Delete row ('2491', '20158') from daily_volatility

ticker_id 2491
day 20158
implied_open 0.8778602850112313
implied_high 0.911196751530645
implied_low 0.8127748027590423
implied_close 0.8349991137719849
historical_open 0.6619669780283606
historical_high 0.6619669780283606
historical_low 0.6619669780283606
historical_close 0.6619669780283606
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