Delete row ('9', '20728') from daily_volatility

ticker_id 9
day 20728
implied_open 0.2635168305820332
implied_high 0.2730415353018658
implied_low 0.2444674211423682
implied_close 0.2587544782221169
historical_open 0.2301803640626194
historical_high 0.2301803640626194
historical_low 0.2301803640626194
historical_close 0.2301803640626194
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