Removal of IDs conflicts with existing database

Basically, now that IDs are generated differently for the addition.xml, characters with items previously from the list will give an error when being loaded into nexus. 

Furthermore:
It seems like other IDs have changed, including the blank space in inventory, previously -1 but now 65535.
HP pots and MP pots have changed. 

I can't say for sure, but all IDs have changed, and using an existing sql file will give errors because the item IDs don't exist in the item dictionary. 

Is there an option to add "Object type=" so as to make backwards databases compatible?