Delete row ('9', '20518') from daily_volatility

ticker_id 9
day 20518
implied_open 0.2762164368751432
implied_high 0.3127278049678346
implied_low 0.2762164368751432
implied_close 0.2936783955281695
historical_open 0.2571670274354782
historical_high 0.2571670274354782
historical_low 0.2571670274354782
historical_close 0.2571670274354782
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