Delete row ('2491', '20528') from daily_volatility

ticker_id 2491
day 20528
implied_open 0.7556265744400472
implied_high 0.7556265744400472
implied_low 0.633392863868863
implied_close 0.652442273308528
historical_open 0.6111685528559204
historical_high 0.6111685528559204
historical_low 0.6111685528559204
historical_close 0.6111685528559204
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