Delete row ('297', '20720') from daily_volatility

ticker_id 297
day 20720
implied_open 0.271454084515227
implied_high 0.2793913384484208
implied_low 0.252404675075562
implied_close 0.2793913384484208
historical_open 0.2174807577695094
historical_high 0.2174807577695094
historical_low 0.2174807577695094
historical_close 0.2174807577695094
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