We can provide this functionality in Nushell for the SqliteBackedHistory if I understand your request correctly. We do it based on the current working directory but could extend this for session ids as well. With the text backed history we can not provide as many convenience features without a breaking change to the representation (purely session based could in theory be made by changing the syncing logic even further, but then the question becomes how much worse can we make the API shared between text based and sqlite. There is already the yearning for a better interface.)

Hmm I see, sounds like a tough nut to crack..

For SqliteBackedHistory probably not so much :)