Something else I noticed: the error message from ALTER TABLE ... ADD CONSTRAINT in the case of a duplicate constraint name is not very friendly:
ERROR: duplicate key value violates unique constraint "pg_constraint_conrelid_contypid_conname_index" DETAIL: Key (conrelid, contypid, conname)=(16540, 0, nn) already exists. To match the error message for other constraint types, this should be: ERROR: constraint "nn" for relation "foo" already exists Regards, Dean
