Reduce to minimum simultaneous queries for WikiTrainingLoader
Reduce to minimum simultaneous queries for WikiTrainingLoader

We're still hitting 429s even with 3 threads, so let's go down to 1 for the moment.

WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard