Adding warehouse person and group properties

A warehouse property mapping reads a synced warehouse table and writes chosen columns onto people or groups. Each row is matched to a person by a distinct ID column, or to a group by a group key column. The mapped columns are then written as ordinary person properties ($set) or group properties ($groupidentify).

The result is not a separate kind of property. After the first sync the values behave like any other person or group property, so they work in feature flags, cohorts, insights, surveys, and replay filters. See references/where-they-can-be-used.md for the full surface list and the caveats that matter per surface.

In the UI this lives at Data > Warehouse properties, with a Persons tab and a Groups tab.

When to use this skill