PaperTrail VS wal2json

if the source (web) application makes their own audit tables. ex: our ruby on rails application uses the paper-trail gem

Start with https://github.com/paper-trail-gem/paper_trail

We use paper_trail for this

I think you could use that in conjunction with the paper_trail gem, as /u/GreenCalligrapher571 mentioned, which is also a good suggestion. As an additional note, when changing records in production while using the paper_trail gem, I suggest wrapping your database-mutating statements executed in the rails console within a whodunnit block, so PaperTrail.request(whodunnit: 'Dorian Marié') { widget.update name: 'Wibble' } or something rather than just widget.update name: 'Wibble'. Or, if you have some sort of issue-tracking / ticketing system, you could set the whodunnit value to the ticket number or whatever, and then anyone who wants to know why the records are in the state they're in can consult that ticket, which hopefully has additional relevant context.

For a while we did this using the paper-trail gem. This was a very simple way to add a few lines of code to keep track of all of the changes made to an ActiveRecord model. But it came with one drawback. Every change to the data had to be done through ActiveRecord. There are often times when this makes an app vulnerable to a race condition. I’ll use a contrived example so as not to share any real code from our client’s app.

In most designs, this would probably not be possible unless a table tracking extension is being used in an ORM. Even with change tracking enabled through extensions like paper trail or Django simple history, it can be tricky to restore deleted entities. Object tracking would need to have been enabled before it is needed to ensure the data is still around to be restored.

Maybe you are looking for the papertrail gem? https://github.com/paper-trail-gem/paper_trail

To illustrate the above, let’s look at an example, using wal2json for convenience. An update event looks something like this:

You could also use tools in conjunction with logical replication to stream changes, like debezium or wal2json.

I've done CDC before for mysql and postgres, in both cases, rolled my own 200~ loc python scripts. No experience with DMS. Debezium, as I understand, needs a kafka topic to stream to, so wasn't workable for us. Rolling our own proved to be fairly trivial. For postgres, there's wal2json https://github.com/eulerto/wal2json

I was researching for the whole day and found out https://github.com/eulerto/wal2json and postgres bult-in `pgoutput` plugin help me to catch the changes.

I don't think this is something for "rails" to do per se, and more the underlying DB. replication tools to capture a "change log". I have use postgres Write Ahead Logs (WAL) shipped to s3 in json format https://github.com/eulerto/wal2json

[0] https://supabase.com [1] https://github.com/supabase/realtime [2] https://github.com/eulerto/wal2json [3] https://github.com/supabase/walrus [4] https://gsd.di.uminho.pt/members/cbm/ps/delta-crdt-draft16ma... [5] https://supabase.com/blog/2022/04/01/supabase-realtime-with-... [6] https://fly.io [7] https://github.com/supabase/realtime/tree/multiplayer [8] https://github.com/supabase/supabase/tree/master/docker

wal2json Output Plugin that converts WAL output to JSON objects [Open Source] pg_recvlogical Postgres app that can consume update stream [Out-of-the-box with Postgres] decoderbufs Output Plugin that delivers data as protobuf [Open Source, Used in Debezium]