OIDs in user tables are deprecated in postgresql 8.1 (and relying on them has been discouraged for many versions now).
How heavily does SA rely on rowids?
Foo.selectone(foo.select(foo.c.id==1))
generates sql that only depends on the PK id, but
Foo.get(1)
dies complaining of oid absence. Seems strange that get doesn't use a known PK.
