'use strict';

// Part 2B — standalone (non-course) units currently can never be tier-gated:
// canAccessUnit only ever checks course links, and an independent unit by
// definition has none. Add a direct, optional subscription field so a
// standalone unit can require a tier on its own. Deliberately no CHECK
// constraint — mirrors 20260101000065-drop-tier-enum-check-user-tiers.js's
// fix, since tier slugs are admin-defined (tier_categories.slug) and not a
// fixed enum.

module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.addColumn('units', 'subscription', {
      type: Sequelize.STRING(50),
      allowNull: true,
      after: 'title',
    });
  },

  async down(queryInterface) {
    await queryInterface.removeColumn('units', 'subscription');
  },
};