History management for kernel implementations

[martinRenou]

I found the documentation a bit unclear concerning history_request and history_reply, https://jupyter-client.readthedocs.io/en/stable/messaging.html#history.

1. Concerning the output history, what output should I save? Is it the entire execute_reply as a string?

session is a number counting up each time the kernel starts

2. I'm implementing an in-memory history manager, every time the kernel is shutdown the history is deleted, so I guess the session number doesn't make sense in my case? (I won't be able to retrieve history from previous sessions)