- Created app/lib_api_crud_v3.py to house core security, filtering, and sanitization logic.
- Implemented reusable sanitize_payload() to generically strip virtual lookup fields (*_id_random) and view-only fields (fields_to_exclude_from_db).
- Updated app/routers/api_crud_v3.py to use the new library and consolidated sanitization across all Create/Update endpoints.
- Documented Phase 1 completion in documentation/REFACTOR_API_CRUD_V3.md.