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My second consideration was to simply make a copy of the table data associated with the active document or folder of documents that the baseline was applied to, and store that for safe keeping. The code complexity savings would be enormous, the schema would be kept simpler though there is some impact in terms of storage usage (though I do not believe it will be that big)
This is something I’m faced with as well on a current project. Some good answers here.
I’m personally using option #1, adding a version column to the pkey of each “versioned” table. FKeys use the version column as well. My main consideration was ease of querying, with a consequence of high storage requirements. I have the leeway to strictly limit the number of versions kept around, which mitigates that issue.