The orginal poster is using PostgreSQL. I don't use PostgreSQL much, but I did a quick scan over thier docs. PostgreSQL doesn't appear to have the same autmatic TIMESTAMP updates that MySQL has. Someone more familer with PostgreSQL will have to verify this for me, though.

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I wanted to explore how Perl's closures can be manipulated, and ended up creating an object system by accident.
-- Schemer

Note: All code is untested, unless otherwise stated