Delete row ('331', '20151') from daily_volatility

ticker_id 331
day 20151
implied_open 0.885797538944425
implied_high 0.885797538944425
implied_low 0.8095999011857647
implied_close 0.8238869582655136
historical_open 1.074704182554437
historical_high 1.074704182554437
historical_low 1.074704182554437
historical_close 1.074704182554437
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