Isn't the point that you no longer have a connection to the client?
So you can be notified by the database, but you can't (with the stateless HTTP + loadbalancer design explained in the article) get that notification back to the client. Because the client isn't connected anymore; so how does the client know that there's new information?
*I guess there would have to be some mechanism for the database to push notifications to the client. This is not a fundamentally unsolvable or particularly interesting problem.*
So you can be notified by the database, but you can't (with the stateless HTTP + loadbalancer design explained in the article) get that notification back to the client. Because the client isn't connected anymore; so how does the client know that there's new information?