Problem:
- When uploading files on Step 3, wizard_plan was reset to NULL
- wizard_plan is created on Step 2 (StepDescription) and saved by claimsave_primary
- form_get workflow on Step 3 doesn't receive wizard_plan again
- Old SQL was overwriting wizard_plan with NULL
Solution:
- Add 'existing_claim' CTE to read current payload from DB
- Modified all parsers to fallback to DB values if field not in incoming payload:
* wizard_plan_parsed - preserves generated wizard plan
* answers_prefill_parsed - preserves AI-generated prefill
* coverage_report_parsed - preserves coverage analysis
* ai_agent1_facts_parsed - preserves fact extraction
* ai_agent13_rag_parsed - preserves RAG analysis
* problem_description_parsed - preserves user description
Flow:
1. Step 2: User describes problem → claimsave_primary saves wizard_plan ✅
2. Step 3: User uploads files → form_get/claimsave preserves wizard_plan from DB ✅
File: docs/SQL_CLAIMSAVE_UPSERT_SIMPLE.sql
Next: Update n8n workflow 'form_get' node 'claimsave' with this SQL
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