Fantastic - thank you but a question re: unique ids

[bouton]

I was struggling to follow the garmin fit sdk and this really helped. Forgive my language deficiencies.
On thing I can't see is how to relate the table with the positions with the other tables created. I see activity_name created (from the filename) in the combined activities and combined user details table - but can't see the same in the positions table (timestamp of course but don't want to have to do that calculation. Am I just missing it?

Trying to be able to do joins acrosss the tables.

Also - converting this to use duckdb

Thanks!!