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adds support for non-temporary replication slots
When the slot is restarted, it will start back at the last wal_end+1 that walex returned in the keep-alive reply to postgres.
Transactions processed between the last keep-alive and the interruption of walex will be replayed.
If event replay is problematic, the end-user must implement a way to mark LSN/transactions as processed to avoid re-processing.
Also event loss is possible currently in this situation:
we made another PR to address this and will submit it shortly