discourse/db/migrate/20191030112559_add_index_to...

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# frozen_string_literal: true
class AddIndexToNotifications < ActiveRecord::Migration[6.0]
disable_ddl_transaction!
def up
if !index_exists?(:notifications, [:topic_id, :post_number])
add_index :notifications, [:topic_id, :post_number], algorithm: :concurrently
end
end
def down
raise ActiveRecord::IrreversibleMigration
end
end