lib/sync-scheduler.js
function updateDatasetClients(wcb) {
          var datasetClientIds = _.pluck(datasetClientsToSync, 'id');
          syncStorage.updateManyDatasetClients({id: {$in: datasetClientIds}}, {syncScheduled: Date.now()}, wcb);
        }
function updateDatasetClients(wcb) {
          var datasetClientIds = _.pluck(datasetClientsToSync, 'id');
          syncStorage.updateManyDatasetClients({id: {$in: datasetClientIds}}, {syncScheduled: Date.now()}, wcb);
        }
make sure each dataset client is marked to be scheduled