Delete row ('602', '20489') from daily_volatility

ticker_id 602
day 20489
implied_open 0.736577165000382
implied_high 1.000093995582415
implied_low 0.7222901079206332
implied_close 0.8588108755715662
historical_open 0.5365583658838989
historical_high 0.5365583658838989
historical_low 0.5365583658838989
historical_close 0.5365583658838989
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