Fix saved searces, news updates, ip bans being dumped to BigQuery.

Prevent saved searches, news updates, and ip bans from being publicly
dumped to BigQuery. They didn't override the `visible` method to
restrict their visibility for anonymous users.

app/models/forum_topic_visit.rb

@@ -2,6 +2,14 @@ class ForumTopicVisit < ApplicationRecord
   belongs_to :user
   belongs_to :forum_topic
 
+  def self.visible(user)
+    if user.is_owner?
+      all
+    else
+      where(user: user)
+    end
+  end
+
   def self.prune!(user)
     where("user_id = ? and last_read_at < ?", user.id, user.last_forum_read_at).delete_all
   end