I was trying to do a svn cleanup because I can\'t commit the changes in my working copy, and I got the following error:
sqllite: databas
Have you seen this post on the subversion site? You could also potentially try validating and "fixing" the database directly as described here. (Note that I'm no expert, I just did a quick google search. May not be related to your issues at all).
Personally, I'd try checking out the repo again and reapplying your changes. Not sure if this is possible though in your case?