[keycloak-user] Custom domain extension for user creation

Hi, I am working on a custom extension to Keycloak using the domain-extension example as a reference, As part of this extension we need to add to the create user functionality. We are adding two new tables which are linked to a UserEntity. We require our custom data to be added in the same transaction as creating a new user. Do you have a recommended way of achieving this? Regards, Mark