These pages document the database schema of Photo Organizer.
The specific pages for the database elements (tables, views, sequences, indexes and functions) will contain the history of the database all the way back to the 2.05 release of Photo Organizer.
To get the current database schema out of PostgreSQL you can use pg_dump:
$ pg_dump --schema po_db > po.schema
A dump of po-2.33c can be found here.
Another way to inspect your PO database is by using pgAccess. → Not available for current versions of PostgreSQL it seems.