Delete row ('1338', '20507') from daily_volatility

ticker_id 1338
day 20507
implied_open 0.2317678148492582
implied_high 0.2587544782221169
implied_low 0.2317678148492582
implied_close 0.2571670274354782
historical_open 0.2158933069828706
historical_high 0.2158933069828706
historical_low 0.2158933069828706
historical_close 0.2158933069828706
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