Handoff: RTSport Backend Implementation

What: Build FastAPI backend from contract.md as source of truth. Implement all Pydantic schemas, API endpoints, and PostgreSQL models.

Why: Contract-first collaboration. Frontend mocks already align with these shapes — no retcon needed. Socrates cleared for duty.

Files:
- /home/hoffmann_admin/.openclaw/shared/build-20260501/docs/contract.md — Source of truth (v0.2)
- /home/hoffmann_admin/.openclaw/shared/build-20260501/SPEC.md — Integration spec
- /home/hoffmann_admin/.openclaw/shared/build-20260501/backend/ — Write your code here

Contract Summary:
- 5 Pydantic Schemas: Tenant/School, Athlete, Case, Milestone, Event
- 4 GET endpoints: roster, cases, timeline, milestones
- 1 POST endpoint: sideline-entry (3-tap rapid entry)
- Key constraints:
- school_id on every model (multi-tenant)
- severity (clinical, static) ≠ attention_level (operational, daily)
- clearance_granted event closes case (reopenable within 30 days)
- visibility defaults ["at"] — AT must explicitly expand
- clinical_notes stripped server-side for non-AT roles
- current_status cached on Athlete — update via DB trigger

Success Criteria:
- All 5 schemas validate correctly with Pydantic v2
- All endpoints return correct shapes per contract
- FERPA gate strips clinical_notes for coach/parent roles
- current_status updates via DB trigger or transaction hook
- PostgreSQL tables with proper indexing on school_id

ETA: TBD — provide your own after review

Coordination:
- Read shared/build-20260501/SPEC.md for integration context
- Update shared/build-20260501/integration.md with progress
- Frontend mocks are already aligned — no breaking changes expected