Last night the EMC storage system (a half-rack full of hard disks, connected to the database server with Fibre Channel) where the aprs.fi database is stored, has returned some corrupted data, and the ZFS filesystem has detected checksum errors. As a result, the database is now down, and I'm restoring a backup copy. This takes some time, as the database is rather large. The service should be back up later today.
This sucks. Seems I really need to set up online data replication to another database machine. As long as the database is down, no APRS-IS data is stored.
Sorry for the trouble!