Added all of chat-topics, persona;-history, projects, receipts and vehicle. This is the knowledge base section after all....

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+# Vehicle Knowledge Database
+
+SQLite one-stop index for vehicle records stored under `knowledge/personal-history/vehicle-*`.
+
+## Files
+
+- `vehicles.sqlite` — searchable vehicle/service database.
+
+Source images/PDFs stay in the per-vehicle source folders; the database stores text, line items, observations, follow-ups, and source paths.
+
+## Main tables
+
+- `vehicles` — one row per vehicle.
+- `service_records` — one row per service/invoice.
+- `service_line_items` — invoice/service parts, labour, consumables and fluids.
+- `service_work_notes` — work performed, observations and follow-up items.
+- `inspection_values` — measurable details like brake %, battery CCA, coolant %, tyre pressures.
+- `source_documents` — paths to source photos/PDFs.
+
+## Helpful views
+
+- `vehicle_service_summary`
+- `open_followups`
+
+## Useful queries
+
+```sql
+-- All vehicles
+SELECT display_name, registration, vin, colour, build_date
+FROM vehicles
+ORDER BY display_name;
+
+-- Service history summary
+SELECT *
+FROM vehicle_service_summary
+ORDER BY service_date DESC;
+
+-- Open follow-ups / things to fix
+SELECT display_name, registration, service_date, note
+FROM open_followups
+ORDER BY service_date DESC, display_name;
+
+-- All costs by vehicle
+SELECT v.display_name, v.registration, ROUND(SUM(sr.total), 2) AS total_spend
+FROM vehicles v
+JOIN service_records sr ON sr.vehicle_id = v.id
+GROUP BY v.id
+ORDER BY total_spend DESC;
+
+-- Search line items
+SELECT v.display_name, v.registration, sr.service_date, li.item_code, li.description, li.quantity, li.total
+FROM service_line_items li
+JOIN service_records sr ON sr.id = li.service_record_id
+JOIN vehicles v ON v.id = sr.vehicle_id
+WHERE li.description LIKE '%oil%'
+ORDER BY sr.service_date DESC;
+
+-- Brake/battery/tyre inspection values
+SELECT v.display_name, v.registration, sr.service_date, iv.system, iv.metric, iv.value, iv.notes
+FROM inspection_values iv
+JOIN service_records sr ON sr.id = iv.service_record_id
+JOIN vehicles v ON v.id = sr.vehicle_id
+ORDER BY sr.service_date DESC, iv.system, iv.metric;
+```
+
+## Import convention
+
+When adding future vehicle documents:
+
+1. Keep original images/PDFs under the relevant per-vehicle `_source-documents/` folder.
+2. Write/update the Markdown service note.
+3. Import/update `vehicles.sqlite` with vehicle, service, line-item, follow-up and inspection rows.
+4. Do not delete source files; they remain the source of truth.