How to handle temporary incoming folder with external library

[AlmightyFrog]

Hi,
i am using Immich since quite some time, had once a broken installation and needed to regenerate all thumbnails/videos again.
What I still not am sure about is how my use-case can be best handled. So far I do only use external libraries and do not intent do change that to the inbuilt upload feature for current devices:

1. Smartphones (3 devices -> 5 folders) sync with syncthing to let's say /media/sync/{devicename} immediately using syncthing.
   This is my "live" view of what happened lately and what i really like. Pictures stay on Smartphones. Some of them might be deleted as they're duplicate/not relevant.

2. Every few months (ideally) i move and sort all pictures to different structure /media/photos/{source}/{year}/{quarter} which results in:

   • they get removed automatically from smartphones (syncthing)
   • immich detects them as new images and starts all the thumbnail/transcoding again. also loses all detected faces and so on.

That is not ideal. What can I do about it? I already tried using separate external libraries for /media/sync and /media/photos but that does not really help either.

For photos made with my classic camera there is not that huge issue, as i directly copy them manually from SD-Card to /media/photos/ and there is no dynamic syncing.

Any suggestions are welcome (also others including maybe changing workflow but syncthing is a given).