public function clean($command)
{
$lockedCombinations = \Combination::whereExists(function ($q) {
$q->select(DB::raw(1))->from('Simulation')->whereRaw('Simulation.Combination_Id = Combination.Combination_Id');
})->get();
if (!$lockedCombinations->isEmpty()) {
$command->info("The following combinations are locked for removal by simulations\n * " . $lockedCombinations->implode('asString', "\n * "));
}
\Combination::whereNotExists(function ($q) {
$q->select(DB::raw(1))->from('Simulation')->whereRaw('Simulation.Combination_Id = Combination.Combination_Id');
})->delete();
}
