Delete row ('499', '20670') from daily_volatility

ticker_id 499
day 20670
implied_open 0.742926968146937
implied_high 0.776263434666351
implied_low 0.7397520665736596
implied_close 0.7524516728667696
historical_open 0.6730791335348318
historical_high 0.6730791335348318
historical_low 0.6730791335348318
historical_close 0.6730791335348318
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