Clear previous changes before locking process for heartbeat #351
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For example, in case of a previous heartbeat failed because of a DB issue (with SQLite depending on configuration, a `BusyException` is not rare) and we still have the unpersisted value in `last_heartbeat_at`, which means that `with_lock` will result in: ``` RuntimeError: Locking a record with unpersisted changes is not supported ``` Fixes #350
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For example, in case of a previous heartbeat failed because of a DB issue (with SQLite depending on configuration, a
BusyExceptionis not rare) and we still have the unpersisted value inlast_heartbeat_at, which means thatwith_lockwill result in:Fixes #350