discourse/db/migrate/20170330041605_add_index_to...

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class AddIndexToTopicStatusUpdates < ActiveRecord::Migration[4.2]
def up
execute <<~SQL
CREATE UNIQUE INDEX idx_topic_id_status_type_deleted_at
ON topic_status_updates(topic_id, status_type)
WHERE deleted_at IS NULL
SQL
end
def down
execute "DROP INDEX idx_topic_id_status_type_deleted_at"
end
end