[Dirvish] Help fixing a broken vault (deleted the latest backup)

[Bradley Lawrence]

I was cleaning up my dirvish vault because I had run out of space on the 
backup drive. I deleted some of the oldest backups that were laying 
around. Also, figuring the latest backup attempt had probably died 
partway due to running out of space, I deleted that directory too. But 
now dirvish complains:

behemoth:default:20061121: ERROR: no images for branch default found

Even though there are definitely full, complete backup images there... 
is it possible to repair my dirvish vault do you think? I'd like to 
avoid having to toast everything and re-initialize.

Also, what is the "proper" way to delete images on a one-off basis? My 
expiry policy generally works well, but there has been a lot changing on 
the drive recently, resulting in abnormally high growth, which is why I 
had to go in and clean some stuff out... it seems I did it wrong.