Delete row ('2491', '20207') from daily_volatility

ticker_id 2491
day 20207
implied_open 0.7588014760133247
implied_high 0.7826132378129059
implied_low 0.7191152063473557
implied_close 0.7334022634271045
historical_open 1.32552140684336
historical_high 1.32552140684336
historical_low 1.32552140684336
historical_close 1.32552140684336
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