Delete row ('2539', '20406') from daily_volatility

ticker_id 2539
day 20406
implied_open 0.3508266238471647
implied_high 0.3540015254204422
implied_low 0.3301897636208609
implied_close 0.3333646651941384
historical_open 0.4047999505928824
historical_high 0.4047999505928824
historical_low 0.4047999505928824
historical_close 0.4047999505928824
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