Delete row ('839', '20735') from daily_volatility

ticker_id 839
day 20735
implied_open 0.9937441924358603
implied_high 1.104865747500573
implied_low 0.6794289366813868
implied_close 0.911196751530645
historical_open 0.6302179622955855
historical_high 0.6302179622955855
historical_low 0.6302179622955855
historical_close 0.6302179622955855
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