Delete row ('2491', '20206') from daily_volatility

ticker_id 2491
day 20206
implied_open 0.7524516728667696
implied_high 0.814362253545681
implied_low 0.7524516728667696
implied_close 0.7588014760133247
historical_open 1.32552140684336
historical_high 1.32552140684336
historical_low 1.32552140684336
historical_close 1.32552140684336
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