text: 
  exports.up = async function(knex) {
  	await knex.schema.createTable('class_clients', tbl => {
  		tbl.integer('class_id')
  			.unsigned()
  			.notNullable()
  			.references('id')
  			.inTable('classes')
  			.onDelete('CASCADE')
  			.onUpdate('CASCADE');
  		tbl.integer('client_id')
  			.unsigned()
  			.notNullable()
  			.references('id')
  			.inTable('users')
  			.onDelete('CASCADE')
  			.onUpdate('CASCADE');
  
  		tbl.primary(['class_id', 'client_id']);
  	})
  }
  
  exports.down = async function(knex) {
  	await knex.schema.dropTableIfExists('class_clients');
  }
  