I am using oban to create a group of tasks, all of these tasks are linked to the same parent. After all the tasks are complete, I want to add additional information to that parent that the tasks have completed, so a different status can be rendered to the user.

Additionally to this, there is no guarantee on the order and concurrency of executed tasks, some might fail and require a retry, the server might be restarted when a new deploy is done (hence why oban is used in the first place).

I was thinking on a few approaches:

1. Exectue a query to check if other jobs are complete at the end of every job, if yes update the status. I do have my fears about this not working correctly in concurrent setting, maybe someone knows more on this topic;
2. Have a background worker that will periodically check number of jobs completed and update the status, this of course implies some potential delays and queries executed, but for my project it is a viable solution;
3. Monitor the tasks with a process, re-synchronize the process based on data from the database when the server is restarted.

If you have any better idea it would be great to hear a different perspective.