Delete row ('2471', '20734') from daily_volatility

ticker_id 2471
day 20734
implied_open 0.7921379425327385
implied_high 0.8381740153452624
implied_low 0.7286399110671883
implied_close 0.8318242121987074
historical_open 0.5254462103774277
historical_high 0.5254462103774277
historical_low 0.5254462103774277
historical_close 0.5254462103774277
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