fix: add migration to clean up corrupt data caused by feature versioning #4873
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Changes
Related to #4872. This PR adds the migration which retrospectively cleans the data up.
How did you test this code?
We have tested these steps by manually implementing them on current data which was corrupted. I have also written a long and comprehensive migration test to try and (a) illustrate what we're trying to fix, and (b) test that the fix is correct.