Delete row ('2491', '20048') from daily_volatility

ticker_id 2491
day 20048
implied_open 0.5413207182438152
implied_high 0.5524328737502865
implied_low 0.5016344485778464
implied_close 0.5127466040843177
historical_open 0.439723867898935
historical_high 0.439723867898935
historical_low 0.439723867898935
historical_close 0.439723867898935
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