Delete row ('1961', '20480') from daily_volatility

ticker_id 1961
day 20480
implied_open 0.1714446849569855
implied_high 0.1777944881035405
implied_low 0.1714446849569855
implied_close 0.1762070373169017
historical_open 0.1571576278772367
historical_high 0.1571576278772367
historical_low 0.1571576278772367
historical_close 0.1571576278772367
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