Delete row ('1928', '20731') from daily_volatility

ticker_id 1928
day 20731
implied_open 0.9064343991707288
implied_high 0.9667575290630015
implied_low 0.7651512791598797
implied_close 0.8191246059055973
historical_open 0.8048375488258486
historical_high 0.8048375488258486
historical_low 0.8048375488258486
historical_close 0.8048375488258486
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