fix: Use parent transaction for findOrCreate after-commit hook (#8173)

server/models/Event.ts

@@ -83,7 +83,12 @@ class Event extends IdModel<
     options: SaveOptions<InferAttributes<Event>>
   ) {
     if (options.transaction) {
-      options.transaction.afterCommit(() => void globalEventQueue.add(model));
+      // 'findOrCreate' creates a new transaction always, and the transaction from the middleware is set as its parent.
+      // We want to use the parent transaction, otherwise the 'afterCommit' hook will never fire in this case.
+      // See: https://github.com/sequelize/sequelize/issues/17452
+      (options.transaction.parent || options.transaction).afterCommit(
+        () => void globalEventQueue.add(model)
+      );
       return;
     }
     void globalEventQueue.add(model);

server/typings/sequelize.d.ts

@@ -0,0 +1,7 @@
+import "sequelize";
+
+declare module "sequelize" {
+  interface Transaction {
+    parent?: Transaction;
+  }
+}