diff --git a/apps/api/src/main.py b/apps/api/src/main.py
index 5a86089a..28928a8d 100644
--- a/apps/api/src/main.py
+++ b/apps/api/src/main.py
@@ -276,6 +276,9 @@ async def lifespan(_app: FastAPI) -> AsyncGenerator[None, None]:
                     closed_at=record.closed_at,
                     ttl_days=record.ttl_days,
                     vectorized=record.vectorized,
+                    # ADR-073: 分類欄位必須還原，否則 KM 寫入時全為 "unknown"
+                    notification_type=record.notification_type,
+                    alert_category=record.alert_category,
                 )
                 if await incident_service.save_to_working_memory(incident):
                     restored += 1
diff --git a/apps/api/src/services/approval_execution.py b/apps/api/src/services/approval_execution.py
index 4a45f362..e0ddb8ac 100644
--- a/apps/api/src/services/approval_execution.py
+++ b/apps/api/src/services/approval_execution.py
@@ -628,7 +628,11 @@ class ApprovalExecutionService:
             if approval.incident_id:
                 try:
                     from src.services.incident_service import get_incident_service
-                    _inc = await get_incident_service().get_incident(approval.incident_id)
+                    _svc = get_incident_service()
+                    # get_from_working_memory (Redis) → fallback get_from_episodic_memory (PG)
+                    _inc = await _svc.get_from_working_memory(approval.incident_id)
+                    if _inc is None:
+                        _inc = await _svc.get_from_episodic_memory(approval.incident_id)
                     if _inc:
                         if _inc.signals:
                             alertname = _inc.signals[0].labels.get("alertname", "unknown") or "unknown"
diff --git a/apps/api/src/services/incident_service.py b/apps/api/src/services/incident_service.py
index 5b176a49..faa81a16 100644
--- a/apps/api/src/services/incident_service.py
+++ b/apps/api/src/services/incident_service.py
@@ -680,6 +680,9 @@ class IncidentService:
             ttl_days=record.ttl_days,
             persisted_to_pg=True,  # 從 PG 讀取，必為 True
             vectorized=record.vectorized,
+            # ADR-073: 分類欄位必須從 DB 還原，否則 KM 寫入時全為 "unknown"
+            notification_type=record.notification_type,
+            alert_category=record.alert_category,
         )
 
     # =========================================================================