You are helping me build the following AI agent workflow.

## Goal
SEO Keyword Ranking Tracker: Automatically tracks keyword rankings and competitor positions using Bright Data scraping and OpenAI analysis.

## Specification
- What it does: You automatically monitor your keyword rankings and competitor positions by scraping search results with Bright Data and analyzing the data using OpenAI. This workflow identifies optimization opportunities and stores all tracking details in Google Sheets so you can make strategic decisions quickly.
- Trigger: On a schedule (Manual · on demand)
- Autonomy: Fully hands-off
- Expected setup effort: about an afternoon
- Tools/services involved:
  - n8n: Workflow orchestration
  - Bright Data: SERP scraping without blocks
  - OpenAI Chat Model: Ranking analysis and insights
  - Google Sheets: Storing ranking data

## Known pitfalls, handle each one explicitly in your implementation
1. Google Sheets has row limits and API quotas that can cause data loss or delays, so archive old data periodically to keep the sheet manageable.
2. LLM responses can vary in structure which breaks downstream parsing, so enforce a strict JSON schema validation step after the AI node.
3. Search engine results pages change frequently causing inconsistent data fields, so add error handling to skip malformed rows rather than failing the entire run.

## Reference implementation
https://n8n.io/workflows/5962 (workflow template)
Fetch and inspect this before building. If it matches my stack, adapt it;
if not, rebuild the pattern with my tools.

## Process requirements
1. Before building: ask me which of the listed tools I actually use and
   what my platform is (n8n / Make / code / other). Do not assume.
2. Adapt the pattern to my answers; do not force the reference stack.
3. Address every pitfall above; tell me how you handled each.
4. Provide a test plan I can run before letting this touch real data.
5. Ask before any step that sends messages, modifies data, or spends money.

Source: https://usecasesforagents.com/use-case/seo-keyword-ranking-tracker/ via usecasesforagents.com