I lost my Langfuse secret key. Can I retrieve it?

No. The secret key (sk-lf-...) is shown only once, when the key is created. Langfuse stores only a one-way hash of it, so neither the UI nor Langfuse support can show it again. The settings page shows the public key and a masked preview of the secret.

To replace a lost key:

1. Go to Project Settings → API Keys and click Create new API keys.
2. Update your application with the new public and secret key.
3. Delete the old key. Deleting a key invalidates it immediately.

There is no separate "rotate" action; creating a new key and deleting the old one is how you rotate keys. Managing project API keys requires the Owner or Admin role on the project. See API keys.

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