Delete row ('9', '20591') from daily_volatility

ticker_id 9
day 20591
implied_open 0.2349427164225357
implied_high 0.2428799703557294
implied_low 0.2333552656358969
implied_close 0.2333552656358969
historical_open 0.2571670274354782
historical_high 0.2571670274354782
historical_low 0.2571670274354782
historical_close 0.2571670274354782
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