public async Task <bool> RegisterAsync(string username, string email, string password, int libraryId)
{
var user = new User
{
LibraryId = libraryId,
Username = username,
Email = email,
Password = _passwordHash.CreateHash(password),
CreatedAt = DateTime.Now
};
_unitOfWork.Users.Add(user);
return(await _unitOfWork.CommitAsync() == 1);
}