Avoid initializing the SQLite DB during tests by checking the TESTING env var in app.lifespan and logging accordingly. Add scripts/reset_db.py to remove and re-create the DB file for fresh state during development/benchmarks. Update tests: conftest sets TESTING=true and test_api uses a shared client fixture instead of creating TestClient per test. Update results.json sample data (IDs and durations) as part of test/sample data refresh.
