Delete row ('1992', '20391') from daily_volatility

ticker_id 1992
day 20391
implied_open 0.6699042319615544
implied_high 0.6699042319615544
implied_low 0.633392863868863
implied_close 0.633392863868863
historical_open 0.4635356296985163
historical_high 0.4635356296985163
historical_low 0.4635356296985163
historical_close 0.4635356296985163
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