- Rename migration file to match the table it creates (extension_storage)
- Replace unsafe assert patterns in API with proper None guards
- Add direct import of ExtensionStorage into api.py (removes runtime import)
- Add missing requestBody OpenAPI spec to set_user and set_resource
- Add _key_to_fernet docstring
- Add test_list_resource_filtered_by_category (parity with list_global/list_user)
- Add docs/developer_docs/extensions/extension-points/persistent-storage.md
covering all three scopes, REST API, frontend/backend usage examples,
encryption, key rotation, and data model table
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
