What are the relation between these columns you get while exporting data in Excel?

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Thanks @Kal_Lam this is a very helpful summary - though the UUID should be caveatted that:

  1. UUIDs do not come from the KoBo server:

UUIDs are generated by the client (Collect, Enketo, someone posting XML to the API, etc.), not the KoBo server. Some OpenRosa implementations reject duplicate UUIDs, but we err on the side of never discarding legitimate data—and we do not plan to change this behavior.
Submissions being duplicated with same uuid - #10 by jnm

  1. There is an open ticket (bug) in the Kobo Github around UUIDs being duplicated - so best not to rely on them being unique at the moment.
    Submissions being duplicated with same uuid - #22 by Kal_Lam