Hi andretmota,
Thanks for your question!
The WP GDPR plugin assists you with the personal data that’s saved in default WordPress.
It’s impossible to do this for all plugins on an efficient way, so we decided to build add-ons to WP GDPR that will assist you with the integration of one plugin with WP GDPR.
The second add-on we built, is for Contact Form DB 7.
Contact Form 7 itself doesn’t store data when you submit a form. For that, there are some great plugins, like Contact Form DB 7.
You can find more information on this page: https://wp-gdpr.eu/add-ons/contact-form-db-7-addon/
If you still have questions, don’t hesitate to ask!