Delete row ('601', '20731') from daily_volatility

ticker_id 601
day 20731
implied_open 0.7794383362396284
implied_high 0.8127748027590423
implied_low 0.769913631519796
implied_close 0.7730885330930735
historical_open 0.6730791335348318
historical_high 0.6730791335348318
historical_low 0.6730791335348318
historical_close 0.6730791335348318
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