FEATURE: proper mailing list mode

once enable_mailing_list_mode is enabled any user can elect
to get every post via email unless they opt out of category or topic

app/models/topic_user.rb

@@ -72,23 +72,6 @@ class TopicUser < ActiveRecord::Base
       TopicUser.where('topic_id = ? and user_id = ?', topic, user).first
     end
 
-    def auto_watch_new_topic(topic_id)
-      # Can not afford to slow down creation of topics when a pile of users are watching new topics, reverting to SQL for max perf here
-      sql = <<SQL
-      INSERT INTO topic_users(user_id, topic_id, notification_level, notifications_reason_id)
-      SELECT id, :topic_id, :level, :reason
-      FROM users
-      WHERE watch_new_topics AND
-            NOT EXISTS(SELECT 1 FROM topic_users WHERE topic_id = :topic_id AND user_id = users.id)
-SQL
-
-      exec_sql(
-          sql,
-                    topic_id: topic_id,
-                    level: notification_levels[:watching],
-                    reason: notification_reasons[:auto_watch]
-              )
-    end
 
     # Change attributes for a user (creates a record when none is present). First it tries an update
     # since there's more likely to be an existing record than not. If the update returns 0 rows affected

app/models/user.rb

@@ -83,6 +83,7 @@ class User < ActiveRecord::Base
   attr_accessor :notification_channel_position
 
   scope :blocked, -> { where(blocked: true) } # no index
+  scope :not_blocked, -> { where(blocked: false) } # no index
   scope :suspended, -> { where('suspended_till IS NOT NULL AND suspended_till > ?', Time.zone.now) } # no index
   scope :not_suspended, -> { where('suspended_till IS NULL') }
   # excluding fake users like the community user