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Remove the existing timeout on `key`, turning the key from _volatile_ (a key
with an expire set) to _persistent_ (a key that will never expire as no timeout
is associated).
@return
@integer-reply, specifically:
- `1` if the timeout was removed.
- `0` if `key` does not exist or does not have an associated timeout.
@examples
```cli
SET mykey "Hello"
EXPIRE mykey 10
TTL mykey
PERSIST mykey
TTL mykey
```
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