exports.up = async function(knex) {
	await knex.schema.createTable('languages', (table) => {
		table.string('alpha2')
			.primary();

		table.text('name');
		table.text('name_native');
	});

	await knex.schema.alterTable('releases', (table) => {
		table.enum('production_date_precision', ['year', 'month', 'week', 'day', 'hour', 'minute', 'second'])
			.defaultTo('day');

		table.string('language_alpha2')
			.references('alpha2')
			.inTable('languages');
	});
};

exports.down = async function(knex) {
	await knex.schema.alterTable('releases', (table) => {
		table.dropColumn('production_date_precision');
		table.dropColumn('language_alpha2');
	});

	await knex.schema.dropTable('languages');
};