Backend for a photo management tool.

1. Extract EXIF/XMP metadata from a photograph.
2. Generate XMP data and write to a sidecar file.
3. Build a stoage layer to store this data into sqlite/something else.
4. Build a gRPC layer to read this data.
5. Query by image name, geofenced location, timestamp, any other feature from read metadata.
6. Extract text(s) in image as metadata.
7. Extract face(s) in image as metadata.
8. Store face(s) models as "Canonical Face Model" or another appropriate serializable format.
9. Try identifying what the context in image is about (auto caption).
10. Query by face, image context, name, text in picture, any other feature.
11. A daemon to continue doing this on all changes.