I wrote a script one day that I used to repair some errors in the node tree caused by an extension. It's been a while ago so I'I don't know exactly anymore what it did.
If you want I can take a look at it and I'll see if it could be useful for others. Maybe we should bundle our forces and write some scripts that test for errors in the content tree. This also could be useful to check if new extensions work like they should.
