GDPR

To comply with the GDPR right to erasure, you can anonymize personal data that cannot be deleted because of referential constraints.

Anonymize means that names, addresses, and so on are made unrecognizable by replacing letters with asterisks or other user definable symbols.

Referential constraints are constraints because of links to other data. Deleting data with referential constraints would make the linked data inaccessible and corrupt the database.