Don't you have that by just resuming old convo?

The only issue is that it didn't hit the cache so it was expensive if you resume later.

Not at the moment apparently. They remove the thinking messages when you continue after 1 hour. That was the whole idea of that change. So the LLM gets all your messages, its responses etc but not the thinking parts, why it generated that responses. You get a lobotomised session.

Or generate tiny filler messages every hour until you come back to it.