Ron Johnson <ronljohnsonjr@gmail.com> writes:
> What matters is that the DBA can see "ah, Bob altered table foo last
> Thursday at 14:30. Let's check the log file to see what he did."
I'm not finding that argument terribly convincing. If you have a
DDL log file, you can grep it to find the last change (and the
ones before that, in case it was Alice's fault not Bob's). If
you don't have such a log file, how much does a last-changed
timestamp really help you?
regards, tom lane