Delete row ('538', '20731') from daily_volatility

ticker_id 538
day 20731
implied_open 0.7064156000542456
implied_high 0.7286399110671883
implied_low 0.7000657969076907
implied_close 0.7080030508408844
historical_open 0.465123080485155
historical_high 0.465123080485155
historical_low 0.465123080485155
historical_close 0.465123080485155
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