Delete row ('6', '20468') from daily_volatility

ticker_id 6
day 20468
implied_open 0.9937441924358603
implied_high 0.9937441924358603
implied_low 0.9191340054638388
implied_close 0.9461206688366977
historical_open 0.9540579227698914
historical_high 0.9540579227698914
historical_low 0.9540579227698914
historical_close 0.9540579227698914
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