Merge pull request #705 from nitsujlangston/addEmailQueueIdIndex

adding needed index for email_queue.id

lib/storage.js

@@ -64,6 +64,9 @@ Storage.prototype._createIndexes = function() {
   this.db.collection(collections.ADDRESSES).createIndex({
     address: 1,
   });
+  this.db.collection(collections.EMAIL_QUEUE).createIndex({
+    id: 1,
+  });
   this.db.collection(collections.EMAIL_QUEUE).createIndex({
     notificationId: 1,
   });