Delete row ('331', '20040') from daily_volatility

ticker_id 331
day 20040
implied_open 0.6318054130822243
implied_high 0.633392863868863
implied_low 0.5349709150972602
implied_close 0.6032312989227266
historical_open 0.6619669780283606
historical_high 0.6619669780283606
historical_low 0.6619669780283606
historical_close 0.6619669780283606
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