Delete row ('1992', '20689') from daily_volatility

ticker_id 1992
day 20689
implied_open 0.4619481789118776
implied_high 0.4905222930713751
implied_low 0.4428987694722125
implied_close 0.4587732773386
historical_open 0.6921285429744969
historical_high 0.6921285429744969
historical_low 0.6921285429744969
historical_close 0.6921285429744969
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