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According to my understanding, the number of unique viewers in the past 7 or 30 days is not the simple sum of unique viewers per day.
For example, user A has visited site A every day in the past 7 days, and the number of unique visitors per day is 1, and the total is 7, however the number of unique visitors in the past 7 days is still displayed as 1, because in the past 7 days, the same user visited the site.
So I suggest you look at the statistics of SharePoint, there is no need to manually summarize:
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