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However, Postgres doesn't have good support for creating derived append-only logs ???? A one line trigger will give you derived append only log that is transactionally consistent.

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so how does that one-liner transform data from log A to log B in realtime?

are talking about creating a new table or materialised views or stored procedures or...?

In your post you are proposing to have a table be equivalent to a kafka topic. So derived "log"/topic can be another table updated with a trigger.

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