@Override
 protected boolean deleteAllImpl(RepositoryModel repository) {
   Repository db = repositoryManager.getRepository(repository.name);
   try {
     RefModel branch = getTicketsBranch(db);
     if (branch != null) {
       return JGitUtils.deleteBranchRef(db, BRANCH);
     }
     return true;
   } catch (Exception e) {
     log.error(null, e);
   } finally {
     if (db != null) {
       db.close();
     }
   }
   return false;
 }