fix retraction count
superevents with multiple retraction voevents (S230715bw) were being counted multiple times in the retraction count.
the distinct() shouldn't add that much overhead since we're dealing with like O(10's) of results in the query.
superevents with multiple retraction voevents (S230715bw) were being counted multiple times in the retraction count.
the distinct() shouldn't add that much overhead since we're dealing with like O(10's) of results in the query.