Set up Langfuse prompt management with version control and production label protection for a multi-environment LLM application

Steps

1. Create a Langfuse project and navigate to the Prompts section; create a new prompt with a name, model configuration, and initial prompt text
2. Each edit creates a new immutable version number; use the version history to track all changes and roll back by promoting an older version to a label
3. Create environment labels (e.g., staging, production) and assign them to specific prompt versions; labels act as mutable pointers your application resolves at runtime
4. Mark the production label as protected in project settings so only project admins and owners can modify or delete it, preventing accidental promotion of untested prompts
5. In your application code, retrieve the active prompt by name and label using the Langfuse SDK (e.g., langfuse.get_prompt(name, label='production')); the SDK caches the resolved prompt client-side for low latency
6. Update the production label to point to a new version through the Langfuse UI after testing on staging; the application picks up the new prompt on the next cache refresh without a code deploy