Delete row ('2539', '20180') from daily_volatility

ticker_id 2539
day 20180
implied_open 0.3714634840734685
implied_high 0.3778132872200236
implied_low 0.3476517222738872
implied_close 0.3571764269937197
historical_open 0.3111403541811958
historical_high 0.3111403541811958
historical_low 0.3111403541811958
historical_close 0.3111403541811958
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