Migrate data for shipping_category_id

db/migrate/20230715145329_migrate_shipping_category.rb

@@ -0,0 +1,15 @@
+class MigrateShippingCategory < ActiveRecord::Migration[7.0]
+  def up
+    migrate_shipping_category
+  end
+
+  def migrate_shipping_category
+    ActiveRecord::Base.connection.execute(<<-SQL
+      UPDATE spree_variants
+      SET shipping_category_id = spree_products.shipping_category_id
+      FROM spree_products
+      WHERE spree_variants.product_id = spree_products.id
+    SQL
+    )
+  end
+end