We've used purely excalidraw. Nice to hear you like them!

Here is a fan-out example for async tasks: https://docs.restate.dev/use-cases/async-tasks#parallelizing... First, a number of tasks are scheduled, and then their results are collected (fan-in). This probably comes closest to what you are looking for. Each of those tasks gets executed durably, and their execution tracked by Restate.

Here is another example in the examples repo which does compensation. There is also a Java one https://github.com/restatedev/examples/blob/main/basics/basi...