Job Listing Aggregator

## Job Aggregator Setup
1. **Define Sources**: Add your API endpoints in the Code node.
2. **Credentials**: Add API keys for job boards if needed.
3. **Google Sheets**: Create a sheet with columns: title, company, url, source, date_scraped.
4. **Filter**: Adjust keywords in 'Filter Keywords' node.

**Logic:**
- Loops through sources
- Fetches data
- Normalizes JSON structure
- Filters for specific roles
- Saves to DB/Sheet
- Handles API errors gracefully