chore: idempotent cart operations (#13236)

* chore(core-flows): idempotent cart operations

* changeset

* add tests

* revert

* revert route

* promo test

* skip bugs

* fix test

* tests

* avoid workflow name conflict

* prevent nested workflow from being deleted until the top level parent finishes

* remove unused setTimeout

* update changeset

* rm comments

---------

Co-authored-by: adrien2p <adrien.deperetti@gmail.com>

packages/modules/workflow-engine-redis/src/migrations/.snapshot-medusa-workflows.json

@@ -177,6 +177,15 @@
           "unique": false,
           "expression": "CREATE INDEX IF NOT EXISTS \"IDX_workflow_execution_state\" ON \"workflow_execution\" (state) WHERE deleted_at IS NULL"
         },
+        {
+          "keyName": "IDX_workflow_execution_run_id",
+          "columnNames": [],
+          "composite": false,
+          "constraint": false,
+          "primary": false,
+          "unique": false,
+          "expression": "CREATE INDEX IF NOT EXISTS \"IDX_workflow_execution_run_id\" ON \"workflow_execution\" (run_id) WHERE deleted_at IS NULL"
+        },
         {
           "keyName": "workflow_execution_pkey",
           "columnNames": [

packages/modules/workflow-engine-redis/src/migrations/Migration20250819110923.ts

@@ -0,0 +1,13 @@
+import { Migration } from '@mikro-orm/migrations';
+
+export class Migration20250819110923 extends Migration {
+
+  override async up(): Promise<void> {
+    this.addSql(`CREATE INDEX IF NOT EXISTS "IDX_workflow_execution_run_id" ON "workflow_execution" (run_id) WHERE deleted_at IS NULL;`);
+  }
+
+  override async down(): Promise<void> {
+    this.addSql(`drop index if exists "IDX_workflow_execution_run_id";`);
+  }
+
+}