stat referrers, locations, and paths

models/stat_referrer.rb

@@ -1,3 +1,15 @@
 class StatReferrer < Sequel::Model
-  many_to_one :stat
+  many_to_one :site
+  RETAINMENT_PERIOD = 7.days
+
+  def self.create_or_get(site_id, url)
+    opts = {site_id: site_id, url: url}
+    stat_referrer = where(opts).where{created_at > RETAINMENT_PERIOD.ago}.first
+
+    DB[table_name].lock('EXCLUSIVE') {
+      stat_referrer = create opts.merge(created_at: Date.today)
+    } if stat_referrer.nil?
+
+    stat_referrer
+  end
 end