Delete row ('631', '20731') from daily_volatility

ticker_id 631
day 20731
implied_open 1.344570816283025
implied_high 2.335140107145608
implied_low 0.9397708656901427
implied_close 1.254086121444616
historical_open 0.4794101375649039
historical_high 0.4794101375649039
historical_low 0.4794101375649039
historical_close 0.4794101375649039
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