Delete row ('2764', '20518') from daily_volatility

ticker_id 2764
day 20518
implied_open 0.1904940943966505
implied_high 0.2111309546229543
implied_low 0.1904940943966505
implied_close 0.2000187991164831
historical_open 0.1825568404634567
historical_high 0.1825568404634567
historical_low 0.1825568404634567
historical_close 0.1825568404634567
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