[keycloak-user] Keycloak multi-tenancy implementation idea

Hi, We are an opensource company with an ERP based system built in microservices approach. We want to implement a SSO and RBAC for our system (for cloud/on-premise) both. Earlier we were thinking of running one instance per customer but that would be an overkill and too difficult to manage. Second, we decided to create one realm/customer but that hits a ceiling in adding more realms in one instance. So, we were trying and came up with an idea of creating one database per customer and dynamically link it with the Keycloak instance based in the subdomain of the authentication URL. By default, Keycloak uses a datasource to store different data like user information etc and this is configured in the standalone.xml configuration file. Our idea is to have a custom datasource configured here instead of the actual database. This custom datasource can be a microservice or some application or a custome provider which handles the part of pointing to different datasources (one per customer) based on a unique parameter. This way we can achieve a clear separation between mutliple customers and implement multi-tenancy. Could someone who has worked on something similar before let us know if this is something possible ? and put us in the right direction ? Thank you!