The cause of the failure is unknown as of yet, but at 16:23:59 our SQL database server simply froze up. In the half-dozen years that this server has been online, this has (as best I recall) never happened before. The restart at midnight, when we returned from the event and noticed the problem, was uneventful. No data was lost (in any case, we have very up-to-date backups).
In a for-profit environment, there are ways of automatically notifying administrators of things like this. We've never set something like that up for SCAtoday.net, because it's not a commercial site. I may look at doing some kind of auto-paging system in the future, however.
Again, we apologize for any inconvenience.