I suspected that might be part of the answer.
Would some combination of triggers work instead? I've played
with those too, but without success.
>
> This is an ancient gotcha: as soon as you delete the book row, there is
> no longer any such entry in the bookview view ... and "old.id" is
> effectively a reference to the bookview view, so the second delete
> finds no matching rows.
>
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