Delete row ('2491', '20159') from daily_volatility

ticker_id 2491
day 20159
implied_open 0.8619857771448437
implied_high 0.8619857771448437
implied_low 0.7746759838797123
implied_close 0.7969002948926548
historical_open 0.6826038382546643
historical_high 0.6826038382546643
historical_low 0.6826038382546643
historical_close 0.6826038382546643
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