Delete row ('40', '20518') from daily_volatility

ticker_id 40
day 20518
implied_open 0.5095717025110401
implied_high 0.5333834643106214
implied_low 0.5095717025110401
implied_close 0.5270336611640665
historical_open 0.4794101375649039
historical_high 0.4794101375649039
historical_low 0.4794101375649039
historical_close 0.4794101375649039
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