Data Deduplication prevents the same user action from being counted more than once when events are sent from both client-side and server-side systems. In modern tracking setups, browsers and servers often fire the same event, which can inflate conversions and revenue if not controlled. Deduplication relies on shared event IDs and timestamps to identify duplicates accurately. This process is essential for reliable GA4 data, clean ad platform reporting, and correct attribution models.

Key Points
• Matches events using event_id and source
• Prevents inflated conversions and revenue
• Improves GA4 and ads accuracy
• Critical for server-side tagging setups