Delete row ('819', '20731') from daily_volatility

ticker_id 819
day 20731
implied_open 0.1857317420367343
implied_high 0.1857317420367343
implied_low 0.1539827263039592
implied_close 0.1714446849569855
historical_open 0.1476329231574041
historical_high 0.1476329231574041
historical_low 0.1476329231574041
historical_close 0.1476329231574041
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