# Integration API Contracts Audit

We found the following Pydantic models in `backend/main.py`:

- **Alert**: Used for system notifications.
- **IssueCreate** / **IssuePatch**: For handling issues.
- **SOSPayload**: Triggered by guest/staff in emergencies with `lat`/`lng`.
- **GossipTrackingStart**: Related to tracking a person via the gossip network.
- **LoginPayload** / **RefreshPayload** / **LogoutPayload**: Auth mechanisms.
- **TrackingResetPayload**: To reset the session tracking.
- **ChatPayload**: For LLM/Chat interactions.

The contracts are clean and utilize standard types. Most use `Optional` extensively, offering flexibility but requiring robust `None` checking in downstream handlers.