Delete row ('1992', '20188') from daily_volatility

ticker_id 1992
day 20188
implied_open 0.898497145237535
implied_high 1.025493208168635
implied_low 0.7730885330930735
implied_close 0.87944773579787
historical_open 1.033430462101829
historical_high 1.033430462101829
historical_low 1.033430462101829
historical_close 1.033430462101829
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