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$pm->run_on_finish(sub {
        my ($pid, $exit_code, $ident) = @_;
...
        
        # print STDERR "database $ident done = exit $exit_code \n";
    });

my $obj = Data::Serializer->new(
        serializer => 'Storable',
        portable => '1',
        encoding => 'b64',
    );