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ServiceDataHarness (services/service_data.py): lifecycle-only registry of per-concern storage — DB provisioning, idempotent migrations (ALTER TABLE duplicate-column-name caught per-statement), cascade_delete(service_id). QbittorrentSampleStore: append/window/prune (MAX_SAMPLES=120) in qbittorrent.db. QbittorrentClient: cookie-login Web API client (403 re-login, /sync/maindata). Integration registered with 3 widget kinds (totals/active/ speed). Harness initialized in main.py lifespan. Backend: 314 pytest pass (21 new), ruff clean.