Can't find this covered elsewhere (yet), so:
As I manage about 1000 listings at any one time (has been as high as 3000+) all with unique images, a highly disciplined approach to image management using folders etc is required. But no human process is perfect, nor can I always be sure what ends up in the 'imported images' folder.
Perhaps there's a neat way to identify orphaned images, maybe with some link-history, so these could be selectively deleted from the servers.
The unmanageable part of my image folder system does seem to be only the 'imported' folder.
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