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788692d

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.

commit 788692d