Hey Fanny,
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Correct, “Closed” refers to tickets either Fixed or Removed.
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The database cleaner is triggered on an analysis of the project – for example, if I trigger analysis on December 1st, some issues are closed, and I trigger analysis again on January 1st, the database cleaner will run and clean up the closed issues. If I trigger analysis on December 1st and never scan again, the database cleaner will never run and those closed issues will not get cleaned.
I ultimately feel you might wish to vote on MMF-614, which would provide this information in the Project Activity page (and, by way of Web API, probably be easy to query)
Colin