if (!await knex.schema.hasTable('django_flatpage_sites')) {
    await knex.schema.createTable('django_flatpage_sites', function(table) {
      table.increments().primary();
      table.integer('flatpage_id').notNullable().references('django_flatpage.id');
      table.integer('site_id').notNullable().references('django_site.id');