Look into svn.noMetadata configuration option. It will prevent you from rebuilding the svn to git bridge if something seriously goes wrong, but it prevents the messages from changing.
svn-remote.<name>.noMetadata
This gets rid of the git-svn-id: lines at the end of every commit.
If you lose your .git/svn/git-svn/.rev_db file, git svn will not be able to rebuild it and you won't be able to fetch again, either. This is fine for one-shot imports.
The git svn log command will not work on repositories using this, either. Using this conflicts with the useSvmProps option for (hopefully) obvious reasons
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