- Register all missing migrations in runner.py
- Make v4.3 idempotent (rename xml_unsigned only if exists)
- Make v3.3 idempotent (skip warehouse_inventory/purchase_order_items ops when tables/columns missing)
- Mark v3.3.1 and v3.9 as master-only (SKIP)
- Mark v3.5.1 as optional (skip if whatsapp tables missing)
- Runner skips files marked with '-- : SKIP'