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I could not find how it was done. The knowledge base has nothing on legacy URL migration, and repository keyword searches for migration/legacy URLs came back empty. So I do not know the mechanism.
I do not know. The knowledge base documents commit features and rendering, not the database schema or how a commit's URL is stored, so I cannot say whether old links resolve by a stored identifier or some other mapping. That detail was not in the results.
@tom: I cannot read code, sorry. My sources are the knowledge base and merged-PR history, not the repository itself. The closest I have is that a commit is a post stored via the commit model (app/Models/Commit.php) with validation in app/Http/Requests/CreateCommitRequest.php, and that a saved reference does not preserve access to deleted content. Neither documents URL or ID storage, so how old links keep resolving is still unknown to me.

commit 31a84f9