Delete row ('1992', '20668') from daily_volatility

ticker_id 1992
day 20668
implied_open 0.6587920764550831
implied_high 0.7111779524141619
implied_low 0.6587920764550831
implied_close 0.6905410921878581
historical_open 0.5984689465628104
historical_high 0.5984689465628104
historical_low 0.5984689465628104
historical_close 0.5984689465628104
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