first commit

backend/Models/AppConfig.cs

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+namespace backend.Models;
+
+public class AppConfig
+{
+    public string SiteTitle { get; set; } = string.Empty;
+    public string Subtitle { get; set; } = string.Empty;
+    public List<ChannelInfo> Channels { get; set; } = new();
+    public string ShortText { get; set; } = string.Empty;
+    public QuizConfig Quiz { get; set; } = new();
+    public string AdminPassword { get; set; } = string.Empty;
+}
+
+public class ChannelInfo
+{
+    public string Name { get; set; } = string.Empty;
+    public string Url { get; set; } = string.Empty;
+}
+
+public class QuizConfig
+{
+    public int ParticipationPoints { get; set; }
+    public int CorrectAnswerPoints { get; set; }
+}

backend/Models/KhatmItem.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace backend.Models;
+
+public class KhatmItem
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public int Id { get; set; }
+
+    [Required]
+    [MaxLength(200)]
+    public string Title { get; set; } = string.Empty;
+
+    [MaxLength(500)]
+    public string? Url { get; set; }
+
+    [Required]
+    public int Points { get; set; }
+
+    // Navigation
+    public ICollection<UserKhatmSelection> UserSelections { get; set; } = new List<UserKhatmSelection>();
+}

backend/Models/QuizQuestion.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace backend.Models;
+
+public class QuizQuestion
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public int Id { get; set; }
+
+    [Required]
+    [MaxLength(500)]
+    public string QuestionText { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(200)]
+    public string Option1 { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(200)]
+    public string Option2 { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(200)]
+    public string Option3 { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(200)]
+    public string Option4 { get; set; } = string.Empty;
+
+    [Required]
+    public int CorrectOption { get; set; } // 1-4
+
+    // Navigation
+    public ICollection<UserQuizAnswer> Answers { get; set; } = new List<UserQuizAnswer>();
+}

backend/Models/User.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace backend.Models;
+
+public class User
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public int Id { get; set; }
+
+    [Required]
+    [MaxLength(100)]
+    public string FullName { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(50)]
+    public string Contact { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(4)]
+    public string TrackingCode { get; set; } = string.Empty;
+
+    // Navigation properties
+    public UserQuizAttempt? QuizAttempt { get; set; }
+    public ICollection<UserKhatmSelection> KhatmSelections { get; set; } = new List<UserKhatmSelection>();
+    public UserTotalScore? TotalScore { get; set; }
+}

backend/Models/UserKhatmSelection.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace backend.Models;
+
+public class UserKhatmSelection
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public int Id { get; set; }
+
+    [Required]
+    public int UserId { get; set; }
+
+    [Required]
+    public int KhatmItemId { get; set; }
+
+    public bool IsSelected { get; set; }
+
+    public DateTime LastModified { get; set; } = DateTime.UtcNow;
+
+    // Navigation
+    [ForeignKey(nameof(UserId))]
+    public User User { get; set; } = null!;
+
+    [ForeignKey(nameof(KhatmItemId))]
+    public KhatmItem KhatmItem { get; set; } = null!;
+}

backend/Models/UserQuizAnswer.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace backend.Models;
+
+public class UserQuizAnswer
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public int Id { get; set; }
+
+    [Required]
+    public int UserQuizAttemptId { get; set; }
+
+    [Required]
+    public int QuestionId { get; set; }
+
+    [Required]
+    public int SelectedOption { get; set; }
+
+    public bool IsCorrect { get; set; }
+
+    // Navigation
+    [ForeignKey(nameof(UserQuizAttemptId))]
+    public UserQuizAttempt QuizAttempt { get; set; } = null!;
+
+    [ForeignKey(nameof(QuestionId))]
+    public QuizQuestion Question { get; set; } = null!;
+}

backend/Models/UserQuizAttempt.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace backend.Models;
+
+public class UserQuizAttempt
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public int Id { get; set; }
+
+    [Required]
+    public int UserId { get; set; }
+
+    public int ParticipationPoints { get; set; }
+
+    public int CorrectAnswersCount { get; set; }
+
+    public int TotalQuizPoints { get; set; }
+
+    public DateTime CompletedAt { get; set; } = DateTime.UtcNow;
+
+    // Navigation
+    [ForeignKey(nameof(UserId))]
+    public User User { get; set; } = null!;
+
+    public ICollection<UserQuizAnswer> Answers { get; set; } = new List<UserQuizAnswer>();
+}

backend/Models/UserTotalScore.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace backend.Models;
+
+public class UserTotalScore
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public int Id { get; set; }
+
+    [Required]
+    public int UserId { get; set; }
+
+    public int TotalPoints { get; set; }
+
+    // Navigation
+    [ForeignKey(nameof(UserId))]
+    public User User { get; set; } = null!;
+}