docs: function iface(end) {
      if (end) {
        return db.quit(next);
      } else {
        // Get all the domains whose records expired some time before now
        db.eval(scoreRange,2,'expiring_domains','querying_domains',
          '-inf', Date.now(), function (err, res) {
            if (err) return cb(err);
            // Query each of these domains
            for (var i = 0; i < res.length; i += 2) {
              queryDomain(res[i], finishQuerying.bind(null, res[i]));
            }
          });
        return iface;
      }
    }