Delete row ('867', '20731') from daily_volatility

ticker_id 867
day 20731
implied_open 0.2174807577695094
implied_high 0.2571670274354782
implied_low 0.2127184054095931
implied_close 0.2333552656358969
historical_open 0.1904940943966505
historical_high 0.1904940943966505
historical_low 0.1904940943966505
historical_close 0.1904940943966505
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