Delete row ('1571', '20420') from daily_volatility

ticker_id 1571
day 20420
implied_open 0.1571576278772367
implied_high 0.1603325294505142
implied_low 0.1523952755173204
implied_close 0.1523952755173204
historical_open 0.1603325294505142
historical_high 0.1603325294505142
historical_low 0.1603325294505142
historical_close 0.1603325294505142
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