Congratulations on wiping out half of the RoboRumble
No worries, the pairings should still be there, just hidden, for the next 14 days. All bots need 1 battle again, and then each will need another battle once all the bots are all back in the rumble to reprocess their results. This should be fixed fairly quickly.
Once its stable again I'll do another backup, since it's been quite a while...