Using POSper/Developer guide/Database-Table descriptions
The information on this page is confirmed up to POSper revision 423
These tables are simply storehouses for the next available id for other tables that they serve.
Restaurant specific tables
These tables seem fairly specific to a restaurant setting rather than being generally applicable to any POS.
These tables are spatial by nature
These tables deal with handling tickets
These tables manage users including user rights
The rest of the tables