HOT question - insert/delete

Hello!

Is HOT in 8.3 used in the following scenario:
INSERT ...
DELETE ...
at the same ratio.

So for example current data is added every minute and all old data
older than 2 years are deleted.

Would the heap be bloated or is this avoided by the HOT feature of 8.3 and
nearly kept constant?

Or is vacuum still needed for this scenario?

Thnx.

Ciao,
Gerhard

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