Delete row ('40', '20668') from daily_volatility

ticker_id 40
day 20668
implied_open 0.5000469977912076
implied_high 0.5381458166705377
implied_low 0.5000469977912076
implied_close 0.530208562737344
historical_open 0.5762446355498678
historical_high 0.5762446355498678
historical_low 0.5762446355498678
historical_close 0.5762446355498678
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