Delete row ('9', '20528') from daily_volatility

ticker_id 9
day 20528
implied_open 0.2873285923816146
implied_high 0.2952658463148083
implied_low 0.2587544782221169
implied_close 0.2635168305820332
historical_open 0.2428799703557294
historical_high 0.2428799703557294
historical_low 0.2428799703557294
historical_close 0.2428799703557294
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