Delete row ('257', '20734') from daily_volatility

ticker_id 257
day 20734
implied_open 0.6079936512826429
implied_high 1.192175540765705
implied_low 0.4492485726187675
implied_close 0.5921191434162554
historical_open 0.2079560530496768
historical_high 0.2079560530496768
historical_low 0.2079560530496768
historical_close 0.2079560530496768
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