When I have seen it, "ns_db not enabled" seemed to mean that AOLserver can't talk to the database. At all. So, check earlier in your server.log for issues when AOLserver tried to load postgresql.so and you may find the reason.
The datamodel issue may be a separate issue relating to PG 7.2devel.
It's a total guess, but I don't think much has changed in OpenACS 3.2.5 CVS since the 3.2.5 release anyway, whereas PG 7.2devel sounds... well, like development code. Perhaps PG 7.2devel is not ready for prime time yet, and/or it needs a modified AOLserver driver module compared to PG 7.1?
You could test these guesses by switching to the released OpenACS 3.2.5 and seeing if that helps, and then by switching to the latest released PG (7.1.2) and see if that helps... if you still get the problem then... blame AOLserver 3.3+ad13? Or your postgresql.so driver module?
