Delete row ('6', '20390') from daily_volatility

ticker_id 6
day 20390
implied_open 1.2493237690847
implied_high 1.290597489537307
implied_low 1.195350442338982
implied_close 1.22392455649848
historical_open 1.046130068394939
historical_high 1.046130068394939
historical_low 1.046130068394939
historical_close 1.046130068394939
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