PERF: Select distinct active web hooks at the db level.

app/models/web_hook.rb

@@ -38,7 +38,7 @@ class WebHook < ActiveRecord::Base
     WebHook.where(active: true)
       .joins(:web_hook_event_types)
       .where("web_hooks.wildcard_web_hook = ? OR web_hook_event_types.name = ?", true, type.to_s)
-      .uniq
+      .distinct
   end
 
   def self.enqueue_hooks(type, opts = {}, web_hooks = nil)