Why I Slowly Killed Our Monolith

It was 2:00 AM. I was on my third coffee, staring at a terminal window that was doing that thing where it looks like it's working but isn't. We were running a setup where every single customer had their own separate database space (a "schema"). On paper, it sounds like the perfect way to keep data isolated. In reality? It's a nightmare to manage. When the 401st customer's database hit a deadlock during a simple update, everything just stopped. I didn't have a big revelation right then; I just re