แก้ปัญหา token ถูกล้างไปก่อนที่จะส่ง notification

Services/ImportBackgroundService.cs

@@ -72,6 +72,7 @@ public class ImportBackgroundService : BackgroundService
                 _tracker.UpdateStatus(job.JobId, ImportJobStatus.Completed, job.TotalCount);
 
                 await notificationService.SendImportNotificationAsync(job.Token, false, "ระบบนำเข้าข้อมูลสำเร็จ");
+                job.Token = null; // Clear token after notification sent
             }
             catch (Exception ex)
             {
@@ -79,6 +80,7 @@ public class ImportBackgroundService : BackgroundService
                 _tracker.UpdateStatus(job.JobId, ImportJobStatus.Failed, 0, ex.Message);
 
                 try { await notificationService.SendImportNotificationAsync(job.Token, true, ex.Message); } catch { }
+                job.Token = null; // Clear token after notification sent
 
                 // cleanup minio file on failure
                 if (!string.IsNullOrEmpty(job.ImportDocId))

Services/ImportJobTracker.cs

@@ -72,7 +72,6 @@ public class ImportJobTracker
                 job.CompletedAt = DateTime.Now;
                 // Clear request data to free memory for completed/failed jobs
                 job.Request = null;
-                job.Token = null;
             }
         }
     }