1

Entities/Contracts/AppMainStruct.cs

@@ -76,4 +76,15 @@ namespace Entities.Contracts
 		Option
 	}
 
+
+
+	public enum SubmissionStatus
+	{
+		Pending,        // 待提交/未开始
+		Submitted,      // 已提交
+		Graded,         // 已批改
+		Resubmission,   // 待重新提交 (如果允许)
+		Late,           // 迟交
+		Draft,          // 草稿
+	}
 }

Entities/Contracts/AssignmentQuestion.cs

@@ -31,6 +31,9 @@ namespace Entities.Contracts
 		[Column("question_number")]
 		public byte Index { get; set; }
 
+		[Column("sequence")]
+		public string Sequence { get; set; } = string.Empty;
+
 		[Column("parent_question_group_id")]
 		public Guid? ParentAssignmentQuestionId { get; set; }
 

Entities/Contracts/Submission.cs

@@ -37,7 +37,7 @@ namespace Entities.Contracts
 		public float? OverallGrade { get; set; }
 
 		[Column("overall_feedback")]
-		public string OverallFeedback { get; set; }
+		public string? OverallFeedback { get; set; }
 
 		[Column("graded_by")]
 		[ForeignKey("Grader")]
@@ -66,13 +66,4 @@ namespace Entities.Contracts
 		}
 	}
 
-	public enum SubmissionStatus
-	{
-		Pending,        // 待提交/未开始
-		Submitted,      // 已提交
-		Graded,         // 已批改
-		Resubmission,   // 待重新提交 (如果允许)
-		Late,           // 迟交
-		Draft,          // 草稿
-	}
 }

Entities/Contracts/SubmissionDetail.cs

@@ -31,16 +31,16 @@ namespace Entities.Contracts
 		public Guid AssignmentQuestionId { get; set; }
 
 		[Column("student_answer")]
-		public string StudentAnswer { get; set; }
+		public string? StudentAnswer { get; set; }
 
 		[Column("is_correct")]
 		public bool? IsCorrect { get; set; }
 
 		[Column("points_awarded")]
-		public float? PointsAwarded { get; set; }
+		public float? PointsAwarded { get; set; } // score
 
 		[Column("teacher_feedback")]
-		public string TeacherFeedback { get; set; }
+		public string? TeacherFeedback { get; set; }
 
 		[Column("created_at")]
 		public DateTime CreatedAt { get; set; }
@@ -54,8 +54,10 @@ namespace Entities.Contracts
 		[ForeignKey(nameof(StudentId))]
 		public User Student { get; set; }
 
+		[ForeignKey(nameof(SubmissionId))]
 		public Submission Submission { get; set; }
 
+		[ForeignKey(nameof(AssignmentQuestionId))]
 		public AssignmentQuestion AssignmentQuestion { get; set; }
 
 		public SubmissionDetail()