How to permanently erase files from trac's repository browser

I don't know what's going on with the trac svn, but if you want to erase it completely on the svn, the server needs to use the svnadmin command to return it to any revision.
http://ftvoid.com/blog/post/113

If you are not managing trac yourself, please consult your trac administrator.
With this method, backup and re-creation of repositories will be a good thing, so I don't recommend it very much.

If you can only operate from the client side, delete the unnecessary files (svnrm) and commit again.
The history will get dirty, but it's not good if unnecessary files remain in the repository...