We test a few dummy coins whenever we have to cycle the servers and the last tests worked. 

If particular coins are working and others are not then its a database issue and that's what we're trying to track down now.

The site may be down entirely for a few minutes at a time this week while we do some deeper maintenance efforts but if we run into a scenario where its going to be down for longer than an hour or so, I'll reroute traffic to a cloned version of the servers via DNS to keep some version live for checking coins.