Delete row ('2750', '20731') from daily_volatility

ticker_id 2750
day 20731
implied_open 0.814362253545681
implied_high 0.8286493106254299
implied_low 0.7286399110671883
implied_close 0.7286399110671883
historical_open 0.776263434666351
historical_high 0.776263434666351
historical_low 0.776263434666351
historical_close 0.776263434666351
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