Delete row ('1961', '20418') from daily_volatility

ticker_id 1961
day 20418
implied_open 0.1857317420367343
implied_high 0.1857317420367343
implied_low 0.1762070373169017
implied_close 0.1777944881035405
historical_open 0.1825568404634567
historical_high 0.1825568404634567
historical_low 0.1825568404634567
historical_close 0.1825568404634567
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