Actually I'm mostly experimenting with usage of the extra eMMC partition but for shell history I won't bother to make any changes if /root/.ash_history survives reboots and sysupgrades.
I think it will survive sysupgrades as I added it to the Flash Operation configuration.
Generating backup archive saves the /root/.ash_history in the archive. I've chosen to save history only on exit.
That works and I don't need to touch anything else.
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