PHASE1-B-1: FastAPI REST API Implementation (Track B)

[ChandrimaGanguly]

Owner: Jodha (FastAPI Backend Expert)
Duration: 2 days (depends on PHASE1-A-1.1 models)
Status: Ready (after Day 2 of database work)

Subtasks

• PHASE1-B-1.1 - Create FastAPI instance + config
• PHASE1-B-1.2 - Create 6 route modules (health, webhook, practice, student, streak, admin)
• PHASE1-B-1.3 - Implement middleware (CORS, request ID, error handlers)
• PHASE1-B-1.4 - Database integration (session dependency)
• PHASE1-B-1.5 - Unit tests (≥70% coverage)
• PHASE1-B-1.6 - Code review security work from Noor

Deliverables

Create FastAPI app with all 12 REST endpoints:

• health.py: GET /health

• webhook.py: POST /webhook

• practice.py: GET /practice, POST /answer, POST /hint

• student.py: GET /profile, PATCH /profile

• streak.py: GET /streak

• admin.py: GET /stats, GET /students, GET /cost

• FastAPI app initialization with environment config

• Pydantic request/response schemas

• Database session dependency injection

• Error handling middleware

• Unit tests with 70%+ coverage

Success Criteria

• ✅ All endpoints return correct HTTP status codes
• ✅ Request/response types validated with Pydantic
• ✅ All database calls use async/await correctly
• ✅ MyPy strict type checking passes
• ✅ 70%+ test coverage
• ✅ All tests pass

References

• PHASE1_TASKS.md (Agent B)
• API_ARCHITECTURE.md (REST contract)
• Depends on: PHASE1-A-1 (models)
• Blocks: PHASE1-C-1.6 (Noor needs complete API for security review)