### Next: 17
BUG-11: Ai ref img jobs are not able to be "re-run"
    DONE - 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
BUG-15: I think recent images (IMG-46*) have no exif, and so, no thumbnail -
    also no AI match, but that could just be how different mandy/mich faces are
BUG-16: now we dont do dir level optimising for genfiledetails, need to stat the file / check dates that way to optimise