How to rate-limit by parameter value

[TheBestMoshe]

I am trying to implement a queue which has, say, 5 workers. The workers are processing jobs for events generated by user accounts.

I would like to make sure that no more than one job is processed for an account at a time.

I can't make a separate queue for each account, because that would allow n workers for n accounts. The system resources can't handle so many workers.

Any suggestions on how to do this efficiently?

[TheBestMoshe]

To answer my own question, Bull has a rate-limiting feature called Group Key which can be used to set a rate limit, in this case, for each account.