Delete row ('1993', '20668') from daily_volatility

ticker_id 1993
day 20668
implied_open 0.9921567416492215
implied_high 1.052479871541494
implied_low 0.9397708656901427
implied_close 1.017555954235442
historical_open 0.7667387299465185
historical_high 0.7667387299465185
historical_low 0.7667387299465185
historical_close 0.7667387299465185
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