Delete row ('1571', '20440') from daily_volatility

ticker_id 1571
day 20440
implied_open 0.1571576278772367
implied_high 0.1571576278772367
implied_low 0.1476329231574041
implied_close 0.1492203739440429
historical_open 0.1603325294505142
historical_high 0.1603325294505142
historical_low 0.1603325294505142
historical_close 0.1603325294505142
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