> As I am the only user of the database and as the HashSet ids does not
> change, I expected that loop to delete every obsolete records.
> However I need to run it multiple times, it always deletes only a part.
>
> I suspect that deleteRow aleady does next, but I did not expect this from
> the specs.

There is no direct call to next() in deleteRow(), but might be that
there is something with event notification.

Roman