Just a general recommendation from someone who keeps a long history: if your shell loads a histfile, don't let it grow unbounded.

It isn't massive, but there's real shell startup latency associated with loading lines from your histfile. A few hundred isn't really noteworth, but tens and eventually hundreds of thousands of lines can add up.

(In my case, i store them in a database and I synthesize histfiles from the db. Keeping the permanent storage in a separate file also probably works.)