Delete row ('602', '20640') from daily_volatility

ticker_id 602
day 20640
implied_open 0.7667387299465185
implied_high 0.8111873519724035
implied_low 0.7667387299465185
implied_close 0.7921379425327385
historical_open 0.7191152063473557
historical_high 0.7191152063473557
historical_low 0.7191152063473557
historical_close 0.7191152063473557
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