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    Type:Task 
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    Resolution: Fixed
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    Priority:L3 - Default 
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    Affects Version/s: None
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    Component/s: backend
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    None
Right now we have separate classes for every view operation, which are very similar (e.g. average vs. min vs. median vs. max flow node duration), which results in a lot of duplicated code, causing problems in consistency (using constants vs. using inline strings) as well as copy-paste errors.
-We should think about both reducing the amount of classes in the commands as well as reducing the amount of extract methods in the ReportEvaluator.-