I have worked some places where a significant amount of business logic lived in database functions and triggers and, hoo boy, that was really hard to reason about. If you're disciplined enough to have migrations around that implemented all that stuff, you're still going to have an unpleasant time piecing all of it together when debugging. But often you're in a state where you don't even have those breadcrumbs and you're pulling out your hair trying to figure out what's going on.