Delete row ('602', '20720') from daily_volatility

ticker_id 602
day 20720
implied_open 0.6238681591490305
implied_high 0.6476799209486118
implied_low 0.5857693402697004
implied_close 0.627043060722308
historical_open 0.7222901079206332
historical_high 0.7222901079206332
historical_low 0.7222901079206332
historical_close 0.7222901079206332
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