[keycloak-user] Replacing ExampleDS database is much more difficult

I have changed the database many times in the past to point to a real database such as ms-sql and mysql. However, I am not able to figure out how to do that with the latest versions. It seems there are multiple persistence.xml files buried in the lib directory rather than in the auth-server.war or keycloak-server project. Even though I modify keycloak-server.json file to point to my container managed datasource, when I start the server I keep getting the same error about missing the default ExampleDS datasource. What changed? The documentation seems to be quite outdated.