Delete row ('2539', '20172') from daily_volatility

ticker_id 2539
day 20172
implied_open 0.2984407478880858
implied_high 0.3095529033945571
implied_low 0.2984407478880858
implied_close 0.3063780018212796
historical_open 0.3079654526079184
historical_high 0.3079654526079184
historical_low 0.3079654526079184
historical_close 0.3079654526079184
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