Delete row ('6', '20727') from daily_volatility

ticker_id 6
day 20727
implied_open 0.86674812950476
implied_high 0.8969096944508963
implied_low 0.8349991137719849
implied_close 0.885797538944425
historical_open 0.87944773579787
historical_high 0.87944773579787
historical_low 0.87944773579787
historical_close 0.87944773579787
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