Delete row ('6', '20591') from daily_volatility

ticker_id 6
day 20591
implied_open 1.301709645043779
implied_high 1.341395914709748
implied_low 1.30012219425714
implied_close 1.320759054483444
historical_open 1.428705707974879
historical_high 1.428705707974879
historical_low 1.428705707974879
historical_close 1.428705707974879
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