Let's say an end-user connects to a Relay with a token that expires in 60 minutes. What I understand is that, if the user emits a SUBSCRIBE 65 minutes later, then the Relay will reject the request. However, if the user sends a SUBSCRIBE to a track immediately after the connection, it got the stream. 60 minutes later, should the Relay abruptly stop the track delivery? It would require the Relay to keep trace of the finishing time of each ongoing track.