---
id: TASK-6
title: Verify combiner writes to bulk_address_uploads.combined_output_s3_uri
status: To Do
assignee: []
created_date: '2026-04-20'
updated_date: '2026-04-20'
labels:
  - backend
  - bulk-upload
  - db
dependencies: []
priority: high
ordinal: 6000
---

## Description

<!-- SECTION:DESCRIPTION:BEGIN -->
Frontend drizzle schema column: `bulk_address_uploads.combined_output_s3_uri`. Backend combiner (`backend/bulk_address2uprn_combiner/main.py`) calls `set_combined_csv_s3_uri(UUID(task_id), s3_uri)` from `backend.app.db.models.bulk_address_uploads`.

Confirm that helper actually writes to the **`combined_output_s3_uri`** column (not a legacy `combined_csv_s3_uri`). Name drift suggests risk. Fix if mismatched.
<!-- SECTION:DESCRIPTION:END -->

## Acceptance Criteria
<!-- AC:BEGIN -->
- [ ] #1 Confirmed column name matches frontend schema
- [ ] #2 Fix applied if mismatched
- [ ] #3 Integration test covers: run combiner → row updated → frontend schema reads correctly
<!-- AC:END -->