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feat(phase-7-backend): implement anomaly detection — SuspensionFlip detector, use case, poller, and tests

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- AnomalyDetector (pure domain): detects odds-flip pattern from live snapshot
  timelines using implied-probability vectors (p=1/rate, normalised), flip score
  = max(|p_post−p_pre|), gated by both threshold AND favourite-changed test
- SuspensionInterval record: typed pair of (pre, post) OddsSnapshot bracketing a gap
- AnomalyOptions POCO (Application layer): bound to Anomaly:* config section with
  four fields (SuspensionGapSeconds=60, OddsFlipThreshold=0.30, MinSnapshotCount=3,
  DetectionIntervalSeconds=60)
- DetectAnomaliesUseCase: iterates all events, loads last-24h live snapshots, runs
  detector, persists new anomalies with 1-minute dedup window
- AnomalyDetectionPoller: BackgroundService polling every DetectionIntervalSeconds,
  gated by WorkerOptions.AnomalyDetectionEnabled (default true)
- DI wiring: DetectAnomaliesUseCase registered Scoped in ApplicationModule;
  AnomalyOptions bound + AnomalyDetectionPoller hosted in InfrastructureModule
- WorkerOptions.AnomalyDetectionEnabled added; appsettings.json updated
- 13 domain tests + 4 application tests; total 245/245 passing (no regression)
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2026-05-05 13:15:50 +03:00
parent d915667da1
commit a6ff368015
14 changed files with 1411 additions and 34 deletions
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plans/initial-implementation/PLAN.md
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@@ -69,7 +69,7 @@ parameter configurable.
| Phase 4: Application + Workers | backend | ✅ Done | ⚠️ Pass with notes (Sonnet) | ✅ Build OK + 202/202 tests | ✅ 2acbaa5 |
| Phase 5: Host + Theme + i18n | frontend | ✅ Done | ⚠️ Pass with notes (Sonnet, combined batch) | ✅ Build OK + 11/11 UI tests | ✅ batch (e4d8476…686550d…+) |
| Phase 6: Event browsing UI | frontend | ✅ Done | ⚠️ Pass with notes (Sonnet) | ✅ Build OK + 228/228 tests | ✅ 553db2b |
| Phase 7: Anomaly detection | fullstack | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
| Phase 7: Anomaly detection | fullstack | 🔨 Backend done | ⬜ | ✅ Build OK + 245/245 tests | ⬜ |
| Phase 8: Results loader | fullstack | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
| Phase 9: Packaging + polish | fullstack | ⬜ Not Started | ⬜ | ⬜ | ⬜ |