using System.ComponentModel.DataAnnotations; namespace LogisticsApp.Server.Models { public class User { [Key] public int Id { get; set; } [Required] [StringLength(50)] public string Username { get; set; } = string.Empty; [Required] public string PasswordHash { get; set; } = string.Empty; [Required] public string Role { get; set; } = "admin"; // admin, user public DateTime CreatedAt { get; set; } = DateTime.UtcNow; } }