Yeah, this was the approach I was imagining before someone mentioned Materialized View (proper).
Once I heard those words mentioned, I began to imagine what sort of interaction with a foreign data source's operations log FDW might have.
Of course, and depending on the foreign data source, you could probably even expose an operations log to Postgres via a FDW by defining it as a foreign table... Effectively opening up the possibility of eventually consistent replication. Lots of data stores' operations logs are accessible data collections/tables anyways.
