It sounds like a joke but as another senior dev, one of the big lessons I've learned is getting really good at capturing all the requests that come in and who approved them.

It's a bit of cya, but mostly so I can say "I can change that but it's not a bug. It's what was requested for this to do last year. Here's the discussion" It's surprising how often that results in "Oh yeah, that was for x. Let's not touch it." Or "oh that's not a quick fix, let me come back with more information" etc