Document legacy BOM tables

bible-local/03-database.md

@@ -113,6 +113,17 @@ Database: `RFQ_LOG`
 | `qt_partnumber_book_items` | PN→LOT mapping rows (written by PriceForge) | SELECT |
 | `qt_vendor_partnumber_seen` | Vendor PN tracking for unresolved/ignored BOM rows (`is_ignored`) | INSERT only for new `partnumber`; existing rows must not be modified |
 
+Legacy server tables not used by QuoteForge runtime anymore:
+
+- `qt_bom`
+- `qt_lot_bundles`
+- `qt_lot_bundle_items`
+
+QuoteForge canonical BOM storage is:
+
+- `qt_configurations.vendor_spec`
+- row-level PN -> multiple LOT decomposition in `vendor_spec[].lot_mappings[]`
+
 `qt_client_schema_state` current contract:
 
 - identity key: `username + hostname`