wip multi orders

db/migrate/20250425093336_create_multi_group_orders.rb

@@ -0,0 +1,8 @@
+class CreateMultiGroupOrders < ActiveRecord::Migration[7.0]
+  def change
+    create_table :multi_group_orders, id: :integer do |t|
+      t.references :multi_order, null: false, foreign_key: true, type: :integer
+      t.timestamps
+    end
+  end
+end