Delete row ('331', '20480') from daily_volatility

ticker_id 331
day 20480
implied_open 1.063592027047966
implied_high 1.123915156940238
implied_low 1.049304969968217
implied_close 1.108040649073851
historical_open 0.976282233782834
historical_high 0.976282233782834
historical_low 0.976282233782834
historical_close 0.976282233782834
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