Delete row ('1665', '20720') from daily_volatility

ticker_id 1665
day 20720
implied_open 0.2619293797953945
implied_high 0.2635168305820332
implied_low 0.2270054624893419
implied_close 0.2555795766488395
historical_open 0.2317678148492582
historical_high 0.2317678148492582
historical_low 0.2317678148492582
historical_close 0.2317678148492582
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