Delete row ('1481', '20718') from daily_volatility

ticker_id 1481
day 20718
implied_open 0.7191152063473557
implied_high 0.7524516728667696
implied_low 0.7127654032008007
implied_close 0.7254650094939107
historical_open 0.8588108755715662
historical_high 0.8588108755715662
historical_low 0.8588108755715662
historical_close 0.8588108755715662
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