Delete row ('2551', '20731') from daily_volatility

ticker_id 2551
day 20731
implied_open 0.3047905510346408
implied_high 0.3333646651941384
implied_low 0.2238305609160644
implied_close 0.2238305609160644
historical_open 0.1825568404634567
historical_high 0.1825568404634567
historical_low 0.1825568404634567
historical_close 0.1825568404634567
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