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

> ## Agent Instructions
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> Every page on this site is available as Markdown by appending .md to its URL.

# E2105

> Postgres (Drizzle) target — Missing primary key

A snapshot trigger cannot be built for a tracked table without primary key columns.

**Fix** — declare a primary key on the tracked table.


## Related topics

- [Error reference](/en/sdk/pipes-sdk/reference/errors.md)