fix: stabilize inbox confirmation retries

backend/internal/logic/inbox/service.go

@@ -165,8 +165,8 @@ func (s *Service) Confirm(itemIdentity string, userID uint, selectedSuggestionId
 			return err
 		}
 		if item.Status != "open" {
-			result.CreatedCount, err = countConfirmedObjects(tx, item.ID, userID)
-			return err
+			result.CreatedCount = item.ConfirmedCount
+			return nil
 		}
 
 		selected, err := normalizeSelectedIdentities(selectedSuggestionIdentities)
@@ -195,23 +195,14 @@ func (s *Service) Confirm(itemIdentity string, userID uint, selectedSuggestionId
 			}
 			result.CreatedCount++
 		}
-		return tx.Model(item).Update("status", "processed").Error
+		return tx.Model(item).Updates(map[string]any{
+			"status":          "processed",
+			"confirmed_count": result.CreatedCount,
+		}).Error
 	})
 	return result, err
 }
 
-func countConfirmedObjects(tx *gorm.DB, inboxItemID, userID uint) (int, error) {
-	total := int64(0)
-	for _, model := range []any{&models.SenlinAgentTask{}, &models.SenlinAgentNote{}, &models.SenlinAgentSource{}} {
-		var count int64
-		if err := tx.Model(model).Where("source_inbox_item_id = ? AND created_by = ?", inboxItemID, userID).Count(&count).Error; err != nil {
-			return 0, err
-		}
-		total += count
-	}
-	return int(total), nil
-}
-
 func findOwnedInboxItem(tx *gorm.DB, identity string, userID uint, lock bool) (*models.SenlinAgentInboxItem, error) {
 	var item models.SenlinAgentInboxItem
 	query := tx.Model(&models.SenlinAgentInboxItem{}).