Create app/broker.py

app/broker.py

@@ -0,0 +1,16 @@
+"""
+A singleton message broker for the application.
+
+This ensures that the same asyncio.Queue instance is shared across all parts
+of the application, including background tasks and API request handlers,
+solving state-sharing issues in ASGI lifecycles.
+"""
+import asyncio
+
+class SignalBroker:
+    def __init__(self):
+        self.queue = asyncio.Queue()
+
+# Create a single, global instance of the broker.
+# When any file imports 'signal_broker', they will get this exact same object.
+signal_broker = SignalBroker()