Delete row ('1571', '20640') from daily_volatility

ticker_id 1571
day 20640
implied_open 0.2381176179958132
implied_high 0.2539921258622007
implied_low 0.2381176179958132
implied_close 0.2476423227156457
historical_open 0.2095435038363156
historical_high 0.2095435038363156
historical_low 0.2095435038363156
historical_close 0.2095435038363156
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