first commit

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!;
+}