> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tryhelium.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Schema changelog

> Changes to the Data Access schemas.

Helium only adds columns to a released schema. Removing or renaming a column, or changing what it means, ships as a new schema version (for example `customer_v2`). The older version keeps working for a deprecation period, announced on this page when the new version is released.

**customer\_v1**

Initial release

* Added the `events`, `revenue`, `subscriptions` and `users` views. See [the schema reference](https://docs.tryhelium.com/data-access/schema.md).


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