Delete row ('839', '20734') from daily_volatility

ticker_id 839
day 20734
implied_open 0.8905598913043412
implied_high 0.9492955704099751
implied_low 0.8349991137719849
implied_close 0.9413583164767814
historical_open 0.6302179622955855
historical_high 0.6302179622955855
historical_low 0.6302179622955855
historical_close 0.6302179622955855
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