I set this up today, it's very nice, thank you! It indexed more than a decade of photos in a couple of hours and gave me geocoding and "on this date" back more than a decade. I didn't realize I could per-generate thumbnails on my server, too, your docs helped me out a bit there. Have you looked at how much in common the EXIF data elements can be shared with a desktop DAM like Digikam?

I'm looking forward to the Android app being available in an F-Droid repository!