How can I delete my data or my DB customer account?

You can delete your data and your customer account at any time - provided there are no outstanding orders (bookings and tickets) or current contracts (e.g. BahnCard subscription).
To delete your customer account, please log in. Then proceed as follows:

DB Navigator: Go to the "Login and security" area in the "Profile" menu item and then select the "Delete customer account" option. Now follow the instructions to delete your customer account.

Int.bahn.de: In the "Manage customer account" section, go to "Personal details" and then select the "Delete account" option at the bottom. Now follow the instructions to delete your customer account.