public class RefreshToken
{
    public Guid Id { get; set; }
    public Guid UserId { get; set; }
    public string TokenHash { get; set; } = null!;
    public DateTimeOffset ExpiresAt { get; set; }
    public DateTimeOffset? RevokedAt { get; set; }
    public Guid? ReplacedByTokenId { get; set; }
    public DateTimeOffset CreatedAt { get; set; }

    public User User { get; set; } = null!;
    public RefreshToken? ReplacedByToken { get; set; }
}