fix: manage WebRTC pipeline shutdown

backend/tests/test_conversation_history.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import asyncio
 import unittest
 from types import SimpleNamespace
 from unittest.mock import AsyncMock, patch
@@ -8,6 +9,30 @@ from services.conversation_history import ConversationRecorder
 
 
 class ConversationRecorderTest(unittest.IsolatedAsyncioTestCase):
+    async def test_finish_waits_for_database_cleanup_when_cancelled(self):
+        recorder = ConversationRecorder("conv_test")
+        started = asyncio.Event()
+        release = asyncio.Event()
+        completed = asyncio.Event()
+
+        async def finish_database_write(*, status: str):
+            self.assertEqual(status, "failed")
+            started.set()
+            await release.wait()
+            completed.set()
+
+        recorder._finish = finish_database_write
+        task = asyncio.create_task(recorder.finish(status="failed"))
+        await started.wait()
+        task.cancel()
+        await asyncio.sleep(0)
+
+        self.assertFalse(task.done())
+        release.set()
+        with self.assertRaises(asyncio.CancelledError):
+            await task
+        self.assertTrue(completed.is_set())
+
     async def test_fixed_reply_transcript_keeps_workflow_metadata(self):
         recorder = ConversationRecorder("conv_test")
         recorder._append = AsyncMock()