Delete row ('831', '20732') from daily_volatility

ticker_id 831
day 20732
implied_open 0.2016062499031218
implied_high 0.2016062499031218
implied_low 0.1841442912500955
implied_close 0.1968438975432056
historical_open 0.1428705707974879
historical_high 0.1428705707974879
historical_low 0.1428705707974879
historical_close 0.1428705707974879
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