[keycloak-user] Two level authentication in Keycloak.

Hi Team, Please let me know how we can implement below requirement. 1. Two level authentication in Keycloak. - In first level authenticate user with Ldap and if validation fails authenticate same user with configured DB. Does Keycloak support this feature or how we have to implement this multi-level authentication. I was able to configure ldap with my keycloak server and validate users. But I was not able to find any example how to configure external DB to authenticate users. Please let me hot to configure external DB. Thanks, Bhanu