I don't use any other harness, but I have a cron that picks up changes in my jsonl every X minutes and writes them to a SQLite database with full text search. I also have instructions in my user level claude.md (applies to all projects) to query that database when I'm asking about previous sessions. That's my primary use case where I want it to grab some specific details from a previous session. I have terrible context discipline and have built some tools to help me recover from just continuing a different task/conversation with the wrong context.

I could search it myself, but haven't needed to. Getting it out of SQLite into some format Cursor understands should be trivial.