code: function listAppliedChangeSinceLastSync(datasetId, lastSyncEndTime, clientInfo, cb) {
    syncStorage.listUpdates(datasetId, {
      type: SYNC_UPDATE_TYPES.APPLIED,
      cuid: clientInfo.cuid,
      timestamp: {$gt: lastSyncEndTime}
    }, null, cb);
  }
docs: List the applied changes since the last sync loop for the given client
  @param {String} datasetId the id of the dataset
  @param {Number} lastSyncEndTime the timestamp of when the last sync loop completed
  @param {Object} clientInfo the client info. Should contain the cuid
  @param {Function} cb