fix: improve maintenance and synchronize live conversations

backend/tests/tools/test_knowledge_search_byagent.py

@@ -108,7 +108,6 @@ def knowledge_search_tool(mock_db, mock_knowledge, mock_vector_db, mock_agent_kn
         tool.agent_knowledge = mock_agent_knowledge
         
         # Create a patched version of search_knowledge_base that doesn't depend on database
-        original_search = tool.search_knowledge_base
         
         def patched_search_knowledge_base(query):
             try:
@@ -512,7 +511,7 @@ def test_real_search_knowledge_base_with_source_filter():
         mock_agent_knowledge_class.return_value = mock_agent_knowledge
 
         # Execute search
-        result = tool.search_knowledge_base("test query")
+        tool.search_knowledge_base("test query")
 
         # Verify source filter was applied
         search_call = mock_agent_knowledge.search.call_args