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old values in the update event

in case of update events sometimes it's useful to know which row is updated.
currently only new values will be stored in the event struct:

psql-streamer/source/postgres/postgres.go

Lines 321 to 324 in 27c70ce

 case pgoutput.Insert: 

 ev, err = s.generateEvent(event.ActionInsert, v.RelationID, v.Row) 

 case pgoutput.Update: 

 ev, err = s.generateEvent(event.ActionUpdate, v.RelationID, v.Row)

possible timeout occured on pgx connection

I have many errors in log like:

2021/09/27 00:47:25.613785 Source-PSQL (db1): Replication error (walPositionPersisted: 290579576): replication failed: nil message received, should not happen

And in postgresql logs:

021-09-26 22:01:08.808 UTC [1834] ERROR:  replication slot "db1" already exists
2021-09-26 22:01:08.814 UTC [1834] LOG:  starting logical decoding for slot "db1"
2021-09-26 22:01:08.814 UTC [1834] DETAIL:  Streaming transactions committing after 0/14AC5220, reading WAL from 0/14BA1F70.
2021-09-26 22:01:08.815 UTC [1834] LOG:  logical decoding found consistent point at 0/14BA1F70
2021-09-26 22:01:08.815 UTC [1834] DETAIL:  There are no running transactions.
2021-09-26 22:01:21.908 UTC [1844] ERROR:  replication slot "db1" already exists
2021-09-26 22:01:21.913 UTC [1844] LOG:  starting logical decoding for slot "db1"
2021-09-26 22:01:21.913 UTC [1844] DETAIL:  Streaming transactions committing after 0/14AC5220, reading WAL from 0/14BA1F70.
2021-09-26 22:01:21.914 UTC [1844] LOG:  logical decoding found consistent point at 0/14BA1F70
2021-09-26 22:01:21.914 UTC [1844] DETAIL:  There are no running transactions.

The investigation leads me to Start method of Subscription struct in pgoutput package: https://github.com/blind-oracle/pgoutput/blob/master/sub.go#L98 which calls from https://github.com/blind-oracle/psql-streamer/blob/master/source/postgres/postgres.go#L286

It looks like psql-streamer breaks a connection to database but I'm not sure. Or pgx does it.
Have you seen an error similar to mine? How did you solve it?

Does it PRODUCTION ready ?

@blind-oracle hi there, do you use the psql-streamer in production? Or it's test pet project ?

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