Delete row ('830', '20731') from daily_volatility

ticker_id 830
day 20731
implied_open 0.9635826274897239
implied_high 0.9635826274897239
implied_low 0.7969002948926548
implied_close 0.9159591038905613
historical_open 0.5921191434162554
historical_high 0.5921191434162554
historical_low 0.5921191434162554
historical_close 0.5921191434162554
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