Did you try to make your Service methods transactional in order to let the ORM manage the commit ?

@Transactional
public void createWorkflow(String workflowId, String appId) {
    var wf = new RCAWorkflow(
         UUID.randomUUID(), workflowId, "localhost", "1.0", appId, "json!", 
         new Date());
    rcaWorkflowRepository.save(wf);
}