upload limits: refactor deletion confidence calculation.

app/logical/reports/user_promotions.rb

@@ -1,10 +0,0 @@
-module Reports
-  class UserPromotions
-    def self.deletion_confidence_interval_for(user, days = nil)
-      date = (days || 60).days.ago
-      deletions = Post.where("created_at >= ?", date).where(:uploader_id => user.id, :is_deleted => true).count
-      total = Post.where("created_at >= ?", date).where(:uploader_id => user.id).count
-      DanbooruMath.ci_lower_bound(deletions, total)
-    end
-  end
-end