Delete row ('9', '20180') from daily_volatility

ticker_id 9
day 20180
implied_open 0.2968532971014471
implied_high 0.3111403541811958
implied_low 0.284153690808337
implied_close 0.2936783955281695
historical_open 0.2984407478880858
historical_high 0.2984407478880858
historical_low 0.2984407478880858
historical_close 0.2984407478880858
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