Git integration: prevent prompt change if there is no acknowledgement / validation fails

[jc-antolin]

Currently, prompt version webhooks are "fire-and-forget". This creates two critical issues for teams using the Git integration:

1. Compliance/Governance: We cannot prevent a prompt from being saved and versioned if it fails external validation (e.g., custom syntax checks, PII detection, or policy violations).
2. Resilience: If the webhook receiver (sync server) is down, the prompt is saved in Langfuse but fails to sync to the repository, creating a persistent state mismatch.

Proposed Solution:
Add a configuration option to make specific webhooks "Synchronous/Blocking."

• When a prompt update is attempted (via UI or API), the transaction is paused while Langfuse sends the payload to the blocking webhook.
• If the webhook returns 200 OK, the save is committed.
• If the webhook returns an error (or times out), the save is aborted and an error returned.

If this aligns with the roadmap, I am happy to give a PR a try. Please point me toward the relevant logic where the save transaction is handled!

Additional information

No response

[jc-antolin]

For more context, I am referring to extend the functionality of the integration described here: https://langfuse.com/docs/prompt-management/features/github-integration