Delete row ('1991', '20735') from daily_volatility

ticker_id 1991
day 20735
implied_open 0.8937347928776188
implied_high 2.128771504882569
implied_low 0.8937347928776188
implied_close 1.258848473804532
historical_open 0.43337406475238
historical_high 0.43337406475238
historical_low 0.43337406475238
historical_close 0.43337406475238
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