Delete row ('1867', '20671') from daily_volatility

ticker_id 1867
day 20671
implied_open 0.814362253545681
implied_high 0.9921567416492215
implied_low 0.633392863868863
implied_close 0.8270618598387911
historical_open 0.7937253933193773
historical_high 0.7937253933193773
historical_low 0.7937253933193773
historical_close 0.7937253933193773
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