Ideas

Things that are planed

Nested Folders
Tagging photos (with words)
Automatic tagging (with AI)
Face recognition (tagging people on photos with AI for suggestions)
Favorite folders (marking some photos as fav)
Importing folders directly into albums
RAW support
Importing/exporting videos
Supporting Apple live photos
Manually add GPS tag
Export to other formats
Importing directly from connected mobile devices

Performence improvements - line of research

Making hash algorithm faster (or choosing a faster one)
SQLite queries
Thumbnail creation (with other than jpg)
File copy

Performance improvments examples

Coding hash algorithm in asm (example for md5)
Sqlite preparing individually requests (not using exec)

Other ideas

Archiving a library | unarchiving a library (using zlib)
At import list all photos with GPS coordinates for showing them on a map