chore: relocate backend into apps/api ahead of monorepo merge

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/api/database/migrations/20270101000085-convert-advertisements-badge-label-to-array.js

@@ -0,0 +1,58 @@
+'use strict';
+
+// badge_label was a single STRING(100). The Type step redesign lets admins
+// attach up to 2 badges (outline chips) to a "Text with Image" ad, so the
+// column becomes a JSONB string array (renamed badge_labels to match the
+// plural shape, mirroring the existing `ctas` JSONB column). Any existing
+// scalar value is wrapped into a single-element array; null/empty becomes [].
+module.exports = {
+  async up(queryInterface) {
+    await queryInterface.sequelize.query(`
+      ALTER TABLE advertisements
+      ALTER COLUMN badge_label TYPE JSONB
+      USING (
+        CASE
+          WHEN badge_label IS NULL OR badge_label = '' THEN '[]'::jsonb
+          ELSE jsonb_build_array(badge_label)
+        END
+      )
+    `);
+
+    await queryInterface.sequelize.query(`
+      ALTER TABLE advertisements
+      ALTER COLUMN badge_label SET DEFAULT '[]'::jsonb
+    `);
+
+    await queryInterface.sequelize.query(`
+      ALTER TABLE advertisements
+      ALTER COLUMN badge_label SET NOT NULL
+    `);
+
+    await queryInterface.renameColumn('advertisements', 'badge_label', 'badge_labels');
+  },
+
+  async down(queryInterface) {
+    await queryInterface.renameColumn('advertisements', 'badge_labels', 'badge_label');
+
+    await queryInterface.sequelize.query(`
+      ALTER TABLE advertisements
+      ALTER COLUMN badge_label DROP NOT NULL
+    `);
+
+    await queryInterface.sequelize.query(`
+      ALTER TABLE advertisements
+      ALTER COLUMN badge_label TYPE STRING(100)
+      USING (
+        CASE
+          WHEN jsonb_array_length(badge_label) = 0 THEN NULL
+          ELSE badge_label->>0
+        END
+      )
+    `);
+
+    await queryInterface.sequelize.query(`
+      ALTER TABLE advertisements
+      ALTER COLUMN badge_label DROP DEFAULT
+    `);
+  },
+};