Delete row ('2764', '20517') from daily_volatility

ticker_id 2764
day 20517
implied_open 0.2000187991164831
implied_high 0.2762164368751432
implied_low 0.1936689959699281
implied_close 0.1968438975432056
historical_open 0.1825568404634567
historical_high 0.1825568404634567
historical_low 0.1825568404634567
historical_close 0.1825568404634567
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