var mongoose = require('mongoose');

var userSchema = new mongoose.Schema({
  linkHash : String,
  senderID : String,
  receiverID : Number,
  created_at : Array
});
@@ -158,8 +158,62 @@
 rray%0A%7D);
+%0A%0Amodule.exports = mongoose.model('User', userSchema);

Refactor user schema with kcvan in user_schema.js