create folders table

backend/models/folders.js

@@ -0,0 +1,24 @@
+function defineFolder(sequelize, DataTypes) {
+  const Folder = sequelize.define("Folder", {
+    name: {
+      type: DataTypes.STRING,
+      allowNull: false,
+    },
+    detail: {
+      type: DataTypes.STRING,
+      allowNull: true,
+    },
+    parentFolderId: {
+      type: DataTypes.INTEGER,
+      allowNull: true,
+    },
+    projectId: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+    },
+  });
+
+  return Folder;
+}
+
+module.exports = defineFolder;

backend/models/projects.js

@@ -6,7 +6,7 @@ function defineProject(sequelize, DataTypes) {
     },
     detail: {
       type: DataTypes.STRING,
-      allowNull: false,
+      allowNull: true,
     },
   });