var delay = 0;
return categories.reduce(function(promise, category) {
  delay += 1;
  return new Promise(function(resolve, reject) {
    var actualDelay = delay;
    setTimeout(function() {
      var result = promise.then(function() {
        return client.itemSearch({}).then(function(results) {
          return db.insertProduct(...results);
        });
      }).catch(console.log.bind(console, 'error'));
      resolve(result);
    }, actualDelay * 1000);
  });
}, Promise.resolve());
 

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