Duplicate Metrices in Database

[jan-gerling]

We collect lots of duplicates for all metrices (Process, Class, Method, Variable and Field), because we insert them into the database again and again even though did not change. I suggest to only insert new metrices into the db, if they are unique for the current commit. This would reduce database size and probably increase the speed of the data-collection, because we would not recompute these metrices.

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