🐛(backend) fix race condition in reconciliation requests CSV import

[Ash-Crow]

Purpose

The call to the background task is now wrapped in a on_commit to ensure that it isn't called before the save is finished, in order to avoid race condition issues.

Proposal

• Wrapped the call to user_reconciliation_csv_import_job in a transaction.on_commit on UserReconciliationCsvImportAdmin.save_model()

External contributions

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Walkthrough

This pull request addresses a race condition in the CSV import reconciliation workflow. The CHANGELOG.md is updated to document a bug fix for reconciliation requests CSV import. The backend admin file is modified to defer Celery task queuing for UserReconciliationCsvImport objects until after the database transaction commits, rather than queuing immediately. This prevents the task from executing before the object is persisted to the database.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: fixing a race condition in reconciliation CSV import, directly matching the changeset's core purpose.
Description check	✅ Passed	The description is directly related to the changeset, explaining the purpose of wrapping the background task call in transaction.on_commit to prevent race conditions.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sbl-reconciliation-fix-race-condition

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@src/backend/core/admin.py`:
- Around line 114-116: The worker task user_reconciliation_csv_import_job should
defensively handle the case where
UserReconciliationCsvImport.objects.get(id=job_id) raises DoesNotExist: update
the task (the function user_reconciliation_csv_import_job in
src/backend/core/tasks/user_reconciliation.py) to wrap the get(...) call in a
try/except catching UserReconciliationCsvImport.DoesNotExist (or the model's
DoesNotExist), log a clear warning including the job_id, and return gracefully
instead of allowing the exception to bubble up.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

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Configuration used: Repository UI

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📥 Commits

Reviewing files that changed from the base of the PR and between f166e75 and 2de0452.

📒 Files selected for processing (2)

• CHANGELOG.md
• src/backend/core/admin.py