Please, keep in mind that once you change a query, you actually restart the search. 

This means that the collection starts from that moment onwards. As Mediatoolkit is designed to track real-time mentions, it means that we focus on collecting everything from the moment you set up/change/edit queries.
We do not exclude historical data completely, but the most that we can pick up after the edit is up to 3 months back.

If you wish to keep the historical data, we would advise making sure you extract the data in a form of a document or report prior to making a change.

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