import { QueryInterface, DataTypes } from "sequelize"; module.exports = { up: (queryInterface: QueryInterface) => { return queryInterface.removeColumn("Messages", "userId"); }, down: (queryInterface: QueryInterface) => { return queryInterface.addColumn("Messages", "userId", { type: DataTypes.INTEGER, references: { model: "Users", key: "id" }, onUpdate: "CASCADE", onDelete: "SET NULL" }); } };