updated db migration

database/migrations/20270101000019-create-products.js

@@ -0,0 +1,25 @@
+'use strict';
+
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    await queryInterface.createTable('products', {
+      id:          { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
+      course_id:   { type: Sequelize.BIGINT, allowNull: false, references: { model: 'courses', key: 'course_id' }, onDelete: 'CASCADE' },
+      name:        { type: Sequelize.STRING(200), allowNull: false },
+      description: { type: Sequelize.TEXT, allowNull: true },
+      price:       { type: Sequelize.DECIMAL(10, 2), allowNull: false },
+      currency:    { type: Sequelize.STRING(10), allowNull: false, defaultValue: 'USD' },
+      access_days: { type: Sequelize.INTEGER, allowNull: true },   // null = lifetime access
+      is_active:   { type: Sequelize.BOOLEAN, allowNull: false, defaultValue: true },
+      createdAt:   { type: Sequelize.DATE, allowNull: false },
+      updatedAt:   { type: Sequelize.DATE, allowNull: false },
+      deletedAt:   { type: Sequelize.DATE, allowNull: true },
+    });
+
+    await queryInterface.addIndex('products', ['course_id']);
+  },
+
+  async down(queryInterface) {
+    await queryInterface.dropTable('products');
+  },
+};