On Thu, Feb 9, 2023 at 12:24 AM Andreas Joseph Krogh <andreas(at)visena(dot)com>
wrote:
> Is there a better way, using some extra tables to do bookkeeping can the
> have constraints ensuring this business-requirement?
>
>
>
Every time an activity newly becomes "Not Done" increment a "not done seen
counter" and likewise with a "done seen counter". Whenever the former is
greater than the later you have one or more not done activities.
David J.