- 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
- Add max_api_tokens_per_user config (default 5)
- Implement POST /api/tokens (T41): generate token with limit check
- Implement GET /api/tokens (T42): list active tokens, no values exposed
- Implement DELETE /api/tokens/{id} (T43): soft delete with ownership check
- Security: plaintext token shown ONLY at creation
- Security: SHA-256 hash stored in DB, never the plaintext
- Security: revoked tokens return 401 on public API
- 24 tests with 100% coverage on tokens router
Closes T41, T42, T43
- Create config.py with Pydantic Settings (SettingsConfigDict v2)
- Add all required configuration fields with defaults
- Create .env.example template with all environment variables
- Implement get_settings() with @lru_cache for performance
- Add test_configuration.py with 13 unit tests
- All tests passing (13/13)
Refs: T04
