Delete row ('1992', '20172') from daily_volatility

ticker_id 1992
day 20172
implied_open 0.6222807083623917
implied_high 0.6254556099356692
implied_low 0.5968814957761717
implied_close 0.5984689465628104
historical_open 0.8873849897310637
historical_high 0.8873849897310637
historical_low 0.8873849897310637
historical_close 0.8873849897310637
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