Delete row ('6', '20257') from daily_volatility

ticker_id 6
day 20257
implied_open 0.988981840075944
implied_high 1.004856347942332
implied_low 0.9588202751298077
implied_close 1.001681446369054
historical_open 1.187413188405788
historical_high 1.187413188405788
historical_low 1.187413188405788
historical_close 1.187413188405788
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