Metadata source collisions #27
Description
The single source-specific entry in Meta does not allow for a few possibilities:
- Same data from multiple sources (two Flickr accounts with the same photo and separate comments)
- Same data from multiple URIs on the same source (same image uploaded to Flickr twice, with separate comments)
#16 fixes (1) but not (2). Need to try again.
These cases are pretty rare right now, but will definitely be a thing when we sync local files. Consider same image on disk multiple times, each with an xml sidecar file containing different metadata.