Delete row ('602', '20257') from daily_volatility

ticker_id 602
day 20257
implied_open 0.5365583658838989
implied_high 0.6143434544291979
implied_low 0.284153690808337
implied_close 0.5746571847632291
historical_open 0.6905410921878581
historical_high 0.6905410921878581
historical_low 0.6905410921878581
historical_close 0.6905410921878581
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