Delete row ('1993', '20663') from daily_volatility

ticker_id 1993
day 20663
implied_open 1.015968503448803
implied_high 1.092166141207463
implied_low 0.9731073322095565
implied_close 1.00644379872897
historical_open 0.7905504917460997
historical_high 0.7905504917460997
historical_low 0.7905504917460997
historical_close 0.7905504917460997
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