Delete row ('1992', '20200') from daily_volatility

ticker_id 1992
day 20200
implied_open 0.9365959641168651
implied_high 0.9365959641168651
implied_low 0.8365865645586236
implied_close 0.885797538944425
historical_open 0.9905692908625827
historical_high 0.9905692908625827
historical_low 0.9905692908625827
historical_close 0.9905692908625827
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