Delete row ('1961', '20091') from daily_volatility

ticker_id 1961
day 20091
implied_open 0.2000187991164831
implied_high 0.2000187991164831
implied_low 0.1889066436100118
implied_close 0.1889066436100118
historical_open 0.1476329231574041
historical_high 0.1476329231574041
historical_low 0.1476329231574041
historical_close 0.1476329231574041
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