Hi Kevin,
Sorry, that's the wrong way around. I should have said:
>
> Your BEFORE UPDATE trigger could leave the "synced" value in NEW
> alone if force_sync was **true**, and set "synced" to false
> otherwise. It could then set NEW.force_sync to false, to leave you
> ready for the next update.
>
Thanks for your advice (and the patience on this list in general).
Instead of using two columns, I now use an integer-column and set it to a
value taken from an incrementing sequence.
Thanks again, Clemens