create folders table

backend/migrations/20240204090345-create-projects.js

@@ -14,7 +14,7 @@ module.exports = {
       },
       detail: {
         type: Sequelize.STRING,
-        allowNull: false,
+        allowNull: true,
       },
       createdAt: {
         type: Sequelize.DATE,

backend/migrations/20240212022145-create-folders.js

@@ -0,0 +1,48 @@
+'use strict';
+
+/** @type {import('sequelize-cli').Migration} */
+module.exports = {
+  up: async (queryInterface, Sequelize) => {
+    await queryInterface.createTable('folders', {
+      id: {
+        type: Sequelize.INTEGER,
+        primaryKey: true,
+        autoIncrement: true,
+      },
+      name: {
+        type: Sequelize.STRING,
+        allowNull: false,
+      },
+      detail: {
+        type: Sequelize.STRING,
+        allowNull: true,
+      },
+      parentFolderId: {
+        type: Sequelize.INTEGER,
+        allowNull: true,
+      },
+      projectId: {
+        type: Sequelize.INTEGER,
+        allowNull: false,
+        references: {
+          model: 'Projects',
+          key: 'id',
+          onDelete: 'CASCADE',
+          onUpdate: 'CASCADE',
+        },
+      },
+      createdAt: {
+        type: Sequelize.DATE,
+        allowNull: false,
+      },
+      updatedAt: {
+        type: Sequelize.DATE,
+        allowNull: false,
+      },
+    });
+  },
+
+  async down (queryInterface, Sequelize) {
+    await queryInterface.dropTable('folders');
+  }
+};