When your configuration value from PG15 was different from the old default and the new default on something like the statement timeout, and the statement timeout was previously working fine, and obstensibly set for a reason.... I dunno, are you going to question the value that much?

And you might say "well I know how a statement timeout works" and I agree! I would also generally agree that something like a timezone setting would generally be something I'd expect to be fairly stable.

That's what I meant about rebuilding the config from scratch. Rebuilding from scratch would almost involve _not even looking at the existing configuration_ and then doing first principles footwork to figure out what is needed.

I think the diffing flow you went through is the right way to do it, but I believe that flow might lead to some values getting less scrutiny than others. Still perfectly reasonable though