public class UserRepository : CommonRepository<User, Guid>
{
    public async Task<bool> IsLoginExists(string email)
    {
        return await ExistsAsync(user => user.Email == email);
    }

    public async Task<bool> CheckLoginPassword(string email, string password)
    {
        return await ExistsAsync(user => user.Email == email && user.Password == password);
    }

    public User GetByEmail(string email)
    {
        return FindOne(user => user.Email == email);
    }
}

set users:9001 "{id: 9001, email: leto@dune.gov, ...}"
hset users:lookup:email leto@dune.gov 9001