Delete row ('2556', '20731') from daily_volatility

ticker_id 2556
day 20731
implied_open 0.5937065942028942
implied_high 0.6302179622955855
implied_low 0.5937065942028942
implied_close 0.6095811020692816
historical_open 0.6492673717352505
historical_high 0.6492673717352505
historical_low 0.6492673717352505
historical_close 0.6492673717352505
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