public async Task <Guid> CreateAsync(EF.ShortenUrl model)
        {
            var item = _context.ShortenUrls.Add(model);
            await _context.SaveChangesAsync();

            return(item.Id);
        }
        public async Task UpdateAsync(EF.ShortenUrl model)
        {
            var item = await _context.ShortenUrls.FindAsync(model.Id);

            item.Shortcut = model.Shortcut;
            item.Url      = model.Url;
            await _context.SaveChangesAsync();
        }