Yong S.

Request for Assistance: Backfilling Missing Event Property in Mixpanel

Hey dear team! We are missing a custom property on an event between 11/07/2025 to 11/12/2025 . And we are exploring ways to backfill the property to historical 94K events. What we tried:

export the event, backfill the property, and import to mixpanel with same $insertId, ends up with duplicate events
borrowed property: difficult on our data warehouse to combine the borrowed properties

Do we have a recommended way to backfill the missing property? Thanks!

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Posted in Community Questions·

Yong S.

Mixpanel API Anomalies: Understanding Export Data Differences

Hey dear team! We are using the Mixpanel API 2.0/export to export our data, and we noticed some bazaar behavior of the API. We are querying All Events between 11/11/2024 to 11/16/2024 several times. We found out that:

with the exact same filter, the query on 11/15 returns more events than the query on 11/16
with the exact same filter, the query on 12/09 returns some extra events that never appeared in the previous queries.

Are these behavior expected? Do we have a explanation for this? Thank you!

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