[keycloak-user] Keycloak with cassandra and postgres

Hello , I am new to keycloak . We have postgres and cassandra 2 databases in our product , Postgres is not in cluster , it is connecting one to one to each node of the application . Cassandra is in cluster . My question is if I can connect the postgres as external database to keycloak which will save the configuration and realm info on each node separately. For user database can I use UserProvider/UserFederationProvicder SPI to connecto to cassandra ? If yes , then when I will do add User from keycloak administration UI , that user will go to cassandra database ? Please advise Thank you Kedar