Delete row ('6', '20090') from daily_volatility

ticker_id 6
day 20090
implied_open 1.012793601875525
implied_high 1.063592027047966
implied_low 0.9969190940091377
implied_close 1.014381052662164
historical_open 1.201700245485537
historical_high 1.201700245485537
historical_low 1.201700245485537
historical_close 1.201700245485537
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