+10 for Digital Assets Management app. With Adobe moving Lightroom to the subscription model, and Apple replacing Aperture with an infant app, there is a huge void in DAM apps for Mac.
A minimum viable app in this space might be reasonably low hanging fruit given all the code that Affinity must have laying around. My minimum viable would be:
1. folder/file based indexing
2. standards based metadata tagging (XMP/ITPC/EXIF)
3. thumbnail and zoom preview of RAW files
4. edit in Affinity Photo
5. search (db based text search, ..index re/generated in req. #1)
6. camera import
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Would be nice to have the ability to run Google Nik plugin collection :-) (Aperture API support?)