Delete row ('697', '20511') from daily_volatility

ticker_id 697
day 20511
implied_open 0.2746289860885045
implied_high 0.2936783955281695
implied_low 0.2746289860885045
implied_close 0.2936783955281695
historical_open 0.2158933069828706
historical_high 0.2158933069828706
historical_low 0.2158933069828706
historical_close 0.2158933069828706
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