fix(aiops): preserve alert identity in degraded diagnosis

apps/api/src/repositories/approval_repository.py

@@ -16,7 +16,7 @@ from typing import Any
 from uuid import UUID
 
 import structlog
-from sqlalchemy import select
+from sqlalchemy import select, update
 
 from src.db.base import get_db_context
 from src.db.models import ApprovalRecord
@@ -106,8 +106,6 @@ def _record_to_request(record: ApprovalRecord) -> ApprovalRequest:
         # B4 fix 2026-04-24 ogt + Claude Sonnet 4.6: 補回 DB 欄位（人工審核路徑讀回必要）
         incident_id=getattr(record, "incident_id", None),
         matched_playbook_id=getattr(record, "matched_playbook_id", None),
-        telegram_message_id=getattr(record, "telegram_message_id", None),
-        telegram_chat_id=getattr(record, "telegram_chat_id", None),
     )
 
 
@@ -153,7 +151,15 @@ class ApprovalDBRepository(IApprovalRepository):
 
     async def get_pending(self) -> list[ApprovalRequest]:
         """取得所有待審核的 Approval"""
+        now = datetime.now(UTC)
         async with get_db_context() as db:
+            await db.execute(
+                update(ApprovalRecord)
+                .where(ApprovalRecord.status == ApprovalStatus.PENDING)
+                .where(ApprovalRecord.expires_at < now)
+                .values(status=ApprovalStatus.EXPIRED, resolved_at=now)
+            )
+
             result = await db.execute(
                 select(ApprovalRecord)
                 .where(ApprovalRecord.status == ApprovalStatus.PENDING)