Delete row ('1571', '20710') from daily_volatility

ticker_id 1571
day 20710
implied_open 0.2063686022630381
implied_high 0.2158933069828706
implied_low 0.2063686022630381
implied_close 0.2111309546229543
historical_open 0.2031937006897606
historical_high 0.2031937006897606
historical_low 0.2031937006897606
historical_close 0.2031937006897606
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