Delete row ('960', '20731') from daily_volatility

ticker_id 960
day 20731
implied_open 0.3111403541811958
implied_high 0.3111403541811958
implied_low 0.2905034939548921
implied_close 0.2984407478880858
historical_open 0.2031937006897606
historical_high 0.2031937006897606
historical_low 0.2031937006897606
historical_close 0.2031937006897606
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