Handle mysql timeouts

[felixge]

Detect stale connections and automatically re-connect.

[CrabDude]

If anyone else runs into this problem, this is a good stopgap:

// Reconnect every 5 minutes
// I believe default mysql-timeout is 10 minutes
setInterval(function() {
    client.end();
    client.connect();
}, 300000);

[felixge]

The client will now automatically reconnect whenever a connection ends that was not supposed to be ending. This should fix this issue for most parts.

See: 81edd83

I might spend some more time on implementing exponential backoff and things like that.

[sigMacity]

First, thank you for all your efforts.

Just wondering, is exponential backoff on the roadmap. Various cloud providers are recommending it as a recovery strategy.