Delete row ('1571', '20090') from daily_volatility

ticker_id 1571
day 20090
implied_open 0.1762070373169017
implied_high 0.1889066436100118
implied_low 0.1762070373169017
implied_close 0.1857317420367343
historical_open 0.1730321357436242
historical_high 0.1730321357436242
historical_low 0.1730321357436242
historical_close 0.1730321357436242
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