Delete row ('491', '20733') from daily_volatility

ticker_id 491
day 20733
implied_open 0.2873285923816146
implied_high 0.2952658463148083
implied_low 0.2666917321553107
implied_close 0.2825662400216983
historical_open 0.1904940943966505
historical_high 0.1904940943966505
historical_low 0.1904940943966505
historical_close 0.1904940943966505
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