Fix #323 - self-replies to appear in public timelines again

db/migrate/20161202132159_add_in_reply_to_account_id_to_statuses.rb

@@ -0,0 +1,18 @@
+class AddInReplyToAccountIdToStatuses < ActiveRecord::Migration[5.0]
+  def up
+    add_column :statuses, :in_reply_to_account_id, :integer, null: true, default: nil
+
+    ActiveRecord::Base.transaction do
+      Status.where.not(in_reply_to_id: nil).includes(:thread).find_each do |status|
+        next if status.thread.nil?
+
+        status.in_reply_to_account_id = status.thread.account_id
+        status.save!
+      end
+    end
+  end
+
+  def down
+    remove_column :statuses, :in_reply_to_account_id
+  end
+end