Delete row ('471', '20731') from daily_volatility

ticker_id 471
day 20731
implied_open 0.5349709150972602
implied_high 1.233449261218312
implied_low 0.5349709150972602
implied_close 1.231861810431673
historical_open 0.1936689959699281
historical_high 0.1936689959699281
historical_low 0.1936689959699281
historical_close 0.1936689959699281
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