Delete row ('2509', '20731') from daily_volatility

ticker_id 2509
day 20731
implied_open 0.5556077753235641
implied_high 0.5556077753235641
implied_low 0.3746383856467461
implied_close 0.3905128935131336
historical_open 0.2746289860885045
historical_high 0.2746289860885045
historical_low 0.2746289860885045
historical_close 0.2746289860885045
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