1

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
-	}
 }