Delete row ('40', '20490') from daily_volatility

ticker_id 40
day 20490
implied_open 0.3968626966596887
implied_high 0.4079748521661599
implied_low 0.361938779353636
implied_close 0.3651136809269135
historical_open 0.3841630903665786
historical_high 0.3841630903665786
historical_low 0.3841630903665786
historical_close 0.3841630903665786
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