Delete row ('9', '20657') from daily_volatility

ticker_id 9
day 20657
implied_open 0.2920909447415308
implied_high 0.2984407478880858
implied_low 0.2920909447415308
implied_close 0.2920909447415308
historical_open 0.2746289860885045
historical_high 0.2746289860885045
historical_low 0.2746289860885045
historical_close 0.2746289860885045
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