Refactor AssignLabelsToChore function to optimize label assignment and avoid unnecessary

internal/label/repo/repository.go

@@ -73,17 +73,19 @@ func (r *LabelRepository) AssignLabelsToChore(ctx context.Context, choreID int,
 		})
 	}
 	return r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
-
+		if len(toBeRemoved) > 0 {
 			if err := r.db.WithContext(ctx).Where("chore_id = ? AND user_id = ? AND label_id IN (?)", choreID, userID, toBeRemoved).Delete(&chModel.ChoreLabels{}).Error; err != nil {
 				return err
 			}
-
+		}
+		if len(toBeAdded) > 0 {
 			if err := r.db.WithContext(ctx).Clauses(clause.OnConflict{
 				Columns:   []clause.Column{{Name: "chore_id"}, {Name: "label_id"}, {Name: "user_id"}},
 				DoNothing: true,
 			}).Create(&choreLabels).Error; err != nil {
 				return err
 			}
+		}
 		return nil
 	})
 }