<p>In db/migrate/20140519141742_add_join_table_between_users_and_changesets.rb:</p>
<pre style='color:#555'>> @@ -0,0 +1,11 @@
> +require 'migrate'
> +class AddJoinTableBetweenUsersAndChangesets < ActiveRecord::Migration
> +  def change
> +    create_table :changesets_subscribers, id: false do |t|
> +      t.column :subscriber_id, :bigint, null: false
> +      t.column :changeset_id, :bigint, null: false
> +    end
</pre>
<p>Indexes added in <a href="https://github.com/openstreetmap/openstreetmap-website/commit/6a83a0794f6a4f43e0489787a0c7239cd3ed7fa1" class="commit-link"><tt>6a83a07</tt></a>.</p>

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