Hi!
Our system has its own user IDs and we assign them when users log in. It works perfectly, but now we need to change our user ID. We changed the user id for a user and Amplitude recognized him as a new user. All history has not been merged and we only see new events. Is there a method we can use to update all user IDs without losing our data?
Solved
Overwrite user_id
Best answer by Saish Redkar
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