This is extremely interesting and I'm eager to see the follow-up. I'm currently planning something very similar at my company and any reference to how other smaller-scale companies handle this when scaling is invaluable. Are there any other blogs from other companies which have talked about similar things?
Not a direct answer to your question, but I maintain an HN-like aggregator of engineering blogs here: https://engineered.at These types of posts pop up there pretty frequently
These need to be sorted by publishing time, not by your database entry time. You can tell because you've recently added Percona, and it's filling up the top with backdated stuff. I'd also have preferred just a minimalist interface. We don't need anymore voting/commenting stuff at this point.