I saw something familiar in my download list... before downloading it again, I wanted to doublecheck with baloo.

Baloosearch did return the location of the file but nothing else: File size would have been very helpful.

After some searching I did find this API cheat sheet:
https://api.kde.org/frameworks/baloo/html/searching.html

File size is not listed - shall I conclude, it is not stored at all?

PS: Would have been a nice help to find duplicates...