Delete row ('40', '20160') from daily_volatility

ticker_id 40
day 20160
implied_open 0.3968626966596887
implied_high 0.4206744584592699
implied_low 0.3968626966596887
implied_close 0.4206744584592699
historical_open 0.2206556593427869
historical_high 0.2206556593427869
historical_low 0.2206556593427869
historical_close 0.2206556593427869
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