> For the complete documentation index, see [llms.txt](https://doc.duaer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.duaer.com/integrations/builtin/credentials/postgres.md).

# Set up ChatHub PGVector Store API credentials in Duaer

Store ChatHub PGVector Store API connection details in Duaer for digital-organization nodes to use at runtime. Secrets are protected by the instance encryption key and are not written into node parameters.
## Save the connection in Duaer

Open Credentials and create ChatHub PGVector Store API. Fill in the key, OAuth, or server fields. After you save, digital-organization nodes reference this credential instead of putting the secret in a parameter.

Credential values are protected by the instance encryption key. If you change or lose that key, stored credentials cannot be decrypted. See the hosting notes on encryption keys. The matching node is under [the related node](/integrations/builtin/app-nodes/n8n-nodes-base.postgres.md).

## Who can use this credential

Who can see or edit it follows projects and roles. Do not paste secrets into chat or variables. External vaults are covered under external secrets.
## Questions

### Do ChatHub PGVector Store API secret values appear in Duaer node parameters?

No. In Duaer, ChatHub PGVector Store API secrets stay in the credential. Nodes only reference the credential. Execution records should not show the plaintext secret either.

### What usually stops a ChatHub PGVector Store API credential from saving in Duaer?

Wrong fields, an OAuth callback that does not match the instance URL, or a role that cannot create credentials. Check the fields ChatHub PGVector Store API expects, then confirm you can create credentials in that project.