Delete row ('1571', '20718') from daily_volatility

ticker_id 1571
day 20718
implied_open 0.2158933069828706
implied_high 0.2238305609160644
implied_low 0.2127184054095931
implied_close 0.2158933069828706
historical_open 0.1698572341703467
historical_high 0.1698572341703467
historical_low 0.1698572341703467
historical_close 0.1698572341703467
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