>
> It would have to be another datetime field rather than an is_current flag
> because an is_current flag wouldn't help me for queries in the past (if that
> makes sense).


Ah yes, of course, I had not fully grasped that bit. A nullable foreign key
reference to the State that supersedes it might come in useful in future,
and avoids adding another pesky date field. But thinking about it some more
it would probably make the ORM query a little more involved.

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