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1. alertname IS NULL（4 筆歷史修復 + code fallback）
- incident_repository.py: alertname 補 labels["alertname"] fallback
- SQL UPDATE: 用 signals->0->>'alert_name' 修補存量 4 筆 NULL 記錄
2. TYPE-1 incidents 永遠卡 INVESTIGATING（18 筆修復 + code fix）
- webhooks.py: TYPE-1 短路後立即加 resolve_incident background task
- SQL UPDATE: 批次將存量 TYPE-1 INVESTIGATING → RESOLVED
根因: ADR-073 TYPE-1 短路設計只發通知，未關閉 incident 狀態
backup/heartbeat 告警每小時觸發 → 無限累積 INVESTIGATING 記錄
2026-04-15 ogt + Claude Sonnet 4.6（亞太）
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>