Delete row ('2491', '20550') from daily_volatility

ticker_id 2491
day 20550
implied_open 0.6810163874680256
implied_high 0.7794383362396284
implied_low 0.6810163874680256
implied_close 0.742926968146937
historical_open 0.6349803146555018
historical_high 0.6349803146555018
historical_low 0.6349803146555018
historical_close 0.6349803146555018
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