Delete row ('2631', '20728') from daily_volatility

ticker_id 2631
day 20728
implied_open 0.7826132378129059
implied_high 0.8175371551189585
implied_low 0.704828149267607
implied_close 0.8032500980392098
historical_open 0.9381834149035039
historical_high 0.9381834149035039
historical_low 0.9381834149035039
historical_close 0.9381834149035039
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