Delete row ('602', '20031') from daily_volatility

ticker_id 602
day 20031
implied_open 0.788963040959461
implied_high 0.8286493106254299
implied_low 0.7778508854529897
implied_close 0.8175371551189585
historical_open 0.6794289366813868
historical_high 0.6794289366813868
historical_low 0.6794289366813868
historical_close 0.6794289366813868
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