[MatheusCastro99]

Closes #141. Plan: #141 (comment)

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[MatheusCastro99]

G2: ready to merge at 7f6c6acf088e55b7ebac33f19c3769b80ec5e646. Reviewed SHA = PR head = the SHA CI passed on.

• G2 at 2ccea2e: the red-team found nothing blocking. The UI check passed on migrated throwaway data: dates, recomputed totals, the PDF page, and every request goes to /api/v2/.
• The owner approved fixes 1–4: the dry run without --, no collection created by a dry run, error codes in failure messages, and the restore keeping the query options. They are in 7f6c6ac, and the narrow re-review approved them.
• Findings 5 and 6 (existing frontend behaviour) were added to backlog Backlog: bugs found during epic work #153.

Before merge (acceptance criterion, owner only): run the README procedure ("Migrating a database from before v2.0") on your own database, and fix anything it reports.

Note from the re-review (non-blocking, no change made): the restore placeholder in Docs/README.md doesn't say to keep the / before ?. Someone who deletes /<database> entirely gets mongodb://host?authSource=..., and the connection-string format needs mongodb://host/?authSource=... (not confirmed with mongorestore itself). If that happens, it fails before --drop runs, so no data is at risk. Recommendation: a one-line wording fix, here before merge or at /close.

The owner merges, then runs /close 141.

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