#NEWLINE# def downgrade( migrate_engine ) : #NEWLINE# #INDENT# meta . bind = migrate_engine #NEWLINE# instances = Table ( 'instances' , meta , autoload = True , autoload_with = migrate_engine ) #NEWLINE# image_ref_column = instances . c . image_ref #NEWLINE# image_ref_column . alter ( name = 'image_id' )