[keycloak-dev] migrating custom User Fed Providers

Not sure what to do about migration of custom User Fed providers. The issue is around imported users as they have a federation link specified. What I think I can do is check to see if the provider exists for the linked user when queried, if it doesn't remove the user. This would slowly remove old linked users. This is the easiest solution. I can do something similar to LDAP in which if a UserStorage with same provider id exists, then just port it to the new component model. If there isn't a similar provider remove all users that are linked. This becomes much harder as this isn't as simple as deleting the user from the user table. I'll have to port all the queries that are executed from JPA to JDBC when a user is removed. More work....