Delete row ('40', '20507') from daily_volatility

ticker_id 40
day 20507
implied_open 0.5127466040843177
implied_high 0.568307381616674
implied_low 0.5032218993644851
implied_close 0.5603701276834803
historical_open 0.4540109249786838
historical_high 0.4540109249786838
historical_low 0.4540109249786838
historical_close 0.4540109249786838
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