GA4 via treg — what will silently mislead you

You already know the GA4 Data API. This file is only the things that return a plausible wrong answer with no error. Everything here was verified live on 2026-07-22, and each trap was confirmed by watching three independent agents walk into it.

Property id: treg connections ls → the google-analytics row's resource_ref.

1. endDate:"today" silently includes a partial day

3 of 3 agents did this. It inflates every number and you will not notice.

28daysAgo → today      /top-page = 45,120   ← includes a partial day
28daysAgo → yesterday  /top-page = 44,300

Use yesterday unless the user explicitly asks about today. If you must use today, say the last day is partial.