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* Modify conversation_id index options Removed the unique constraint from the conversation_id index. * fix(msggateway): reset read deadline in pong handler to prevent Web client timeout Root cause: Due to browser API restrictions, Web (Wasm) clients cannot actively send standard WebSocket Ping frames. They rely entirely on server-initiated Pings (every 27s) and automatic browser Pong responses to maintain the connection. The `pongHandler` was empty and failed to reset the connection's read deadline upon receiving a Pong, causing the server's read loop to strictly time out at 30 seconds. Solution: Call `c.setReadDeadline()` inside the `pongHandler` to properly extend the connection's lifespan when a Pong frame is received. --------- Co-authored-by: OpenIM-Gordon <1432970085@qq.com>