i wanted to move some data to another database. The result is that all groups have dissolved and hundreds of files are now in the other database in a folder called “Orphaned Files”. The complete group structure has been dissolved. Can I undo this?
most of the files “are not available” and I cannot “download” them. How/ where can I set DT to display these files correctly again?
It would definitely help if you’d describe your approach in more detail than “move some data to another database”. If some data had been simply some imported files, no groups would have disappeared, nor would you see orphaned files.
Go to the location of your databases in Finder, open Time Machine. It will open to the same folder, and you can go back in time to the point before you botched it. Then select “restore” in Time Machine.
All this is probably explained better somewhere else - it’s essentially the same as restoring any data from a Time Machine backup.