Change data before sending / saving to database

Hello,

How can I change the form data before sending / saving to database?
Especially I want to edit one value of a form field before the data will be stored into the database (plugin “Contact Form 7 Database Addon – CFDB7”).
https://ww.wp.xz.cn/plugins/contact-form-cfdb7/

With the action “wpcf7_before_send_mail” I can change the content of the email.
But the value will not be saved into the database.

$mail = $contact_form->prop( ‘mail’ );
$new_mail = str_replace( ‘[fieldname]’, ‘fieldvalue’, $mail );
$contact_form->set_properties( array( ‘mail’ => $new_mail ) );
return $contact_form;

Thank you for your support!