M25: expose provenance-aware knowledge statistics

backend/app/api/routers/knowledge.py

@@ -100,6 +100,30 @@ def record_feedback(
 @router.get("/status", response_model=KnowledgeHealth)
 def knowledge_status(
     language: SupportedLanguage = "en-GB",
+    db: Session = Depends(get_db),
     _user: CurrentUser = Depends(get_current_user),
 ) -> KnowledgeHealth:
-    return get_knowledge_provider().health(language)
+    health = get_knowledge_provider().health(language)
+    if health.provider != "ragcore":
+        return health
+
+    latest_sync = db.scalar(
+        select(AuditEvent)
+        .where(AuditEvent.action == "n8n_procedures_synced")
+        .order_by(AuditEvent.occurred_at.desc())
+        .limit(1)
+    )
+    if latest_sync is None:
+        return health
+
+    reported = latest_sync.after_json or {}
+    synced = reported.get("synced")
+    failed = reported.get("failed")
+    return health.model_copy(
+        update={
+            "reported_synced_document_count": synced if isinstance(synced, int) else None,
+            "reported_failed_document_count": failed if isinstance(failed, int) else None,
+            "last_sync_at": latest_sync.occurred_at,
+            "statistics_state": "sync_reported",
+        }
+    )