Delete row ('2491', '20420') from daily_volatility

ticker_id 2491
day 20420
implied_open 0.5635450292567578
implied_high 0.5635450292567578
implied_low 0.5413207182438152
implied_close 0.5508454229636478
historical_open 0.6191058067891142
historical_high 0.6191058067891142
historical_low 0.6191058067891142
historical_close 0.6191058067891142
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