Q: If I archive or modify a badly-named event, does GA4 clean up the old data too?

Q: If I archive or modify a badly-named event, does GA4 clean up the old data too?

A: No — this myth leads to ugly surprises in reports. Event edits are forward-only.

— Admin → Events → 'Modify event' or 'Create event' only changes data collected from now on; yesterday's wrongly-named hits stay as they were.
— Archiving a custom dimension stops new collection but doesn't scrub history either.
— To unify old + new in one report, use a 'Modify event' rule plus a regex filter in your Exploration to group both names.

GA4 has no retroactive rename — plan event names before launch.

TL;DR: Event modify/archive is forward-only. Old data keeps its old name; merge with filters, not a rename.

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