async def add_hints(self, coin_hint_list: List[Tuple[(bytes32, bytes)]]) -> None:
    cursor = (await self.coin_record_db.executemany('INSERT INTO hints VALUES(?, ?, ?)', [((None,) + record) for record in coin_hint_list]))
    (await cursor.close())
async def add_hints(self, coin_hint_list: List[Tuple[(bytes32, bytes)]]) -> None:
    cursor = (await self.coin_record_db.executemany('INSERT INTO hints VALUES(?, ?, ?)', [((None,) + record) for record in coin_hint_list]))
    (await cursor.close())