ready to test

Testing

Signed-off-by: Kenneth Obsequio <k80308392@gmail.com>

database/migrations/20260101000010-create-course-prerequisites.js

@@ -0,0 +1,21 @@
+'use strict';
+
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    await queryInterface.createTable('course_prerequisites', {
+      prereq_id:   { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
+      course_id:   { type: Sequelize.BIGINT, allowNull: false, references: { model: 'courses', key: 'course_id' }, onDelete: 'CASCADE' },
+      ref_type:    { type: Sequelize.ENUM('course', 'unit', 'lesson'), allowNull: false },
+      ref_id:      { type: Sequelize.BIGINT, allowNull: false },
+      order_index: { type: Sequelize.INTEGER, defaultValue: 0 },
+      createdAt:   { type: Sequelize.DATE, allowNull: false },
+      updatedAt:   { type: Sequelize.DATE, allowNull: false },
+    });
+
+    await queryInterface.addIndex('course_prerequisites', ['course_id']);
+  },
+
+  async down(queryInterface) {
+    await queryInterface.dropTable('course_prerequisites');
+  },
+};