fix(tests): stabilize escalation SSE backend tests

Co-Authored-By: Codex <noreply@openai.com>

backend/tests/test_escalation_bus.py

@@ -68,6 +68,21 @@ async def test_subscriber_in_other_account_does_not_receive():
         await bus.unsubscribe(account_b, q_b)
 
 
+@pytest.mark.asyncio
+async def test_publish_normalizes_string_uuid_account_id():
+    """ORM-created objects can briefly carry string UUIDs in-memory."""
+    bus = EscalationBus()
+    account = uuid4()
+    queue = await bus.subscribe(account)
+    try:
+        delivered = await bus.publish(str(account), {"type": "x"})
+        assert delivered == 1
+        event = await asyncio.wait_for(queue.get(), timeout=1.0)
+        assert event == {"type": "x"}
+    finally:
+        await bus.unsubscribe(str(account), queue)
+
+
 @pytest.mark.asyncio
 async def test_unsubscribe_drops_subscriber_count_to_zero():
     bus = EscalationBus()