Delete row ('862', '20720') from daily_volatility

ticker_id 862
day 20720
implied_open 0.9365959641168651
implied_high 1.365207676509329
implied_low 0.6603795272417218
implied_close 1.103278296713935
historical_open 0.9445332180500589
historical_high 0.9445332180500589
historical_low 0.9445332180500589
historical_close 0.9445332180500589
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