Delete row ('1571', '20521') from daily_volatility

ticker_id 1571
day 20521
implied_open 0.1920815451832893
implied_high 0.2063686022630381
implied_low 0.1920815451832893
implied_close 0.1920815451832893
historical_open 0.2127184054095931
historical_high 0.2127184054095931
historical_low 0.2127184054095931
historical_close 0.2127184054095931
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