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diff --git a/services/sync/modules/constants.sys.mjs b/services/sync/modules/constants.sys.mjs
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+/* 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/. */
+
+// Don't manually modify this line, as it is automatically replaced on merge day
+// by the gecko_migration.py script.
+export const WEAVE_VERSION = "1.126.0";
+
+// Sync Server API version that the client supports.
+export const SYNC_API_VERSION = "1.5";
+
+// Version of the data format this client supports. The data format describes
+// how records are packaged; this is separate from the Server API version and
+// the per-engine cleartext formats.
+export const STORAGE_VERSION = 5;
+export const PREFS_BRANCH = "services.sync.";
+
+// Put in [] because those aren't allowed in a collection name.
+export const DEFAULT_KEYBUNDLE_NAME = "[default]";
+
+// Key dimensions.
+export const SYNC_KEY_ENCODED_LENGTH = 26;
+export const SYNC_KEY_DECODED_LENGTH = 16;
+
+export const NO_SYNC_NODE_INTERVAL = 10 * 60 * 1000; // 10 minutes
+
+export const MAX_ERROR_COUNT_BEFORE_BACKOFF = 3;
+
+// Backoff intervals
+export const MINIMUM_BACKOFF_INTERVAL = 15 * 60 * 1000; // 15 minutes
+export const MAXIMUM_BACKOFF_INTERVAL = 8 * 60 * 60 * 1000; // 8 hours
+
+// HMAC event handling timeout.
+// 10 minutes = a compromise between the multi-desktop sync interval
+// and the mobile sync interval.
+export const HMAC_EVENT_INTERVAL = 600000;
+
+// How long to wait between sync attempts if the Master Password is locked.
+export const MASTER_PASSWORD_LOCKED_RETRY_INTERVAL = 15 * 60 * 1000; // 15 minutes
+
+// 50 is hardcoded here because of URL length restrictions.
+// (GUIDs can be up to 64 chars long.)
+// Individual engines can set different values for their limit if their
+// identifiers are shorter.
+export const DEFAULT_GUID_FETCH_BATCH_SIZE = 50;
+
+// Default batch size for download batching
+// (how many records are fetched at a time from the server when batching is used).
+export const DEFAULT_DOWNLOAD_BATCH_SIZE = 1000;
+
+// score thresholds for early syncs
+export const SINGLE_USER_THRESHOLD = 1000;
+export const MULTI_DEVICE_THRESHOLD = 300;
+
+// Other score increment constants
+export const SCORE_INCREMENT_SMALL = 1;
+export const SCORE_INCREMENT_MEDIUM = 10;
+
+// Instant sync score increment
+export const SCORE_INCREMENT_XLARGE = 300 + 1; //MULTI_DEVICE_THRESHOLD + 1
+
+// Delay before incrementing global score
+export const SCORE_UPDATE_DELAY = 100;
+
+// Delay for the back observer debouncer. This is chosen to be longer than any
+// observed spurious idle/back events and short enough to pre-empt user activity.
+export const IDLE_OBSERVER_BACK_DELAY = 100;
+
+// Duplicate URI_LENGTH_MAX from Places (from nsNavHistory.h), used to discard
+// tabs with huge uris during tab sync.
+export const URI_LENGTH_MAX = 65536;
+
+export const MAX_HISTORY_UPLOAD = 5000;
+export const MAX_HISTORY_DOWNLOAD = 5000;
+
+// Top-level statuses
+export const STATUS_OK = "success.status_ok";
+export const SYNC_FAILED = "error.sync.failed";
+export const LOGIN_FAILED = "error.login.failed";
+export const SYNC_FAILED_PARTIAL = "error.sync.failed_partial";
+export const CLIENT_NOT_CONFIGURED = "service.client_not_configured";
+export const STATUS_DISABLED = "service.disabled";
+export const MASTER_PASSWORD_LOCKED = "service.master_password_locked";
+
+// success states
+export const LOGIN_SUCCEEDED = "success.login";
+export const SYNC_SUCCEEDED = "success.sync";
+export const ENGINE_SUCCEEDED = "success.engine";
+
+// login failure status codes
+export const LOGIN_FAILED_NO_USERNAME = "error.login.reason.no_username";
+export const LOGIN_FAILED_NO_PASSPHRASE = "error.login.reason.no_recoverykey";
+export const LOGIN_FAILED_NETWORK_ERROR = "error.login.reason.network";
+export const LOGIN_FAILED_SERVER_ERROR = "error.login.reason.server";
+export const LOGIN_FAILED_INVALID_PASSPHRASE = "error.login.reason.recoverykey";
+export const LOGIN_FAILED_LOGIN_REJECTED = "error.login.reason.account";
+
+// sync failure status codes
+export const METARECORD_DOWNLOAD_FAIL =
+  "error.sync.reason.metarecord_download_fail";
+export const VERSION_OUT_OF_DATE = "error.sync.reason.version_out_of_date";
+export const CREDENTIALS_CHANGED = "error.sync.reason.credentials_changed";
+export const ABORT_SYNC_COMMAND = "aborting sync, process commands said so";
+export const NO_SYNC_NODE_FOUND = "error.sync.reason.no_node_found";
+export const OVER_QUOTA = "error.sync.reason.over_quota";
+export const SERVER_MAINTENANCE = "error.sync.reason.serverMaintenance";
+
+export const RESPONSE_OVER_QUOTA = "14";
+
+// engine failure status codes
+export const ENGINE_UPLOAD_FAIL = "error.engine.reason.record_upload_fail";
+export const ENGINE_DOWNLOAD_FAIL = "error.engine.reason.record_download_fail";
+export const ENGINE_UNKNOWN_FAIL = "error.engine.reason.unknown_fail";
+export const ENGINE_APPLY_FAIL = "error.engine.reason.apply_fail";
+// an upload failure where the batch was interrupted with a 412
+export const ENGINE_BATCH_INTERRUPTED = "error.engine.reason.batch_interrupted";
+
+// Ways that a sync can be disabled (messages only to be printed in debug log)
+export const kSyncMasterPasswordLocked =
+  "User elected to leave Primary Password locked";
+export const kSyncWeaveDisabled = "Weave is disabled";
+export const kSyncNetworkOffline = "Network is offline";
+export const kSyncBackoffNotMet =
+  "Trying to sync before the server said it's okay";
+export const kFirstSyncChoiceNotMade =
+  "User has not selected an action for first sync";
+export const kSyncNotConfigured = "Sync is not configured";
+export const kFirefoxShuttingDown = "Firefox is about to shut down";
+
+export const DEVICE_TYPE_DESKTOP = "desktop";
+export const DEVICE_TYPE_MOBILE = "mobile";
+
+export const SQLITE_MAX_VARIABLE_NUMBER = 999;