Delete row ('1571', '20507') from daily_volatility

ticker_id 1571
day 20507
implied_open 0.1635074310237917
implied_high 0.1762070373169017
implied_low 0.1635074310237917
implied_close 0.174619586530263
historical_open 0.2000187991164831
historical_high 0.2000187991164831
historical_low 0.2000187991164831
historical_close 0.2000187991164831
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