Delete row ('2514', '20731') from daily_volatility

ticker_id 2514
day 20731
implied_open 0.252404675075562
implied_high 0.2587544782221169
implied_low 0.2508172242889232
implied_close 0.2539921258622007
historical_open 0.1825568404634567
historical_high 0.1825568404634567
historical_low 0.1825568404634567
historical_close 0.1825568404634567
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