Prevayler

i need to be able to save the snapshot of our plc integration system,
however i cant really anticipate what exactly i need to save. so i opted for saving a java object as BLOB object and updating it as necessary. unfortunately as fields are added to it, serialization schema complains. perhaps i will store attributes as a hashmap and be done with it. Then came Prevayler to my attention, why on earth do i come by elegant solutions after tackling problems?

Using Prevayler will be a risk, because our system will heavily use SQL for reporting. No one gets fired for sticking to Oracle and SQL.