feat(promotion): Add metadata column to promotion (#13999)

* feat(promotion): Add metadata column to promotion

Add metadata column to the promotion model.

Closes CORE-1276

* Add changeset

---------

Co-authored-by: Frane Polić <16856471+fPolic@users.noreply.github.com>

.changeset/empty-brooms-unite.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/promotion": patch
+---
+
+Add metadata support in the promotion model.

packages/modules/promotion/src/migrations/.snapshot-medusa-promotion.json

@@ -530,6 +530,15 @@
           "nullable": true,
           "mappedType": "text"
         },
+        "metadata": {
+          "name": "metadata",
+          "type": "jsonb",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": true,
+          "mappedType": "json"
+        },
         "created_at": {
           "name": "created_at",
           "type": "timestamptz",

packages/modules/promotion/src/migrations/Migration20251107050148.ts

@@ -0,0 +1,13 @@
+import { Migration } from '@mikro-orm/migrations';
+
+export class Migration20251107050148 extends Migration {
+
+  override async up(): Promise<void> {
+    this.addSql(`alter table if exists "promotion" add column if not exists "metadata" jsonb null;`);
+  }
+
+  override async down(): Promise<void> {
+    this.addSql(`alter table if exists "promotion" drop column if exists "metadata";`);
+  }
+
+}

packages/modules/promotion/src/models/promotion.ts

@@ -28,6 +28,7 @@ const Promotion = model
       pivotTable: "promotion_promotion_rule",
       mappedBy: "promotions",
     }),
+    metadata: model.json().nullable(),
   })
   .cascades({
     delete: ["application_method"],