Delete row ('839', '20731') from daily_volatility

ticker_id 839
day 20731
implied_open 0.8842100881577862
implied_high 2.097022489149794
implied_low 0.8842100881577862
implied_close 0.9223089070371163
historical_open 0.6286305115089468
historical_high 0.6286305115089468
historical_low 0.6286305115089468
historical_close 0.6286305115089468
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