fix: models.py KnowledgeBase indentation + verify Phase 2.4 KB API

backend/python/app/models.py

@@ -164,7 +164,7 @@ class KnowledgeBase(Base):
     document_count = Column(Integer, default=0)
     knowledge_graph_count = Column(Integer, default=0)
     created_at = Column(DateTime, default=datetime.now)
-        updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now)
+    updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now)
     is_official = Column(Boolean, default=False)
     status = Column(String(20), default="active")
     external_service_id = Column(String(36), default=None)