Delete row ('2439', '20731') from daily_volatility

ticker_id 2439
day 20731
implied_open 0.6730791335348318
implied_high 0.7032406984809682
implied_low 0.6572046256684443
implied_close 0.6762540351081093
historical_open 0.6778414858947481
historical_high 0.6778414858947481
historical_low 0.6778414858947481
historical_close 0.6778414858947481
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