Delete row ('1481', '20668') from daily_volatility

ticker_id 1481
day 20668
implied_open 1.050892420754855
implied_high 1.104865747500573
implied_low 1.011206151088887
implied_close 1.0445426176083
historical_open 1.101690845927296
historical_high 1.101690845927296
historical_low 1.101690845927296
historical_close 1.101690845927296
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