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dbPromise.then(function(db) {
  var tx = db.transaction('store', 'readwrite');
  var store = tx.objectStore('store');
  var item = {
    name: 'sandwich',
    price: 4.99,
    description: 'A very tasty sandwich',
    created: new Date().getTime()
  };
  store.add(item);
  return tx.complete;
}).then(function() {
  console.log('added item to the store os!');
});