Delete row ('664', '20731') from daily_volatility

ticker_id 664
day 20731
implied_open 0.2984407478880858
implied_high 0.2984407478880858
implied_low 0.2825662400216983
implied_close 0.2873285923816146
historical_open 0.2270054624893419
historical_high 0.2270054624893419
historical_low 0.2270054624893419
historical_close 0.2270054624893419
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