Good idea, I can do that!

If you want to avoid too much choice, but still want the "the past is immutable" feel, you can prevent editing after noon next day or similar.

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alde 3 hours ago | parent | next [-]

Days "roll-over" when you sleep, so it should be safe to rollover notes which haven't been edited for 6 hours. That way there is no fixed rollover time.

	▲	stavros 3 hours ago \| parent [-]
		But then if you edit a note in the morning to add something, by night it'll be locked.

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PufPufPuf 4 hours ago | parent | prev | next [-]

Having the default "midnight" be something like 3AM would get you 90% there without any UI changes

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throwaway81523 5 hours ago | parent | prev [-]

I just use a .org file, with git to retain old versions if I edit something that might be of later relevance.