Believe it or not, I know exactly when this happened and why. We had a big disk array failure and (a) our UI did not know how to recover and (b) disk snapshots

Believe it or not, I know exactly when this happened and why. We had a big disk array failure and (a) our UI did not know how to recover and (b) disk snapshots timed out before many people knew their disks were gone. This is one of those instances where an unmanaged single node Postgres sucks to use.