We have a custom user property at Mixpanel called ...
# questions
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We have a custom user property at Mixpanel called "user_id" but some of our users are missing it at the moment. We want to use BigQuery Data Warehouse to add "user_id" for those users that do not have it in Mixpanel at the moment. Is that possible? Can we use BigQuery Data Warehouse to add new values to an existing user property or is it only designed to add new ones?