public void store(Project project, Revision newRevision, TextChunkList authorship) {
   withLock(
       newRevision.getId(), () -> revisionAuthorshipDao.store(project, newRevision, authorship));
 }
 public RevisionAuthorship findByRevision(Project project, Long newRevisionId) {
   return withLock(
       newRevisionId, () -> revisionAuthorshipDao.findByRevision(project, newRevisionId));
 }