'use strict';

exports.up = function(db, cb) {
    db.runSql(
        `
    DELETE FROM client_instances a USING client_instances b WHERE a.app_name = b.app_name AND a.instance_id = b.instance_id AND a.created_at < b.created_at;
    ALTER TABLE client_instances ADD PRIMARY KEY (app_name, instance_id);
  `,
        cb,
    );
};

exports.down = function(db, cb) {
    db.runSql(
        `
        ALTER TABLE client_instances DROP CONSTRAINT client_instances_pkey;
        DROP INDEX IF EXISTS client_instance_pkey
    `,
        cb,
    );
};