Is it possible to back keycloak 19 with custom DB

My Application is using Older version of Keycloak and we have written custom identity providers to use our own DB. I am planing to migrate to Keycloak 19.0.1 but the interfaces like org.keycloak.storage.UserStorageProviderFactory, org.keycloak.storage.UserStorageProvider which has to be implemented to achieve this is not available in latest Keycloak jars. What is the possible way to use custom DB with Keycloak 19.