Hi, the database structure should be able to handle 255 characters for the node_id field in the database. this was previously a problem in versions before 1.21, what version are you using ?
Please note that when I manually update it to the right node_id (using your excellent backend) in the category section - it does update it correctly, only when I ask it to enter a specific node and all of it's sub nodes - it fucks up the sub nodes with node id > (2^31 -1)