public async Task AddOne(Client item)
        {
            CustomValidator.ValidateObject(item);
            await using var context = new MyDbContext(_options);
            if (!Exists(item.Id))
            {
                var enState = await context.Clients.AddAsync(_clientMapper.DomainToDb(item));

                enState.State = EntityState.Added;
                await context.SaveChangesAsync();
            }
        }