SMG Quarantine broken, how to fix?


A few days ago I realized SMG is no longer filtering my mails (MTA scanner). A quick check revealed that the vastorage disk was full, So I downed SMG, expanded the disk, and restarted everything,

Now SMG is working, but the quarantine is inaccessible, which obviously is a problem. Inaccessible means, when I login (as admin) everything's shown empty. I also realize, that attempting to access the quarantine immediately causes high utilization on the SMG appliance. Also, logging out of the quarantine takes a very long time.

Is there any potential procedure to fix this, or if all else fails, reset the quarantine to start from scratch (other than of course to deploy a new appliance)?