Delete row ('823', '20731') from daily_volatility

ticker_id 823
day 20731
implied_open 0.2635168305820332
implied_high 0.2635168305820332
implied_low 0.2444674211423682
implied_close 0.2444674211423682
historical_open 0.1730321357436242
historical_high 0.1730321357436242
historical_low 0.1730321357436242
historical_close 0.1730321357436242
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