Issue 469 default exchange setting websocket message

[BartStolarek]

These changes:

1. Properly handle process termination
2. Clean up Redis subscriptions
3. Handle websocket disconnections more gracefully
4. Ensure all resources are properly released
5. Prevent the flood of error messages when closing tabs

The key improvement is that we're now handling the entire cleanup process systematically, ensuring that both the process and its associated resources (Redis subscriptions, websocket connections) are properly terminated.

Testing has not happened

[saleh-mir]

Hey man, thank you for submitting this. What do you mean testing has not happened?

Also, may I ask how you wrote this? This is a very sensitive part of the source code. The AI return code for this type of thing looks very promising, but sometimes it breaks everything.