Fix & Optimize n8n Workflow with Custom Code Nodes + Node.js Pipeline Correction

We have an existing n8n automation workflow that includes several Custom Code nodes (JavaScript) which are currently broken or producing incorrect output. We also have a related Node.js data pipeline that needs debugging and correction to properly sync/process data between our systems. What we need: - Review and fix broken Custom Code nodes inside our n8n workflow (JS logic errors, incorrect data transformations, malformed JSON outputs) - Debug and correct an existing Node.js pipeline that handles data processing/API calls feeding into or out of n8n - Ensure proper error handling and data validation at each step - Test the full workflow end-to-end to confirm data flows correctly - Document any changes made (brief comments or a short summary) Requirements: - Proven experience with n8n (self-hosted or cloud), including Custom Code / Function nodes - Strong Node.js / JavaScript debugging skills - Experience with REST APIs, JSON handling, and webhook-based integrations - Familiarity with common n8n nodes (HTTP Request, Webhook, Set, IF, Merge, etc.) - Bonus: experience with databases (Postgres/MongoDB) if the pipeline touches storage Deliverables: Fixed and tested n8n workflow (exported JSON) Corrected Node.js pipeline code Short write-up of what was broken and how it was fixed