[TYPO3-mvc] Stored Domain Model within Scheduler Task is always empty

[Alfred Bez]

I improved the TCA and created a minimal configuration. That's all I needed (in /Configuration/TCA/tx_myext_domain_model_simple.php):

############### start ##############
<?php
return [
    'columns' => [
        'titel' => [],
    ],
];
############### end ###############

I removed all db-field and the code from the previous post and it still works.