Delete row ('9', '20721') from daily_volatility

ticker_id 9
day 20721
implied_open 0.2317678148492582
implied_high 0.2428799703557294
implied_low 0.2127184054095931
implied_close 0.2206556593427869
historical_open 0.2301803640626194
historical_high 0.2301803640626194
historical_low 0.2301803640626194
historical_close 0.2301803640626194
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