Resource identifier of the paradox database.
The record number is an artificial number counting records in the order
as they are stored in the database. The first record has number 0.
This function deletes a record from the database. It does not free
the space in the database file but just marks it as deleted. Inserting
a new record afterwards will reuse the space.
This function is only available if pxlib >= 0.6.0 is used.