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BUG-11: Ai ref img jobs are not able to be "re-run"
    - only need to calc refimgs once (so timestamp in refimg and check it)
    - if we re-run a process AI job and no file changes, then don't process (as above)
    - if we do see a new file/updated file, should delete all FPLs then insert new
    -- probably should insert new into a file.people.append(...), rather than FPL direct