db: Follow-up to [9210], re-added `PRIMARY KEY` in addition to `SERIAL` for PostgreSQL (comment:39:ticket:6466).
db: Follow-up to [9210], re-added `PRIMARY KEY` in addition to `SERIAL` for PostgreSQL (comment:39:ticket:6466).

pkdevbox/trac,pkdevbox/trac,pkdevbox/trac,pkdevbox/trac