namespace TaxBaik.Domain.Entities; public class Contract { public int Id { get; set; } public int ClientId { get; set; } public string ContractNumber { get; set; } = ""; public string ServiceType { get; set; } = ""; public DateTime ContractDate { get; set; } public DateTime StartDate { get; set; } public DateTime? EndDate { get; set; } public decimal? MonthlyFee { get; set; } public decimal? TotalAmount { get; set; } public string PaymentStatus { get; set; } = "pending"; public string Status { get; set; } = "active"; public string? Notes { get; set; } public DateTime CreatedAt { get; set; } public DateTime UpdatedAt { get; set; } }