- T55: Setup APScheduler with AsyncIOScheduler and @scheduled_job decorator
- T56: Implement hourly usage stats sync from OpenRouter API
- T57: Implement daily API key validation job
- T58: Implement weekly cleanup job for old usage stats
- Add usage_stats_retention_days config option
- Integrate scheduler with FastAPI lifespan events
- Add 26 unit tests for scheduler, sync, and cleanup tasks
- Add apscheduler to requirements.txt
The background tasks now automatically:
- Sync usage stats every hour from OpenRouter
- Validate API keys daily at 2 AM UTC
- Clean up old data weekly on Sunday at 3 AM UTC
- T24: POST /api/keys with encryption and limit validation
- T25: GET /api/keys with pagination and sorting
- T26: PUT /api/keys/{id} for partial updates
- T27: DELETE /api/keys/{id} with cascade
- Add ownership verification (403 for unauthorized access)
- API key encryption with AES-256 before storage
- Never expose API key value in responses
- 100% coverage on api_keys router (25 tests)
Refs: T24 T25 T26 T27
