Delete row ('2491', '20157') from daily_volatility

ticker_id 2491
day 20157
implied_open 0.7032406984809682
implied_high 0.9048469483840901
implied_low 0.7032406984809682
implied_close 0.87944773579787
historical_open 0.6540297240951668
historical_high 0.6540297240951668
historical_low 0.6540297240951668
historical_close 0.6540297240951668
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