- Migrated event_device and event_session models to the V3 Vision ID pattern (string-based public IDs).
- Added root_validator for automatic id_random mapping and integer stripping.
- Implemented fields_to_exclude_from_db to protect database updates from convenience/view fields.
- Fixed description_json type in Journal_Base for correct JSON parsing.
- Added E2E verification tests for event_device and event_session V3 endpoints.