--- a
+++ b/scripts/migrations/028-remove-svn-trees.py
@@ -0,0 +1,36 @@
+import logging
+
+from ming.orm import ThreadLocalORMSession
+
+from allura.lib import utils
+from allura import model as M
+from forgesvn import model as SM
+
+log = logging.getLogger(__name__)
+
+def kill_tree(repo, commit_id, path, tree):
+    '''They were arboring terrorists, I swear.'''
+    M.repo.Tree.query.remove(dict(_id=tree._id))
+    for tree_rec in tree.tree_ids:
+        tid = repo._tree_oid(commit_id, path + '/' + tree_rec.name)
+        child_tree = M.repo.Tree.query.get(_id=tid)
+        if child_tree:
+            print '  Found {0}'.format((path + '/' + tree_rec.name).encode('utf8'))
+            kill_tree(repo, commit_id, path + '/' + tree_rec.name, child_tree)
+        else:
+            print '  Missing {0}'.format((path + '/' + tree_rec.name).encode('utf8'))
+
+def main():
+    for chunk in utils.chunked_find(SM.Repository):
+        for r in chunk:
+            print 'Processing {0}'.format(r)
+            all_commit_ids = r._impl.all_commit_ids()
+            if all_commit_ids:
+                for commit in M.repo.Commit.query.find({'_id':{'$in':all_commit_ids}}):
+                    if commit.tree_id and M.repo.Tree.query.get(_id=commit.tree_id):
+                        kill_tree(r._impl, commit._id, '', commit.tree)
+                ThreadLocalORMSession.flush_all()
+                ThreadLocalORMSession.close_all()
+
+if __name__ == '__main__':
+    main()