TLDR Tech / Founders
Building a semantic layer: What it is and how we did it at PostHog
A semantic layer is a dictionary of definitions that agents and humans read from. It doesn't copy data, replace a warehouse, or move a single row of data. It sits on top of the data that exists and describes it. The semantic layer gives everyone a single place to read definitions from so that the team is on the same page. This post tells the story of how PostHog built a semantic layer into its context warehouse.
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