Delete row ('635', '20517') from daily_volatility

ticker_id 635
day 20517
implied_open 0.8873849897310637
implied_high 1.004856347942332
implied_low 0.7635638283732409
implied_close 0.9683449798496402
historical_open 1.054067322328133
historical_high 1.054067322328133
historical_low 1.054067322328133
historical_close 1.054067322328133
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