private void UpdateProphecies()
        {
            var prophecies = PoeNinjaApi.GetProphecies();

            foreach (var prophecy in prophecies)
            {
                var dbProphecy = Context.Prophecies.SingleOrDefault(p => p.InGameId == prophecy.InGameId);
                if (dbProphecy == default(Prophecy))
                {
                    Context.Prophecies.Add(prophecy);
                }
                else
                {
                    dbProphecy.PriceInChaos   = prophecy.PriceInChaos;
                    dbProphecy.PriceInExalted = prophecy.PriceInExalted;
                }
            }

            Context.SaveChanges();
        }