feat: unify debug runtime timelines

backend/tests/test_conversation_history.py

@@ -144,6 +144,22 @@ class ConversationRecorderTest(unittest.IsolatedAsyncioTestCase):
         self.assertEqual(saved["sessionId"], "conv_test")
         self.assertEqual(saved["sequence"], 1)
 
+    async def test_internal_message_stage_transport_trace_is_not_persisted_twice(self):
+        recorder = ConversationRecorder("conv_test")
+        event = {
+            "type": "workflow-event",
+            "eventId": "wfe_internal",
+            "event": "client_tool_completed",
+            "functionName": "show_message",
+            "internalStage": True,
+        }
+
+        with patch("services.conversation_history.SessionLocal") as session_local:
+            await recorder.record_transport_message(event)
+
+        session_local.assert_not_called()
+        self.assertEqual(recorder._trace_sequence, 0)
+
     async def test_image_is_persisted_as_message_with_artifact(self):
         conversation = SimpleNamespace(message_count=0)