Add Ticker24h support: hourly market snapshots with USD-normalized volume filtering

sandbox/main.py

@@ -1472,6 +1472,7 @@ class UserContainer:
         self.data_api: Optional[DataAPIImpl] = None
         self.event_bridge: Optional[StrategyEventBridge] = None
         self.running = False
+        self._uvicorn_server: Optional["uvicorn.Server"] = None
 
     async def start(self) -> None:
         """Start all subsystems"""
@@ -1642,6 +1643,7 @@ class UserContainer:
                     access_log=True,
                 )
                 server = uvicorn.Server(config)
+                self._uvicorn_server = server
                 await server.serve()
             else:
                 raise ValueError(f"Unknown MCP transport: {self.config.mcp_transport}")
@@ -1670,9 +1672,11 @@ async def main():
     loop = asyncio.get_event_loop()
 
     def handle_signal(sig):
-        logging.info(f"Received signal {sig}, shutting down...")
-        asyncio.create_task(container.stop())
-        loop.stop()
+        logging.info(f"Received signal {sig}, initiating graceful shutdown...")
+        if container._uvicorn_server is not None:
+            container._uvicorn_server.should_exit = True
+        else:
+            loop.stop()
 
     for sig in (signal.SIGTERM, signal.SIGINT):
         loop.add_signal_handler(sig, lambda s=sig: handle_signal(s))