chore(order): Remove unique index on item_id:version for order_item (medusajs#14268)

* Remove unique index

* Add changeset

* Remove previous migration file

* Remove down method

Author: NicolasGorga

.changeset/sour-papayas-relax.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/order": patch
+---
+
+chore(order): Remove unique index on item_id:version for order_item

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

@@ -2005,15 +2005,6 @@
           "unique": false,
           "expression": "CREATE INDEX IF NOT EXISTS \"IDX_order_item_deleted_at\" ON \"order_item\" (\"deleted_at\") WHERE deleted_at IS NOT NULL"
         },
-        {
-          "keyName": "IDX_unique_order_item_version_item_id",
-          "columnNames": [],
-          "composite": false,
-          "constraint": false,
-          "primary": false,
-          "unique": false,
-          "expression": "CREATE UNIQUE INDEX IF NOT EXISTS \"IDX_unique_order_item_version_item_id\" ON \"order_item\" (\"version\", \"item_id\") WHERE deleted_at IS NULL"
-        },
         {
           "keyName": "order_item_pkey",
           "columnNames": [

packages/modules/order/src/migrations/Migration20251130184633.ts

@@ -0,0 +1,9 @@
+import { Migration } from "@mikro-orm/migrations"
+
+export class Migration20251210112924 extends Migration {
+  override async up(): Promise<void> {
+    this.addSql(`drop index if exists "IDX_unique_order_item_version_item_id";`)
+  }
+
+  override async down(): Promise<void> {}
+}

packages/modules/order/src/migrations/Migration20251210112924.ts

@@ -51,12 +51,6 @@ const _OrderItem = model
       unique: false,
       where: "deleted_at IS NOT NULL",
     },
-    {
-      name: "IDX_unique_order_item_version_item_id",
-      on: ["version", "item_id"],
-      unique: true,
-      where: "deleted_at IS NULL",
-    },
   ])
 
 export const OrderItem = _OrderItem