Delete row ('1819', '20727') from daily_volatility

ticker_id 1819
day 20727
implied_open 0.1857317420367343
implied_high 0.1936689959699281
implied_low 0.1730321357436242
implied_close 0.1841442912500955
historical_open 0.1476329231574041
historical_high 0.1476329231574041
historical_low 0.1476329231574041
historical_close 0.1476329231574041
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