fix: recover bgp anomaly and incident generation

backend/app/services/collectors/bgp_common.py

@@ -293,6 +293,12 @@ async def create_bgp_anomalies_for_batch(
         )
     )
     existing_keys = {row[0] for row in existing_result.fetchall()}
+    existing_anomalies: list[BGPAnomaly] = []
+    if existing_keys:
+        existing_anomaly_result = await db.execute(
+            select(BGPAnomaly).where(BGPAnomaly.entity_key.in_(sorted(existing_keys)))
+        )
+        existing_anomalies = existing_anomaly_result.scalars().all()
 
     created = 0
     created_anomalies: list[BGPAnomaly] = []
@@ -305,11 +311,13 @@ async def create_bgp_anomalies_for_batch(
 
     if created:
         await db.commit()
+    incident_seed_anomalies = [*created_anomalies, *existing_anomalies]
+    if incident_seed_anomalies:
         await create_bgp_incidents_for_anomalies(
             db,
             source=source,
             snapshot_id=snapshot_id,
             task_id=task_id,
-            anomalies=created_anomalies,
+            anomalies=incident_seed_anomalies,
         )
     return created