Would CLUSTER / REINDEX still have an effect if our queries were done via sequential scan?

SELECTS don't write to the database, so they have no effect at all on vacuuming/analyzing. You only need to worry about that with writes.

This is a old database (as in built by me when i was just starting to learn unix / postgres) so the database design is pretty horrible (little normalisation, no indexes).

No indexes?  Bloody hell :D

Use EXPLAIN ANALYZE SELECT ... ; on all of your selects to see where they are slow and where you can add indexes...


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