diff --git a/Services/ImportBackgroundService.cs b/Services/ImportBackgroundService.cs
index 0d3de83..6143171 100644
--- a/Services/ImportBackgroundService.cs
+++ b/Services/ImportBackgroundService.cs
@@ -598,8 +598,12 @@ public class ImportBackgroundService : BackgroundService
         // Save ScoreImport parent first to get its Id
         rec_import.ScoreImport = imported;
         await _context.SaveChangesAsync();
+        var scoreImportId = imported.Id;
         _context.ChangeTracker.Clear();
 
+        // Re-attach ScoreImport reference to avoid FK issues during bulk insert
+        var importRef = _context.Attach(new ScoreImport { Id = scoreImportId }).Entity;
+
         // preload recruits (lightweight - only ExamId)
         var recruitsDict = await _context.Recruits
             .Where(x => x.RecruitImport.Id == rec_import.Id)
@@ -669,7 +673,7 @@ public class ImportBackgroundService : BackgroundService
                     r.LastUpdatedAt = DateTime.Now;
                     r.LastUpdateUserId = job.UserId ?? "";
                     r.LastUpdateFullName = job.FullName ?? "System Administrator";
-                    r.ScoreImport = imported;
+                    r.ScoreImport = importRef;
 
                     batchScores.Add(r);
                 }