On all detail pages and for all users (logged-in and non-logged-in), a new table should show a list of
list of users with the top N (=10 at the moment) contributors sorted as per contribution score.
Heading of this should be "Contribution History"
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To do this you can perform a GROUP BY (count aggregation) query on the UpdateItems table, which fetches a list of users as per their submissions in "synced" state.