Delete row ('635', '20420') from daily_volatility

ticker_id 635
day 20420
implied_open 1.079466534914353
implied_high 1.173126131326039
implied_low 0.9191340054638388
implied_close 1.001681446369054
historical_open 0.9905692908625827
historical_high 0.9905692908625827
historical_low 0.9905692908625827
historical_close 0.9905692908625827
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