Seref Arikan <serefarikan(at)kurumsalteknoloji(dot)com> writes:
> What may be building up here? I suspect deleting all rows from the temp
> tables is not really deleting them since this is all happening in a
> transaction, but it is my uneducated guess only.
I suspect you suspect correctly. Autovacuum does not touch temp tables,
so it won't help you deal with deleted tuples. Given the usage pattern
you're describing, I think that using a TRUNCATE rather than
delete-all-the-rows would help ... but if you're already doing that,
we need more info.
regards, tom lane