units,lesson as standalone

database/migrations/20260709000007-add-subscription-to-units.js

@@ -0,0 +1,23 @@
+'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');
+  },
+};