I'm trying to update a large list of zip codes. Using the built-in updater, I have to break the files up repeatedly and it times out often. I'm trying to learn to import from the command line, but can't seem to import with just a list of Contact IDs and Zip Codes. This seems like the ideal way to match the zip codes to contacts but I get an error saying I have to include first_name, last_name, and email. Is there a way to do this with just a CSV where one column is the Contact ID and the second column is the postal codes (and a third saying the 'contact_type')?