Delete row ('6', '20431') from daily_volatility

ticker_id 6
day 20431
implied_open 0.9254838086103938
implied_high 0.9508830211966139
implied_low 0.885797538944425
implied_close 0.9397708656901427
historical_open 1.135027312446709
historical_high 1.135027312446709
historical_low 1.135027312446709
historical_close 1.135027312446709
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