Delete row ('1471', '20731') from daily_volatility

ticker_id 1471
day 20731
implied_open 0.2809787892350595
implied_high 0.3047905510346408
implied_low 0.2809787892350595
implied_close 0.2968532971014471
historical_open 0.2095435038363156
historical_high 0.2095435038363156
historical_low 0.2095435038363156
historical_close 0.2095435038363156
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