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I'm guessing those numbers are cumulative across all the databases scanned, not within one.

No, it was a single real-world database.

Just in case if it looks surprisingly that Postgres can deal with such numbers of objects, I suggest checking this out: https://www.pgcon.org/2013/schedule/attachments/283_Billion_...

I don’t think they were questioning the possibility, just the practical need of it.

I think you should include the BTP database in the CI test suite ;)