Delete row ('602', '20406') from daily_volatility

ticker_id 602
day 20406
implied_open 0.6651418796016381
implied_high 0.7286399110671883
implied_low 0.6238681591490305
implied_close 0.6572046256684443
historical_open 0.671491682748193
historical_high 0.671491682748193
historical_low 0.671491682748193
historical_close 0.671491682748193
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