Delete row ('2491', '20399') from daily_volatility

ticker_id 2491
day 20399
implied_open 0.6302179622955855
implied_high 0.7159403047740782
implied_low 0.6302179622955855
implied_close 0.6603795272417218
historical_open 0.523858759590789
historical_high 0.523858759590789
historical_low 0.523858759590789
historical_close 0.523858759590789
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