Commit

fef8734

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.
how do commits get saved on db? it was not a reference by url?

commit fef8734

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.