Drop all gauged tables

def drop_schema(self):
        """Drop all gauged tables"""
        try:
            self.cursor.execute("""
                DROP TABLE IF EXISTS gauged_data;
                DROP TABLE IF EXISTS gauged_keys;
                DROP TABLE IF EXISTS gauged_writer_history;
                DROP TABLE IF EXISTS gauged_cache;
                DROP TABLE IF EXISTS gauged_statistics;
                DROP TABLE IF EXISTS gauged_metadata""")
            self.db.commit()
        except self.psycopg2.InternalError:  # pragma: no cover
            self.db.rollback()