docs: private JpaDistributionSet touch(final DistributionSet ds) {
  
          // merge base distribution set so optLockRevision gets updated and audit
          // log written because modifying metadata is modifying the base
          // distribution set itself for auditing purposes.
          final JpaDistributionSet result = entityManager.merge((JpaDistributionSet) ds);
          result.setLastModifiedAt(0L);
  
          return distributionSetRepository.save(result);
      }