Delete row ('602', '20439') from daily_volatility

ticker_id 602
day 20439
implied_open 0.5476705213903703
implied_high 0.6159309052158367
implied_low 0.5127466040843177
implied_close 0.5222713088041502
historical_open 0.6667293303882769
historical_high 0.6667293303882769
historical_low 0.6667293303882769
historical_close 0.6667293303882769
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