Thanks, that's what I thought.
I think that bypassing the Recycle bin is a mistake...
If it's unavoidable (because of the technicalities, I'm not a dev) maybe a slightly more secure way to delete projects could be helpful:
right now is quite easy to click "Delete project", and the complete deletion is only another click away :-)
Of course, in this case it was my fault, I don't want to blame anyone,
but it's not the first time I think that this feature of OR could be improved.
Anyway, thanks (I managed to find a older version of my dataset, so I list only few hours of work and not much more).
Aubrey