Delete row ('2639', '20731') from daily_volatility

ticker_id 2639
day 20731
implied_open 0.2460548719290069
implied_high 0.2587544782221169
implied_low 0.2095435038363156
implied_close 0.2254180117027031
historical_open 0.1952564467565668
historical_high 0.1952564467565668
historical_low 0.1952564467565668
historical_close 0.1952564467565668
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