Delete row ('2766', '20689') from daily_volatility

ticker_id 2766
day 20689
implied_open 0.1920815451832893
implied_high 0.1920815451832893
implied_low 0.1762070373169017
implied_close 0.1825568404634567
historical_open 0.1968438975432056
historical_high 0.1968438975432056
historical_low 0.1968438975432056
historical_close 0.1968438975432056
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