I'm not here to talk you out of rabbitmq now that you've already added it for this project, but IMO it's worth taking a look at PG notify/listen and keeping it

I'm not here to talk you out of rabbitmq now that you've already added it for this project, but IMO it's worth taking a look at PG notify/listen and keeping it in mind for simple use cases. It's not nearly as powerful but it can be a pretty good starting point before pulling in more dependencies.