Delete row ('1992', '20080') from daily_volatility

ticker_id 1992
day 20080
implied_open 0.6302179622955855
implied_high 0.6968908953344132
implied_low 0.6127560036425592
implied_close 0.6143434544291979
historical_open 0.6937159937611357
historical_high 0.6937159937611357
historical_low 0.6937159937611357
historical_close 0.6937159937611357
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