exports.up = function (knex) {
    return knex.schema.createTable('visits', function (table) {
        table.timestamp('timestamp').defaultTo(knex.fn.now());
        table.string('shortcode');
        table.primary(['shortcode', 'timestamp']);
        table.foreign('shortcode').references('shortcode').inTable('urls');
    });
};

exports.down = function (knex) {

};