public void Add(UserProjection entity)
        {
            var oldState =
                _context.UsersProjection.FirstOrDefault(b => b.Id == entity.Id);

            if (oldState == null)
            {
                _context.UsersProjection.Add(entity);
            }
            else
            {
                _context.Entry(oldState).CurrentValues.SetValues(entity);
            }
        }