Since I encountered compatibility Issues with the SQL schemes of JdbcTokenStore / JdbcSagaStore in combination with HSQLDB i gave the JPATokenStore and JPASagaStore a go. Since the JPA*Stores rely on the right Hibernate Dialect (in this case for HSQL) this seems to work better.
I am creating the schemas for both Stores now with liquibase and have turned off the hibernate automatic ddl generation. If anyone is interested, I can provide the HSQLDB liquibase migrations for reference.
Best Regards,
Jakob