Delete row ('40', '20438') from daily_volatility

ticker_id 40
day 20438
implied_open 0.3778132872200236
implied_high 0.3968626966596887
implied_low 0.3746383856467461
implied_close 0.3809881887933011
historical_open 0.2603419290087557
historical_high 0.2603419290087557
historical_low 0.2603419290087557
historical_close 0.2603419290087557
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