The domain + company name trick is solid — wish I'd known that earlier. And agreed on parsing page source for tech stack detection, it's surprisingly reliable and the cost is literally zero.

The last_engaged timestamp filter is a good catch. We had a similar issue with our scheduling system where a stuck "busy" state caused the entire pipeline to freeze for over a day. Ended up adding a simple guard: any early exit from a busy state must release the lock first. Same philosophy — one cheap filter prevents a cascade of wasted work.