Why don't you use your file manager to rename/move the file? You then will see an untracked and a missing file, but after committing both, the history will be linked.
I've just tried this using your exact same file structure and filenames and have been unable to reproduce the problem you're describing. Could you re-test this? Are you sure there isn't another folder tradinghistory/history which has the same file structure and you're actually trying to rename that a file in that directory instead?
Thanks in advance
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