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Summary
Very slow syncs (>2 minutes) were taking place on the staging Central Server and mostly timing out (Cloudflare timeouts!).
This caused IOErrors on the server's UWSGI.
A few error handling incidents were also encountered and errors should be more readable now.
TODO
If not all TODOs are marked, this PR is considered WIP (work in progress)
Reviewer guidance
n/a
Issues addressed
#5614