def migrate():
for target in targets:
guid = Guid.load(target['guid'])
good_sfn = StoredFileNode.load(target['good'])
bad_sfn = StoredFileNode.load(target['bad'])
logger.info('Repointing Guid {} referent to StoredFileNode {}'.format(target['guid'], target['good']))
guid.referent = good_sfn
guid.save()
logger.info('Removing StoredFileNode {}'.format(target['bad']))
StoredFileNode.remove_one(bad_sfn)
