Delete row ('615', '20151') from daily_volatility

ticker_id 615
day 20151
implied_open 0.2936783955281695
implied_high 0.3095529033945571
implied_low 0.2905034939548921
implied_close 0.2968532971014471
historical_open 0.1968438975432056
historical_high 0.1968438975432056
historical_low 0.1968438975432056
historical_close 0.1968438975432056
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