2 Reminders to myself or whoever else ever looks in here...
4 SQLite needs some heavy refactoring, the subroutines are becoming too complex to understand easily.
7 Fix multiple rels between same pair of tables
8 If local column is UNIQUE or PK, use has_one() for relation?
9 Re-scan relations/tables after initial relation setup to find ->many_to_many() relations to be set up?
10 Check NULLability of columns involved in the relationship, which might suggest a more optimal non-default -join-type?