Delete row ('1992', '20691') from daily_volatility

ticker_id 1992
day 20691
implied_open 0.4603607281252388
implied_high 0.4921097438580139
implied_low 0.4476611218321287
implied_close 0.4714728836317101
historical_open 0.6667293303882769
historical_high 0.6667293303882769
historical_low 0.6667293303882769
historical_close 0.6667293303882769
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