Clear Artist Photo cache?

[acroyear]

It seems that last.fm moved some images around (or totally changed their url syntax), such that, at least in 6.0b2, many artist photos are coming up as the empty image thing, and a right-click open in new tab results in a JSON result of "{"status":"error: image not found","code":404}".

Is there any easy way, either through the SQL view, or by wiping some folder, to clear the cached artist photos list so it fetches their urls anew from last.fm?

Thanks,
Joe