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What is the problem / what does the code in this PR do
The queries for the metadata always fetch the first rather than the last metadata doc in the collection. This fix is a temporary solution to fetch the last one. We will have to do a better job by adding the changes proposed in #365. This means, making the collection clean of any other documents that might be found by the query to this datakey as well as optimizing the syntax to not use slow operators.
Can you briefly describe how it works?
Query the last document rather than the first.