Delete row ('9', '20171') from daily_volatility

ticker_id 9
day 20171
implied_open 0.2539921258622007
implied_high 0.2555795766488395
implied_low 0.2381176179958132
implied_close 0.2397050687824519
historical_open 0.2905034939548921
historical_high 0.2905034939548921
historical_low 0.2905034939548921
historical_close 0.2905034939548921
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