id for a given table.
+    explicit PgSqlConfigBackendImpl(const db::DatabaseConnection::ParameterMap& parameters,
+                                    const db::DbCallback db_reconnect_callback,
+                                    const size_t last_insert_id_index);
+
+    /// @brief Destructor.
+    virtual ~PgSqlConfigBackendImpl();
+
+    /// @brief Returns server tag associated with the particular selector.
+    ///
+    /// This method expects that there is exactly one server tag associated with
+    /// the server selector.
+    ///
+    /// @param server_selector Server selector.
+    /// @param operation Operation which results in calling this function. This is
+    /// used for error reporting purposes.
+    /// @return Server tag.
+    /// @throw InvalidOperation if the server selector is unassigned or if there
+    /// is more than one server tag associated with the selector.
+    std::string getServerTag(const db::ServerSelector& server_selector,
+                             const std::string& operation) const {
+        auto const& tags = server_selector.getTags();
+        if (tags.size() != 1) {
+            isc_throw(InvalidOperation, "expected exactly one server tag to be specified"
+                      " while " << operation << ". Got: "
+                      << getServerTagsAsText(server_selector));
+        }
+
+        return (tags.begin()->get());
+    }
+
+    /// @brief Returns server tags associated with the particular selector
+    /// as text.
+    ///
+    /// This method is useful for logging purposes.
+    std::string getServerTagsAsText(const db::ServerSelector& server_selector) const {
+        std::ostringstream s;
+        auto const& server_tags = server_selector.getTags();
+        for (auto const& tag : server_tags) {
+            if (s.tellp() != 0) {
+                s << ", ";
+            }
+            s << tag.get();
+        }
+
+        return (s.str());
+    }
+
+    /// @brief Invokes the corresponding stored procedure in PgSQL.
+    ///
+    /// The @c createAuditRevision stored procedure creates new audit
+    /// revision and initializes several session variables to be used when
+    /// the audit entries will be created for the inserted, updated or
+    /// deleted configuration elements.
+    ///
+    /// @param index query index.
+    /// @param server_selector Server selector.
+    /// @param audit_ts Timestamp to be associated with the audit
+    /// revision.
+    /// @param log_message log message to be used for the audit revision.
+    /// @param cascade_transaction Boolean value indicating whether the
+    /// configuration modification is performed as part of the owning
+    /// element modification, e.g. subnet is modified resulting in
+    /// modification of the DHCP options it owns. In that case only the
+    /// audit entry for the owning element should be created.
+    void createAuditRevision(const int index,
+                             const db::ServerSelector& server_selector,
+                             const boost::posix_time::ptime& audit_ts,
+                             const std::string& log_message,
+                             const bool cascade_transaction);
+
+    /// @brief Clears the flag blocking creation of the new audit revisions.
+    ///
+    /// This is used by the @c ScopedAuditRevision object.
+    void clearAuditRevision();
+
+    /// @brief Sends query to the database to retrieve most recent audit entries.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param modification_time Timestamp being a lower limit for the returned
+    /// result set, i.e. entries later than specified time are returned.
+    /// @param modification_id Identifier being a lower limit for the returned
+    /// result set, used when two (or more) revisions have the same
+    /// modification_time.
+    /// @param [out] audit_entries Reference to the container where fetched audit
+    /// entries will be inserted.
+    void getRecentAuditEntries(const int index,
+                               const db::ServerSelector& server_selector,
+                               const boost::posix_time::ptime& modification_time,
+                               const uint64_t& modification_id,
+                               db::AuditEntryCollection& audit_entries);
+
+    /// @brief Sends query to delete rows from a table.
+    ///
+    /// @param index Index of the statement to be executed.
+    /// @param server_selector Server selector.
+    /// @param operation Operation which results in calling this function. This is
+    /// used for error reporting purposes.
+    /// @return Number of deleted rows.
+    uint64_t deleteFromTable(const int index,
+                             const db::ServerSelector& server_selector,
+                             const std::string& operation);
+
+    /// @brief Sends query to delete rows from a table.
+    ///
+    /// @param index Index of the statement to be executed.
+    /// @param server_selector Server selector.
+    /// @param operation Operation which results in calling this function. This is
+    /// used for logging purposes.
+    /// @param in_bindings Reference to the PgSQL input bindings. They are modified
+    /// as a result of this function - server tag is inserted into the beginning
+    /// of the bindings collection.
+    /// @return Number of deleted rows.
+    uint64_t deleteFromTable(const int index,
+                             const db::ServerSelector& server_selector,
+                             const std::string& operation,
+                             db::PsqlBindArray& bindings);
+
+    /// @brief Sends query to delete rows from a table.
+    ///
+    /// @tparam KeyType Type of the key used as the second binding. The
+    /// server tag is used as first binding.
+    ///
+    /// @param index Index of the statement to be executed.
+    /// @param server_selector Server selector.
+    /// @param operation Operation which results in calling this function. This is
+    /// used for error reporting purposes.
+    /// @param key Value to be used as input binding to the delete
+    /// statement. The default value is empty which indicates that the
+    /// key should not be used in the query.
+    /// @return Number of deleted rows.
+    /// @throw InvalidOperation if the server selector is unassigned or
+    /// if there are more than one server tags associated with the
+    /// server selector.
+    template<typename KeyType>
+    uint64_t deleteFromTable(const int index,
+                             const db::ServerSelector& server_selector,
+                             const std::string& operation,
+                             KeyType key) {
+        // When deleting by some key, we must use ANY.
+        if (server_selector.amUnassigned()) {
+            isc_throw(NotImplemented, "deleting an unassigned object requires "
+                      "an explicit server tag or using ANY server. The UNASSIGNED "
+                      "server selector is currently not supported");
+        }
+
+        db::PsqlBindArray in_bindings;
+        in_bindings.add(key);
+        return (deleteFromTable(index, server_selector, operation, in_bindings));
+    }
+
+    /// @brief Returns the last sequence value for the given table and
+    /// column name.
+    ///
+    /// This relies on PostgreSQL's currval() function which will return
+    /// the last value generated for the sequence within the current session.
+    ///
+    /// @param table name of the table
+    /// @param column name of the sequence column
+    /// @return returns the most recently modified value for the given
+    /// sequence
+    uint64_t getLastInsertId(const std::string& table, const std::string& column);
+
+    /// @brief Sends query to retrieve multiple global parameters.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] parameters Reference to the container where fetched parameters
+    /// will be inserted.
+    void getGlobalParameters(const int index,
+                             const db::PsqlBindArray& in_bindings,
+                             data::StampedValueCollection& parameters);
+
+    /// @brief Sends query to retrieve single option definition by code and
+    /// option space.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param code Option code.
+    /// @param space Option space name.
+    ///
+    /// @return Pointer to the returned option definition or NULL if such
+    /// option definition doesn't exist.
+    OptionDefinitionPtr getOptionDef(const int index,
+                                     const db::ServerSelector& server_selector,
+                                     const uint16_t code,
+                                     const std::string& space);
+
+    /// @brief Sends query to retrieve all option definitions.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param [out] option_defs Reference to the container where option
+    /// definitions are to be stored.
+    void getAllOptionDefs(const int index,
+                          const db::ServerSelector& server_selector,
+                          OptionDefContainer& option_defs);
+
+    /// @brief Sends query to retrieve option definitions with modification
+    /// time later than specified timestamp.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param modification_time Lower bound subnet modification time.
+    /// @param [out] option_defs Reference to the container where option
+    /// definitions are to be stored.
+    void getModifiedOptionDefs(const int index,
+                               const db::ServerSelector& server_selector,
+                               const boost::posix_time::ptime& modification_time,
+                               OptionDefContainer& option_defs);
+
+    /// @brief Sends query to the database to retrieve multiple option
+    /// definitions.
+    ///
+    /// Query should order option definitions by id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param [out] option_defs Reference to the container where fetched
+    /// option definitions will be inserted.
+    void getOptionDefs(const int index,
+                       const db::PsqlBindArray& in_bindings,
+                       OptionDefContainer& option_defs);
+
+    /// @brief Creates or updates an option definition.
+    ///
+    /// @param server_selector Server selector.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param option_def Option definition to be added or updated.
+    /// @param space Default option space
+    /// @param get_option_def_code_space Statement getting option
+    /// definition by code and space.
+    /// @param insert_option_def Statement inserting option definition.
+    /// @param update_option_def Statement updating option definition.
+    /// @param create_audit_revision Statement creating audit revision.
+    /// @param insert_option_def_server Statement associating option
+    /// definition with a server.
+    /// @param client_class_name Optional client class name to which
+    /// the option definition belongs. If this value is not specified,
+    /// it is a global option definition.
+    /// @throw NotImplemented if server selector is "unassigned".
+    void createUpdateOptionDef(const db::ServerSelector& server_selector,
+                               const Option::Universe& universe,
+                               const OptionDefinitionPtr& option_def,
+                               const std::string& space,
+                               const int& get_option_def_code_space,
+                               const int& insert_option_def,
+                               const int& update_option_def,
+                               const int& create_audit_revision,
+                               const int& insert_option_def_server,
+                               const std::string& client_class_name = "");
+
+    /// @brief Sends query to retrieve single global option by code and
+    /// option space.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param server_selector Server selector.
+    /// @param code Option code.
+    /// @param space Option space name.
+    ///
+    /// @return Pointer to the returned option or NULL if such option
+    /// doesn't exist.
+    OptionDescriptorPtr getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const db::ServerSelector& server_selector,
+                                  const uint16_t code,
+                                  const std::string& space);
+
+    /// @brief Sends query to retrieve all global options.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param server_selector Server selector.
+    /// @return Container holding returned options.
+    OptionContainer getAllOptions(const int index,
+                                  const Option::Universe& universe,
+                                  const db::ServerSelector& server_selector);
+
+    /// @brief Sends query to retrieve global options with modification
+    /// time later than specified timestamp.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param server_selector Server selector.
+    /// @return Container holding returned options.
+    OptionContainer getModifiedOptions(const int index,
+                                       const Option::Universe& universe,
+                                       const db::ServerSelector& server_selector,
+                                       const boost::posix_time::ptime& modification_time);
+
+    /// @brief Sends query to retrieve single option by code and option space
+    /// for a given subnet id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param server_selector Server selector.
+    /// @param subnet_id Subnet identifier.
+    /// @param code Option code.
+    /// @param space Option space name.
+    ///
+    /// @return Pointer to the returned option descriptor or NULL if such
+    /// option doesn't exist.
+    OptionDescriptorPtr getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const db::ServerSelector& server_selector,
+                                  const dhcp::SubnetID& subnet_id,
+                                  const uint16_t code,
+                                  const std::string& space);
+
+    /// @brief Sends query to retrieve single option by code and option space
+    /// for a given address or prefix delegation (v6) pool id.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_selector Server selector.
+    /// @param pool_type Pool type (Lease::TYPE_V4, TYPE_NA or TYPE_PD).
+    /// @param pool_id Pool identifier in the database.
+    /// @param code Option code.
+    /// @param space Option space name.
+    ///
+    /// @return Pointer to the returned option descriptor or NULL if such
+    /// option doesn't exist.
+    OptionDescriptorPtr getOption(const int index,
+                                  const db::ServerSelector& server_selector,
+                                  const dhcp::Lease::Type& pool_type,
+                                  const uint64_t pool_id,
+                                  const uint16_t code,
+                                  const std::string& space);
+
+    /// @brief Sends query to retrieve single option by code and option space
+    /// for a given shared network.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param server_selector Server selector.
+    /// @param shared_network_name Shared network name.
+    /// @param code Option code.
+    /// @param space Option space name.
+    ///
+    /// @return Pointer to the returned option descriptor or NULL if such
+    /// option doesn't exist.
+    OptionDescriptorPtr getOption(const int index,
+                                  const Option::Universe& universe,
+                                  const db::ServerSelector& server_selector,
+                                  const std::string& shared_network_name,
+                                  const uint16_t code,
+                                  const std::string& space);
+
+    /// @brief Sends query to the database to retrieve multiple options.
+    ///
+    /// Query should order by option_id.
+    ///
+    /// @note The universe is reused to switch between DHCPv4 and DHCPv6
+    /// option layouts.
+    /// @param family Address family (either AF_INET or AF_INET6).
+    /// @param index Index of the query to be used.
+    /// @param in_bindings Input bindings specifying selection criteria. The
+    /// size of the bindings collection must match the number of placeholders
+    /// in the prepared statement. The input bindings collection must be empty
+    /// if the query contains no WHERE clause.
+    /// @param universe Option universe, i.e. V4 or V6.
+    /// @param [out] options Reference to the container where fetched options
+    /// will be inserted.
+    void getOptions(const int index,
+                    const db::PsqlBindArray& in_bindings,
+                    const Option::Universe& universe,
+                    OptionContainer& options);
+
+    /// @brief Returns DHCP option instance from a set of columns within a
+    /// result set row.
+    ///
+    /// The following is the expected order of columns specified in the SELECT
+    /// query:
+    /// - option_id,
+    /// - code,
+    /// - value,
+    /// - formatted_value,
+    /// - space,
+    /// - persistent,
+    /// - cancelled,
+    /// - dhcp4_subnet_id/dhcp6_subnet_id,
+    /// - scope_id,
+    /// - user_context,
+    /// - shared_network_name,
+    /// - pool_id,
+    /// - [pd_pool_id,]
+    /// - modification_ts
+    ///
+    /// @note The universe is reused to switch between DHCPv4 and DHCPv6
+    /// option layouts.
+    /// @param universe V4 or V6.
+    /// @param worker result set row worker containing the row data
+    /// @param first_col column index of the first column (i.e. option_id)
+    /// in the row.
+    OptionDescriptorPtr processOptionRow(const Option::Universe& universe,
+                                         db::PgSqlResultRowWorker& worker,
+                                         const size_t first_col);
+
+    /// @brief Returns DHCP option definition instance from output bindings.
+    ///
+    /// The following is the expected order of columns specified in the SELECT
+    /// query:
+    /// - id,
+    /// - code,
+    /// - name,
+    /// - space,
+    /// - type,
+    /// - modification_ts,
+    /// - is_array,
+    /// - encapsulate,
+    /// - record_types,
+    /// - user_context
+    ///
+    /// @param worker result set row worker containing the row data
+    /// @param first_col column index of the first column (i.e. definition id)
+    /// in the row.
+    /// @return Pointer to the option definition.
+    OptionDefinitionPtr processOptionDefRow(db::PgSqlResultRowWorker& worker,
+                                            const size_t first_col);
+
+    /// @brief Associates a configuration element with multiple servers.
+    ///
+    /// @param index Query index.
+    /// @param server_selector Server selector, perhaps with multiple server tags.
+    /// @param in_bindings Parameter pack holding bindings for the query. The first
+    /// entry must be the primary key of the element to attach. Note that
+    /// the server tag (or server id) must be the last binding in the prepared
+    /// statement. The caller must not include this binding in the parameter pack.
+    void attachElementToServers(const int index,
+                                const db::ServerSelector& server_selector,
+                                const db::PsqlBindArray& in_bindings);
+
+    /// @brief Adds network ddns-replace-client-name mode to a bind array.
+    ///
+    /// If network's value of ddns-replace-client-name mode has been specified
+    /// it is added to the binding, otherwise a null is added to the binding.
+    ///
+    /// @param bindings PsqlBindArray to which the mode should be added.
+    /// @param network Pointer to shared network or subnet for which mode binding
+    /// should be created.
+    void addDdnsReplaceClientNameBinding(db::PsqlBindArray& bindings,
+                                         const NetworkPtr& network);
+
+    /// @brief Adds network relays addresses to a bind array.
+    ///
+    /// Creates an Element tree of relay addresses add adds that to the end
+    /// of the given bind array.
+    ///
+    /// @param bindings PsqlBindArray to which the relay addresses should be added.
+    /// @param network Pointer to a shared network or subnet for which binding
+    /// should be created.
+    void addRelayBinding(db::PsqlBindArray& bindings, const NetworkPtr& network);
+
+    /// @brief Iterates over the relay addresses in a JSON list element at a
+    /// given column, adding each to the given Network's relay list.
+    ///
+    /// Has no effect if the column is null or is an empty list.
+    ///
+    /// @param worker result set row worker containing the row data
+    /// @param col column index of JSON element column
+    /// @param network network to update.
+    ///
+    /// @throw BadValue if the Element is not a list or if any of the
+    /// list's elements are not valid IP addresses in string form.
+    void setRelays(db::PgSqlResultRowWorker& r, size_t col, Network& network);
+
+    /// @brief Adds 'require_client_classes' parameter to a bind array.
+    ///
+    /// Creates an Element tree of required class names and adds that to the end
+    /// of the given bind array.
+    ///
+    /// @tparam T of pointer to objects with getRequiredClasses
+    /// method, e.g. shared network, subnet, pool or prefix delegation pool.
+    /// @param bindings PsqlBindArray to which the classes should be added.
+    /// @param object Pointer to an object with getRequiredClasses method
+    /// @return Pointer to the binding (possibly null binding if there are no
+    /// required classes specified).
+    template<typename T>
+    void addRequiredClassesBinding(db::PsqlBindArray& bindings, const T& object) {
+        // Create JSON list of required classes.
+        data::ElementPtr required_classes_element = data::Element::createList();
+        const auto& required_classes = object->getRequiredClasses();
+        for (auto required_class = required_classes.cbegin();
+             required_class != required_classes.cend();
+             ++required_class) {
+            required_classes_element->add(data::Element::create(*required_class));
+        }
+
+        bindings.add(required_classes_element);
+    }
+
+    /// @brief Iterates over the class names in a JSON list element at a
+    /// given column, invoking a setter function for each one.
+    ///
+    /// Has no effect if the column is null or is an empty list.
+    ///
+    /// @param worker result set row worker containing the row data
+    /// @param col column index of JSON element column
+    /// @param setter function to invoke for each class name in the list
+    ///
+    /// @throw BadValue if the Element is not a list or if any of the
+    /// list's elements are not strings.
+    void setRequiredClasses(db::PgSqlResultRowWorker& worker, size_t col,
+                            std::function<void(const std::string&)> setter);
+
+    /// @brief Adds an option value to a bind array.
+    ///
+    /// @param bindings PsqlBindArray to which the option value should be added.
+    /// @param option Option descriptor holding the option who's value should
+    /// added.
+    void addOptionValueBinding(db::PsqlBindArray& bindings,
+                               const OptionDescriptorPtr& option);
+
+    /// @brief Retrieves a server.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param server_tag Server tag of the server to be retrieved.
+    /// @return Pointer to the @c Server object representing the server or
+    /// null if such server doesn't exist.
+    db::ServerPtr getServer(const int index, const data::ServerTag& server_tag);
+
+    /// @brief Retrieves all servers.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param [out] servers Reference to the container where fetched servers
+    /// will be inserted.
+    void getAllServers(const int index, db::ServerCollection& servers);
+
+    /// @brief Sends query to retrieve servers.
+    ///
+    /// @param index Index of the query to be used.
+    /// @param bindings Reference to the PgSQL input bindings.
+    /// @param [out] servers Reference to the container where fetched servers
+    /// will be inserted.
+    void getServers(const int index,
+                    const db::PsqlBindArray& bindings,
+                    db::ServerCollection& servers);
+
+    /// @brief Creates or updates a server.
+    ///
+    /// This method attempts to insert a new server into the database using
+    /// the query identified by @c create_index. If the insertion fails because
+    /// the server with the given tag already exists in the database, the
+    /// existing server is updated using the query identified by the
+    /// @c update_index.
+    ///
+    /// @param create_audit_revision Index of the query inserting audit
+    /// revision.
+    /// @param create_index Index of the INSERT query to be used.
+    /// @param update_index Index of the UPDATE query to be used.
+    /// @param server Pointer to the server to be inserted or updated.
+    /// @throw InvalidOperation when trying to create a duplicate or
+    /// update the logical server 'all'.
+    void createUpdateServer(const int& create_audit_revision,
+                            const int& create_index,
+                            const int& update_index,
+                            const db::ServerPtr& server);
+
+    /// @brief Executes multiple update and/or delete queries with no input
+    /// bindings.
+    ///
+    /// This is a convenience function which takes multiple query indexes as
+    /// arguments and for each index executes an update or delete query.
+    /// One of the applications of this function is to remove dangling
+    /// configuration elements after the server associated with these elements
+    /// have been deleted.
+    ///
+    /// @tparam T type of the indexes, e.g. @c PgSqlConfigBackendDHCPv4Impl::StatementIndex.
+    /// @tparam R parameter pack holding indexes of type @c T.
+    /// @param first_index first index.
+    /// @param other_indexes remaining indexes.
+    template<typename T, typename... R>
+    void multipleUpdateDeleteQueries(T first_index, R... other_indexes) {
+        std::vector<T> indexes({ first_index, other_indexes... });
+        db::PsqlBindArray in_bindings;
+        for (auto index : indexes) {
+            updateDeleteQuery(index, in_bindings);
+        }
+    }
+
+    /// @brief Removes configuration elements from the index which don't match
+    /// the specified server selector.
+    ///
+    /// This is a generic function which removes configuration elements which
+    /// don't match the specified selector. In order to fetch all server tags
+    /// for the returned configuration element, the query must not limit the
+    /// results to the given server tag. Instead, it must post process the
+    /// result to eliminate those configuration elements for which the desired
+    /// server tag wasn't found.
+    ///
+    /// If the server selector is set to ANY, this method is no-op.
+    ///
+    /// @tparam CollectionIndex Type of the collection to be processed.
+    /// @param server_selector Server selector.
+    /// @param index Reference to the index holding the returned configuration
+    /// elements to be processed.
+    template<typename CollectionIndex>
+    void tossNonMatchingElements(const db::ServerSelector& server_selector,
+                                 CollectionIndex& index) {
+        // Don't filter the matching server tags if the server selector is
+        // set to ANY.
+        if (server_selector.amAny()) {
+            return;
+        }
+
+        // Go over the collection of elements.
+        for (auto elem = index.begin(); elem != index.end();) {
+
+            // If we're asking for shared networks matching all servers,
+            // we have to make sure that the fetched element has "all"
+            // server tag.
+            if (server_selector.amAll()) {
+                if (!(*elem)->hasAllServerTag()) {
+                    // It doesn't so let's remove it.
+                    elem = index.erase(elem);
+                    continue;
+                }
+
+            } else if (server_selector.amUnassigned()) {
+                // Returned element has server tags but we expect that the
+                // elements are unassigned.
+                if (!(*elem)->getServerTags().empty()) {
+                    elem = index.erase(elem);
+                    continue;
+                }
+
+            } else {
+                // Server selector contains explicit server tags, so
+                // let's see if the returned elements includes any of
+                // them.
+                auto const& tags = server_selector.getTags();
+                bool tag_found = false;
+                for (auto const& tag : tags) {
+                    if ((*elem)->hasServerTag(tag) ||
+                        (*elem)->hasAllServerTag()) {
+                        tag_found = true;
+                        break;
+                    }
+                }
+                if (!tag_found) {
+                    // Tag not matching, so toss the element.
+                    elem = index.erase(elem);
+                    continue;
+                }
+            }
+
+            // Go to the next element if we didn't toss the current one.
+            // Otherwise, the erase() function should have already taken
+            // us to the next one.
+            ++elem;
+        }
+    }
+
+    /// @brief Returns backend type in the textual format.
+    ///
+    /// @return "postgresql".
+    std::string getType() const;
+
+    /// @brief Returns backend host.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return host on which the database is located.
+    std::string getHost() const;
+
+    /// @brief Returns backend port number.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return Port number on which database service is available.
+    uint16_t getPort() const;
+
+    /// @brief Return backend parameters
+    ///
+    /// Returns the backend parameters
+    ///
+    /// @return Parameters of the backend.
+    const isc::db::DatabaseConnection::ParameterMap& getParameters() {
+        return (parameters_);
+    }
+
+    /// @brief Sets IO service to be used by the PostgreSQL config backend.
+    ///
+    /// @param IOService object, used for all ASIO operations.
+    static void setIOService(const isc::asiolink::IOServicePtr& io_service) {
+        io_service_ = io_service;
+    }
+
+    /// @brief Returns pointer to the IO service.
+    static isc::asiolink::IOServicePtr& getIOService() {
+        return (io_service_);
+    }
+
+    /// @brief Fetches the SQL statement for a given statement index.
+    ///
+    /// Derivations must override the implementation. The reference
+    /// returned should be non-volatile over the entire lifetime
+    /// of the derivation instance.
+    ///
+    /// @param index index of the desired statement.
+    /// @throw NotImplemented, always
+    virtual db::PgSqlTaggedStatement& getStatement(size_t index) const;
+
+    /// @brief Executes SELECT using the prepared statement specified
+    /// by the given index.
+    ///
+    /// The @c index must refer to an existing prepared statement
+    /// associated with the connection. The @c in_bindings size must match
+    /// the number of placeholders in the prepared statement.
+    ///
+    /// This method executes prepared statement using provided input bindings and
+    /// calls @c process_result_row function for each returned row. The
+    /// @c process_result function is implemented by the caller and should
+    /// gather and store each returned row in an external data structure prior.
+    ///
+    /// @param statement reference to the precompiled tagged statement to execute
+    /// @param in_bindings input bindings holding values to substitue placeholders
+    /// in the query.
+    /// @param process_result_row Pointer to the function to be invoked for each
+    /// retrieved row. This function consumes the retrieved data from the
+    /// result set.
+    void selectQuery(size_t index, const db::PsqlBindArray& in_bindings,
+                     db::PgSqlConnection::ConsumeResultRowFun process_result_row);
+
+    /// @brief Executes INSERT using the prepared statement specified
+    /// by the given index.
+    ///
+    /// The @c index must refer to an existing prepared statement
+    /// associated with the connection. The @c in_bindings size must match
+    /// the number of placeholders in the prepared statement.
+    ///
+    /// This method executes prepared statement using provided bindings to
+    /// insert data into the database.
+    ///
+    /// @param statement reference to the precompiled tagged statement to execute
+    /// @param in_bindings input bindings holding values to substitue placeholders
+    /// in the query.
+    void insertQuery(size_t index, const db::PsqlBindArray& in_bindings);
+
+    /// @brief Executes UPDATE or DELETE using the prepared statement
+    /// specified by the given index, and returns the number of affected rows.
+    ///
+    /// The @c index must refer to an existing prepared statement
+    /// associated with the connection. The @c in_bindings size must match
+    /// the number of placeholders in the prepared statement.
+    ///
+    /// @param statement reference to the precompiled tagged statement to execute
+    /// @param in_bindings Input bindings holding values to substitute placeholders
+    /// in the query.
+    ///
+    /// @return Number of affected rows.
+    uint64_t updateDeleteQuery(size_t index, const db::PsqlBindArray& in_bindings);
+
+    /// @brief Represents connection to the PostgreSQL database.
+    db::PgSqlConnection conn_;
+
+protected:
+
+    /// @brief Timer name used to register database reconnect timer.
+    std::string timer_name_;
+
+private:
+
+    /// @brief Reference counter for @ScopedAuditRevision instances.
+    int audit_revision_ref_count_;
+
+    /// @brief Connection parameters
+    isc::db::DatabaseConnection::ParameterMap parameters_;
+
+    /// @brief The IOService object, used for all ASIO operations.
+    static isc::asiolink::IOServicePtr io_service_;
+
+    /// @brief Statement index of the SQL statement to use for fetching
+    /// last inserted id in a given table.
+    size_t last_insert_id_index_;
+};
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
+
+#endif
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_log.cc b/src/hooks/dhcp/pgsql_cb/pgsql_cb_log.cc
new file mode 100644
index 0000000..64522d9
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_log.cc
@@ -0,0 +1,17 @@
+// Copyright (C) 2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <pgsql_cb_log.h>
+
+namespace isc {
+namespace dhcp {
+
+isc::log::Logger pgsql_cb_logger("pgsql-cb-hooks");
+
+}  // namespace dhcp
+}  // namespace isc
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_log.h b/src/hooks/dhcp/pgsql_cb/pgsql_cb_log.h
new file mode 100644
index 0000000..6331177
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_log.h
@@ -0,0 +1,22 @@
+// Copyright (C) 2021-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef LEASE_CMD_LOG_H
+#define LEASE_CMD_LOG_H
+
+#include <log/logger_support.h>
+#include <log/macros.h>
+#include <pgsql_cb_messages.h>
+
+namespace isc {
+namespace dhcp {
+
+extern isc::log::Logger pgsql_cb_logger;
+
+}  // namespace dhcp
+}  // namespace isc
+
+#endif
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.cc b/src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.cc
new file mode 100644
index 0000000..2baed5c
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.cc
@@ -0,0 +1,405 @@
+// File created from ../../../../src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.mes
+
+#include <cstddef>
+#include <log/message_types.h>
+#include <log/message_initializer.h>
+
+namespace isc {
+namespace cb {
+
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4 = "PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6 = "PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6 = "PGSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4 = "PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6 = "PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS4 = "PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS4";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS6 = "PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS6";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4 = "PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6 = "PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_OPTION4 = "PGSQL_CB_CREATE_UPDATE_OPTION4";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_OPTION6 = "PGSQL_CB_CREATE_UPDATE_OPTION6";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_OPTION_DEF4 = "PGSQL_CB_CREATE_UPDATE_OPTION_DEF4";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_OPTION_DEF6 = "PGSQL_CB_CREATE_UPDATE_OPTION_DEF6";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SERVER4 = "PGSQL_CB_CREATE_UPDATE_SERVER4";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SERVER6 = "PGSQL_CB_CREATE_UPDATE_SERVER6";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK4 = "PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK4";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK6 = "PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK6";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4 = "PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6 = "PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SUBNET4 = "PGSQL_CB_CREATE_UPDATE_SUBNET4";
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SUBNET6 = "PGSQL_CB_CREATE_UPDATE_SUBNET6";
+extern const isc::log::MessageID PGSQL_CB_DEINIT_OK = "PGSQL_CB_DEINIT_OK";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4 = "PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT = "PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6 = "PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT = "PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4 = "PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT = "PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6 = "PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT = "PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_OPTION_DEFS4 = "PGSQL_CB_DELETE_ALL_OPTION_DEFS4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT = "PGSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_OPTION_DEFS6 = "PGSQL_CB_DELETE_ALL_OPTION_DEFS6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT = "PGSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SERVERS4 = "PGSQL_CB_DELETE_ALL_SERVERS4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SERVERS4_RESULT = "PGSQL_CB_DELETE_ALL_SERVERS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SERVERS6 = "PGSQL_CB_DELETE_ALL_SERVERS6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SERVERS6_RESULT = "PGSQL_CB_DELETE_ALL_SERVERS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4 = "PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT = "PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6 = "PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT = "PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SUBNETS4 = "PGSQL_CB_DELETE_ALL_SUBNETS4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SUBNETS4_RESULT = "PGSQL_CB_DELETE_ALL_SUBNETS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SUBNETS6 = "PGSQL_CB_DELETE_ALL_SUBNETS6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SUBNETS6_RESULT = "PGSQL_CB_DELETE_ALL_SUBNETS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_OPTION4 = "PGSQL_CB_DELETE_BY_POOL_OPTION4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_OPTION4_RESULT = "PGSQL_CB_DELETE_BY_POOL_OPTION4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_OPTION6 = "PGSQL_CB_DELETE_BY_POOL_OPTION6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_OPTION6_RESULT = "PGSQL_CB_DELETE_BY_POOL_OPTION6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6 = "PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT = "PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_PREFIX_SUBNET4 = "PGSQL_CB_DELETE_BY_PREFIX_SUBNET4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT = "PGSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_PREFIX_SUBNET6 = "PGSQL_CB_DELETE_BY_PREFIX_SUBNET6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT = "PGSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4 = "PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT = "PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6 = "PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT = "PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4 = "PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT = "PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6 = "PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT = "PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_CLIENT_CLASS4 = "PGSQL_CB_DELETE_CLIENT_CLASS4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_CLIENT_CLASS4_RESULT = "PGSQL_CB_DELETE_CLIENT_CLASS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_CLIENT_CLASS6 = "PGSQL_CB_DELETE_CLIENT_CLASS6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_CLIENT_CLASS6_RESULT = "PGSQL_CB_DELETE_CLIENT_CLASS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_GLOBAL_PARAMETER4 = "PGSQL_CB_DELETE_GLOBAL_PARAMETER4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT = "PGSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_GLOBAL_PARAMETER6 = "PGSQL_CB_DELETE_GLOBAL_PARAMETER6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT = "PGSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION4 = "PGSQL_CB_DELETE_OPTION4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION4_RESULT = "PGSQL_CB_DELETE_OPTION4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION6 = "PGSQL_CB_DELETE_OPTION6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION6_RESULT = "PGSQL_CB_DELETE_OPTION6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION_DEF4 = "PGSQL_CB_DELETE_OPTION_DEF4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION_DEF4_RESULT = "PGSQL_CB_DELETE_OPTION_DEF4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION_DEF6 = "PGSQL_CB_DELETE_OPTION_DEF6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION_DEF6_RESULT = "PGSQL_CB_DELETE_OPTION_DEF6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SERVER4 = "PGSQL_CB_DELETE_SERVER4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SERVER4_RESULT = "PGSQL_CB_DELETE_SERVER4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SERVER6 = "PGSQL_CB_DELETE_SERVER6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SERVER6_RESULT = "PGSQL_CB_DELETE_SERVER6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK4 = "PGSQL_CB_DELETE_SHARED_NETWORK4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK4_RESULT = "PGSQL_CB_DELETE_SHARED_NETWORK4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK6 = "PGSQL_CB_DELETE_SHARED_NETWORK6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK6_RESULT = "PGSQL_CB_DELETE_SHARED_NETWORK6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4 = "PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT = "PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6 = "PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT = "PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4 = "PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT = "PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6 = "PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6";
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT = "PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_CLIENT_CLASSES4 = "PGSQL_CB_GET_ALL_CLIENT_CLASSES4";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT = "PGSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_CLIENT_CLASSES6 = "PGSQL_CB_GET_ALL_CLIENT_CLASSES6";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT = "PGSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4 = "PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT = "PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6 = "PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT = "PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTIONS4 = "PGSQL_CB_GET_ALL_OPTIONS4";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTIONS4_RESULT = "PGSQL_CB_GET_ALL_OPTIONS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTIONS6 = "PGSQL_CB_GET_ALL_OPTIONS6";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTIONS6_RESULT = "PGSQL_CB_GET_ALL_OPTIONS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTION_DEFS4 = "PGSQL_CB_GET_ALL_OPTION_DEFS4";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTION_DEFS4_RESULT = "PGSQL_CB_GET_ALL_OPTION_DEFS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTION_DEFS6 = "PGSQL_CB_GET_ALL_OPTION_DEFS6";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTION_DEFS6_RESULT = "PGSQL_CB_GET_ALL_OPTION_DEFS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SERVERS4 = "PGSQL_CB_GET_ALL_SERVERS4";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SERVERS4_RESULT = "PGSQL_CB_GET_ALL_SERVERS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SERVERS6 = "PGSQL_CB_GET_ALL_SERVERS6";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SERVERS6_RESULT = "PGSQL_CB_GET_ALL_SERVERS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SHARED_NETWORKS4 = "PGSQL_CB_GET_ALL_SHARED_NETWORKS4";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT = "PGSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SHARED_NETWORKS6 = "PGSQL_CB_GET_ALL_SHARED_NETWORKS6";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT = "PGSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SUBNETS4 = "PGSQL_CB_GET_ALL_SUBNETS4";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SUBNETS4_RESULT = "PGSQL_CB_GET_ALL_SUBNETS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SUBNETS6 = "PGSQL_CB_GET_ALL_SUBNETS6";
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SUBNETS6_RESULT = "PGSQL_CB_GET_ALL_SUBNETS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_CLIENT_CLASS4 = "PGSQL_CB_GET_CLIENT_CLASS4";
+extern const isc::log::MessageID PGSQL_CB_GET_CLIENT_CLASS6 = "PGSQL_CB_GET_CLIENT_CLASS6";
+extern const isc::log::MessageID PGSQL_CB_GET_GLOBAL_PARAMETER4 = "PGSQL_CB_GET_GLOBAL_PARAMETER4";
+extern const isc::log::MessageID PGSQL_CB_GET_GLOBAL_PARAMETER6 = "PGSQL_CB_GET_GLOBAL_PARAMETER6";
+extern const isc::log::MessageID PGSQL_CB_GET_HOST4 = "PGSQL_CB_GET_HOST4";
+extern const isc::log::MessageID PGSQL_CB_GET_HOST6 = "PGSQL_CB_GET_HOST6";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4 = "PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT = "PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6 = "PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT = "PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4 = "PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT = "PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6 = "PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT = "PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTIONS4 = "PGSQL_CB_GET_MODIFIED_OPTIONS4";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTIONS4_RESULT = "PGSQL_CB_GET_MODIFIED_OPTIONS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTIONS6 = "PGSQL_CB_GET_MODIFIED_OPTIONS6";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTIONS6_RESULT = "PGSQL_CB_GET_MODIFIED_OPTIONS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTION_DEFS4 = "PGSQL_CB_GET_MODIFIED_OPTION_DEFS4";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT = "PGSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTION_DEFS6 = "PGSQL_CB_GET_MODIFIED_OPTION_DEFS6";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT = "PGSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4 = "PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT = "PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6 = "PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT = "PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SUBNETS4 = "PGSQL_CB_GET_MODIFIED_SUBNETS4";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SUBNETS4_RESULT = "PGSQL_CB_GET_MODIFIED_SUBNETS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SUBNETS6 = "PGSQL_CB_GET_MODIFIED_SUBNETS6";
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SUBNETS6_RESULT = "PGSQL_CB_GET_MODIFIED_SUBNETS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_OPTION4 = "PGSQL_CB_GET_OPTION4";
+extern const isc::log::MessageID PGSQL_CB_GET_OPTION6 = "PGSQL_CB_GET_OPTION6";
+extern const isc::log::MessageID PGSQL_CB_GET_OPTION_DEF4 = "PGSQL_CB_GET_OPTION_DEF4";
+extern const isc::log::MessageID PGSQL_CB_GET_OPTION_DEF6 = "PGSQL_CB_GET_OPTION_DEF6";
+extern const isc::log::MessageID PGSQL_CB_GET_PORT4 = "PGSQL_CB_GET_PORT4";
+extern const isc::log::MessageID PGSQL_CB_GET_PORT6 = "PGSQL_CB_GET_PORT6";
+extern const isc::log::MessageID PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4 = "PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4";
+extern const isc::log::MessageID PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT = "PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6 = "PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6";
+extern const isc::log::MessageID PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT = "PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_SERVER4 = "PGSQL_CB_GET_SERVER4";
+extern const isc::log::MessageID PGSQL_CB_GET_SERVER6 = "PGSQL_CB_GET_SERVER6";
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK4 = "PGSQL_CB_GET_SHARED_NETWORK4";
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK6 = "PGSQL_CB_GET_SHARED_NETWORK6";
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4 = "PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4";
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT = "PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6 = "PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6";
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT = "PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT";
+extern const isc::log::MessageID PGSQL_CB_GET_SUBNET4_BY_PREFIX = "PGSQL_CB_GET_SUBNET4_BY_PREFIX";
+extern const isc::log::MessageID PGSQL_CB_GET_SUBNET4_BY_SUBNET_ID = "PGSQL_CB_GET_SUBNET4_BY_SUBNET_ID";
+extern const isc::log::MessageID PGSQL_CB_GET_SUBNET6_BY_PREFIX = "PGSQL_CB_GET_SUBNET6_BY_PREFIX";
+extern const isc::log::MessageID PGSQL_CB_GET_SUBNET6_BY_SUBNET_ID = "PGSQL_CB_GET_SUBNET6_BY_SUBNET_ID";
+extern const isc::log::MessageID PGSQL_CB_GET_TYPE4 = "PGSQL_CB_GET_TYPE4";
+extern const isc::log::MessageID PGSQL_CB_GET_TYPE6 = "PGSQL_CB_GET_TYPE6";
+extern const isc::log::MessageID PGSQL_CB_INIT_OK = "PGSQL_CB_INIT_OK";
+extern const isc::log::MessageID PGSQL_CB_NO_TLS_SUPPORT = "PGSQL_CB_NO_TLS_SUPPORT";
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_ATTEMPT_FAILED4 = "PGSQL_CB_RECONNECT_ATTEMPT_FAILED4";
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_ATTEMPT_FAILED6 = "PGSQL_CB_RECONNECT_ATTEMPT_FAILED6";
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4 = "PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4";
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6 = "PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6";
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_FAILED4 = "PGSQL_CB_RECONNECT_FAILED4";
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_FAILED6 = "PGSQL_CB_RECONNECT_FAILED6";
+extern const isc::log::MessageID PGSQL_CB_REGISTER_BACKEND_TYPE4 = "PGSQL_CB_REGISTER_BACKEND_TYPE4";
+extern const isc::log::MessageID PGSQL_CB_REGISTER_BACKEND_TYPE6 = "PGSQL_CB_REGISTER_BACKEND_TYPE6";
+extern const isc::log::MessageID PGSQL_CB_TLS_SUPPORT = "PGSQL_CB_TLS_SUPPORT";
+extern const isc::log::MessageID PGSQL_CB_UNREGISTER_BACKEND_TYPE4 = "PGSQL_CB_UNREGISTER_BACKEND_TYPE4";
+extern const isc::log::MessageID PGSQL_CB_UNREGISTER_BACKEND_TYPE6 = "PGSQL_CB_UNREGISTER_BACKEND_TYPE6";
+
+} // namespace cb
+} // namespace isc
+
+namespace {
+
+const char* values[] = {
+    "PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4", "create or update option pool start: %1 pool end: %2",
+    "PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6", "create or update option pool start: %1 pool end: %2",
+    "PGSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6", "create or update option prefix: %1 prefix len: %2",
+    "PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4", "create or update option by subnet id: %1",
+    "PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6", "create or update option by subnet id: %1",
+    "PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS4", "create or update client class: %1",
+    "PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS6", "create or update client class: %1",
+    "PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4", "create or update global parameter: %1",
+    "PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6", "create or update global parameter: %1",
+    "PGSQL_CB_CREATE_UPDATE_OPTION4", "create or update option",
+    "PGSQL_CB_CREATE_UPDATE_OPTION6", "create or update option",
+    "PGSQL_CB_CREATE_UPDATE_OPTION_DEF4", "create or update option definition: %1 code: %2",
+    "PGSQL_CB_CREATE_UPDATE_OPTION_DEF6", "create or update option definition: %1 code: %2",
+    "PGSQL_CB_CREATE_UPDATE_SERVER4", "create or update server: %1",
+    "PGSQL_CB_CREATE_UPDATE_SERVER6", "create or update server: %1",
+    "PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK4", "create or update shared network: %1",
+    "PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK6", "create or update shared network: %1",
+    "PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4", "create or update shared network: %1 option",
+    "PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6", "create or update shared network: %1 option",
+    "PGSQL_CB_CREATE_UPDATE_SUBNET4", "create or update subnet: %1",
+    "PGSQL_CB_CREATE_UPDATE_SUBNET6", "create or update subnet: %1",
+    "PGSQL_CB_DEINIT_OK", "unloading Postgres CB hooks library successful",
+    "PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4", "delete all client classes",
+    "PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6", "delete all client classes",
+    "PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4", "delete all global parameters",
+    "PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6", "delete all global parameters",
+    "PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_ALL_OPTION_DEFS4", "delete all option definitions",
+    "PGSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_ALL_OPTION_DEFS6", "delete all option definitions",
+    "PGSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_ALL_SERVERS4", "delete all DHCPv4 servers",
+    "PGSQL_CB_DELETE_ALL_SERVERS4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_ALL_SERVERS6", "delete all DHCPv6 servers",
+    "PGSQL_CB_DELETE_ALL_SERVERS6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4", "delete all shared networks",
+    "PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6", "delete all shared networks",
+    "PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_ALL_SUBNETS4", "delete all subnets",
+    "PGSQL_CB_DELETE_ALL_SUBNETS4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_ALL_SUBNETS6", "delete all subnets",
+    "PGSQL_CB_DELETE_ALL_SUBNETS6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_BY_POOL_OPTION4", "delete pool start: %1 pool end: %2 option code: %3 space: %4",
+    "PGSQL_CB_DELETE_BY_POOL_OPTION4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_BY_POOL_OPTION6", "delete pool start: %1 pool end: %2 option code: %3 space: %4",
+    "PGSQL_CB_DELETE_BY_POOL_OPTION6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6", "delete prefix: %1 prefix len: %2 option code: %3 space: %4",
+    "PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_BY_PREFIX_SUBNET4", "delete subnet by prefix: %1",
+    "PGSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_BY_PREFIX_SUBNET6", "delete subnet by prefix: %1",
+    "PGSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4", "delete by subnet id: %1 option code: %2 space: %3",
+    "PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6", "delete by subnet id: %1 option code: %2 space: %3",
+    "PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4", "delete subnet by subnet id: %1",
+    "PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6", "delete subnet by subnet id: %1",
+    "PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_CLIENT_CLASS4", "delete client class: %1",
+    "PGSQL_CB_DELETE_CLIENT_CLASS4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_CLIENT_CLASS6", "delete client class: %1",
+    "PGSQL_CB_DELETE_CLIENT_CLASS6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_GLOBAL_PARAMETER4", "delete global parameter: %1",
+    "PGSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_GLOBAL_PARAMETER6", "delete global parameter: %1",
+    "PGSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_OPTION4", "delete option code: %1 space: %2",
+    "PGSQL_CB_DELETE_OPTION4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_OPTION6", "delete option code: %1 space: %2",
+    "PGSQL_CB_DELETE_OPTION6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_OPTION_DEF4", "delete option definition code: %1 space: %2",
+    "PGSQL_CB_DELETE_OPTION_DEF4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_OPTION_DEF6", "delete option definition code: %1 space: %2",
+    "PGSQL_CB_DELETE_OPTION_DEF6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_SERVER4", "delete DHCPv4 server: %1",
+    "PGSQL_CB_DELETE_SERVER4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_SERVER6", "delete DHCPv6 server: %1",
+    "PGSQL_CB_DELETE_SERVER6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_SHARED_NETWORK4", "delete shared network: %1",
+    "PGSQL_CB_DELETE_SHARED_NETWORK4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_SHARED_NETWORK6", "delete shared network: %1",
+    "PGSQL_CB_DELETE_SHARED_NETWORK6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4", "delete shared network: %1 option code: %2 space: %3",
+    "PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6", "delete shared network: %1 option code: %2 space: %3",
+    "PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4", "delete shared network: %1 subnets",
+    "PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6", "delete shared network: %1 subnets",
+    "PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT", "deleted: %1 entries",
+    "PGSQL_CB_GET_ALL_CLIENT_CLASSES4", "retrieving all client classes",
+    "PGSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_CLIENT_CLASSES6", "retrieving all client classes",
+    "PGSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4", "retrieving all global parameters",
+    "PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6", "retrieving all global parameters",
+    "PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_OPTIONS4", "retrieving all options",
+    "PGSQL_CB_GET_ALL_OPTIONS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_OPTIONS6", "retrieving all options",
+    "PGSQL_CB_GET_ALL_OPTIONS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_OPTION_DEFS4", "retrieving all option definitions",
+    "PGSQL_CB_GET_ALL_OPTION_DEFS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_OPTION_DEFS6", "retrieving all option definitions",
+    "PGSQL_CB_GET_ALL_OPTION_DEFS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_SERVERS4", "retrieving all servers",
+    "PGSQL_CB_GET_ALL_SERVERS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_SERVERS6", "retrieving all DHCPv6 servers",
+    "PGSQL_CB_GET_ALL_SERVERS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_SHARED_NETWORKS4", "retrieving all shared networks",
+    "PGSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_SHARED_NETWORKS6", "retrieving all shared networks",
+    "PGSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_SUBNETS4", "retrieving all subnets",
+    "PGSQL_CB_GET_ALL_SUBNETS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_ALL_SUBNETS6", "retrieving all subnets",
+    "PGSQL_CB_GET_ALL_SUBNETS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_CLIENT_CLASS4", "retrieving client class: %1",
+    "PGSQL_CB_GET_CLIENT_CLASS6", "retrieving client class: %1",
+    "PGSQL_CB_GET_GLOBAL_PARAMETER4", "retrieving global parameter: %1",
+    "PGSQL_CB_GET_GLOBAL_PARAMETER6", "retrieving global parameter: %1",
+    "PGSQL_CB_GET_HOST4", "get host",
+    "PGSQL_CB_GET_HOST6", "get host",
+    "PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4", "retrieving modified client classes from: %1",
+    "PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6", "retrieving modified client classes from: %1",
+    "PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4", "retrieving modified global parameters from: %1",
+    "PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6", "retrieving modified global parameters from: %1",
+    "PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_MODIFIED_OPTIONS4", "retrieving modified options from: %1",
+    "PGSQL_CB_GET_MODIFIED_OPTIONS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_MODIFIED_OPTIONS6", "retrieving modified options from: %1",
+    "PGSQL_CB_GET_MODIFIED_OPTIONS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_MODIFIED_OPTION_DEFS4", "retrieving modified option definitions from: %1",
+    "PGSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_MODIFIED_OPTION_DEFS6", "retrieving modified option definitions from: %1",
+    "PGSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4", "retrieving modified shared networks from: %1",
+    "PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6", "retrieving modified shared networks from: %1",
+    "PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_MODIFIED_SUBNETS4", "retrieving modified subnets from: %1",
+    "PGSQL_CB_GET_MODIFIED_SUBNETS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_MODIFIED_SUBNETS6", "retrieving modified subnets from: %1",
+    "PGSQL_CB_GET_MODIFIED_SUBNETS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_OPTION4", "retrieving option code: %1 space: %2",
+    "PGSQL_CB_GET_OPTION6", "retrieving option code: %1 space: %2",
+    "PGSQL_CB_GET_OPTION_DEF4", "retrieving option definition code: %1 space: %2",
+    "PGSQL_CB_GET_OPTION_DEF6", "retrieving option definition code: %1 space: %2",
+    "PGSQL_CB_GET_PORT4", "get port",
+    "PGSQL_CB_GET_PORT6", "get port",
+    "PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4", "retrieving audit entries from: %1 %2",
+    "PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6", "retrieving audit entries from: %1 %2",
+    "PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_SERVER4", "retrieving DHCPv4 server: %1",
+    "PGSQL_CB_GET_SERVER6", "retrieving DHCPv6 server: %1",
+    "PGSQL_CB_GET_SHARED_NETWORK4", "retrieving shared network: %1",
+    "PGSQL_CB_GET_SHARED_NETWORK6", "retrieving shared network: %1",
+    "PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4", "retrieving shared network: %1 subnets",
+    "PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6", "retrieving shared network: %1 subnets",
+    "PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT", "retrieving: %1 elements",
+    "PGSQL_CB_GET_SUBNET4_BY_PREFIX", "retrieving subnet by prefix: %1",
+    "PGSQL_CB_GET_SUBNET4_BY_SUBNET_ID", "retrieving subnet by subnet id: %1",
+    "PGSQL_CB_GET_SUBNET6_BY_PREFIX", "retrieving subnet by prefix: %1",
+    "PGSQL_CB_GET_SUBNET6_BY_SUBNET_ID", "retrieving subnet by subnet id: %1",
+    "PGSQL_CB_GET_TYPE4", "get type",
+    "PGSQL_CB_GET_TYPE6", "get type",
+    "PGSQL_CB_INIT_OK", "loading Postgres CB hooks library successful",
+    "PGSQL_CB_NO_TLS_SUPPORT", "Attempt to configure TLS (unsupported for PostgreSQL): %1",
+    "PGSQL_CB_RECONNECT_ATTEMPT_FAILED4", "database reconnect failed: %1",
+    "PGSQL_CB_RECONNECT_ATTEMPT_FAILED6", "database reconnect failed: %1",
+    "PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4", "scheduling attempt %1 of %2 in %3 milliseconds",
+    "PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6", "scheduling attempt %1 of %2 in %3 milliseconds",
+    "PGSQL_CB_RECONNECT_FAILED4", "maximum number of database reconnect attempts: %1, has been exhausted without success",
+    "PGSQL_CB_RECONNECT_FAILED6", "maximum number of database reconnect attempts: %1, has been exhausted without success",
+    "PGSQL_CB_REGISTER_BACKEND_TYPE4", "register backend",
+    "PGSQL_CB_REGISTER_BACKEND_TYPE6", "register backend",
+    "PGSQL_CB_TLS_SUPPORT", "Attempt to configure TLS: %1",
+    "PGSQL_CB_UNREGISTER_BACKEND_TYPE4", "unregister backend",
+    "PGSQL_CB_UNREGISTER_BACKEND_TYPE6", "unregister backend",
+    NULL
+};
+
+const isc::log::MessageInitializer initializer(values);
+
+} // Anonymous namespace
+
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.h b/src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.h
new file mode 100644
index 0000000..57a41d3
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.h
@@ -0,0 +1,206 @@
+// File created from ../../../../src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.mes
+
+#ifndef PGSQL_CB_MESSAGES_H
+#define PGSQL_CB_MESSAGES_H
+
+#include <log/message_types.h>
+
+namespace isc {
+namespace cb {
+
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS4;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS6;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_OPTION4;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_OPTION6;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_OPTION_DEF4;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_OPTION_DEF6;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SERVER4;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SERVER6;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK4;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK6;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SUBNET4;
+extern const isc::log::MessageID PGSQL_CB_CREATE_UPDATE_SUBNET6;
+extern const isc::log::MessageID PGSQL_CB_DEINIT_OK;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_OPTION_DEFS4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_OPTION_DEFS6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SERVERS4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SERVERS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SERVERS6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SERVERS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SUBNETS4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SUBNETS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SUBNETS6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_ALL_SUBNETS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_OPTION4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_OPTION4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_OPTION6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_OPTION6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_PREFIX_SUBNET4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_PREFIX_SUBNET6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_CLIENT_CLASS4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_CLIENT_CLASS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_CLIENT_CLASS6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_CLIENT_CLASS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_GLOBAL_PARAMETER4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_GLOBAL_PARAMETER6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION_DEF4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION_DEF4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION_DEF6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_OPTION_DEF6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SERVER4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SERVER4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SERVER6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SERVER6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6;
+extern const isc::log::MessageID PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_CLIENT_CLASSES4;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_CLIENT_CLASSES6;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTIONS4;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTIONS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTIONS6;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTIONS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTION_DEFS4;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTION_DEFS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTION_DEFS6;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_OPTION_DEFS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SERVERS4;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SERVERS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SERVERS6;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SERVERS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SHARED_NETWORKS4;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SHARED_NETWORKS6;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SUBNETS4;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SUBNETS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SUBNETS6;
+extern const isc::log::MessageID PGSQL_CB_GET_ALL_SUBNETS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_CLIENT_CLASS4;
+extern const isc::log::MessageID PGSQL_CB_GET_CLIENT_CLASS6;
+extern const isc::log::MessageID PGSQL_CB_GET_GLOBAL_PARAMETER4;
+extern const isc::log::MessageID PGSQL_CB_GET_GLOBAL_PARAMETER6;
+extern const isc::log::MessageID PGSQL_CB_GET_HOST4;
+extern const isc::log::MessageID PGSQL_CB_GET_HOST6;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTIONS4;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTIONS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTIONS6;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTIONS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTION_DEFS4;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTION_DEFS6;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SUBNETS4;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SUBNETS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SUBNETS6;
+extern const isc::log::MessageID PGSQL_CB_GET_MODIFIED_SUBNETS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_OPTION4;
+extern const isc::log::MessageID PGSQL_CB_GET_OPTION6;
+extern const isc::log::MessageID PGSQL_CB_GET_OPTION_DEF4;
+extern const isc::log::MessageID PGSQL_CB_GET_OPTION_DEF6;
+extern const isc::log::MessageID PGSQL_CB_GET_PORT4;
+extern const isc::log::MessageID PGSQL_CB_GET_PORT6;
+extern const isc::log::MessageID PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4;
+extern const isc::log::MessageID PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6;
+extern const isc::log::MessageID PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_SERVER4;
+extern const isc::log::MessageID PGSQL_CB_GET_SERVER6;
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK4;
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK6;
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4;
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6;
+extern const isc::log::MessageID PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT;
+extern const isc::log::MessageID PGSQL_CB_GET_SUBNET4_BY_PREFIX;
+extern const isc::log::MessageID PGSQL_CB_GET_SUBNET4_BY_SUBNET_ID;
+extern const isc::log::MessageID PGSQL_CB_GET_SUBNET6_BY_PREFIX;
+extern const isc::log::MessageID PGSQL_CB_GET_SUBNET6_BY_SUBNET_ID;
+extern const isc::log::MessageID PGSQL_CB_GET_TYPE4;
+extern const isc::log::MessageID PGSQL_CB_GET_TYPE6;
+extern const isc::log::MessageID PGSQL_CB_INIT_OK;
+extern const isc::log::MessageID PGSQL_CB_NO_TLS_SUPPORT;
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_ATTEMPT_FAILED4;
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_ATTEMPT_FAILED6;
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4;
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6;
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_FAILED4;
+extern const isc::log::MessageID PGSQL_CB_RECONNECT_FAILED6;
+extern const isc::log::MessageID PGSQL_CB_REGISTER_BACKEND_TYPE4;
+extern const isc::log::MessageID PGSQL_CB_REGISTER_BACKEND_TYPE6;
+extern const isc::log::MessageID PGSQL_CB_TLS_SUPPORT;
+extern const isc::log::MessageID PGSQL_CB_UNREGISTER_BACKEND_TYPE4;
+extern const isc::log::MessageID PGSQL_CB_UNREGISTER_BACKEND_TYPE6;
+
+} // namespace cb
+} // namespace isc
+
+#endif // PGSQL_CB_MESSAGES_H
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.mes b/src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.mes
new file mode 100644
index 0000000..8855ece
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_cb_messages.mes
@@ -0,0 +1,595 @@
+# Copyright (C) 2021-2023 Internet Systems Consortium, Inc. ("ISC")
+
+$NAMESPACE isc::cb
+
+% PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION4 create or update option pool start: %1 pool end: %2
+Debug message issued when triggered an action to create or update option by pool
+
+% PGSQL_CB_CREATE_UPDATE_BY_POOL_OPTION6 create or update option pool start: %1 pool end: %2
+Debug message issued when triggered an action to create or update option by pool
+
+% PGSQL_CB_CREATE_UPDATE_BY_PREFIX_OPTION6 create or update option prefix: %1 prefix len: %2
+Debug message issued when triggered an action to create or update option by prefix
+
+% PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION4 create or update option by subnet id: %1
+Debug message issued when triggered an action to create or update option by subnet id
+
+% PGSQL_CB_CREATE_UPDATE_BY_SUBNET_ID_OPTION6 create or update option by subnet id: %1
+Debug message issued when triggered an action to create or update option by subnet id
+
+% PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS4 create or update client class: %1
+Debug message issued when triggered an action to create or update client class
+
+% PGSQL_CB_CREATE_UPDATE_CLIENT_CLASS6 create or update client class: %1
+Debug message issued when triggered an action to create or update client class
+
+% PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER4 create or update global parameter: %1
+Debug message issued when triggered an action to create or update global parameter
+
+% PGSQL_CB_CREATE_UPDATE_GLOBAL_PARAMETER6 create or update global parameter: %1
+Debug message issued when triggered an action to create or update global parameter
+
+% PGSQL_CB_CREATE_UPDATE_OPTION4 create or update option
+Debug message issued when triggered an action to create or update option
+
+% PGSQL_CB_CREATE_UPDATE_OPTION6 create or update option
+Debug message issued when triggered an action to create or update option
+
+% PGSQL_CB_CREATE_UPDATE_OPTION_DEF4 create or update option definition: %1 code: %2
+Debug message issued when triggered an action to create or update option definition
+
+% PGSQL_CB_CREATE_UPDATE_OPTION_DEF6 create or update option definition: %1 code: %2
+Debug message issued when triggered an action to create or update option definition
+
+% PGSQL_CB_CREATE_UPDATE_SERVER4 create or update server: %1
+Debug message issued when triggered an action to create or update a DHCPv4
+server information.
+
+% PGSQL_CB_CREATE_UPDATE_SERVER6 create or update server: %1
+Debug message issued when triggered an action to create or update a DHCPv6
+server information.
+
+% PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK4 create or update shared network: %1
+Debug message issued when triggered an action to create or update shared network
+
+% PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK6 create or update shared network: %1
+Debug message issued when triggered an action to create or update shared network
+
+% PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION4 create or update shared network: %1 option
+Debug message issued when triggered an action to create or update shared network option
+
+% PGSQL_CB_CREATE_UPDATE_SHARED_NETWORK_OPTION6 create or update shared network: %1 option
+Debug message issued when triggered an action to create or update shared network option
+
+% PGSQL_CB_CREATE_UPDATE_SUBNET4 create or update subnet: %1
+Debug message issued when triggered an action to create or update subnet
+
+% PGSQL_CB_CREATE_UPDATE_SUBNET6 create or update subnet: %1
+Debug message issued when triggered an action to create or update subnet
+
+% PGSQL_CB_DEINIT_OK unloading Postgres CB hooks library successful
+This informational message indicates that the Postgres Configuration Backend hooks
+library has been unloaded successfully.
+
+% PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4 delete all client classes
+Debug message issued when triggered an action to delete all client classes
+
+% PGSQL_CB_DELETE_ALL_CLIENT_CLASSES4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all client classes
+
+% PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6 delete all client classes
+Debug message issued when triggered an action to delete all client classes
+
+% PGSQL_CB_DELETE_ALL_CLIENT_CLASSES6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all client classes
+
+% PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4 delete all global parameters
+Debug message issued when triggered an action to delete all global parameters
+
+% PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all global parameters
+
+% PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6 delete all global parameters
+Debug message issued when triggered an action to delete all global parameters
+
+% PGSQL_CB_DELETE_ALL_GLOBAL_PARAMETERS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all global parameters
+
+% PGSQL_CB_DELETE_ALL_OPTION_DEFS4 delete all option definitions
+Debug message issued when triggered an action to delete all option definitions
+
+% PGSQL_CB_DELETE_ALL_OPTION_DEFS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all option definitions
+
+% PGSQL_CB_DELETE_ALL_OPTION_DEFS6 delete all option definitions
+Debug message issued when triggered an action to delete all option definitions
+
+% PGSQL_CB_DELETE_ALL_OPTION_DEFS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all option definitions
+
+% PGSQL_CB_DELETE_ALL_SERVERS4 delete all DHCPv4 servers
+Debug message issued when triggered an action to delete all servers.
+
+% PGSQL_CB_DELETE_ALL_SERVERS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all servers.
+
+% PGSQL_CB_DELETE_ALL_SERVERS6 delete all DHCPv6 servers
+Debug message issued when triggered an action to delete all servers.
+
+% PGSQL_CB_DELETE_ALL_SERVERS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all servers.
+
+% PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4 delete all shared networks
+Debug message issued when triggered an action to delete all shared networks
+
+% PGSQL_CB_DELETE_ALL_SHARED_NETWORKS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all shared networks
+
+% PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6 delete all shared networks
+Debug message issued when triggered an action to delete all shared networks
+
+% PGSQL_CB_DELETE_ALL_SHARED_NETWORKS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all shared networks
+
+% PGSQL_CB_DELETE_ALL_SUBNETS4 delete all subnets
+Debug message issued when triggered an action to delete all subnets
+
+% PGSQL_CB_DELETE_ALL_SUBNETS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all subnets
+
+% PGSQL_CB_DELETE_ALL_SUBNETS6 delete all subnets
+Debug message issued when triggered an action to delete all subnets
+
+% PGSQL_CB_DELETE_ALL_SUBNETS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete all subnets
+
+% PGSQL_CB_DELETE_BY_POOL_OPTION4 delete pool start: %1 pool end: %2 option code: %3 space: %4
+Debug message issued when triggered an action to delete option by pool
+
+% PGSQL_CB_DELETE_BY_POOL_OPTION4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option by pool
+
+% PGSQL_CB_DELETE_BY_POOL_OPTION6 delete pool start: %1 pool end: %2 option code: %3 space: %4
+Debug message issued when triggered an action to delete option by pool
+
+% PGSQL_CB_DELETE_BY_POOL_OPTION6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option by pool
+
+% PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6 delete prefix: %1 prefix len: %2 option code: %3 space: %4
+Debug message issued when triggered an action to delete option by prefix
+
+% PGSQL_CB_DELETE_BY_POOL_PREFIX_OPTION6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option by prefix
+
+% PGSQL_CB_DELETE_BY_PREFIX_SUBNET4 delete subnet by prefix: %1
+Debug message issued when triggered an action to delete subnet by prefix
+
+% PGSQL_CB_DELETE_BY_PREFIX_SUBNET4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete subnet by prefix
+
+% PGSQL_CB_DELETE_BY_PREFIX_SUBNET6 delete subnet by prefix: %1
+Debug message issued when triggered an action to delete subnet by prefix
+
+% PGSQL_CB_DELETE_BY_PREFIX_SUBNET6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete subnet by prefix
+
+% PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4 delete by subnet id: %1 option code: %2 space: %3
+Debug message issued when triggered an action to delete option by subnet id
+
+% PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option by subnet id
+
+% PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6 delete by subnet id: %1 option code: %2 space: %3
+Debug message issued when triggered an action to delete option by subnet id
+
+% PGSQL_CB_DELETE_BY_SUBNET_ID_OPTION6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option by subnet id
+
+% PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4 delete subnet by subnet id: %1
+Debug message issued when triggered an action to delete subnet by subnet id
+
+% PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete subnet by subnet id
+
+% PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6 delete subnet by subnet id: %1
+Debug message issued when triggered an action to delete subnet by subnet id
+
+% PGSQL_CB_DELETE_BY_SUBNET_ID_SUBNET6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete subnet by subnet id
+
+% PGSQL_CB_DELETE_CLIENT_CLASS4 delete client class: %1
+Debug message issued when triggered an action to delete client class
+
+% PGSQL_CB_DELETE_CLIENT_CLASS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete client class
+
+% PGSQL_CB_DELETE_CLIENT_CLASS6 delete client class: %1
+Debug message issued when triggered an action to delete client class
+
+% PGSQL_CB_DELETE_CLIENT_CLASS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete client class
+
+% PGSQL_CB_DELETE_GLOBAL_PARAMETER4 delete global parameter: %1
+Debug message issued when triggered an action to delete global parameter
+
+% PGSQL_CB_DELETE_GLOBAL_PARAMETER4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete global parameter
+
+% PGSQL_CB_DELETE_GLOBAL_PARAMETER6 delete global parameter: %1
+Debug message issued when triggered an action to delete global parameter
+
+% PGSQL_CB_DELETE_GLOBAL_PARAMETER6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete global parameter
+
+% PGSQL_CB_DELETE_OPTION4 delete option code: %1 space: %2
+Debug message issued when triggered an action to delete option
+
+% PGSQL_CB_DELETE_OPTION4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option
+
+% PGSQL_CB_DELETE_OPTION6 delete option code: %1 space: %2
+Debug message issued when triggered an action to delete option
+
+% PGSQL_CB_DELETE_OPTION6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option
+
+% PGSQL_CB_DELETE_OPTION_DEF4 delete option definition code: %1 space: %2
+Debug message issued when triggered an action to delete option definition
+
+% PGSQL_CB_DELETE_OPTION_DEF4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option definition
+
+% PGSQL_CB_DELETE_OPTION_DEF6 delete option definition code: %1 space: %2
+Debug message issued when triggered an action to delete option definition
+
+% PGSQL_CB_DELETE_OPTION_DEF6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete option definition
+
+% PGSQL_CB_DELETE_SERVER4 delete DHCPv4 server: %1
+Debug message issued when triggered an action to delete a server.
+
+% PGSQL_CB_DELETE_SERVER4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete a server.
+
+% PGSQL_CB_DELETE_SERVER6 delete DHCPv6 server: %1
+Debug message issued when triggered an action to delete a server.
+
+% PGSQL_CB_DELETE_SERVER6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete a server.
+
+% PGSQL_CB_DELETE_SHARED_NETWORK4 delete shared network: %1
+Debug message issued when triggered an action to delete shared network
+
+% PGSQL_CB_DELETE_SHARED_NETWORK4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network
+
+% PGSQL_CB_DELETE_SHARED_NETWORK6 delete shared network: %1
+Debug message issued when triggered an action to delete shared network
+
+% PGSQL_CB_DELETE_SHARED_NETWORK6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network
+
+% PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4 delete shared network: %1 option code: %2 space: %3
+Debug message issued when triggered an action to delete shared network option
+
+% PGSQL_CB_DELETE_SHARED_NETWORK_OPTION4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network option
+
+% PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6 delete shared network: %1 option code: %2 space: %3
+Debug message issued when triggered an action to delete shared network option
+
+% PGSQL_CB_DELETE_SHARED_NETWORK_OPTION6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network option
+
+% PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4 delete shared network: %1 subnets
+Debug message issued when triggered an action to delete shared network subnets
+
+% PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network subnets
+
+% PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6 delete shared network: %1 subnets
+Debug message issued when triggered an action to delete shared network subnets
+
+% PGSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6_RESULT deleted: %1 entries
+Debug message indicating the result of an action to delete shared network subnets
+
+% PGSQL_CB_GET_ALL_CLIENT_CLASSES4 retrieving all client classes
+Debug message issued when triggered an action to retrieve all client classes
+
+% PGSQL_CB_GET_ALL_CLIENT_CLASSES4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all client classes
+
+% PGSQL_CB_GET_ALL_CLIENT_CLASSES6 retrieving all client classes
+Debug message issued when triggered an action to retrieve all client classes
+
+% PGSQL_CB_GET_ALL_CLIENT_CLASSES6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all client classes
+
+% PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4 retrieving all global parameters
+Debug message issued when triggered an action to retrieve all global parameters
+
+% PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all global parameters
+
+% PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6 retrieving all global parameters
+Debug message issued when triggered an action to retrieve all global parameters
+
+% PGSQL_CB_GET_ALL_GLOBAL_PARAMETERS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all global parameters
+
+% PGSQL_CB_GET_ALL_OPTIONS4 retrieving all options
+Debug message issued when triggered an action to retrieve all options
+
+% PGSQL_CB_GET_ALL_OPTIONS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all options
+
+% PGSQL_CB_GET_ALL_OPTIONS6 retrieving all options
+Debug message issued when triggered an action to retrieve all options
+
+% PGSQL_CB_GET_ALL_OPTIONS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all options
+
+% PGSQL_CB_GET_ALL_OPTION_DEFS4 retrieving all option definitions
+Debug message issued when triggered an action to retrieve all option definitions
+
+% PGSQL_CB_GET_ALL_OPTION_DEFS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all option definitions
+
+% PGSQL_CB_GET_ALL_OPTION_DEFS6 retrieving all option definitions
+Debug message issued when triggered an action to retrieve all option definitions
+
+% PGSQL_CB_GET_ALL_OPTION_DEFS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all option definitions
+
+% PGSQL_CB_GET_ALL_SERVERS4 retrieving all servers
+Debug message issued when triggered an action to retrieve all DHCPv4
+servers
+
+% PGSQL_CB_GET_ALL_SERVERS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all DHCPv4
+servers
+
+% PGSQL_CB_GET_ALL_SERVERS6 retrieving all DHCPv6 servers
+Debug message issued when triggered an action to retrieve all DHCPv6
+servers
+
+% PGSQL_CB_GET_ALL_SERVERS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all DHCPv6
+servers
+
+% PGSQL_CB_GET_ALL_SHARED_NETWORKS4 retrieving all shared networks
+Debug message issued when triggered an action to retrieve all shared networks
+
+% PGSQL_CB_GET_ALL_SHARED_NETWORKS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all shared networks
+
+% PGSQL_CB_GET_ALL_SHARED_NETWORKS6 retrieving all shared networks
+Debug message issued when triggered an action to retrieve all shared networks
+
+% PGSQL_CB_GET_ALL_SHARED_NETWORKS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all shared networks
+
+% PGSQL_CB_GET_ALL_SUBNETS4 retrieving all subnets
+Debug message issued when triggered an action to retrieve all subnets
+
+% PGSQL_CB_GET_ALL_SUBNETS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all subnets
+
+% PGSQL_CB_GET_ALL_SUBNETS6 retrieving all subnets
+Debug message issued when triggered an action to retrieve all subnets
+
+% PGSQL_CB_GET_ALL_SUBNETS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve all subnets
+
+% PGSQL_CB_GET_CLIENT_CLASS4 retrieving client class: %1
+Debug message issued when triggered an action to retrieve a client class
+
+% PGSQL_CB_GET_CLIENT_CLASS6 retrieving client class: %1
+Debug message issued when triggered an action to retrieve a client class
+
+% PGSQL_CB_GET_GLOBAL_PARAMETER4 retrieving global parameter: %1
+Debug message issued when triggered an action to retrieve global parameter
+
+% PGSQL_CB_GET_GLOBAL_PARAMETER6 retrieving global parameter: %1
+Debug message issued when triggered an action to retrieve global parameter
+
+% PGSQL_CB_GET_HOST4 get host
+Debug message issued when triggered an action to retrieve host
+
+% PGSQL_CB_GET_HOST6 get host
+Debug message issued when triggered an action to retrieve host
+
+% PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4 retrieving modified client classes from: %1
+Debug message issued when triggered an action to retrieve modified client classes from specified time
+
+% PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified client classes from specified time
+
+% PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6 retrieving modified client classes from: %1
+Debug message issued when triggered an action to retrieve modified client classes from specified time
+
+% PGSQL_CB_GET_MODIFIED_CLIENT_CLASSES6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified client classes from specified time
+
+% PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4 retrieving modified global parameters from: %1
+Debug message issued when triggered an action to retrieve modified global parameters from specified time
+
+% PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified global parameters from specified time
+
+% PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6 retrieving modified global parameters from: %1
+Debug message issued when triggered an action to retrieve modified global parameters from specified time
+
+% PGSQL_CB_GET_MODIFIED_GLOBAL_PARAMETERS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified global parameters from specified time
+
+% PGSQL_CB_GET_MODIFIED_OPTIONS4 retrieving modified options from: %1
+Debug message issued when triggered an action to retrieve modified options from specified time
+
+% PGSQL_CB_GET_MODIFIED_OPTIONS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified options from specified time
+
+% PGSQL_CB_GET_MODIFIED_OPTIONS6 retrieving modified options from: %1
+Debug message issued when triggered an action to retrieve modified options from specified time
+
+% PGSQL_CB_GET_MODIFIED_OPTIONS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified options from specified time
+
+% PGSQL_CB_GET_MODIFIED_OPTION_DEFS4 retrieving modified option definitions from: %1
+Debug message issued when triggered an action to retrieve modified option definitions from specified time
+
+% PGSQL_CB_GET_MODIFIED_OPTION_DEFS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified option definitions from specified time
+
+% PGSQL_CB_GET_MODIFIED_OPTION_DEFS6 retrieving modified option definitions from: %1
+Debug message issued when triggered an action to retrieve modified option definitions from specified time
+
+% PGSQL_CB_GET_MODIFIED_OPTION_DEFS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified option definitions from specified time
+
+% PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4 retrieving modified shared networks from: %1
+Debug message issued when triggered an action to retrieve modified shared networks from specified time
+
+% PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified shared networks from specified time
+
+% PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6 retrieving modified shared networks from: %1
+Debug message issued when triggered an action to retrieve modified shared networks from specified time
+
+% PGSQL_CB_GET_MODIFIED_SHARED_NETWORKS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified shared networks from specified time
+
+% PGSQL_CB_GET_MODIFIED_SUBNETS4 retrieving modified subnets from: %1
+Debug message issued when triggered an action to retrieve modified subnets from specified time
+
+% PGSQL_CB_GET_MODIFIED_SUBNETS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified subnets from specified time
+
+% PGSQL_CB_GET_MODIFIED_SUBNETS6 retrieving modified subnets from: %1
+Debug message issued when triggered an action to retrieve modified subnets from specified time
+
+% PGSQL_CB_GET_MODIFIED_SUBNETS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve modified subnets from specified time
+
+% PGSQL_CB_GET_OPTION4 retrieving option code: %1 space: %2
+Debug message issued when triggered an action to retrieve option
+
+% PGSQL_CB_GET_OPTION6 retrieving option code: %1 space: %2
+Debug message issued when triggered an action to retrieve option
+
+% PGSQL_CB_GET_OPTION_DEF4 retrieving option definition code: %1 space: %2
+Debug message issued when triggered an action to retrieve option definition
+
+% PGSQL_CB_GET_OPTION_DEF6 retrieving option definition code: %1 space: %2
+Debug message issued when triggered an action to retrieve option definition
+
+% PGSQL_CB_GET_PORT4 get port
+Debug message issued when triggered an action to retrieve port
+
+% PGSQL_CB_GET_PORT6 get port
+Debug message issued when triggered an action to retrieve port
+
+% PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4 retrieving audit entries from: %1 %2
+Debug message issued when triggered an action to retrieve audit entries from specified time and id.
+
+% PGSQL_CB_GET_RECENT_AUDIT_ENTRIES4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve audit entries from specified time
+
+% PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6 retrieving audit entries from: %1 %2
+Debug message issued when triggered an action to retrieve audit entries from specified time and id
+
+% PGSQL_CB_GET_RECENT_AUDIT_ENTRIES6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve audit entries from specified time
+
+% PGSQL_CB_GET_SERVER4 retrieving DHCPv4 server: %1
+Debug message issued when triggered an action to retrieve a DHCPv4 server information.
+
+% PGSQL_CB_GET_SERVER6 retrieving DHCPv6 server: %1
+Debug message issued when triggered an action to retrieve a DHCPv6 server information.
+
+% PGSQL_CB_GET_SHARED_NETWORK4 retrieving shared network: %1
+Debug message issued when triggered an action to retrieve shared network
+
+% PGSQL_CB_GET_SHARED_NETWORK6 retrieving shared network: %1
+Debug message issued when triggered an action to retrieve shared network
+
+% PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4 retrieving shared network: %1 subnets
+Debug message issued when triggered an action to retrieve shared network subnets
+
+% PGSQL_CB_GET_SHARED_NETWORK_SUBNETS4_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve shared network subnets
+
+% PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6 retrieving shared network: %1 subnets
+Debug message issued when triggered an action to retrieve shared network subnets
+
+% PGSQL_CB_GET_SHARED_NETWORK_SUBNETS6_RESULT retrieving: %1 elements
+Debug message indicating the result of an action to retrieve shared network subnets
+
+% PGSQL_CB_GET_SUBNET4_BY_PREFIX retrieving subnet by prefix: %1
+Debug message issued when triggered an action to retrieve subnet by prefix
+
+% PGSQL_CB_GET_SUBNET4_BY_SUBNET_ID retrieving subnet by subnet id: %1
+Debug message issued when triggered an action to retrieve subnet by subnet id
+
+% PGSQL_CB_GET_SUBNET6_BY_PREFIX retrieving subnet by prefix: %1
+Debug message issued when triggered an action to retrieve subnet by prefix
+
+% PGSQL_CB_GET_SUBNET6_BY_SUBNET_ID retrieving subnet by subnet id: %1
+Debug message issued when triggered an action to retrieve subnet by subnet id
+
+% PGSQL_CB_GET_TYPE4 get type
+Debug message issued when triggered an action to retrieve type
+
+% PGSQL_CB_GET_TYPE6 get type
+Debug message issued when triggered an action to retrieve type
+
+% PGSQL_CB_INIT_OK loading Postgres CB hooks library successful
+This informational message indicates that the Postgres Configuration Backend hooks
+library has been loaded successfully. Enjoy!
+
+% PGSQL_CB_NO_TLS_SUPPORT Attempt to configure TLS (unsupported for PostgreSQL): %1
+This error message is printed when TLS support was required in the Kea
+configuration: Kea was built with this feature disabled for PostgreSQL.
+The parameters of the connection are logged.
+
+% PGSQL_CB_RECONNECT_ATTEMPT_FAILED4 database reconnect failed: %1
+Error message issued when an attempt to reconnect has failed.
+
+% PGSQL_CB_RECONNECT_ATTEMPT_FAILED6 database reconnect failed: %1
+Error message issued when an attempt to reconnect has failed.
+
+% PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE4 scheduling attempt %1 of %2 in %3 milliseconds
+Info message issued when the server is scheduling the next attempt to reconnect
+to the database.  This occurs when the server has lost database connectivity and
+is attempting to reconnect automatically.
+
+% PGSQL_CB_RECONNECT_ATTEMPT_SCHEDULE6 scheduling attempt %1 of %2 in %3 milliseconds
+Info message issued when the server is scheduling the next attempt to reconnect
+to the database.  This occurs when the server has lost database connectivity and
+is attempting to reconnect automatically.
+
+% PGSQL_CB_RECONNECT_FAILED4 maximum number of database reconnect attempts: %1, has been exhausted without success
+Error message issued when the server failed to reconnect.  Loss of connectivity
+is typically a network or database server issue.
+
+% PGSQL_CB_RECONNECT_FAILED6 maximum number of database reconnect attempts: %1, has been exhausted without success
+Error message issued when the server failed to reconnect.  Loss of connectivity
+is typically a network or database server issue.
+
+% PGSQL_CB_REGISTER_BACKEND_TYPE4 register backend
+Debug message issued when triggered an action to register backend
+
+% PGSQL_CB_REGISTER_BACKEND_TYPE6 register backend
+Debug message issued when triggered an action to register backend
+
+% PGSQL_CB_TLS_SUPPORT Attempt to configure TLS: %1
+This informational message is printed when TLS support was required in
+the Kea configuration: The TLS support in PostgreSQL will be initialized but
+its configuration is fully managed outside the C API.
+The parameters of the connection are logged.
+
+% PGSQL_CB_UNREGISTER_BACKEND_TYPE4 unregister backend
+Debug message issued when triggered an action to unregister backend
+
+% PGSQL_CB_UNREGISTER_BACKEND_TYPE6 unregister backend
+Debug message issued when triggered an action to unregister backend
diff --git a/src/hooks/dhcp/pgsql_cb/pgsql_query_macros_dhcp.h b/src/hooks/dhcp/pgsql_cb/pgsql_query_macros_dhcp.h
new file mode 100644
index 0000000..f30187c
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/pgsql_query_macros_dhcp.h
@@ -0,0 +1,1391 @@
+// Copyright (C) 2021-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PGSQL_QUERY_MACROS_DHCP_H
+#define PGSQL_QUERY_MACROS_DHCP_H
+
+/// @file pgsql_query_macros_dhcp.h
+/// Collection of common macros defining PgSQL prepared statements used
+/// to manage Kea DHCP configuration in the database.
+///
+/// Some of the macros are DHCPv4 specific, other are DHCPv6 specific.
+/// Some macros are common for both DHCP server types. The first
+/// parameter @c table_prefix should be set to @c dhcp4 or @c dhcp6,
+/// depending which DHCP server type it relates to. Provided value
+/// is used as a prefix for PgSQL table names. For example, if the
+/// prefix is set to @c dhcp4, the table name referred to in the
+/// query may be dhcp4_subnet etc. The second argument in the variadic
+/// macro is a part of the WHERE clause in the PgSQL query. The fixed
+/// part of the WHERE clause is included in the macro.
+namespace isc {
+namespace dhcp {
+
+namespace {
+
+#ifndef PGSQL_GET_GLOBAL_PARAMETER
+#define PGSQL_GET_GLOBAL_PARAMETER(table_prefix, ...) \
+    "SELECT" \
+    "  g.id," \
+    "  g.name," \
+    "  g.value," \
+    "  g.parameter_type," \
+    "  gmt_epoch(g.modification_ts) as modification_ts, " \
+    "  s.tag " \
+    "FROM " #table_prefix "_global_parameter AS g " \
+    "INNER JOIN " #table_prefix "_global_parameter_server AS a " \
+    "  ON g.id = a.parameter_id " \
+    "INNER JOIN " #table_prefix "_server AS s " \
+    "  ON (a.server_id = s.id) " \
+    "WHERE (s.tag = $1 OR s.id = 1) " #__VA_ARGS__ \
+    " ORDER BY g.id, s.id"
+#endif
+
+#ifndef PGSQL_GET_SUBNET4
+#define PGSQL_GET_SUBNET4_COMMON(server_join, ...) \
+    "SELECT" \
+    "  s.subnet_id," \
+    "  s.subnet_prefix," \
+    "  s.interface_4o6," \
+    "  s.interface_id_4o6," \
+    "  s.subnet_4o6," \
+    "  s.boot_file_name," \
+    "  s.client_class," \
+    "  s.interface," \
+    "  s.match_client_id," \
+    "  gmt_epoch(s.modification_ts) as modification_ts, " \
+    "  s.next_server," \
+    "  s.rebind_timer," \
+    "  s.relay," \
+    "  s.renew_timer," \
+    "  s.require_client_classes," \
+    "  s.reservations_global," \
+    "  s.server_hostname," \
+    "  s.shared_network_name," \
+    "  s.user_context," \
+    "  s.valid_lifetime," \
+    "  p.id," \
+    "  p.start_address," \
+    "  p.end_address," \
+    "  p.subnet_id," \
+    "  gmt_epoch(p.modification_ts) as modification_ts, " \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp4_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  gmt_epoch(x.modification_ts) as modification_ts, " \
+    "  o.option_id," \
+    "  o.code," \
+    "  o.value," \
+    "  o.formatted_value," \
+    "  o.space," \
+    "  o.persistent," \
+    "  o.cancelled," \
+    "  o.dhcp4_subnet_id," \
+    "  o.scope_id," \
+    "  o.user_context," \
+    "  o.shared_network_name," \
+    "  o.pool_id," \
+    "  gmt_epoch(o.modification_ts) as modification_ts, " \
+    "  s.calculate_tee_times," \
+    "  s.t1_percent," \
+    "  s.t2_percent," \
+    "  s.authoritative," \
+    "  s.min_valid_lifetime," \
+    "  s.max_valid_lifetime," \
+    "  p.client_class," \
+    "  p.require_client_classes," \
+    "  p.user_context," \
+    "  s.ddns_send_updates," \
+    "  s.ddns_override_no_update," \
+    "  s.ddns_override_client_update," \
+    "  s.ddns_replace_client_name," \
+    "  s.ddns_generated_prefix," \
+    "  s.ddns_qualifying_suffix," \
+    "  s.reservations_in_subnet," \
+    "  s.reservations_out_of_pool," \
+    "  s.cache_threshold," \
+    "  s.cache_max_age," \
+    "  s.offer_lifetime," \
+    "  s.allocator," \
+    "  srv.tag " \
+    "FROM dhcp4_subnet AS s " \
+    server_join \
+    "LEFT JOIN dhcp4_pool AS p ON s.subnet_id = p.subnet_id " \
+    "LEFT JOIN dhcp4_options AS x ON x.scope_id = 5 AND p.id = x.pool_id " \
+    "LEFT JOIN dhcp4_options AS o ON o.scope_id = 1 AND s.subnet_id = o.dhcp4_subnet_id " \
+    #__VA_ARGS__ \
+    " ORDER BY s.subnet_id, p.id, x.option_id, o.option_id"
+
+#define PGSQL_GET_SUBNET4_NO_TAG(...) \
+    PGSQL_GET_SUBNET4_COMMON( \
+    "INNER JOIN dhcp4_subnet_server AS a " \
+    "  ON s.subnet_id = a.subnet_id " \
+    "INNER JOIN dhcp4_server AS srv " \
+    "  ON (a.server_id = srv.id) ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_SUBNET4_ANY(...) \
+    PGSQL_GET_SUBNET4_COMMON( \
+    "LEFT JOIN dhcp4_subnet_server AS a "\
+    "  ON s.subnet_id = a.subnet_id " \
+    "LEFT JOIN dhcp4_server AS srv " \
+    "  ON a.server_id = srv.id ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_SUBNET4_UNASSIGNED(...) \
+    PGSQL_GET_SUBNET4_COMMON( \
+    "LEFT JOIN dhcp4_subnet_server AS a "\
+    "  ON s.subnet_id = a.subnet_id " \
+    "LEFT JOIN dhcp4_server AS srv " \
+    "  ON a.server_id = srv.id ", \
+    WHERE a.subnet_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_GET_SUBNET6
+#define PGSQL_GET_SUBNET6_COMMON(server_join, ...) \
+    "SELECT" \
+    "  s.subnet_id," \
+    "  s.subnet_prefix," \
+    "  s.client_class," \
+    "  s.interface," \
+    "  gmt_epoch(s.modification_ts) as modification_ts, " \
+    "  s.preferred_lifetime," \
+    "  s.rapid_commit," \
+    "  s.rebind_timer," \
+    "  s.relay," \
+    "  s.renew_timer," \
+    "  s.require_client_classes," \
+    "  s.reservations_global," \
+    "  s.shared_network_name," \
+    "  s.user_context," \
+    "  s.valid_lifetime," \
+    "  p.id," \
+    "  p.start_address," \
+    "  p.end_address," \
+    "  p.subnet_id," \
+    "  gmt_epoch(p.modification_ts) as modification_ts, " \
+    "  d.id," \
+    "  d.prefix," \
+    "  d.prefix_length," \
+    "  d.delegated_prefix_length," \
+    "  d.subnet_id," \
+    "  gmt_epoch(d.modification_ts) as modification_ts, " \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp6_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  gmt_epoch(x.modification_ts) as modification_ts, " \
+    "  x.pd_pool_id," \
+    "  y.option_id," \
+    "  y.code," \
+    "  y.value," \
+    "  y.formatted_value," \
+    "  y.space," \
+    "  y.persistent," \
+    "  y.cancelled," \
+    "  y.dhcp6_subnet_id," \
+    "  y.scope_id," \
+    "  y.user_context," \
+    "  y.shared_network_name," \
+    "  y.pool_id," \
+    "  gmt_epoch(y.modification_ts) as modification_ts, " \
+    "  y.pd_pool_id," \
+    "  o.option_id," \
+    "  o.code," \
+    "  o.value," \
+    "  o.formatted_value," \
+    "  o.space," \
+    "  o.persistent," \
+    "  o.cancelled," \
+    "  o.dhcp6_subnet_id," \
+    "  o.scope_id," \
+    "  o.user_context," \
+    "  o.shared_network_name," \
+    "  o.pool_id," \
+    "  gmt_epoch(o.modification_ts) as modification_ts, " \
+    "  o.pd_pool_id, " \
+    "  s.calculate_tee_times," \
+    "  s.t1_percent," \
+    "  s.t2_percent," \
+    "  s.interface_id," \
+    "  s.min_preferred_lifetime," \
+    "  s.max_preferred_lifetime," \
+    "  s.min_valid_lifetime," \
+    "  s.max_valid_lifetime," \
+    "  p.client_class," \
+    "  p.require_client_classes," \
+    "  p.user_context," \
+    "  d.excluded_prefix," \
+    "  d.excluded_prefix_length," \
+    "  d.client_class," \
+    "  d.require_client_classes," \
+    "  d.user_context," \
+    "  s.ddns_send_updates," \
+    "  s.ddns_override_no_update," \
+    "  s.ddns_override_client_update," \
+    "  s.ddns_replace_client_name," \
+    "  s.ddns_generated_prefix," \
+    "  s.ddns_qualifying_suffix," \
+    "  s.reservations_in_subnet," \
+    "  s.reservations_out_of_pool," \
+    "  s.cache_threshold," \
+    "  s.cache_max_age," \
+    "  s.allocator," \
+    "  s.pd_allocator," \
+    "  srv.tag " \
+    "FROM dhcp6_subnet AS s " \
+    server_join \
+    "LEFT JOIN dhcp6_pool AS p ON s.subnet_id = p.subnet_id " \
+    "LEFT JOIN dhcp6_pd_pool AS d ON s.subnet_id = d.subnet_id " \
+    "LEFT JOIN dhcp6_options AS x ON x.scope_id = 5 AND p.id = x.pool_id " \
+    "LEFT JOIN dhcp6_options AS y ON y.scope_id = 6 AND d.id = y.pd_pool_id " \
+    "LEFT JOIN dhcp6_options AS o ON o.scope_id = 1 AND s.subnet_id = o.dhcp6_subnet_id " \
+    #__VA_ARGS__                                                        \
+    " ORDER BY s.subnet_id, p.id, d.id, x.option_id, y.option_id, o.option_id"
+
+#define PGSQL_GET_SUBNET6_NO_TAG(...) \
+    PGSQL_GET_SUBNET6_COMMON( \
+    "INNER JOIN dhcp6_subnet_server AS a " \
+    "  ON s.subnet_id = a.subnet_id " \
+    "INNER JOIN dhcp6_server AS srv " \
+    "  ON (a.server_id = srv.id) ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_SUBNET6_ANY(...) \
+    PGSQL_GET_SUBNET6_COMMON( \
+    "LEFT JOIN dhcp6_subnet_server AS a "\
+    "  ON s.subnet_id = a.subnet_id " \
+    "LEFT JOIN dhcp6_server AS srv " \
+    "  ON a.server_id = srv.id ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_SUBNET6_UNASSIGNED(...) \
+    PGSQL_GET_SUBNET6_COMMON( \
+    "LEFT JOIN dhcp6_subnet_server AS a "\
+    "  ON s.subnet_id = a.subnet_id " \
+    "LEFT JOIN dhcp6_server AS srv " \
+    "  ON a.server_id = srv.id ", \
+    WHERE a.subnet_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_GET_POOL4_COMMON
+#define PGSQL_GET_POOL4_COMMON(server_join, ...) \
+      "SELECT" \
+      "  p.id," \
+      "  p.start_address," \
+      "  p.end_address," \
+      "  p.subnet_id," \
+      "  p.client_class," \
+      "  p.require_client_classes," \
+      "  p.user_context," \
+      "  gmt_epoch(p.modification_ts) as modification_ts, " \
+      "  x.option_id," \
+      "  x.code," \
+      "  x.value," \
+      "  x.formatted_value," \
+      "  x.space," \
+      "  x.persistent," \
+      "  x.cancelled," \
+      "  x.dhcp4_subnet_id," \
+      "  x.scope_id," \
+      "  x.user_context," \
+      "  x.shared_network_name," \
+      "  x.pool_id," \
+      "  gmt_epoch(x.modification_ts) as modification_ts " \
+      "FROM dhcp4_pool AS p " \
+      server_join \
+      "LEFT JOIN dhcp4_options AS x ON x.scope_id = 5 AND p.id = x.pool_id " \
+      #__VA_ARGS__ \
+      " ORDER BY p.id, x.option_id"
+
+#define PGSQL_GET_POOL4_RANGE_WITH_TAG(...) \
+    PGSQL_GET_POOL4_COMMON( \
+       "INNER JOIN dhcp4_subnet_server AS s ON p.subnet_id = s.subnet_id " \
+       "INNER JOIN dhcp4_server AS srv " \
+       " ON (s.server_id = srv.id) OR (s.server_id = 1) ", \
+       __VA_ARGS__)
+
+#define PGSQL_GET_POOL4_RANGE_NO_TAG(...) \
+    PGSQL_GET_POOL4_COMMON("", __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_GET_POOL6_COMMON
+#define PGSQL_GET_POOL6_COMMON(server_join, ...) \
+    "SELECT" \
+    "  p.id," \
+    "  p.start_address," \
+    "  p.end_address," \
+    "  p.subnet_id," \
+    "  p.client_class," \
+    "  p.require_client_classes," \
+    "  p.user_context," \
+    "  gmt_epoch(p.modification_ts) as modification_ts, " \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp6_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  gmt_epoch(x.modification_ts) as modification_ts, " \
+    "  x.pd_pool_id " \
+    "FROM dhcp6_pool AS p " \
+    server_join \
+    "LEFT JOIN dhcp6_options AS x ON x.scope_id = 5 AND p.id = x.pool_id " \
+    #__VA_ARGS__ \
+    " ORDER BY p.id, x.option_id"
+
+#define PGSQL_GET_POOL6_RANGE_WITH_TAG(...) \
+    PGSQL_GET_POOL6_COMMON( \
+    "INNER JOIN dhcp6_subnet_server AS s ON p.subnet_id = s.subnet_id " \
+    "INNER JOIN dhcp6_server AS srv " \
+    " ON (s.server_id = srv.id) OR (s.server_id = 1) ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_POOL6_RANGE_NO_TAG(...) \
+    PGSQL_GET_POOL6_COMMON("", __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_GET_PD_POOL_COMMON
+#define PGSQL_GET_PD_POOL_COMMON(server_join, ...) \
+    "SELECT" \
+    "  p.id," \
+    "  p.prefix," \
+    "  p.prefix_length," \
+    "  p.delegated_prefix_length," \
+    "  p.subnet_id," \
+    "  p.excluded_prefix," \
+    "  p.excluded_prefix_length," \
+    "  p.client_class," \
+    "  p.require_client_classes," \
+    "  p.user_context," \
+    "  gmt_epoch(p.modification_ts) as modification_ts, " \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp6_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  gmt_epoch(x.modification_ts) as modification_ts, " \
+    "  x.pd_pool_id " \
+    "FROM dhcp6_pd_pool AS p " \
+    server_join \
+    "LEFT JOIN dhcp6_options AS x ON x.scope_id = 6 AND p.id = x.pd_pool_id " \
+    #__VA_ARGS__ \
+    " ORDER BY p.id, x.option_id" \
+
+#define PGSQL_GET_PD_POOL_WITH_TAG(...) \
+    PGSQL_GET_PD_POOL_COMMON( \
+    "INNER JOIN dhcp6_subnet_server AS s ON p.subnet_id = s.subnet_id " \
+    "INNER JOIN dhcp6_server AS srv " \
+    " ON (s.server_id = srv.id) OR (s.server_id = 1) ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_PD_POOL_NO_TAG(...) \
+    PGSQL_GET_PD_POOL_COMMON("", __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_GET_SHARED_NETWORK4
+#define PGSQL_GET_SHARED_NETWORK4_COMMON(server_join, ...) \
+    "SELECT" \
+    "  n.id," \
+    "  n.name," \
+    "  n.client_class," \
+    "  n.interface," \
+    "  n.match_client_id," \
+    "  gmt_epoch(n.modification_ts) as modification_ts, " \
+    "  n.rebind_timer," \
+    "  n.relay," \
+    "  n.renew_timer," \
+    "  n.require_client_classes," \
+    "  n.reservations_global," \
+    "  n.user_context," \
+    "  n.valid_lifetime," \
+    "  o.option_id," \
+    "  o.code," \
+    "  o.value," \
+    "  o.formatted_value," \
+    "  o.space," \
+    "  o.persistent," \
+    "  o.cancelled," \
+    "  o.dhcp4_subnet_id," \
+    "  o.scope_id," \
+    "  o.user_context," \
+    "  o.shared_network_name," \
+    "  o.pool_id," \
+    "  gmt_epoch(o.modification_ts) as modification_ts, " \
+    "  n.calculate_tee_times," \
+    "  n.t1_percent," \
+    "  n.t2_percent," \
+    "  n.authoritative," \
+    "  n.boot_file_name," \
+    "  n.next_server," \
+    "  n.server_hostname," \
+    "  n.min_valid_lifetime," \
+    "  n.max_valid_lifetime," \
+    "  n.ddns_send_updates," \
+    "  n.ddns_override_no_update," \
+    "  n.ddns_override_client_update," \
+    "  n.ddns_replace_client_name," \
+    "  n.ddns_generated_prefix," \
+    "  n.ddns_qualifying_suffix," \
+    "  n.reservations_in_subnet," \
+    "  n.reservations_out_of_pool," \
+    "  n.cache_threshold," \
+    "  n.cache_max_age," \
+    "  n.offer_lifetime," \
+    "  n.allocator," \
+    "  s.tag " \
+    "FROM dhcp4_shared_network AS n " \
+    server_join \
+    "LEFT JOIN dhcp4_options AS o ON o.scope_id = 4 AND n.name = o.shared_network_name " \
+    #__VA_ARGS__ \
+    " ORDER BY n.id, s.id, o.option_id"
+
+#define PGSQL_GET_SHARED_NETWORK4_NO_TAG(...) \
+    PGSQL_GET_SHARED_NETWORK4_COMMON( \
+    "INNER JOIN dhcp4_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "INNER JOIN dhcp4_server AS s " \
+    "  ON (a.server_id = s.id) ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_SHARED_NETWORK4_ANY(...) \
+    PGSQL_GET_SHARED_NETWORK4_COMMON( \
+    "LEFT JOIN dhcp4_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "LEFT JOIN dhcp4_server AS s " \
+    "  ON a.server_id = s.id ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_SHARED_NETWORK4_UNASSIGNED(...) \
+    PGSQL_GET_SHARED_NETWORK4_COMMON( \
+    "LEFT JOIN dhcp4_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "LEFT JOIN dhcp4_server AS s " \
+    "  ON a.server_id = s.id ", \
+    WHERE a.shared_network_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_GET_SHARED_NETWORK6
+#define PGSQL_GET_SHARED_NETWORK6_COMMON(server_join, ...) \
+    "SELECT" \
+    "  n.id," \
+    "  n.name," \
+    "  n.client_class," \
+    "  n.interface," \
+    "  gmt_epoch(n.modification_ts) as modification_ts, " \
+    "  n.preferred_lifetime," \
+    "  n.rapid_commit," \
+    "  n.rebind_timer," \
+    "  n.relay," \
+    "  n.renew_timer," \
+    "  n.require_client_classes," \
+    "  n.reservations_global," \
+    "  n.user_context," \
+    "  n.valid_lifetime," \
+    "  o.option_id," \
+    "  o.code," \
+    "  o.value," \
+    "  o.formatted_value," \
+    "  o.space," \
+    "  o.persistent," \
+    "  o.cancelled," \
+    "  o.dhcp6_subnet_id," \
+    "  o.scope_id," \
+    "  o.user_context," \
+    "  o.shared_network_name," \
+    "  o.pool_id," \
+    "  gmt_epoch(o.modification_ts) as modification_ts, " \
+    "  o.pd_pool_id, " \
+    "  n.calculate_tee_times," \
+    "  n.t1_percent," \
+    "  n.t2_percent," \
+    "  n.interface_id," \
+    "  n.min_preferred_lifetime," \
+    "  n.max_preferred_lifetime," \
+    "  n.min_valid_lifetime," \
+    "  n.max_valid_lifetime," \
+    "  n.ddns_send_updates," \
+    "  n.ddns_override_no_update," \
+    "  n.ddns_override_client_update," \
+    "  n.ddns_replace_client_name," \
+    "  n.ddns_generated_prefix," \
+    "  n.ddns_qualifying_suffix," \
+    "  n.reservations_in_subnet," \
+    "  n.reservations_out_of_pool," \
+    "  n.cache_threshold," \
+    "  n.cache_max_age," \
+    "  n.allocator," \
+    "  n.pd_allocator," \
+    "  s.tag " \
+    "FROM dhcp6_shared_network AS n " \
+    server_join \
+    "LEFT JOIN dhcp6_options AS o ON o.scope_id = 4 AND n.name = o.shared_network_name " \
+    #__VA_ARGS__ \
+    " ORDER BY n.id, s.id, o.option_id"
+
+#define PGSQL_GET_SHARED_NETWORK6_NO_TAG(...) \
+    PGSQL_GET_SHARED_NETWORK6_COMMON( \
+    "INNER JOIN dhcp6_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "INNER JOIN dhcp6_server AS s " \
+    "  ON (a.server_id = s.id) ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_SHARED_NETWORK6_ANY(...) \
+    PGSQL_GET_SHARED_NETWORK6_COMMON( \
+    "LEFT JOIN dhcp6_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "LEFT JOIN dhcp6_server AS s " \
+    "  ON a.server_id = s.id ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_SHARED_NETWORK6_UNASSIGNED(...) \
+    PGSQL_GET_SHARED_NETWORK6_COMMON( \
+    "LEFT JOIN dhcp6_shared_network_server AS a " \
+    "  ON n.id = a.shared_network_id " \
+    "LEFT JOIN dhcp6_server AS s " \
+    "  ON a.server_id = s.id ", \
+    WHERE a.shared_network_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_GET_OPTION_DEF
+#define PGSQL_GET_OPTION_DEF(table_prefix, ...) \
+    "SELECT" \
+    "  d.id," \
+    "  d.code," \
+    "  d.name," \
+    "  d.space," \
+    "  d.type," \
+    "  gmt_epoch(d.modification_ts) as modification_ts, " \
+    "  d.is_array," \
+    "  d.encapsulate," \
+    "  d.record_types," \
+    "  d.user_context," \
+    "  s.tag " \
+    "FROM " #table_prefix "_option_def AS d " \
+    "INNER JOIN " #table_prefix "_option_def_server AS a" \
+    "  ON d.id = a.option_def_id " \
+    "INNER JOIN " #table_prefix "_server AS s " \
+    "  ON a.server_id = s.id " \
+    "WHERE (s.tag = $1 OR s.id = 1) " #__VA_ARGS__ \
+    " ORDER BY d.id"
+#endif
+
+#ifndef PGSQL_GET_OPTION_COMMON
+#define PGSQL_GET_OPTION_COMMON(table_prefix, pd_pool_id, ...) \
+    "SELECT" \
+    "  o.option_id," \
+    "  o.code," \
+    "  o.value," \
+    "  o.formatted_value," \
+    "  o.space," \
+    "  o.persistent," \
+    "  o.cancelled," \
+    "  o." #table_prefix "_subnet_id," \
+    "  o.scope_id," \
+    "  o.user_context," \
+    "  o.shared_network_name," \
+    "  o.pool_id," \
+    "  gmt_epoch(o.modification_ts) as modification_ts, " \
+    "  s.tag " \
+    pd_pool_id \
+    "FROM " #table_prefix "_options AS o " \
+    "INNER JOIN " #table_prefix "_options_server AS a" \
+    "  ON o.option_id = a.option_id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON a.server_id = s.id " \
+    "WHERE (s.tag = $1 OR s.id = 1) " #__VA_ARGS__ \
+    " ORDER BY o.option_id, s.id"
+
+#define PGSQL_GET_OPTION4(...) \
+    PGSQL_GET_OPTION_COMMON(dhcp4, "", __VA_ARGS__)
+
+#define PGSQL_GET_OPTION6(...) \
+    PGSQL_GET_OPTION_COMMON(dhcp6, ", o.pd_pool_id ", __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_GET_AUDIT_ENTRIES_TIME
+#define PGSQL_GET_AUDIT_ENTRIES_TIME(table_prefix) \
+    "SELECT" \
+    "  a.id," \
+    "  a.object_type," \
+    "  a.object_id," \
+    "  a.modification_type," \
+    "  gmt_epoch(r.modification_ts) as modification_ts, " \
+    "  r.id, " \
+    "  r.log_message " \
+    "FROM " #table_prefix "_audit AS a " \
+    "INNER JOIN " #table_prefix "_audit_revision AS r " \
+    "  ON a.revision_id = r.id " \
+    "INNER JOIN " #table_prefix "_server AS s" \
+    "  ON r.server_id = s.id " \
+    "WHERE (s.tag = $1 OR s.id = 1) AND ((r.modification_ts, r.id) > (cast($2 as timestamp), $3))" \
+    " ORDER BY r.modification_ts, r.id, a.id"
+#endif
+
+#ifndef PGSQL_GET_SERVERS_COMMON
+#define PGSQL_GET_SERVERS_COMMON(table_prefix, ...) \
+    "SELECT" \
+    "  s.id," \
+    "  s.tag," \
+    "  s.description," \
+    "  gmt_epoch(s.modification_ts) as modification_ts " \
+    "FROM " #table_prefix "_server AS s " \
+    "WHERE s.id > 1 " \
+    __VA_ARGS__ \
+    " ORDER BY s.id"
+
+#define PGSQL_GET_ALL_SERVERS(table_prefix) \
+    PGSQL_GET_SERVERS_COMMON(table_prefix, "")
+
+#define PGSQL_GET_SERVER(table_prefix) \
+    PGSQL_GET_SERVERS_COMMON(table_prefix, " AND s.tag = $1")
+#endif
+
+#ifndef PGSQL_GET_CLIENT_CLASS4_COMMON
+#define PGSQL_GET_CLIENT_CLASS4_COMMON(server_join, ...) \
+    "SELECT " \
+    "  c.id," \
+    "  c.name," \
+    "  c.test," \
+    "  c.next_server," \
+    "  c.server_hostname," \
+    "  c.boot_file_name," \
+    "  c.only_if_required," \
+    "  c.valid_lifetime," \
+    "  c.min_valid_lifetime," \
+    "  c.max_valid_lifetime," \
+    "  c.depend_on_known_directly," \
+    "  o.depend_on_known_indirectly, " \
+    "  gmt_epoch(c.modification_ts) as modification_ts, " \
+    "  c.user_context," \
+    "  c.offer_lifetime," \
+    "  d.id," \
+    "  d.code," \
+    "  d.name," \
+    "  d.space," \
+    "  d.type," \
+    "  gmt_epoch(d.modification_ts) as modification_ts, " \
+    "  d.is_array," \
+    "  d.encapsulate," \
+    "  d.record_types," \
+    "  d.user_context," \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp4_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  gmt_epoch(x.modification_ts) as modification_ts, " \
+    "  s.tag " \
+    "FROM dhcp4_client_class AS c " \
+    "INNER JOIN dhcp4_client_class_order AS o " \
+    "  ON c.id = o.class_id " \
+    server_join \
+    "LEFT JOIN dhcp4_option_def AS d ON c.id = d.class_id " \
+    "LEFT JOIN dhcp4_options AS x ON x.scope_id = 2 AND c.name = x.dhcp_client_class " \
+    #__VA_ARGS__ \
+    "  ORDER BY o.order_index, d.id, x.option_id"
+
+#define PGSQL_GET_CLIENT_CLASS4_WITH_TAG(...) \
+    PGSQL_GET_CLIENT_CLASS4_COMMON( \
+    "INNER JOIN dhcp4_client_class_server AS a " \
+    "  ON c.id = a.class_id " \
+    "INNER JOIN dhcp4_server AS s " \
+    "  ON a.server_id = s.id ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_CLIENT_CLASS4_UNASSIGNED(...) \
+    PGSQL_GET_CLIENT_CLASS4_COMMON( \
+    "LEFT JOIN dhcp4_client_class_server AS a " \
+    "  ON c.id = a.class_id " \
+    "LEFT JOIN dhcp4_server AS s " \
+    "  ON a.server_id = s.id ", \
+    WHERE a.class_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_GET_CLIENT_CLASS6_COMMON
+#define PGSQL_GET_CLIENT_CLASS6_COMMON(server_join, ...) \
+    "SELECT " \
+    "  c.id," \
+    "  c.name," \
+    "  c.test," \
+    "  c.only_if_required," \
+    "  c.valid_lifetime," \
+    "  c.min_valid_lifetime," \
+    "  c.max_valid_lifetime," \
+    "  c.depend_on_known_directly," \
+    "  o.depend_on_known_indirectly, " \
+    "  gmt_epoch(c.modification_ts) as modification_ts, " \
+    "  c.user_context, " \
+    "  d.id," \
+    "  d.code," \
+    "  d.name," \
+    "  d.space," \
+    "  d.type," \
+    "  gmt_epoch(d.modification_ts) as modification_ts, " \
+    "  d.is_array," \
+    "  d.encapsulate," \
+    "  d.record_types," \
+    "  d.user_context," \
+    "  x.option_id," \
+    "  x.code," \
+    "  x.value," \
+    "  x.formatted_value," \
+    "  x.space," \
+    "  x.persistent," \
+    "  x.cancelled," \
+    "  x.dhcp6_subnet_id," \
+    "  x.scope_id," \
+    "  x.user_context," \
+    "  x.shared_network_name," \
+    "  x.pool_id," \
+    "  gmt_epoch(x.modification_ts) as modification_ts, " \
+    "  s.tag, " \
+    "  c.preferred_lifetime," \
+    "  c.min_preferred_lifetime, " \
+    "  c.max_preferred_lifetime " \
+    "FROM dhcp6_client_class AS c " \
+    "INNER JOIN dhcp6_client_class_order AS o " \
+    "  ON c.id = o.class_id " \
+    server_join \
+    "LEFT JOIN dhcp6_option_def AS d ON c.id = d.class_id " \
+    "LEFT JOIN dhcp6_options AS x ON x.scope_id = 2 AND c.name = x.dhcp_client_class " \
+    #__VA_ARGS__ \
+    "  ORDER BY o.order_index, d.id, x.option_id"
+
+#define PGSQL_GET_CLIENT_CLASS6_WITH_TAG(...) \
+    PGSQL_GET_CLIENT_CLASS6_COMMON( \
+    "INNER JOIN dhcp6_client_class_server AS a " \
+    "  ON c.id = a.class_id " \
+    "INNER JOIN dhcp6_server AS s " \
+    "  ON a.server_id = s.id ", \
+    __VA_ARGS__)
+
+#define PGSQL_GET_CLIENT_CLASS6_UNASSIGNED(...) \
+    PGSQL_GET_CLIENT_CLASS6_COMMON( \
+    "LEFT JOIN dhcp6_client_class_server AS a " \
+    "  ON c.id = a.class_id " \
+    "LEFT JOIN dhcp6_server AS s " \
+    "  ON a.server_id = s.id ", \
+    WHERE a.class_id IS NULL __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_INSERT_GLOBAL_PARAMETER
+#define PGSQL_INSERT_GLOBAL_PARAMETER(table_prefix) \
+    "INSERT INTO " #table_prefix "_global_parameter(" \
+    "  name," \
+    "  value," \
+    "  parameter_type," \
+    "  modification_ts" \
+    ") VALUES ($1, $2, $3, $4)"
+#endif
+
+#ifndef PGSQL_INSERT_GLOBAL_PARAMETER_SERVER
+#define PGSQL_INSERT_GLOBAL_PARAMETER_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_global_parameter_server(" \
+    "  parameter_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES ($1, $2, (SELECT id FROM " #table_prefix "_server WHERE tag = $3))"
+#endif
+
+#ifndef PGSQL_INSERT_SUBNET_SERVER
+#define PGSQL_INSERT_SUBNET_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_subnet_server(" \
+    "  subnet_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES ($1, $2, (SELECT id FROM " #table_prefix "_server WHERE tag = $3))"
+#endif
+
+#ifndef PGSQL_INSERT_POOL
+#define PGSQL_INSERT_POOL(table_prefix) \
+    "INSERT INTO " #table_prefix "_pool(" \
+    "  start_address," \
+    "  end_address," \
+    "  subnet_id," \
+    "  client_class," \
+    "  require_client_classes," \
+    "  user_context," \
+    "  modification_ts" \
+    ") VALUES (cast($1 as inet), cast($2 as inet), $3, $4, $5, cast($6 as json), $7)"
+#endif
+
+#ifndef PGSQL_INSERT_PD_POOL
+#define PGSQL_INSERT_PD_POOL() \
+    "INSERT INTO dhcp6_pd_pool(" \
+    "  prefix," \
+    "  prefix_length," \
+    "  delegated_prefix_length," \
+    "  subnet_id," \
+    "  excluded_prefix," \
+    "  excluded_prefix_length," \
+    "  client_class," \
+    "  require_client_classes," \
+    "  user_context," \
+    "  modification_ts" \
+    ") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, cast($9 as json), $10)"
+#endif
+
+#ifndef PGSQL_INSERT_SHARED_NETWORK_SERVER
+#define PGSQL_INSERT_SHARED_NETWORK_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_shared_network_server(" \
+    "  shared_network_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES (" \
+    "    (SELECT id FROM " #table_prefix "_shared_network WHERE name = $1), $2," \
+    "    (SELECT id FROM " #table_prefix "_server WHERE tag = $3)" \
+    ")"
+#endif
+
+#ifndef PGSQL_INSERT_OPTION_DEF
+#define PGSQL_INSERT_OPTION_DEF(table_prefix) \
+    "INSERT INTO " #table_prefix "_option_def (" \
+    "  code," \
+    "  name," \
+    "  space," \
+    "  type," \
+    "  modification_ts," \
+    "  is_array," \
+    "  encapsulate," \
+    "  record_types," \
+    "  user_context," \
+    "  class_id" \
+    ") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, cast($9 as json), $10)"
+#endif
+
+#ifndef PGSQL_INSERT_OPTION_DEF_CLIENT_CLASS
+#define PGSQL_INSERT_OPTION_DEF_CLIENT_CLASS(table_prefix) \
+    "INSERT INTO " #table_prefix "_option_def (" \
+    "  code," \
+    "  name," \
+    "  space," \
+    "  type," \
+    "  modification_ts," \
+    "  is_array," \
+    "  encapsulate," \
+    "  record_types," \
+    "  user_context," \
+    "  class_id" \
+    ") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, cast($9 as json), " \
+    "          (SELECT id FROM " #table_prefix "_client_class WHERE name = $10))"
+#endif
+
+#ifndef PGSQL_INSERT_OPTION_DEF_SERVER
+#define PGSQL_INSERT_OPTION_DEF_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_option_def_server(" \
+    "  option_def_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES ($1, $2, (SELECT id FROM " #table_prefix "_server WHERE tag = $3))"
+#endif
+
+#ifndef PGSQL_INSERT_OPTION_COMMON
+#define PGSQL_INSERT_OPTION_COMMON(table_prefix, pd_pool_id, last) \
+    "INSERT INTO " #table_prefix "_options (" \
+    "  code," \
+    "  value," \
+    "  formatted_value," \
+    "  space," \
+    "  persistent," \
+    "  cancelled," \
+    "  dhcp_client_class," \
+    " " #table_prefix "_subnet_id," \
+    "  scope_id," \
+    "  user_context," \
+    "  shared_network_name," \
+    "  pool_id," \
+    "  modification_ts" \
+    pd_pool_id \
+    ") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, cast($10 as json), $11, $12, $13" last ")"
+
+#define PGSQL_INSERT_OPTION4() \
+    PGSQL_INSERT_OPTION_COMMON(dhcp4, "", "")
+
+#define PGSQL_INSERT_OPTION6() \
+    PGSQL_INSERT_OPTION_COMMON(dhcp6, ", pd_pool_id ", ", $14")
+#endif
+
+#ifndef PGSQL_INSERT_OPTION_SERVER
+#define PGSQL_INSERT_OPTION_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_options_server (" \
+    "  option_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES ($1, $2, (SELECT id FROM " #table_prefix "_server WHERE tag = $3))"
+#endif
+
+#ifndef PGSQL_INSERT_CLIENT_CLASS_SERVER
+#define PGSQL_INSERT_CLIENT_CLASS_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_client_class_server (" \
+    "  class_id," \
+    "  modification_ts," \
+    "  server_id" \
+    ") VALUES ((SELECT id FROM " #table_prefix "_client_class WHERE name = $1), $2," \
+    "          (SELECT id FROM " #table_prefix "_server WHERE tag = $3))"
+#endif
+
+#ifndef PGSQL_INSERT_CLIENT_CLASS_DEPENDENCY
+#define PGSQL_INSERT_CLIENT_CLASS_DEPENDENCY(table_prefix) \
+    "INSERT INTO " #table_prefix "_client_class_dependency (" \
+    "  class_id," \
+    "  dependency_id" \
+    ") VALUES ((SELECT id FROM " #table_prefix "_client_class WHERE name = $1), " \
+    "          (SELECT id FROM " #table_prefix "_client_class WHERE name = $2))"
+#endif
+
+#ifndef PGSQL_INSERT_SERVER
+#define PGSQL_INSERT_SERVER(table_prefix) \
+    "INSERT INTO " #table_prefix "_server (" \
+    "  tag," \
+    "  description," \
+    "  modification_ts" \
+    ") VALUES ($1, $2, $3)"
+#endif
+
+#ifndef PGSQL_UPDATE_GLOBAL_PARAMETER
+#define PGSQL_UPDATE_GLOBAL_PARAMETER(table_prefix) \
+    "UPDATE " #table_prefix "_global_parameter AS g " \
+    "SET " \
+    "    name = $1, " \
+    "    value = $2, " \
+    "    parameter_type = $3, " \
+    "    modification_ts = $4 " \
+    "FROM " #table_prefix "_global_parameter_server as a, " \
+    "     " #table_prefix "_server as s " \
+    "WHERE g.id = a.parameter_id AND " \
+    "      a.server_id = s.id AND " \
+    "      s.tag = $5 AND g.name = $6"
+#endif
+
+#ifndef PGSQL_UPDATE_OPTION_DEF
+#define PGSQL_UPDATE_OPTION_DEF(table_prefix) \
+    "UPDATE " #table_prefix "_option_def AS d " \
+    "SET" \
+    "  code = $1," \
+    "  name = $2," \
+    "  space = $3," \
+    "  type = $4," \
+    "  modification_ts = $5," \
+    "  is_array = $6," \
+    "  encapsulate = $7," \
+    "  record_types = $8," \
+    "  user_context = cast($9 as json), " \
+    "  class_id = $10 " \
+    "FROM " #table_prefix "_option_def_server as a, " \
+    "     " #table_prefix "_server as s " \
+    "WHERE d.id = a.option_def_id AND" \
+    "      a.server_id = s.id AND " \
+    "      s.tag = $11 AND d.code = $12 AND d.space = $13"
+#endif
+
+#ifndef PGSQL_UPDATE_OPTION_DEF_CLIENT_CLASS
+#define PGSQL_UPDATE_OPTION_DEF_CLIENT_CLASS(table_prefix) \
+    "UPDATE " #table_prefix "_option_def AS d " \
+    "SET" \
+    "  code = $1," \
+    "  name = $2," \
+    "  space = $3," \
+    "  type = $4," \
+    "  modification_ts = $5," \
+    "  is_array = $6," \
+    "  encapsulate = $7," \
+    "  record_types = $8," \
+    "  user_context = cast($9 as json) " \
+    "FROM " #table_prefix "_option_def_server as a, " \
+    "     " #table_prefix "_server as s " \
+    "WHERE d.id = a.option_def_id AND " \
+    "      a.server_id = s.id AND " \
+    "      d.class_id = (SELECT id FROM " #table_prefix "_client_class WHERE name = $10) " \
+    "      AND s.tag = $11 AND d.code = $12 AND d.space = $13"
+#endif
+
+#ifndef PGSQL_UPDATE_OPTION_NO_TAG
+#define PGSQL_UPDATE_OPTION_NO_TAG(table_prefix, pd_pool_id, ...) \
+    "UPDATE " #table_prefix "_options AS o " \
+    "SET" \
+    "  code = $1," \
+    "  value = $2," \
+    "  formatted_value = $3," \
+    "  space = $4," \
+    "  persistent = $5," \
+    "  cancelled = $6," \
+    "  dhcp_client_class = $7," \
+    "  " #table_prefix "_subnet_id = $8," \
+    "  scope_id = $9," \
+    "  user_context = cast($10 as json)," \
+    "  shared_network_name = $11," \
+    "  pool_id = $12," \
+    "  modification_ts = $13 " \
+    pd_pool_id \
+    "WHERE " #__VA_ARGS__
+
+#define PGSQL_UPDATE_OPTION4_NO_TAG(...) \
+    PGSQL_UPDATE_OPTION_NO_TAG(dhcp4, "", __VA_ARGS__)
+
+#define PGSQL_UPDATE_OPTION6_NO_TAG(...) \
+    PGSQL_UPDATE_OPTION_NO_TAG(dhcp6, ", pd_pool_id = $14 ", __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_UPDATE_OPTION_WITH_TAG
+#define PGSQL_UPDATE_OPTION_WITH_TAG(table_prefix, pd_pool_id, ...) \
+    "UPDATE " #table_prefix "_options AS o " \
+    "SET" \
+    "  code = $1," \
+    "  value = $2," \
+    "  formatted_value = $3," \
+    "  space = $4," \
+    "  persistent = $5," \
+    "  cancelled = $6," \
+    "  dhcp_client_class = $7," \
+    "  " #table_prefix "_subnet_id = $8," \
+    "  scope_id = $9," \
+    "  user_context = cast($10 as json)," \
+    "  shared_network_name = $11," \
+    "  pool_id = $12," \
+    "  modification_ts = $13 " \
+    pd_pool_id \
+    "FROM " #table_prefix "_options_server as a, " \
+    "     " #table_prefix "_server as s " \
+    "WHERE o.option_id = a.option_id AND " \
+    "      a.server_id = s.id " \
+    #__VA_ARGS__
+
+#define PGSQL_UPDATE_OPTION4_WITH_TAG(...) \
+    PGSQL_UPDATE_OPTION_WITH_TAG(dhcp4, "", AND s.tag = $14 __VA_ARGS__)
+
+#define PGSQL_UPDATE_OPTION6_WITH_TAG(...) \
+    PGSQL_UPDATE_OPTION_WITH_TAG(dhcp6, \
+    ", pd_pool_id = $14 ", AND s.tag = $15 __VA_ARGS__)
+#endif
+
+#ifndef PGSQL_UPDATE_CLIENT_CLASS4
+#define PGSQL_UPDATE_CLIENT_CLASS4(follow_class_name_set) \
+    "UPDATE dhcp4_client_class SET" \
+    "  name = $1," \
+    "  test = $2," \
+    "  next_server = cast($3 as inet)," \
+    "  server_hostname = $4," \
+    "  boot_file_name = $5," \
+    "  only_if_required = $6," \
+    "  valid_lifetime = $7," \
+    "  min_valid_lifetime = $8," \
+    "  max_valid_lifetime = $9," \
+    "  depend_on_known_directly = $10," \
+    follow_class_name_set \
+    "  modification_ts = $12, " \
+    "  user_context = cast($13 as json), " \
+    "  offer_lifetime = $14 " \
+    "WHERE name = $15"
+#endif
+
+#ifndef PGSQL_UPDATE_CLIENT_CLASS6
+#define PGSQL_UPDATE_CLIENT_CLASS6(follow_class_name_set) \
+    "UPDATE dhcp6_client_class SET" \
+    "  name = $1," \
+    "  test = $2," \
+    "  only_if_required = $3," \
+    "  valid_lifetime = $4," \
+    "  min_valid_lifetime = $5," \
+    "  max_valid_lifetime = $6," \
+    "  depend_on_known_directly = $7," \
+    follow_class_name_set \
+    "  preferred_lifetime = $9, " \
+    "  min_preferred_lifetime = $10, " \
+    "  max_preferred_lifetime = $11, " \
+    "  modification_ts = $12, " \
+    "  user_context = cast($13 as json) " \
+    "WHERE name = $14"
+#endif
+
+#ifndef PGSQL_UPDATE_SERVER
+#define PGSQL_UPDATE_SERVER(table_prefix) \
+    "UPDATE " #table_prefix "_server " \
+    "SET" \
+    "  tag = $1," \
+    "  description = $2," \
+    "  modification_ts = $3 " \
+    "WHERE tag = $4"
+#endif
+
+#ifndef PGSQL_DELETE_GLOBAL_PARAMETER
+#define PGSQL_DELETE_GLOBAL_PARAMETER(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_global_parameter AS g " \
+    "USING " \
+    "   " #table_prefix "_global_parameter_server AS a, " \
+    "   " #table_prefix "_server AS s " \
+    "WHERE " \
+    "   g.id = a.parameter_id AND " \
+    "   a.server_id = s.id AND " \
+    "   s.tag = $1 " #__VA_ARGS__
+#endif
+
+#ifndef PGSQL_DELETE_GLOBAL_PARAMETER_UNASSIGNED
+#define PGSQL_DELETE_GLOBAL_PARAMETER_UNASSIGNED(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_global_parameter AS g " \
+    "WHERE g.id in ( " \
+    "   SELECT g.id FROM " #table_prefix "_global_parameter AS g " \
+    "   LEFT JOIN " #table_prefix "_global_parameter_server AS a ON g.id = a.parameter_id " \
+    "   WHERE a.parameter_id IS NULL) " #__VA_ARGS__
+#endif
+
+#ifndef PGSQL_DELETE_SUBNET_COMMON
+#define PGSQL_DELETE_SUBNET_COMMON(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_subnet AS s " \
+    "USING " \
+    "   " #table_prefix "_subnet_server AS a, " \
+    "   " #table_prefix "_server AS srv " \
+    "WHERE " \
+    "   s.subnet_id = a.subnet_id AND " \
+    "   a.server_id = srv.id " \
+    #__VA_ARGS__
+
+#define PGSQL_DELETE_SUBNET_WITH_TAG(table_prefix, ...) \
+    PGSQL_DELETE_SUBNET_COMMON(table_prefix, AND srv.tag = $1 __VA_ARGS__)
+
+#define PGSQL_DELETE_SUBNET_ANY(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_subnet AS s " \
+    #__VA_ARGS__
+
+#define PGSQL_DELETE_SUBNET_UNASSIGNED(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_subnet AS s " \
+    "WHERE s.subnet_id in ( " \
+    "   SELECT s.subnet_id FROM " #table_prefix "_subnet AS s " \
+    "   LEFT JOIN " #table_prefix "_subnet_server AS a ON s.subnet_id = a.subnet_id " \
+    "   WHERE a.subnet_id IS NULL) " #__VA_ARGS__
+#endif
+
+#ifndef PGSQL_DELETE_SUBNET_SERVER
+#define PGSQL_DELETE_SUBNET_SERVER(table_prefix) \
+    "DELETE FROM " #table_prefix "_subnet_server " \
+    "WHERE subnet_id = $1"
+#endif
+
+#ifndef PGSQL_DELETE_POOLS
+#define PGSQL_DELETE_POOLS(table_prefix) \
+    "DELETE FROM " #table_prefix "_pool " \
+    "WHERE subnet_id = $1 OR subnet_id = " \
+    "(SELECT subnet_id FROM " #table_prefix "_subnet" \
+    "    WHERE subnet_prefix = $2)"
+#endif
+
+#ifndef PGSQL_DELETE_PD_POOLS
+#define PGSQL_DELETE_PD_POOLS() \
+    "DELETE FROM dhcp6_pd_pool " \
+    "WHERE subnet_id = $1 OR subnet_id = " \
+    "(SELECT subnet_id FROM dhcp6_subnet" \
+    "    WHERE subnet_prefix = $2)"
+#endif
+
+#ifndef PGSQL_DELETE_SHARED_NETWORK_COMMON
+#define PGSQL_DELETE_SHARED_NETWORK_COMMON(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_shared_network AS n " \
+    "USING " \
+    "   " #table_prefix "_shared_network_server AS a, " \
+    "   " #table_prefix "_server AS s " \
+    "WHERE " \
+    "   n.id = a.shared_network_id AND " \
+    "   a.server_id = s.id " \
+    #__VA_ARGS__
+
+#define PGSQL_DELETE_SHARED_NETWORK_WITH_TAG(table_prefix, ...) \
+    PGSQL_DELETE_SHARED_NETWORK_COMMON(table_prefix, AND s.tag = $1 __VA_ARGS__)
+
+#define PGSQL_DELETE_SHARED_NETWORK_ANY(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_shared_network AS n " \
+    #__VA_ARGS__
+
+#define PGSQL_DELETE_SHARED_NETWORK_UNASSIGNED(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_shared_network AS n " \
+    "WHERE n.id in ( " \
+    "   SELECT n.id FROM " #table_prefix "_shared_network AS n " \
+    "   LEFT JOIN " #table_prefix "_shared_network_server AS a ON n.id = a.shared_network_id " \
+    "   WHERE a.shared_network_id IS NULL) " \
+    #__VA_ARGS__
+#endif
+
+#ifndef PGSQL_DELETE_SHARED_NETWORK_SERVER
+#define PGSQL_DELETE_SHARED_NETWORK_SERVER(table_prefix) \
+    "DELETE FROM " #table_prefix "_shared_network_server " \
+    "WHERE shared_network_id = " \
+    "(SELECT id FROM " #table_prefix "_shared_network WHERE name = $1)"
+#endif
+
+#ifndef PGSQL_DELETE_OPTION_DEF
+#define PGSQL_DELETE_OPTION_DEF(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_option_def AS d " \
+    "USING " \
+    "   " #table_prefix "_option_def_server AS a, " \
+    "   " #table_prefix "_server AS s " \
+    "WHERE " \
+    "   d.id = a.option_def_id AND " \
+    "   a.server_id = s.id AND " \
+    "   s.tag = $1 " #__VA_ARGS__
+#endif
+
+#ifndef PGSQL_DELETE_OPTION_DEF_UNASSIGNED
+#define PGSQL_DELETE_OPTION_DEF_UNASSIGNED(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_option_def AS d " \
+    "WHERE d.id in ( " \
+    "   SELECT d.id FROM " #table_prefix "_option_def AS d " \
+    "   LEFT JOIN " #table_prefix "_option_def_server AS a ON d.id = a.option_def_id " \
+    "   WHERE a.option_def_id IS NULL) " #__VA_ARGS__
+#endif
+
+#ifndef PGSQL_DELETE_OPTION_DEFS_CLIENT_CLASS
+#define PGSQL_DELETE_OPTION_DEFS_CLIENT_CLASS(table_prefix) \
+    "DELETE FROM " #table_prefix "_option_def " \
+    "WHERE class_id = (SELECT id FROM " #table_prefix "_client_class WHERE name = $1)"
+#endif
+
+#ifndef PGSQL_DELETE_OPTION_WITH_TAG
+#define PGSQL_DELETE_OPTION_WITH_TAG(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_options AS o " \
+    "USING " \
+    "   " #table_prefix "_options_server AS a, " \
+    "   " #table_prefix "_server AS s " \
+    "WHERE " \
+    "   o.option_id = a.option_id AND " \
+    "   a.server_id = s.id AND " \
+    "   s.tag = $1 " #__VA_ARGS__
+#endif
+
+#ifndef PGSQL_DELETE_OPTION_NO_TAG
+#define PGSQL_DELETE_OPTION_NO_TAG(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_options AS o " \
+    #__VA_ARGS__
+#endif
+
+#ifndef PGSQL_DELETE_OPTION_SUBNET_ID_PREFIX
+#define PGSQL_DELETE_OPTION_SUBNET_ID_PREFIX(table_prefix) \
+    "DELETE FROM " #table_prefix "_options AS o " \
+    "USING " \
+    "   " #table_prefix "_subnet AS s " \
+    "WHERE " \
+    "   s.subnet_id = o." #table_prefix "_subnet_id AND " \
+    "   o.scope_id = 1 AND (s.subnet_id = $1 OR s.subnet_prefix = $2)"
+#endif
+
+#ifndef PGSQL_DELETE_OPTION_UNASSIGNED
+#define PGSQL_DELETE_OPTION_UNASSIGNED(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_options AS o " \
+    "WHERE o.option_id in ( " \
+    "   SELECT o.option_id FROM " #table_prefix "_options AS o " \
+    "   LEFT JOIN " #table_prefix "_options_server AS a ON o.option_id = a.option_id " \
+    "   WHERE a.option_id IS NULL) " #__VA_ARGS__
+#endif
+
+#ifndef PGSQL_DELETE_OPTION_POOL_RANGE
+#define PGSQL_DELETE_OPTION_POOL_RANGE(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_options AS o " \
+    "WHERE " #__VA_ARGS__ \
+    "  AND o.pool_id = " \
+    "  (SELECT id FROM " #table_prefix "_pool" \
+    "   WHERE start_address = cast($1 as inet) AND end_address = cast($2 as inet))"
+#endif
+
+#ifndef PGSQL_DELETE_OPTION_PD_POOL
+#define PGSQL_DELETE_OPTION_PD_POOL(...) \
+    "DELETE FROM dhcp6_options AS o " \
+    "WHERE " #__VA_ARGS__ \
+    "  AND o.pd_pool_id = " \
+    "  (SELECT id FROM dhcp6_pd_pool" \
+    "   WHERE prefix = $1 AND prefix_length = $2)"
+#endif
+
+#ifndef PGSQL_DELETE_CLIENT_CLASS_DEPENDENCY
+#define PGSQL_DELETE_CLIENT_CLASS_DEPENDENCY(table_prefix) \
+    "DELETE FROM " #table_prefix "_client_class_dependency " \
+    "WHERE class_id = (SELECT id FROM " #table_prefix "_client_class WHERE name = $1)"
+#endif
+
+#ifndef PGSQL_DELETE_CLIENT_CLASS_SERVER
+#define PGSQL_DELETE_CLIENT_CLASS_SERVER(table_prefix) \
+    "DELETE FROM " #table_prefix "_client_class_server " \
+    "WHERE class_id = " \
+    "(SELECT id FROM " #table_prefix "_client_class WHERE name = $1)"
+#endif
+
+#ifndef PGSQL_DELETE_CLIENT_CLASS_COMMON
+#define PGSQL_DELETE_CLIENT_CLASS_COMMON(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_client_class AS c " \
+    "USING " \
+    "   " #table_prefix "_client_class_server AS a, " \
+    "   " #table_prefix "_server AS s " \
+    "WHERE " \
+    "  c.id = a.class_id AND " \
+    "  a.server_id = s.id " \
+    #__VA_ARGS__
+
+#define PGSQL_DELETE_CLIENT_CLASS_WITH_TAG(table_prefix, ...) \
+    PGSQL_DELETE_CLIENT_CLASS_COMMON(table_prefix, AND s.tag = $1 __VA_ARGS__)
+
+#define PGSQL_DELETE_CLIENT_CLASS_ANY(table_prefix, ...) \
+    PGSQL_DELETE_CLIENT_CLASS_COMMON(table_prefix, __VA_ARGS__)
+
+#define PGSQL_DELETE_CLIENT_CLASS_UNASSIGNED(table_prefix, ...) \
+    "DELETE FROM " #table_prefix "_client_class AS c " \
+    "WHERE c.id in (" \
+    "   SELECT c.id FROM " #table_prefix "_client_class AS c " \
+    "   LEFT JOIN " #table_prefix "_client_class_server AS a ON c.id = a.class_id " \
+    "   WHERE a.class_id IS NULL) " #__VA_ARGS__
+#endif
+
+#ifndef PGSQL_DELETE_SERVER
+#define PGSQL_DELETE_SERVER(table_prefix) \
+    "DELETE FROM " #table_prefix "_server " \
+    "WHERE tag = $1"
+#endif
+
+#ifndef PGSQL_DELETE_ALL_SERVERS
+#define PGSQL_DELETE_ALL_SERVERS(table_prefix) \
+    "DELETE FROM " #table_prefix "_server " \
+    "WHERE id > 1"
+#endif
+
+} // end of anonymous namespace
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
+
+#endif
diff --git a/src/hooks/dhcp/pgsql_cb/tests/Makefile.am b/src/hooks/dhcp/pgsql_cb/tests/Makefile.am
new file mode 100644
index 0000000..f285cfd
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/tests/Makefile.am
@@ -0,0 +1,64 @@
+SUBDIRS = .
+
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += -I$(top_builddir)/src/hooks/dhcp/pgsql_cb -I$(top_srcdir)/src/hooks/dhcp/pgsql_cb
+AM_CPPFLAGS += $(BOOST_INCLUDES) $(PGSQL_CPPFLAGS)
+AM_CPPFLAGS += -DINSTALL_PROG=\"$(abs_top_srcdir)/install-sh\"
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+# Unit test data files need to get installed.
+EXTRA_DIST =
+
+CLEANFILES = *.gcno *.gcda
+
+TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+TESTS =
+if HAVE_GTEST
+TESTS += pgsql_cb_unittests
+
+pgsql_cb_unittests_SOURCES  = pgsql_cb_impl_unittest.cc
+pgsql_cb_unittests_SOURCES  += pgsql_cb_dhcp4_unittest.cc
+pgsql_cb_unittests_SOURCES += pgsql_cb_dhcp4_mgr_unittest.cc
+pgsql_cb_unittests_SOURCES += pgsql_cb_dhcp6_unittest.cc
+pgsql_cb_unittests_SOURCES += pgsql_cb_dhcp6_mgr_unittest.cc
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+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/config/libkea-cfgclient.la
+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/http/libkea-http.la
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+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/pgsql/testutils/libpgsqltest.la
+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/pgsql/libkea-pgsql.la
+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/database/libkea-database.la
+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+pgsql_cb_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
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new file mode 100644
index 0000000..256f305
--- /dev/null
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+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-recursive
+all-am: Makefile $(PROGRAMS)
+installdirs: installdirs-recursive
+installdirs-am:
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/pgsql_cb_unittests-pgsql_cb_dhcp4_mgr_unittest.Po
+	-rm -f ./$(DEPDIR)/pgsql_cb_unittests-pgsql_cb_dhcp4_unittest.Po
+	-rm -f ./$(DEPDIR)/pgsql_cb_unittests-pgsql_cb_dhcp6_mgr_unittest.Po
+	-rm -f ./$(DEPDIR)/pgsql_cb_unittests-pgsql_cb_dhcp6_unittest.Po
+	-rm -f ./$(DEPDIR)/pgsql_cb_unittests-pgsql_cb_impl_unittest.Po
+	-rm -f ./$(DEPDIR)/pgsql_cb_unittests-run_unittests.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
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+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/pgsql_cb_unittests-pgsql_cb_dhcp4_mgr_unittest.Po
+	-rm -f ./$(DEPDIR)/pgsql_cb_unittests-pgsql_cb_dhcp4_unittest.Po
+	-rm -f ./$(DEPDIR)/pgsql_cb_unittests-pgsql_cb_dhcp6_mgr_unittest.Po
+	-rm -f ./$(DEPDIR)/pgsql_cb_unittests-pgsql_cb_dhcp6_unittest.Po
+	-rm -f ./$(DEPDIR)/pgsql_cb_unittests-pgsql_cb_impl_unittest.Po
+	-rm -f ./$(DEPDIR)/pgsql_cb_unittests-run_unittests.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
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+pdf: pdf-recursive
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+pdf-am:
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+ps: ps-recursive
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+ps-am:
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+uninstall-am:
+
+.MAKE: $(am__recursive_targets) check-am install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-TESTS check-am clean clean-generic \
+	clean-libtool clean-noinstPROGRAMS cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp4_mgr_unittest.cc b/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp4_mgr_unittest.cc
new file mode 100644
index 0000000..5eb0df5
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp4_mgr_unittest.cc
@@ -0,0 +1,88 @@
+// Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <cc/stamped_value.h>
+#include <dhcpsrv/config_backend_dhcp4_mgr.h>
+#include <pgsql_cb_dhcp4.h>
+#include <pgsql/testutils/pgsql_schema.h>
+#include <dhcpsrv/testutils/generic_backend_unittest.h>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::dhcp::test;
+using namespace isc::db;
+using namespace isc::db::test;
+
+namespace {
+
+/// @brief Test fixture class for @c PgSqlConfigBackendDHCPv4Mgr.
+class PgSqlConfigBackendDHCPv4MgrTest : public GenericBackendTest {
+public:
+    /// @brief Constructor.
+    PgSqlConfigBackendDHCPv4MgrTest() {
+        // Recreate a fresh mgr.
+        ConfigBackendDHCPv4Mgr::create();
+
+        // Ensure we have the proper schema with no transient data.
+        createPgSQLSchema();
+    }
+
+    /// @brief Destructor.
+    virtual ~PgSqlConfigBackendDHCPv4MgrTest() {
+        // Destroy the mgr.
+        ConfigBackendDHCPv4Mgr::destroy();
+
+        // If data wipe enabled, delete transient data otherwise destroy the schema.
+        destroyPgSQLSchema();
+    }
+};
+
+// This test verifies that PgSQL backend can be registered with and
+// unregistered from the Config Backend Manager.
+TEST_F(PgSqlConfigBackendDHCPv4MgrTest, factoryRegistration) {
+
+    // Get the mgr singleton.
+    ConfigBackendDHCPv4Mgr& mgr = ConfigBackendDHCPv4Mgr::instance();
+
+    // With no factory registered, attempting to add a PgSQL db should fail.
+    ASSERT_THROW(mgr.addBackend(validPgSQLConnectionString()), InvalidType);
+
+    // Now we'll register the PgSQL factory.
+    ASSERT_NO_THROW(PgSqlConfigBackendDHCPv4::registerBackendType());
+
+    // With the factory registered, attempting to add a PgSQL db should succeed.
+    ASSERT_NO_THROW(mgr.addBackend(validPgSQLConnectionString()));
+
+    // Create a PgSQL backend selector for convenience.
+    BackendSelector pgsql(BackendSelector::Type::POSTGRESQL);
+
+    // Should be able to create a global parameter.
+    StampedValuePtr server_tag = StampedValue::create("server-tag", "whale");
+    ASSERT_NO_THROW(mgr.getPool()->createUpdateGlobalParameter4(pgsql, ServerSelector::ALL(),
+                                                                server_tag));
+    // Verify parameter can be fetched.
+    server_tag.reset();
+    ASSERT_NO_THROW(server_tag = mgr.getPool()->getGlobalParameter4(pgsql, ServerSelector::ALL(),
+                                                                    "server-tag"));
+    ASSERT_TRUE(server_tag);
+    EXPECT_EQ("server-tag", server_tag->getName());
+    EXPECT_EQ("whale", server_tag->getValue());
+
+    // Now we'll unregister PgSQL.
+    ASSERT_NO_THROW(PgSqlConfigBackendDHCPv4::unregisterBackendType());
+
+    // With no factory registered, attempting to add a PgSQL db should fail.
+    ASSERT_THROW(mgr.addBackend(validPgSQLConnectionString()), InvalidType);
+
+    // Attempting to read the global parameter should fail.
+    ASSERT_THROW(mgr.getPool()->getGlobalParameter4(pgsql, ServerSelector::ALL(), "server-tag"),
+                 NoSuchDatabase);
+}
+
+}
diff --git a/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp4_unittest.cc b/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp4_unittest.cc
new file mode 100644
index 0000000..fdd11e8
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp4_unittest.cc
@@ -0,0 +1,513 @@
+// Copyright (C) 2021-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <database/db_exceptions.h>
+#include <database/server.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <dhcpsrv/config_backend_dhcp4_mgr.h>
+#include <dhcpsrv/testutils/generic_cb_dhcp4_unittest.h>
+#include <dhcpsrv/testutils/generic_cb_recovery_unittest.h>
+#include <dhcpsrv/testutils/pgsql_generic_backend_unittest.h>
+#include <dhcpsrv/testutils/test_utils.h>
+#include <pgsql_cb_dhcp4.h>
+#include <pgsql/testutils/pgsql_schema.h>
+#include <testutils/multi_threading_utils.h>
+#include <testutils/gtest_utils.h>
+
+#include <boost/make_shared.hpp>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <map>
+#include <sstream>
+
+using namespace isc;
+using namespace isc::asiolink;
+using namespace isc::db;
+using namespace isc::db::test;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::dhcp::test;
+using namespace isc::process;
+using namespace isc::test;
+using namespace isc::util;
+namespace ph = std::placeholders;
+
+namespace {
+
+/// @brief Test implementation of the PostgreSQL configuration backend.
+///
+/// It exposes protected members of the @c PgSqlConfigBackendDHCPv4.
+class TestPgSqlConfigBackendDHCPv4 : public PgSqlConfigBackendDHCPv4 {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit TestPgSqlConfigBackendDHCPv4(const DatabaseConnection::ParameterMap& parameters)
+        : PgSqlConfigBackendDHCPv4(parameters) {
+    }
+
+    using PgSqlConfigBackendDHCPv4::base_impl_;
+};
+
+/// @brief Test fixture class for @c PgSqlConfigBackendDHCPv4.
+class PgSqlConfigBackendDHCPv4Test : public GenericConfigBackendDHCPv4Test {
+public:
+    /// @brief Constructor.
+    PgSqlConfigBackendDHCPv4Test() {}
+
+    /// @brief Destructor.
+    virtual ~PgSqlConfigBackendDHCPv4Test() {}
+
+    /// @brief Creates the PostgreSQL back end schema
+    virtual void createSchema() {
+        createPgSQLSchema();
+    }
+
+    /// @brief Destroys the PostgreSQL back end schema
+    virtual void destroySchema() {
+        destroyPgSQLSchema();
+    }
+
+    /// @brief Returns a valid PostgreSQL back end specific connection
+    /// string
+    std::string validConnectionString() {
+        return (validPgSQLConnectionString());
+    }
+
+    /// @brief Instantiates an instance of a PostgreSQL DHCPv4 configuration
+    /// back end.
+    ///
+    /// @params Connection parameters describing the back end to create.
+    ///
+    /// @return Pointer to the newly created back end instance.
+    ConfigBackendDHCPv4Ptr backendFactory(db::DatabaseConnection::ParameterMap&
+                                          params) {
+
+        return (ConfigBackendDHCPv4Ptr(new TestPgSqlConfigBackendDHCPv4(params)));
+    }
+
+    /// @brief Counts rows in a selected table in PostgreSQL database.
+    ///
+    /// This method can be used to verify that some configuration elements were
+    /// deleted from a selected table as a result of cascade delete or a trigger.
+    /// For example, deleting a subnet should trigger deletion of its address
+    /// pools and options. By counting the rows on each table we can determine
+    /// whether the deletion took place on all tables for which it was expected.
+    ///
+    /// @param table Table name.
+    /// @return Number of rows in the specified table.
+    size_t countRows(const std::string& table) const {
+        auto p = boost::dynamic_pointer_cast<TestPgSqlConfigBackendDHCPv4>(cbptr_);
+        if (!p) {
+            ADD_FAILURE() << "cbptr_ does not cast to TestPgSqlConfigBackendDHCPv4";
+            return (0);
+        }
+
+        // Reuse the existing connection of the backend.
+        auto impl = boost::dynamic_pointer_cast<PgSqlConfigBackendImpl>(p->base_impl_);
+        auto& conn = impl->conn_;
+
+        return (PgSqlGenericBackendTest::countRows(conn, table));
+    }
+};
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getType) {
+    getTypeTest("postgresql");
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getHost) {
+    getHostTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getPort) {
+    getPortTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, createUpdateDeleteServerTest) {
+    createUpdateDeleteServerTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getAndDeleteAllServersTest) {
+    getAndDeleteAllServersTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, createUpdateDeleteGlobalParameter4Test) {
+    createUpdateDeleteGlobalParameter4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, globalParameters4WithServerTagsTest) {
+    globalParameters4WithServerTagsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getAllGlobalParameters4Test) {
+    getAllGlobalParameters4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getModifiedGlobalParameters4Test) {
+    getModifiedGlobalParameters4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, nullKeyErrorTest) {
+    nullKeyErrorTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, createUpdateSubnet4SelectorsTest) {
+    createUpdateSubnet4SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getSubnet4Test) {
+    getSubnet4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getSubnet4byIdSelectorsTest) {
+    getSubnet4byIdSelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getSubnet4WithOptionalUnspecifiedTest) {
+    getSubnet4WithOptionalUnspecifiedTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getSubnet4SharedNetworkTest) {
+    getSubnet4SharedNetworkTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getSubnet4ByPrefixTest) {
+    getSubnet4ByPrefixTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getSubnet4byPrefixSelectorsTest) {
+    getSubnet4byPrefixSelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getAllSubnets4Test) {
+    getAllSubnets4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getAllSubnets4SelectorsTest) {
+    getAllSubnets4SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getAllSubnets4WithServerTagsTest) {
+    getAllSubnets4WithServerTagsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getModifiedSubnets4SelectorsTest) {
+    getModifiedSubnets4SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, deleteSubnet4Test) {
+    deleteSubnet4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, deleteSubnet4ByIdSelectorsTest) {
+    deleteSubnet4ByIdSelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, deleteSubnet4ByPrefixSelectorsTest) {
+    deleteSubnet4ByPrefixSelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, deleteAllSubnets4SelectorsTest) {
+    deleteAllSubnets4SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, unassignedSubnet4Test) {
+    unassignedSubnet4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getModifiedSubnets4Test) {
+    getModifiedSubnets4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, subnetLifetimeTest) {
+    subnetLifetimeTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getSharedNetworkSubnets4Test) {
+    getSharedNetworkSubnets4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, subnetUpdatePoolsTest) {
+    subnetUpdatePoolsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, subnetOptionsTest) {
+    subnetOptionsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getSharedNetwork4Test) {
+    getSharedNetwork4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getSharedNetwork4SelectorsTest) {
+    getSharedNetwork4SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, createUpdateSharedNetwork4Test) {
+    createUpdateSharedNetwork4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, createUpdateSharedNetwork4SelectorsTest) {
+    createUpdateSharedNetwork4SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getSharedNetwork4WithOptionalUnspecifiedTest) {
+    getSharedNetwork4WithOptionalUnspecifiedTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, deleteSharedNetworkSubnets4Test) {
+    deleteSharedNetworkSubnets4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getAllSharedNetworks4Test) {
+    getAllSharedNetworks4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getAllSharedNetworks4SelectorsTest) {
+    getAllSharedNetworks4SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getAllSharedNetworks4WithServerTagsTest) {
+    getAllSharedNetworks4WithServerTagsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getModifiedSharedNetworks4Test) {
+    getModifiedSharedNetworks4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getModifiedSharedNetworks4SelectorsTest) {
+    getModifiedSharedNetworks4SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, deleteSharedNetwork4Test) {
+    deleteSharedNetwork4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, deleteSharedNetwork4SelectorsTest) {
+    deleteSharedNetwork4SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, deleteAllSharedNetworks4SelectorsTest) {
+    deleteAllSharedNetworks4SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, unassignedSharedNetworkTest) {
+    unassignedSharedNetworkTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, sharedNetworkLifetimeTest) {
+    sharedNetworkLifetimeTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, sharedNetworkOptionsTest) {
+    sharedNetworkOptionsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getOptionDef4Test) {
+    getOptionDef4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, optionDefs4WithServerTagsTest) {
+    optionDefs4WithServerTagsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getAllOptionDefs4Test) {
+    getAllOptionDefs4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getModifiedOptionDefs4Test) {
+    getModifiedOptionDefs4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, createUpdateDeleteOption4Test) {
+    createUpdateDeleteOption4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, globalOptions4WithServerTagsTest) {
+    globalOptions4WithServerTagsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getAllOptions4Test) {
+    getAllOptions4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getModifiedOptions4Test) {
+    getModifiedOptions4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, createUpdateDeleteSubnetOption4Test) {
+    createUpdateDeleteSubnetOption4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, createUpdateDeletePoolOption4Test) {
+    createUpdateDeletePoolOption4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, createUpdateDeleteSharedNetworkOption4Test) {
+    createUpdateDeleteSharedNetworkOption4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, subnetOptionIdOrderTest) {
+    subnetOptionIdOrderTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, sharedNetworkOptionIdOrderTest) {
+    sharedNetworkOptionIdOrderTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, setAndGetAllClientClasses4Test) {
+    setAndGetAllClientClasses4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getClientClass4Test) {
+    getClientClass4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, createUpdateClientClass4OptionsTest) {
+    createUpdateClientClass4OptionsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, getModifiedClientClasses4Test) {
+    getModifiedClientClasses4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, deleteClientClass4Test) {
+    deleteClientClass4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, deleteAllClientClasses4Test) {
+    deleteAllClientClasses4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, clientClassDependencies4Test) {
+    clientClassDependencies4Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4Test, multipleAuditEntriesTest) {
+    multipleAuditEntriesTest();
+}
+
+/// @brief Test fixture for verifying database connection loss-recovery
+/// behavior.
+class PgSqlConfigBackendDHCPv4DbLostCallbackTest : public GenericConfigBackendDbLostCallbackTest {
+public:
+    /// @brief Constructor
+    PgSqlConfigBackendDHCPv4DbLostCallbackTest() {};
+
+    /// @brief Destructor
+    virtual ~PgSqlConfigBackendDHCPv4DbLostCallbackTest() {};
+
+    /// @brief Creates the PostgreSQL CB schema.
+    virtual void createSchema() {
+        createPgSQLSchema();
+    }
+
+    /// @brief Destroys the PostgreSQL CB schema.
+    virtual void destroySchema() {
+        destroyPgSQLSchema();
+    }
+
+    /// @brief Method which returns a valid back end specific connection
+    /// string
+    virtual std::string validConnectionString() {
+        return (validPgSQLConnectionString());
+    }
+
+    /// @brief Method which returns an invalid back end specific connection
+    /// string.
+    virtual std::string invalidConnectionString() {
+        return (connectionString(PGSQL_VALID_TYPE, INVALID_NAME, VALID_HOST,
+                                 VALID_USER, VALID_PASSWORD));
+    }
+
+    /// @brief Registers PostgreSQL as a CB backend type.
+    virtual void registerBackendType() {
+        isc::dhcp::PgSqlConfigBackendDHCPv4::registerBackendType();
+    }
+
+    /// @brief Unregisters PostgreSQL as a CB backend type.
+    virtual void unregisterBackendType() {
+        isc::dhcp::PgSqlConfigBackendDHCPv4::unregisterBackendType();
+    }
+
+    /// @brief Sets the IOService instance in the CB implementation object.
+    ///
+    /// @param io_service pointer to the IOService instance to use. It may be
+    /// an empty pointer.
+    virtual void setConfigBackendImplIOService(isc::asiolink::IOServicePtr io_service) {
+        isc::dhcp::PgSqlConfigBackendImpl::setIOService(io_service);
+    }
+
+    /// @brief  Attempts to add a backend instance to the CB manager.
+    ///
+    /// @param access Connection access string containing the database
+    /// connection parameters.
+    virtual void addBackend(const std::string& access) {
+        ConfigBackendDHCPv4Mgr::instance().addBackend(access);
+    }
+
+    /// @brief Fetches a collection of all the servers currently in
+    /// the CB database.  This function is used to check the operability
+    /// of the CB backend.
+    ServerCollection getAllServers() {
+        return (ConfigBackendDHCPv4Mgr::instance().getPool()->getAllServers4(BackendSelector()));
+    }
+};
+
+TEST_F(PgSqlConfigBackendDHCPv4DbLostCallbackTest, testNoCallbackOnOpenFailure) {
+    MultiThreadingTest mt(false);
+    testNoCallbackOnOpenFailure();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4DbLostCallbackTest, testNoCallbackOnOpenFailureMultiThreading) {
+    MultiThreadingTest mt(true);
+    testNoCallbackOnOpenFailure();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndRecoveredCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndRecoveredCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndRecoveredCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndRecoveredCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndFailedCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndFailedCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndFailedCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndFailedCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndRecoveredAfterTimeoutCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndRecoveredAfterTimeoutCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndRecoveredAfterTimeoutCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndRecoveredAfterTimeoutCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndFailedAfterTimeoutCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndFailedAfterTimeoutCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv4DbLostCallbackTest, testDbLostAndFailedAfterTimeoutCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndFailedAfterTimeoutCallback();
+}
+
+}
diff --git a/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp6_mgr_unittest.cc b/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp6_mgr_unittest.cc
new file mode 100644
index 0000000..cb2b699
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp6_mgr_unittest.cc
@@ -0,0 +1,88 @@
+// Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <cc/stamped_value.h>
+#include <dhcpsrv/config_backend_dhcp6_mgr.h>
+#include <pgsql_cb_dhcp6.h>
+#include <pgsql/testutils/pgsql_schema.h>
+#include <dhcpsrv/testutils/generic_backend_unittest.h>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::dhcp::test;
+using namespace isc::db;
+using namespace isc::db::test;
+
+namespace {
+
+/// @brief Test fixture class for @c PgSqlConfigBackendDHCPv6Mgr.
+class PgSqlConfigBackendDHCPv6MgrTest : public GenericBackendTest {
+public:
+    /// @brief Constructor.
+    PgSqlConfigBackendDHCPv6MgrTest() {
+        // Recreate a fresh mgr.
+        ConfigBackendDHCPv6Mgr::create();
+
+        // Ensure we have the proper schema with no transient data.
+        createPgSQLSchema();
+    }
+
+    /// @brief Destructor.
+    virtual ~PgSqlConfigBackendDHCPv6MgrTest() {
+        // Destroy the mgr.
+        ConfigBackendDHCPv6Mgr::destroy();
+
+        // If data wipe enabled, delete transient data otherwise destroy the schema.
+        destroyPgSQLSchema();
+    }
+};
+
+// This test verifies that PgSQL backend can be registered with and
+// unregistered from the Config Backend Manager.
+TEST_F(PgSqlConfigBackendDHCPv6MgrTest, factoryRegistration) {
+
+    // Get the mgr singleton.
+    ConfigBackendDHCPv6Mgr& mgr = ConfigBackendDHCPv6Mgr::instance();
+
+    // With no factory registered, attempting to add a PgSQL db should fail.
+    ASSERT_THROW(mgr.addBackend(validPgSQLConnectionString()), InvalidType);
+
+    // Now we'll register the PgSQL factory.
+    ASSERT_NO_THROW(PgSqlConfigBackendDHCPv6::registerBackendType());
+
+    // With the factory registered, attempting to add a PgSQL db should succeed.
+    ASSERT_NO_THROW(mgr.addBackend(validPgSQLConnectionString()));
+
+    // Create a PgSQL backend selector for convenience.
+    BackendSelector pgsql(BackendSelector::Type::POSTGRESQL);
+
+    // Should be able to create a global parameter.
+    StampedValuePtr server_tag = StampedValue::create("server-tag", "whale");
+    ASSERT_NO_THROW(mgr.getPool()->createUpdateGlobalParameter6(pgsql, ServerSelector::ALL(),
+                                                                server_tag));
+    // Verify parameter can be fetched.
+    server_tag.reset();
+    ASSERT_NO_THROW(server_tag = mgr.getPool()->getGlobalParameter6(pgsql, ServerSelector::ALL(),
+                                                                    "server-tag"));
+    ASSERT_TRUE(server_tag);
+    EXPECT_EQ("server-tag", server_tag->getName());
+    EXPECT_EQ("whale", server_tag->getValue());
+
+    // Now we'll unregister PgSQL.
+    ASSERT_NO_THROW(PgSqlConfigBackendDHCPv6::unregisterBackendType());
+
+    // With no factory registered, attempting to add a PgSQL db should fail.
+    ASSERT_THROW(mgr.addBackend(validPgSQLConnectionString()), InvalidType);
+
+    // Attempting to read the global parameter should fail.
+    ASSERT_THROW(mgr.getPool()->getGlobalParameter6(pgsql, ServerSelector::ALL(), "server-tag"),
+                 NoSuchDatabase);
+}
+
+}
diff --git a/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp6_unittest.cc b/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp6_unittest.cc
new file mode 100644
index 0000000..b6bdacc
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_dhcp6_unittest.cc
@@ -0,0 +1,517 @@
+// Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <database/db_exceptions.h>
+#include <database/server.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <dhcpsrv/config_backend_dhcp6_mgr.h>
+#include <dhcpsrv/testutils/generic_cb_dhcp6_unittest.h>
+#include <dhcpsrv/testutils/generic_cb_recovery_unittest.h>
+#include <dhcpsrv/testutils/pgsql_generic_backend_unittest.h>
+#include <dhcpsrv/testutils/test_utils.h>
+#include <pgsql_cb_dhcp6.h>
+#include <pgsql/testutils/pgsql_schema.h>
+#include <testutils/multi_threading_utils.h>
+#include <testutils/gtest_utils.h>
+
+#include <boost/make_shared.hpp>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <map>
+#include <sstream>
+
+using namespace isc;
+using namespace isc::asiolink;
+using namespace isc::db;
+using namespace isc::db::test;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::dhcp::test;
+using namespace isc::process;
+using namespace isc::test;
+using namespace isc::util;
+namespace ph = std::placeholders;
+
+namespace {
+
+/// @brief Test implementation of the PostgreSQL configuration backend.
+///
+/// It exposes protected members of the @c PgSqlConfigBackendDHCPv6.
+class TestPgSqlConfigBackendDHCPv6 : public PgSqlConfigBackendDHCPv6 {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param parameters A data structure relating keywords and values
+    /// concerned with the database.
+    explicit TestPgSqlConfigBackendDHCPv6(const DatabaseConnection::ParameterMap& parameters)
+        : PgSqlConfigBackendDHCPv6(parameters) {
+    }
+
+    using PgSqlConfigBackendDHCPv6::base_impl_;
+};
+
+/// @brief Test fixture class for @c PgSqlConfigBackendDHCPv6.
+class PgSqlConfigBackendDHCPv6Test : public GenericConfigBackendDHCPv6Test {
+public:
+    /// @brief Constructor.
+    PgSqlConfigBackendDHCPv6Test() {}
+
+    /// @brief Destructor.
+    virtual ~PgSqlConfigBackendDHCPv6Test() {}
+
+    /// @brief Creates the PostgreSQL back end schema
+    virtual void createSchema() {
+        createPgSQLSchema();
+    }
+
+    /// @brief Destroys the PostgreSQL back end schema
+    virtual void destroySchema() {
+        destroyPgSQLSchema();
+    }
+
+    /// @brief Returns a valid PostgreSQL back end specific connection
+    /// string
+    std::string validConnectionString() {
+        return (validPgSQLConnectionString());
+    }
+
+    /// @brief Instantiates an instance of a PostgreSQL DHCPv6 configuration
+    /// back end.
+    ///
+    /// @params Connection parameters describing the back end to create.
+    ///
+    /// @return Pointer to the newly created back end instance.
+    ConfigBackendDHCPv6Ptr backendFactory(db::DatabaseConnection::ParameterMap&
+                                          params) {
+
+        return (ConfigBackendDHCPv6Ptr(new TestPgSqlConfigBackendDHCPv6(params)));
+    }
+
+    /// @brief Counts rows in a selected table in PostgreSQL database.
+    ///
+    /// This method can be used to verify that some configuration elements were
+    /// deleted from a selected table as a result of cascade delete or a trigger.
+    /// For example, deleting a subnet should trigger deletion of its address
+    /// pools and options. By counting the rows on each table we can determine
+    /// whether the deletion took place on all tables for which it was expected.
+    ///
+    /// @param table Table name.
+    /// @return Number of rows in the specified table.
+    size_t countRows(const std::string& table) const {
+        auto p = boost::dynamic_pointer_cast<TestPgSqlConfigBackendDHCPv6>(cbptr_);
+        if (!p) {
+            ADD_FAILURE() << "cbptr_ does not cast to TestPgSqlConfigBackendDHCPv6";
+            return (0);
+        }
+
+        // Reuse the existing connection of the backend.
+        auto impl = boost::dynamic_pointer_cast<PgSqlConfigBackendImpl>(p->base_impl_);
+        auto& conn = impl->conn_;
+
+        return (PgSqlGenericBackendTest::countRows(conn, table));
+    }
+};
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getType) {
+    getTypeTest("postgresql");
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getHost) {
+    getHostTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getPort) {
+    getPortTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, createUpdateDeleteServerTest) {
+    createUpdateDeleteServerTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getAndDeleteAllServersTest) {
+    getAndDeleteAllServersTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, createUpdateDeleteGlobalParameter6Test) {
+    createUpdateDeleteGlobalParameter6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, globalParameters6WithServerTagsTest) {
+    globalParameters6WithServerTagsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getAllGlobalParameters6Test) {
+    getAllGlobalParameters6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getModifiedGlobalParameters6Test) {
+    getModifiedGlobalParameters6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, nullKeyErrorTest) {
+    nullKeyErrorTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, createUpdateSubnet6SelectorsTest) {
+    createUpdateSubnet6SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getSubnet6Test) {
+    getSubnet6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getSubnet6byIdSelectorsTest) {
+    getSubnet6byIdSelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getSubnet6WithOptionalUnspecifiedTest) {
+    getSubnet6WithOptionalUnspecifiedTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getSubnet6SharedNetworkTest) {
+    getSubnet6SharedNetworkTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getSubnet6ByPrefixTest) {
+    getSubnet6ByPrefixTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getSubnet6byPrefixSelectorsTest) {
+    getSubnet6byPrefixSelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getAllSubnets6Test) {
+    getAllSubnets6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getAllSubnets6SelectorsTest) {
+    getAllSubnets6SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getAllSubnets6WithServerTagsTest) {
+    getAllSubnets6WithServerTagsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getModifiedSubnets6SelectorsTest) {
+    getModifiedSubnets6SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, deleteSubnet6Test) {
+    deleteSubnet6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, deleteSubnet6ByIdSelectorsTest) {
+    deleteSubnet6ByIdSelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, deleteSubnet6ByPrefixSelectorsTest) {
+    deleteSubnet6ByPrefixSelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, deleteAllSubnets6SelectorsTest) {
+    deleteAllSubnets6SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, unassignedSubnet6Test) {
+    unassignedSubnet6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getModifiedSubnets6Test) {
+    getModifiedSubnets6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, subnetLifetimeTest) {
+    subnetLifetimeTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getSharedNetworkSubnets6Test) {
+    getSharedNetworkSubnets6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, subnetUpdatePoolsTest) {
+    subnetUpdatePoolsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, subnetOptionsTest) {
+    subnetOptionsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getSharedNetwork6Test) {
+    getSharedNetwork6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getSharedNetwork6SelectorsTest) {
+    getSharedNetwork6SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, createUpdateSharedNetwork6Test) {
+    createUpdateSharedNetwork6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, createUpdateSharedNetwork6SelectorsTest) {
+    createUpdateSharedNetwork6SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getSharedNetwork6WithOptionalUnspecifiedTest) {
+    getSharedNetwork6WithOptionalUnspecifiedTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, deleteSharedNetworkSubnets6Test) {
+    deleteSharedNetworkSubnets6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getAllSharedNetworks6Test) {
+    getAllSharedNetworks6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getAllSharedNetworks6SelectorsTest) {
+    getAllSharedNetworks6SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getAllSharedNetworks6WithServerTagsTest) {
+    getAllSharedNetworks6WithServerTagsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getModifiedSharedNetworks6Test) {
+    getModifiedSharedNetworks6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getModifiedSharedNetworks6SelectorsTest) {
+    getModifiedSharedNetworks6SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, deleteSharedNetwork6Test) {
+    deleteSharedNetwork6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, deleteSharedNetwork6SelectorsTest) {
+    deleteSharedNetwork6SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, deleteAllSharedNetworks6SelectorsTest) {
+    deleteAllSharedNetworks6SelectorsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, unassignedSharedNetworkTest) {
+    unassignedSharedNetworkTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, sharedNetworkLifetimeTest) {
+    sharedNetworkLifetimeTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, sharedNetworkOptionsTest) {
+    sharedNetworkOptionsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getOptionDef6Test) {
+    getOptionDef6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, optionDefs6WithServerTagsTest) {
+    optionDefs6WithServerTagsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getAllOptionDefs6Test) {
+    getAllOptionDefs6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getModifiedOptionDefs6Test) {
+    getModifiedOptionDefs6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, createUpdateDeleteOption6Test) {
+    createUpdateDeleteOption6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, globalOptions6WithServerTagsTest) {
+    globalOptions6WithServerTagsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getAllOptions6Test) {
+    getAllOptions6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getModifiedOptions6Test) {
+    getModifiedOptions6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, createUpdateDeleteSubnetOption6Test) {
+    createUpdateDeleteSubnetOption6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, createUpdateDeletePoolOption6Test) {
+    createUpdateDeletePoolOption6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, createUpdateDeletePdPoolOption6Test) {
+    createUpdateDeletePdPoolOption6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, createUpdateDeleteSharedNetworkOption6Test) {
+    createUpdateDeleteSharedNetworkOption6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, subnetOptionIdOrderTest) {
+    subnetOptionIdOrderTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, sharedNetworkOptionIdOrderTest) {
+    sharedNetworkOptionIdOrderTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, setAndGetAllClientClasses6Test) {
+    setAndGetAllClientClasses6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getClientClass6Test) {
+    getClientClass6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, createUpdateClientClass6OptionsTest) {
+    createUpdateClientClass6OptionsTest();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, getModifiedClientClasses6Test) {
+    getModifiedClientClasses6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, deleteClientClass6Test) {
+    deleteClientClass6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, deleteAllClientClasses6Test) {
+    deleteAllClientClasses6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, clientClassDependencies6Test) {
+    clientClassDependencies6Test();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6Test, multipleAuditEntriesTest) {
+    multipleAuditEntriesTest();
+}
+
+/// @brief Test fixture for verifying database connection loss-recovery
+/// behavior.
+class PgSqlConfigBackendDHCPv6DbLostCallbackTest : public GenericConfigBackendDbLostCallbackTest {
+public:
+    /// @brief Constructor
+    PgSqlConfigBackendDHCPv6DbLostCallbackTest() {};
+
+    /// @brief Destructor
+    virtual ~PgSqlConfigBackendDHCPv6DbLostCallbackTest() {};
+
+    /// @brief Creates the PostgreSQL CB schema.
+    virtual void createSchema() {
+        createPgSQLSchema();
+    }
+
+    /// @brief Destroys the PostgreSQL CB schema.
+    virtual void destroySchema() {
+        destroyPgSQLSchema();
+    }
+
+    /// @brief Method which returns a valid back end specific connection
+    /// string
+    virtual std::string validConnectionString() {
+        return (validPgSQLConnectionString());
+    }
+
+    /// @brief Method which returns an invalid back end specific connection
+    /// string.
+    virtual std::string invalidConnectionString() {
+        return (connectionString(PGSQL_VALID_TYPE, INVALID_NAME, VALID_HOST,
+                                 VALID_USER, VALID_PASSWORD));
+    }
+
+    /// @brief Registers PostgreSQL as a CB backend type.
+    virtual void registerBackendType() {
+        isc::dhcp::PgSqlConfigBackendDHCPv6::registerBackendType();
+    }
+
+    /// @brief Unregisters PostgreSQL as a CB backend type.
+    virtual void unregisterBackendType() {
+        isc::dhcp::PgSqlConfigBackendDHCPv6::unregisterBackendType();
+    }
+
+    /// @brief Sets the IOService instance in the CB implementation object.
+    ///
+    /// @param io_service pointer to the IOService instance to use. It may be
+    /// an empty pointer.
+    virtual void setConfigBackendImplIOService(isc::asiolink::IOServicePtr io_service) {
+        isc::dhcp::PgSqlConfigBackendImpl::setIOService(io_service);
+    }
+
+    /// @brief  Attempts to add a backend instance to the CB manager.
+    ///
+    /// @param access Connection access string containing the database
+    /// connection parameters.
+    virtual void addBackend(const std::string& access) {
+        ConfigBackendDHCPv6Mgr::instance().addBackend(access);
+    }
+
+    /// @brief Fetches a collection of all the servers currently in
+    /// the CB database.  This function is used to check the operability
+    /// of the CB backend.
+    ServerCollection getAllServers() {
+        return (ConfigBackendDHCPv6Mgr::instance().getPool()->getAllServers6(BackendSelector()));
+    }
+};
+
+TEST_F(PgSqlConfigBackendDHCPv6DbLostCallbackTest, testNoCallbackOnOpenFailure) {
+    MultiThreadingTest mt(false);
+    testNoCallbackOnOpenFailure();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6DbLostCallbackTest, testNoCallbackOnOpenFailureMultiThreading) {
+    MultiThreadingTest mt(true);
+    testNoCallbackOnOpenFailure();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndRecoveredCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndRecoveredCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndRecoveredCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndRecoveredCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndFailedCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndFailedCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndFailedCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndFailedCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndRecoveredAfterTimeoutCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndRecoveredAfterTimeoutCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndRecoveredAfterTimeoutCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndRecoveredAfterTimeoutCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndFailedAfterTimeoutCallback) {
+    MultiThreadingTest mt(false);
+    testDbLostAndFailedAfterTimeoutCallback();
+}
+
+TEST_F(PgSqlConfigBackendDHCPv6DbLostCallbackTest, testDbLostAndFailedAfterTimeoutCallbackMultiThreading) {
+    MultiThreadingTest mt(true);
+    testDbLostAndFailedAfterTimeoutCallback();
+}
+
+}
diff --git a/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_impl_unittest.cc b/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_impl_unittest.cc
new file mode 100644
index 0000000..025eb33
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/tests/pgsql_cb_impl_unittest.cc
@@ -0,0 +1,80 @@
+// Copyright (C) 2021-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <dhcpsrv/testutils/pgsql_generic_backend_unittest.h>
+#include <pgsql/testutils/pgsql_schema.h>
+#include <testutils/gtest_utils.h>
+
+#include <gtest/gtest.h>
+#include <pgsql_cb_impl.h>
+#include <vector>
+
+using namespace isc::db;
+using namespace isc::dhcp;
+using namespace isc::dhcp::test;
+using namespace isc::util;
+
+namespace {
+
+class PgSqlConfigBackendTest : public PgSqlGenericBackendTest {
+public:
+    PgSqlConfigBackendTest() : PgSqlGenericBackendTest() {
+        createFullSchema();
+    }
+
+    /// @brief Setup for each test.
+    ///
+    /// Creates the configuration backend impl.
+    virtual void SetUp() {
+        DatabaseConnection::ParameterMap params;
+        params["name"] = "keatest";
+        params["password"] = "keatest";
+        params["user"] = "keatest";
+        ASSERT_NO_THROW_LOG(cbptr_.reset(new PgSqlConfigBackendImpl(params, 0, 0)));
+    }
+
+    /// @brief Cleans up after each test.
+    ///
+    /// Destroys the configuration backend impl.
+    virtual void TearDown() {
+        ASSERT_NO_THROW_LOG(cbptr_.reset());
+    }
+
+    ~PgSqlConfigBackendTest() {
+        destroyFullSchema();
+    }
+
+    /// @brief creates full schema (slow!)
+    ///
+    /// If possible, use simpler, faster alternative: @ref createDummySchema();
+    /// Don't forget to tear it down with @ref destroyFullSchema();
+    void createFullSchema() {
+        // Create the actual full Kea schema.
+        isc::db::test::createPgSQLSchema();
+    }
+
+    /// @brief destroys the full schema (slow!)
+    ///
+    /// Don't forget to call this method once you're done, if you used @ref createFullSchema().
+    void destroyFullSchema() {
+        // Clean up after ourselves.
+        isc::db::test::destroyPgSQLSchema();
+    }
+
+    boost::shared_ptr<PgSqlConfigBackendImpl> cbptr_;
+};
+
+// Let's start with absolute basics.  This should construct a backend instance
+// connected to the unit test schema.  The backend instance is created in
+// Setup() and which will ASSERT on failures.
+TEST_F(PgSqlConfigBackendTest, constructor) {
+    //  Is this the right config backend type?
+    EXPECT_EQ("postgresql", cbptr_->getType());
+}
+
+}  // namespace
diff --git a/src/hooks/dhcp/pgsql_cb/tests/run_unittests.cc b/src/hooks/dhcp/pgsql_cb/tests/run_unittests.cc
new file mode 100644
index 0000000..74904a3
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/tests/run_unittests.cc
@@ -0,0 +1,20 @@
+// Copyright (C) 2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <log/logger_support.h>
+
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+    isc::log::initLogger();
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/hooks/dhcp/pgsql_cb/version.cc b/src/hooks/dhcp/pgsql_cb/version.cc
new file mode 100644
index 0000000..f232709
--- /dev/null
+++ b/src/hooks/dhcp/pgsql_cb/version.cc
@@ -0,0 +1,18 @@
+// Copyright (C) 2021-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <hooks/hooks.h>
+
+extern "C" {
+
+/// @brief returns Kea hooks version.
+int version() {
+    return (KEA_HOOKS_VERSION);
+}
+
+}
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-13 12:15:43 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-13 12:15:43 +0000
commit	f5f56e1a1c4d9e9496fcb9d81131066a964ccd23 (patch)
tree	49e44c6f87febed37efb953ab5485aa49f6481a7 /src/hooks/dhcp/pgsql_cb
parent	Initial commit. (diff)
download	isc-kea-upstream.tar.xz isc-kea-upstream.zip