Delete row ('2504', '20731') from daily_volatility

ticker_id 2504
day 20731
implied_open 0.3381270175540547
implied_high 0.3381270175540547
implied_low 0.1952564467565668
implied_close 0.2111309546229543
historical_open 0.1444580215841267
historical_high 0.1444580215841267
historical_low 0.1444580215841267
historical_close 0.1444580215841267
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