Delete row ('2687', '20481') from daily_volatility

ticker_id 2687
day 20481
implied_open 0.8349991137719849
implied_high 0.9191340054638388
implied_low 0.8302367614120686
implied_close 0.911196751530645
historical_open 0.6968908953344132
historical_high 0.6968908953344132
historical_low 0.6968908953344132
historical_close 0.6968908953344132
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