Martijn van Oosterhout <kleptog(at)svana(dot)org> writes:
> The really nasty thing about it is that because the records are now
> considered really old, as soon as you do run VACUUM it'll start
> removing the rows you want to save...
You sure about that? I think VACUUM just tests for "committed or not".
I'm too lazy to set up a test case, but it's possible that VACUUM FREEZE
would resurrect wrapped-around tuples, or could be made to with only a
small code tweak.
regards, tom lane