One gotcha with roll your own task scheduler is if you want to run it across multiple machines. If you need 5 machines running different scheduled tasks, you need a locking mechanism to ensure only one machine is processing the task. In the author’s approach this is handled by the queue, but in my read the scheduler can only happen on one machine or you get multiple of the same task in the queue. Retry can get more complicated- depending on the failure you may want an exponential backoff, retrying N times and waiting longer durations between. A nice dashboard to see the status of everything is helpful also.

In .NET world I use Hangfire for this. In Node (I assume what this is) I tinkered with Bull, but not sure what best in class is there.