Add continuous settings configuration field.
function tmgmt_update_8006() {
$storage_definition = BaseFieldDefinition::create('map')
->setLabel(t('Continuous settings'))
->setDescription(t('Continuous sources configuration.'))
->setDefaultValue(array());
\Drupal::entityDefinitionUpdateManager()
->installFieldStorageDefinition('continuous_settings', 'tmgmt_job', 'tmgmt', $storage_definition);
}