19 Jul 2024 · GA4 · medium severity · fix verified 9 Sept 2026
Session traffic source record in the GA4 BigQuery event export
'We've added a new record to the GA4 BigQuery Event export that contains the Google Ads and Manual campaign context information for each session present in the export.'
Source: What's new archive — Jul 19, 2024.
What it breaks
Hand-built session attribution in BigQuery is now the second-best source; older queries disagree with the interface.
Who it hits: BigQuery users.
The fix
Read session source from the new record.
fix artifact · #A-004
GA4 BigQuery: sessions with last-click source and key events
One query over the events_* export: sessions per day, the session's last-click source from the record Google added in July 2024, and key events per session.
- verified_on
- 2026-09-09
- next re-check
- 2026-12-01
- status
- current
Sources linked on every entry · artifacts stamped and re-verified · ← all changes