I don't want to have to do the work twice. What do you suggest to pass
the DT work done on the laptop to the desktop at home?

As long as you have the .xmp created - when you import it on the home computer - it would be fine.
There are few scenarios that are a bit unclear

- the large USB - are you going to copy the images or use it from the USB? Either way - you can simply import on the second computer and it will read from the .xmp

- once you move the images on the home computer - what happens with the laptop? - if you want to avoid confusion and both computers are accessing the same USB - then you will have to consider synchronization of the library (or easier - delete the library on the travel laptop).

FYI - recently I was experimenting on a laptop with removing / recreating / replacing of "library.db" - it was as easy as stop DT then either rename or delete library.db - DT was very robust and just worked. The only "odd" item that happen when I was experimenting was having old cache with new images - it simply would display the old images in light table then when modify it in darkroom - it will update the preview. Of course - easy to remove the cache altogether and then run darktable-generate-cache.

What you want to avoid is using 2 different libraries (that are not synchronized) and accessing the same images and editing them (because the 2 instances can override one another) but reading the request I don't think this is going to happen.

You can also utilize check for .xmp changes on startup - it works but the drawback is for a big library (many thousands of images) it may take a while. So you don't want to have this setting all the time.

Hope this helps,

B

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