First pass: for some workflowGuids, only some of the locales have a parkedId, due to various catch-22's. Give them all a parkedId.
function crossCorrectPass(callback) {
      return async.series([ find, correct ], callback);
      function find(callback) {
        return self.apos.docs.db.findWithProjection({ parkedId: { $exists: 1 } }).toArray(function(err, _pages) {
          if (err) {
            return callback(err);
          }
          pages = _pages;
          return callback(null);
        });
      }
      function correct(callback) {
        var parkedIdsByWorkflowGuid = {};
        _.each(pages, function(page) {
          parkedIdsByWorkflowGuid[page.workflowGuid] = page.parkedId;
        });
        return async.eachSeries(_.keys(parkedIdsByWorkflowGuid), function(workflowGuid, callback) {
          return self.apos.docs.db.update({
            workflowGuid: workflowGuid
          }, {
            $set: {
              parkedId: parkedIdsByWorkflowGuid[workflowGuid]
            }
          }, {
            multi: true
          }, callback);
        }, callback);
      }
    }