langfuse-webhooks-events

# Langfuse Webhooks & Events ## Overview Configure Langfuse webhooks to receive notifications on prompt version changes. Langfuse supports webhook events for prompt lifecycle: **Created**, **Updated** (labels/tags changed), and **Deleted**. Use webhooks to trigger CI/CD pipelines, sync prompts to external systems, or notify teams via Slack. ## Prerequisites - Langfuse Cloud or self-hosted instance - HTTPS endpoint to receive webhook POST requests - Webhook secret for HMAC signature verification ## Instructions ### Step 1: Create Webhook Endpoint ```typescript // app/api/webhooks/langfuse/route.ts (Next.js App Router) import { NextRequest, NextResponse } from "next/server"; import crypto from "crypto"; const WEBHOOK_SECRET = process.env.LANGFUSE_WEBHOOK_SECRET!; interface LangfuseWebhookEvent { event: "prompt.created" | "prompt.updated" | "prompt.deleted"; timestamp: string; data: { promptName: string; promptVersion: number; labels?: string[]; projectId: string; [key: string]: any; }; } // Verify HMAC SHA-256 signature function verifySignature(payload: string, signature: string): boolean { const expected = crypto .createHmac("sha256", WEBHOOK_SECRET) .update(payload) .digest("hex"); return crypto.timingSafeEqual( Buffer.from(signature), Buffer.from(expected) ); } export async function POST(request: NextRequest) { const payload = await request.text(); const signature = request.headers.get("x-langfuse-signature"...