diff --git a/apps/api/src/api/v1/webhooks.py b/apps/api/src/api/v1/webhooks.py
index 7b031d8c..01e0c6b5 100644
--- a/apps/api/src/api/v1/webhooks.py
+++ b/apps/api/src/api/v1/webhooks.py
@@ -207,6 +207,25 @@ async def _try_auto_repair_background(
                 },
             )
 
+        # ADR-073 Phase 2-3: 自動修復結果 → 寫入 Incident outcome (2026-04-12 ogt)
+        # 讓 KMConversionService 可依 outcome 判斷是否為 EXECUTION_SUCCESS
+        if result:
+            _effectiveness = 5 if result.success else 2
+            _feedback = (
+                f"auto_repair:{result.playbook_id}:success"
+                if result.success
+                else f"auto_repair:{result.playbook_id}:failed:{result.error}"
+            )
+            try:
+                await incident_service.update_outcome(
+                    incident_id=incident_id,
+                    effectiveness_score=_effectiveness,
+                    human_feedback=_feedback,
+                    should_remember=result.success,
+                )
+            except Exception as _outcome_err:
+                logger.warning("auto_repair_outcome_write_failed", error=str(_outcome_err))
+
         # 2026-04-10 Claude Sonnet 4.6 Asia/Taipei: 自動修復後更新 Telegram 卡片
         # 透過 TelegramGateway Service 層移除按鈕並回覆結果 (積木化鐵律)
         if result:
diff --git a/scripts/backfill_alertname.py b/scripts/backfill_alertname.py
new file mode 100644
index 00000000..f2669270
--- /dev/null
+++ b/scripts/backfill_alertname.py
@@ -0,0 +1,55 @@
+"""
+ADR-073 Phase 2-5: 回填 incidents.alertname 欄位
+2026-04-12 ogt: 舊資料 signals JSONB 用 alert_name key (非 alertname alias)
+                新資料 (Phase 2-1 修復後) 已有 alertname alias
+
+執行方式:
+    kubectl exec -n awoooi-prod <api-pod> -- python3 scripts/backfill_alertname.py
+"""
+import asyncio
+import sys
+sys.path.insert(0, "/app")
+
+from sqlalchemy import text
+
+from src.db.base import get_db_context
+
+
+async def main() -> None:
+    async with get_db_context() as db:
+        # 先查有多少需要回填
+        count_r = await db.execute(
+            text("SELECT COUNT(*) FROM incidents WHERE alertname IS NULL")
+        )
+        total = count_r.scalar()
+        print(f"待回填: {total} 筆")
+
+        # 優先用 signals->0->>'alertname' (Phase 2-1 修復後的新寫法)
+        # fallback: signals->0->>'alert_name' (舊寫法)
+        result = await db.execute(
+            text("""
+                UPDATE incidents
+                SET alertname = COALESCE(
+                    signals->0->>'alertname',
+                    signals->0->>'alert_name'
+                )
+                WHERE alertname IS NULL
+                  AND (
+                    signals->0->>'alertname' IS NOT NULL
+                    OR signals->0->>'alert_name' IS NOT NULL
+                  )
+            """)
+        )
+        await db.commit()
+        print(f"已回填: {result.rowcount} 筆")
+
+        # 剩餘無法回填的
+        remain_r = await db.execute(
+            text("SELECT COUNT(*) FROM incidents WHERE alertname IS NULL")
+        )
+        remain = remain_r.scalar()
+        print(f"仍為 NULL: {remain} 筆 (signals 無 alert_name 欄位，無法回填)")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())