Delete row ('2756', '20521') from daily_volatility

ticker_id 2756
day 20521
implied_open 0.2539921258622007
implied_high 0.3000281986747246
implied_low 0.2539921258622007
implied_close 0.2571670274354782
historical_open 0.2317678148492582
historical_high 0.2317678148492582
historical_low 0.2317678148492582
historical_close 0.2317678148492582
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