Solution:
Change in File contact-form-7-to-database-extension\CFDBIntegrationCalderaForms.php Line 39 to
add_action('caldera_forms_submit_complete', array(&$this, 'saveFormData'), 70, 4);
i tried this solution, Caldera data can be saved, but the data seems not perfect, the form's element name (e.g. "{"opt1987784":xx,"opt2040467":yy}") were also saved which were not needed.
Submits of Caldera Forms are not logged anymore.
Solution: Change in File contact-form-7-to-database-extension\CFDBIntegrationCalderaForms.php Line 39 to
add_action('caldera_forms_submit_complete', array(&$this, 'saveFormData'), 70, 4);