Delete row ('404', '20671') from daily_volatility

ticker_id 404
day 20671
implied_open 0.161919980237153
implied_high 0.1635074310237917
implied_low 0.1523952755173204
implied_close 0.161919980237153
historical_open 0.1571576278772367
historical_high 0.1571576278772367
historical_low 0.1571576278772367
historical_close 0.1571576278772367
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