Pretty happy with my existing workflow. It started out with a photo organization script a couple of years ago that I ran manually and has now developed into a fully automatic system.

1. syncthing uploads photos from my phone to my NAS (receive only)

2. scheduled systemd service (hourly) on my NAS reads newly received photos, renames them by date, moves it to my photos catalog

3. photoprism starts a scan of the photo library (triggered by systemd when 2. finishes)

4. weekly systemd service syncs the library to backblaze