#NEWLINE# def schema_downgrade( self , revision , config = None ) : #NEWLINE# #INDENT# 'Used for downgrading database.\n\n        :param revision: Desired database revision\n        :type revision: string\n        :param config: Instance of alembic config\n        ' #NEWLINE# config = ( config or _alembic_config ( ) ) #NEWLINE# return alembic . command . downgrade ( config , self )