chore: create index to speed up folder sync (#1018)

Author: apsantiso

migrations/20260330081057-create-folders-user-parent-index.js

@@ -0,0 +1,18 @@
+'use strict';
+
+/** @type {import('sequelize-cli').Migration} */
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    await queryInterface.sequelize.query(`
+      CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_folders_user_parent_updated
+      ON folders (user_id, updated_at)
+      WHERE parent_id IS NOT NULL;
+    `);
+  },
+
+  async down(queryInterface, Sequelize) {
+    await queryInterface.sequelize.query(`
+      DROP INDEX CONCURRENTLY IF EXISTS idx_folders_user_parent_updated;
+    `);
+  },
+};