n8n Data Processing Workflow

I need a straightforward n8n workflow that pulls records from my database, sends them through one or more APIs for processing, and writes the enriched results back. The focus is on data processing and nothing else—no custom plugins, just native nodes and clear logic.

Here’s what I want to walk away with:
• A working workflow file (.json) that I can import straight into n8n
• Connection setup for both data sources (database credentials and API keys)
• Field mapping so incoming rows are transformed correctly before the API call and on the way back
• Basic error handling—retry on failure and a clean log of any rows that didn’t process

Please test with sample data, comment key nodes, and include a short read-me explaining how I can change credentials and schedule the job.