Keycloak Managed vs Unmanaged Attributes
Why Keycloak drops your custom user attributes, what each unmanaged attribute policy really does, and how to migrate attributes into the declarative user profile.
What Personal Data Keycloak Stores (and How to Erase It)
A tested inventory of the personal data Keycloak keeps about a user, what DELETE /users/{id} actually removes, and the three places it leaves behind.