cmd: check validate and fix bug risks in commands

cmd/repoint-wrong-warehouse-relations/main.go

@@ -400,8 +400,10 @@ func buildReferencePlan(ctx context.Context, db *gorm.DB) (*referencePlan, error
 }
 
 func runPrechecks(ctx context.Context, db *gorm.DB, rows []planRow, refs *referencePlan, opts *options) error {
-	if err := ensureNoBlockedWarehouseRefs(ctx, db, rows, refs.BlockedWarehouseRefs); err != nil {
-		return err
+	if opts.DeleteWrongWarehouses {
+		if err := ensureNoBlockedWarehouseRefs(ctx, db, rows, refs.BlockedWarehouseRefs); err != nil {
+			return err
+		}
 	}
 	if err := ensureNoPurchaseItemWarehouseConflicts(ctx, db, rows); err != nil {
 		return err
@@ -813,6 +815,9 @@ func reflowAndRecalculateProductWarehouse(
 	if err != nil {
 		return fmt.Errorf("resolve flag group for product_warehouse %d: %w", productWarehouseID, err)
 	}
+	if flagGroupCode == "" {
+		return nil
+	}
 
 	if _, err := fifoSvc.Reflow(ctx, commonSvc.FifoStockV2ReflowRequest{
 		FlagGroupCode:      flagGroupCode,
@@ -862,6 +867,9 @@ func resolveFlagGroupByProductWarehouse(ctx context.Context, tx *gorm.DB, produc
 		Order("rr.id ASC").
 		Limit(1).
 		Take(&selected).Error
+	if err == gorm.ErrRecordNotFound {
+		return "", nil
+	}
 	if err != nil {
 		return "", err
 	}