Delete row ('6', '20473') from daily_volatility

ticker_id 6
day 20473
implied_open 0.9365959641168651
implied_high 1.06994183019452
implied_low 0.9365959641168651
implied_close 0.9937441924358603
historical_open 0.9810445861427503
historical_high 0.9810445861427503
historical_low 0.9810445861427503
historical_close 0.9810445861427503
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