Add check constraints to order_items, products, and stocks for data i…

…ntegrity

db/migrate/20250126034803_add_check_constraints.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class AddCheckConstraints < ActiveRecord::Migration[7.2]
+  def change
+    add_check_constraint :order_items, "product_price >= 0", name: "product_price_non_negative"
+    add_check_constraint :order_items, "quantity > 0", name: "quantity_positive"
+    add_check_constraint :products, "price >= 0", name: "price_non_negative"
+    add_check_constraint :stocks, "quantity >= 0", name: "quantity_non_negative"
+  end
+end