Delete row ('2491', '20256') from daily_volatility

ticker_id 2491
day 20256
implied_open 0.5206838580175115
implied_high 0.5905316926296166
implied_low 0.5206838580175115
implied_close 0.5794195371231453
historical_open 0.6191058067891142
historical_high 0.6191058067891142
historical_low 0.6191058067891142
historical_close 0.6191058067891142
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