feat: add retake attempt functionality and update translations for retake button

- Updated database schema to include `storage_quota_bytes` and `plan` for users.
- Implemented storage usage calculations in `storageRepo` and added tests for storage functionality.
- Created `StorageManager` component to display and manage user storage.
- Enhanced user settings to show storage details and warnings for high usage.
- Added translations for new storage-related strings in English and Dutch.
- Updated styles for storage overview and details in CSS.

.gitea/workflows/deploy.yml

@@ -27,10 +27,8 @@ jobs:
           echo "SSH_AGENT_PID=$SSH_AGENT_PID" >> "$GITHUB_ENV"
 
       - name: Write Inventory
-        # StrictHostKeyChecking=no is intentional for a known home-network host.
-        # To harden, add the host fingerprint as a secret and use a known_hosts file.
         run: |
-          printf '[orangepi]\norangepi ansible_host=%s ansible_user=%s ansible_ssh_common_args="-o StrictHostKeyChecking=no -o ForwardAgent=yes"\n' \
+          printf '[orangepi]\norangepi ansible_host=%s ansible_user=%s\n' \
             "${{ secrets.ANSIBLE_HOST }}" \
             "${{ secrets.ANSIBLE_USER }}" > /tmp/inventory.ini
 
@@ -55,7 +53,8 @@ jobs:
         run: |
           ansible-playbook ansible/deploy.yml \
             -i /tmp/inventory.ini \
-            -e "artifact_path=${WORKSPACE}"
+            -e "artifact_path=${WORKSPACE}" \
+            -e "jwt_secret=${{ secrets.JWT_SECRET }}"
 
       - name: Cleanup
         if: always()

.gitea/workflows/release.yml

@@ -63,6 +63,10 @@ jobs:
                 - "3001:3001"
               volumes:
                 - brainwave-db:/app/backend/db
+              env_file:
+                - .env
+              environment:
+                - NODE_ENV=production
               restart: unless-stopped
           volumes:
             brainwave-db:
@@ -77,6 +81,10 @@ jobs:
                 - "3001:3001"
               volumes:
                 - brainwave-db:/app/backend/db
+              env_file:
+                - .env
+              environment:
+                - NODE_ENV=production
               restart: unless-stopped
           volumes:
             brainwave-db:

.gitignore

@@ -7,3 +7,4 @@ backend/db/brainwave.db-wal
 node_modules/.vite/vitest/da39a3ee5e6b4b0d3255bfef95601890afd80709/results.json
 brainwave.db-shm
 brainwave.db-wal
+node_modules/

ansible/deploy.yml

@@ -24,6 +24,12 @@
         src: "{{ artifact_path }}/docker-compose.arm64.yml"
         dest: "{{ deploy_dir }}/docker-compose.yml"
 
+    - name: Create .env file
+      ansible.builtin.copy:
+        content: "JWT_SECRET={{ jwt_secret }}\n"
+        dest: "{{ deploy_dir }}/.env"
+        mode: "0600"
+
     - name: Load Docker image
       ansible.builtin.command: docker load -i {{ deploy_dir }}/brainwave-arm64.tar.gz
       register: docker_load_result

backend/package-lock.json

@@ -14,6 +14,7 @@
         "dotenv": "^16.4.7",
         "express": "^5.1.0",
         "express-rate-limit": "^7.5.0",
+        "helmet": "^8.1.0",
         "jsonwebtoken": "^9.0.2",
         "nodemailer": "^7.0.3",
         "zod": "^3.24.2"
@@ -1862,6 +1863,15 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/helmet": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/helmet/-/helmet-8.1.0.tgz",
+      "integrity": "sha512-jOiHyAZsmnr8LqoPGmCjYAaiuWwjAPLgY8ZX2XrmHawt99/u1y6RgrZMTeoPfpUbV96HOalYgz1qzkRbw54Pmg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/http-errors": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-2.0.1.tgz",

backend/package.json

@@ -16,6 +16,7 @@
     "dotenv": "^16.4.7",
     "express": "^5.1.0",
     "express-rate-limit": "^7.5.0",
+    "helmet": "^8.1.0",
     "jsonwebtoken": "^9.0.2",
     "nodemailer": "^7.0.3",
     "zod": "^3.24.2"

backend/src/config.ts

@@ -28,7 +28,7 @@ export const config = {
   jwtSecret: env('JWT_SECRET'),
   dbPath: env('DB_PATH', './db/brainwave.db'),
   corsOrigin: env('CORS_ORIGIN', 'http://localhost:5173'),
-  bodyLimit: env('BODY_LIMIT', '10mb'),
+  bodyLimit: env('BODY_LIMIT', '100kb'),
 
   email: {
     smtpHost: env('SMTP_HOST', ''),

backend/src/db/database.ts

@@ -4,17 +4,23 @@ import path from 'path'
 import { config } from '../config.js'
 import { runMigrations } from './migrations.js'
 
-const DB_PATH = path.isAbsolute(config.dbPath)
-  ? config.dbPath
-  : path.join(process.cwd(), config.dbPath)
+const DB_PATH = config.dbPath === ':memory:'
+  ? ':memory:'
+  : path.isAbsolute(config.dbPath)
+    ? config.dbPath
+    : path.join(process.cwd(), config.dbPath)
 
 let db: Database.Database | null = null
 
 export function getDb(): Database.Database {
   if (!db) {
-    fs.mkdirSync(path.dirname(DB_PATH), { recursive: true })
+    if (DB_PATH !== ':memory:') {
+      fs.mkdirSync(path.dirname(DB_PATH), { recursive: true })
+    }
     db = new Database(DB_PATH)
-    db.pragma('journal_mode = WAL')
+    if (DB_PATH !== ':memory:') {
+      db.pragma('journal_mode = WAL')
+    }
     db.pragma('foreign_keys = ON')
     runMigrations(db)
   }

backend/src/db/migrations.ts

@@ -61,6 +61,16 @@ export function runMigrations(db: Database.Database): void {
     db.exec(`ALTER TABLE users ADD COLUMN role TEXT NOT NULL DEFAULT 'user'`);
   }
 
+  // ── Add storage_quota_bytes if missing ──
+  if (!cols.some((c) => c.name === "storage_quota_bytes")) {
+    db.exec(`ALTER TABLE users ADD COLUMN storage_quota_bytes INTEGER NOT NULL DEFAULT 1073741824`);
+  }
+
+  // ── Add plan if missing ──
+  if (!cols.some((c) => c.name === "plan")) {
+    db.exec(`ALTER TABLE users ADD COLUMN plan TEXT NOT NULL DEFAULT 'free'`);
+  }
+
   // ── Promote first user to admin if no admins exist ──
   const adminCount = db
     .prepare(`SELECT COUNT(*) AS cnt FROM users WHERE role = 'admin'`)

backend/src/index.ts

@@ -1,6 +1,8 @@
 import 'dotenv/config'
 import express from 'express'
 import cors from 'cors'
+import helmet from 'helmet'
+import rateLimit from 'express-rate-limit'
 import { getDb, closeDb } from './db/database.js'
 import authRoutes from './routes/auth.js'
 import examRoutes from './routes/exams.js'
@@ -20,9 +22,25 @@ const PORT = config.port
 
 const app = express()
 
+// Security headers
+app.use(helmet())
+
+// CORS
 app.use(cors({ origin: config.corsOrigin }))
+
+// Body parsing with reasonable limit
 app.use(express.json({ limit: config.bodyLimit }))
 
+// Global API rate limiting
+const globalLimiter = rateLimit({
+  windowMs: 15 * 60 * 1000, // 15 minutes
+  max: 200,
+  message: { error: 'Too many requests, please try again later' },
+  standardHeaders: true,
+  legacyHeaders: false,
+})
+app.use('/api/', globalLimiter)
+
 // Request logging
 app.use((req, res, next) => {
   const start = Date.now()
@@ -63,7 +81,6 @@ app.get('/api/health', (_req, res) => {
   res.status(overall === 'healthy' ? 200 : 503).json({
     status: overall,
     timestamp: Date.now(),
-    version: process.env['npm_package_version'] ?? '0.0.1',
     checks,
   })
 })

backend/src/middleware/auth.ts

@@ -1,5 +1,6 @@
 import type { Request, Response, NextFunction } from 'express'
-import { verifyToken, type JwtPayload } from '../utils/tokens.js'
+import { verifyToken, hashToken, type JwtPayload } from '../utils/tokens.js'
+import { isTokenBlacklisted } from '../utils/tokenBlacklist.js'
 
 declare global {
   namespace Express {
@@ -22,6 +23,13 @@ export function requireAuth(req: Request, res: Response, next: NextFunction): vo
   try {
     const token = header.slice(7)
     req.user = verifyToken(token)
+
+    // Check if the token has been blacklisted (e.g., after logout)
+    if (isTokenBlacklisted(hashToken(token))) {
+      res.status(401).json({ error: 'Token has been revoked' })
+      return
+    }
+
     next()
   } catch {
     res.status(401).json({ error: 'Invalid or expired token' })

backend/src/middleware/error.ts

@@ -17,15 +17,21 @@ export function errorHandler(
   _next: any
 ) {
   const statusCode = err instanceof AppError ? err.statusCode : 500;
-  const message = err.message || 'Internal Server Error';
+  const isOperational = err instanceof AppError && err.isOperational;
 
-  console.error(`[Error] ${statusCode} - ${message}`);
-  if (!(err instanceof AppError) || !err.isOperational) {
+  // Log full details server-side
+  console.error(`[Error] ${statusCode} - ${err.message}`);
+  if (!isOperational) {
     console.error(err);
   }
 
+  // Never leak internal error details to the client for unexpected 500s
+  const clientMessage = statusCode === 500 && !isOperational
+    ? 'Internal Server Error'
+    : (err.message || 'Internal Server Error');
+
   res.status(statusCode).json({
     status: 'error',
-    message,
+    message: clientMessage,
   });
-}
+}

backend/src/repositories/storageRepo.test.ts

@@ -0,0 +1,157 @@
+import { describe, it, expect } from 'vitest'
+
+// Set env vars before any module that reads them at import time
+process.env.JWT_SECRET = process.env.JWT_SECRET || 'test-secret-for-unit-tests-only'
+process.env.DB_PATH = ':memory:'
+
+// Dynamic imports ensure env vars are set before module initialisation
+const { getDb, closeDb } = await import('../db/database.js')
+const userRepo = await import('./userRepo.js')
+const storageRepo = await import('./storageRepo.js')
+
+describe('storageRepo', () => {
+  it('returns zero usage for a new user', () => {
+    const { id: userId } = userRepo.createUser({
+      email: 'storage-test@example.com',
+      passwordHash: 'hash',
+      displayName: 'Storage Test',
+      emailVerified: 1,
+    })
+
+    const usage = storageRepo.getUserStorageUsage(userId)
+    expect(usage.usedBytes).toBe(0)
+    expect(usage.examBytes).toBe(0)
+    expect(usage.resultBytes).toBe(0)
+  })
+
+  it('calculates exam JSON length correctly', () => {
+    const { id: userId } = userRepo.createUser({
+      email: 'storage-exam@example.com',
+      passwordHash: 'hash',
+      displayName: 'Exam Storage',
+      emailVerified: 1,
+    })
+
+    const db = getDb()
+    const examJson = JSON.stringify({ title: 'Test Exam', questions: [] })
+    db.prepare(`
+      INSERT INTO saved_exams (user_id, title, exam_json)
+      VALUES (?, ?, ?)
+    `).run(userId, 'Test Exam', examJson)
+
+    const usage = storageRepo.getUserStorageUsage(userId)
+    expect(usage.examBytes).toBe(examJson.length)
+    expect(usage.usedBytes).toBe(examJson.length)
+  })
+
+  it('calculates result JSON length correctly', () => {
+    const { id: userId } = userRepo.createUser({
+      email: 'storage-result@example.com',
+      passwordHash: 'hash',
+      displayName: 'Result Storage',
+      emailVerified: 1,
+    })
+
+    const db = getDb()
+    const stateJson = JSON.stringify({ answers: [1, 2, 3] })
+    const examJson = JSON.stringify({ title: 'Result Exam' })
+    db.prepare(`
+      INSERT INTO exam_results
+      (user_id, title, score_points, total_points, correct_count, graded_count, elapsed_ms, state_json, exam_json)
+      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+    `).run(userId, 'Result Exam', 10, 20, 5, 10, 60000, stateJson, examJson)
+
+    const usage = storageRepo.getUserStorageUsage(userId)
+    expect(usage.resultBytes).toBe(stateJson.length + examJson.length)
+    expect(usage.usedBytes).toBe(stateJson.length + examJson.length)
+  })
+
+  it('aggregates multiple exams and results', () => {
+    const { id: userId } = userRepo.createUser({
+      email: 'storage-multi@example.com',
+      passwordHash: 'hash',
+      displayName: 'Multi Storage',
+      emailVerified: 1,
+    })
+
+    const db = getDb()
+    const examJson1 = JSON.stringify({ title: 'Exam 1' })
+    const examJson2 = JSON.stringify({ title: 'Exam 2', extra: 'data' })
+
+    db.prepare(`INSERT INTO saved_exams (user_id, title, exam_json) VALUES (?, ?, ?)`)
+      .run(userId, 'Exam 1', examJson1)
+    db.prepare(`INSERT INTO saved_exams (user_id, title, exam_json) VALUES (?, ?, ?)`)
+      .run(userId, 'Exam 2', examJson2)
+
+    const stateJson = JSON.stringify({ answers: [] })
+    db.prepare(`
+      INSERT INTO exam_results
+      (user_id, title, score_points, total_points, correct_count, graded_count, elapsed_ms, state_json, exam_json)
+      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+    `).run(userId, 'Result', 5, 10, 3, 5, 30000, stateJson, examJson1)
+
+    const usage = storageRepo.getUserStorageUsage(userId)
+    expect(usage.examBytes).toBe(examJson1.length + examJson2.length)
+    expect(usage.resultBytes).toBe(stateJson.length + examJson1.length)
+    expect(usage.usedBytes).toBe(examJson1.length + examJson2.length + stateJson.length + examJson1.length)
+  })
+
+  it('lists storage items sorted by size desc', () => {
+    const { id: userId } = userRepo.createUser({
+      email: 'storage-items@example.com',
+      passwordHash: 'hash',
+      displayName: 'Items Storage',
+      emailVerified: 1,
+    })
+
+    const db = getDb()
+    const smallExam = JSON.stringify({ title: 'Small' })
+    const largeExam = JSON.stringify({ title: 'Large Exam', content: 'x'.repeat(100) })
+    const stateJson = JSON.stringify({ a: 'y'.repeat(50) })
+
+    db.prepare(`INSERT INTO saved_exams (user_id, title, exam_json) VALUES (?, ?, ?)`)
+      .run(userId, 'Small Exam', smallExam)
+    db.prepare(`INSERT INTO saved_exams (user_id, title, exam_json) VALUES (?, ?, ?)`)
+      .run(userId, 'Large Exam', largeExam)
+    db.prepare(`
+      INSERT INTO exam_results
+      (user_id, title, score_points, total_points, correct_count, graded_count, elapsed_ms, state_json, exam_json)
+      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+    `).run(userId, 'Result', 5, 10, 3, 5, 30000, stateJson, smallExam)
+
+    const items = storageRepo.listStorageItems(userId)
+    expect(items.length).toBe(3)
+    expect(items[0].title).toBe('Large Exam')
+    expect(items[0].type).toBe('exam')
+    expect(items[1].title).toBe('Result')
+    expect(items[1].type).toBe('result')
+    expect(items[2].title).toBe('Small Exam')
+    expect(items[2].type).toBe('exam')
+  })
+
+  it('does not include other users data', () => {
+    const { id: userA } = userRepo.createUser({
+      email: 'user-a@example.com',
+      passwordHash: 'hash',
+      displayName: 'User A',
+      emailVerified: 1,
+    })
+    const { id: userB } = userRepo.createUser({
+      email: 'user-b@example.com',
+      passwordHash: 'hash',
+      displayName: 'User B',
+      emailVerified: 1,
+    })
+
+    const db = getDb()
+    const examJson = JSON.stringify({ title: 'A Exam' })
+    db.prepare(`INSERT INTO saved_exams (user_id, title, exam_json) VALUES (?, ?, ?)`)
+      .run(userA, 'A Exam', examJson)
+
+    const usageA = storageRepo.getUserStorageUsage(userA)
+    const usageB = storageRepo.getUserStorageUsage(userB)
+
+    expect(usageA.usedBytes).toBe(examJson.length)
+    expect(usageB.usedBytes).toBe(0)
+  })
+})

backend/src/repositories/storageRepo.ts

@@ -0,0 +1,61 @@
+import { getDb } from '../db/database.js'
+
+export interface StorageUsage {
+  usedBytes: number
+  examBytes: number
+  resultBytes: number
+}
+
+export interface StorageItem {
+  id: number
+  title: string
+  type: 'exam' | 'result'
+  sizeBytes: number
+  createdAt: number
+}
+
+export function getUserStorageUsage(userId: number): StorageUsage {
+  const db = getDb()
+  const examRow = db.prepare(`
+    SELECT COALESCE(SUM(LENGTH(exam_json)), 0) AS total
+    FROM saved_exams
+    WHERE user_id = ?
+  `).get(userId) as { total: number }
+
+  const resultRow = db.prepare(`
+    SELECT COALESCE(SUM(LENGTH(state_json) + LENGTH(exam_json)), 0) AS total
+    FROM exam_results
+    WHERE user_id = ?
+  `).get(userId) as { total: number }
+
+  return {
+    usedBytes: examRow.total + resultRow.total,
+    examBytes: examRow.total,
+    resultBytes: resultRow.total,
+  }
+}
+
+export function listStorageItems(userId: number): StorageItem[] {
+  const db = getDb()
+  const exams = db.prepare(`
+    SELECT id, title, LENGTH(exam_json) AS size_bytes, created_at
+    FROM saved_exams
+    WHERE user_id = ?
+    ORDER BY size_bytes DESC
+  `).all(userId) as { id: number; title: string; size_bytes: number; created_at: number }[]
+
+  const results = db.prepare(`
+    SELECT id, title, LENGTH(state_json) + LENGTH(exam_json) AS size_bytes, completed_at AS created_at
+    FROM exam_results
+    WHERE user_id = ?
+    ORDER BY size_bytes DESC
+  `).all(userId) as { id: number; title: string; size_bytes: number; created_at: number }[]
+
+  const items: StorageItem[] = [
+    ...exams.map((e) => ({ id: e.id, title: e.title, type: 'exam' as const, sizeBytes: e.size_bytes, createdAt: e.created_at })),
+    ...results.map((r) => ({ id: r.id, title: r.title, type: 'result' as const, sizeBytes: r.size_bytes, createdAt: r.created_at })),
+  ]
+
+  items.sort((a, b) => b.sizeBytes - a.sizeBytes)
+  return items
+}

backend/src/repositories/userRepo.ts

@@ -11,6 +11,8 @@ export interface DbUser {
   verify_expires: number | null
   reset_token: string | null
   reset_expires: number | null
+  storage_quota_bytes: number
+  plan: string
   created_at: number
   updated_at: number
 }
@@ -23,6 +25,8 @@ export interface CreateUserData {
   emailVerified?: number
   verifyToken?: string | null
   verifyExpires?: number | null
+  storageQuotaBytes?: number
+  plan?: string
 }
 
 export interface UpdateUserData {
@@ -34,13 +38,15 @@ export interface UpdateUserData {
   verifyExpires?: number | null
   resetToken?: string | null
   resetExpires?: number | null
+  storageQuotaBytes?: number
+  plan?: string
 }
 
 export function createUser(data: CreateUserData): { id: number } {
   const db = getDb()
   const result = db.prepare(`
-    INSERT INTO users (email, password_hash, display_name, role, email_verified, verify_token, verify_expires)
-    VALUES (?, ?, ?, ?, ?, ?, ?)
+    INSERT INTO users (email, password_hash, display_name, role, email_verified, verify_token, verify_expires, storage_quota_bytes, plan)
+    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
   `).run(
     data.email.toLowerCase().trim(),
     data.passwordHash,
@@ -48,7 +54,9 @@ export function createUser(data: CreateUserData): { id: number } {
     data.role ?? 'user',
     data.emailVerified ?? 1,
     data.verifyToken ?? null,
-    data.verifyExpires ?? null
+    data.verifyExpires ?? null,
+    data.storageQuotaBytes ?? 1073741824,
+    data.plan ?? 'free'
   )
   return { id: result.lastInsertRowid as number }
 }
@@ -63,14 +71,14 @@ export function getUserById(id: number): DbUser | undefined {
   return db.prepare('SELECT * FROM users WHERE id = ?').get(id) as DbUser | undefined
 }
 
-export function getUserByVerifyToken(token: string): DbUser | undefined {
+export function getUserByVerifyTokenHash(tokenHash: string): DbUser | undefined {
   const db = getDb()
-  return db.prepare('SELECT * FROM users WHERE verify_token = ?').get(token) as DbUser | undefined
+  return db.prepare('SELECT * FROM users WHERE verify_token = ?').get(tokenHash) as DbUser | undefined
 }
 
-export function getUserByResetToken(token: string): DbUser | undefined {
+export function getUserByResetTokenHash(tokenHash: string): DbUser | undefined {
   const db = getDb()
-  return db.prepare('SELECT * FROM users WHERE reset_token = ?').get(token) as DbUser | undefined
+  return db.prepare('SELECT * FROM users WHERE reset_token = ?').get(tokenHash) as DbUser | undefined
 }
 
 export function updateUser(id: number, data: UpdateUserData): boolean {
@@ -110,6 +118,14 @@ export function updateUser(id: number, data: UpdateUserData): boolean {
     fields.push('reset_expires = ?')
     values.push(data.resetExpires)
   }
+  if (data.storageQuotaBytes !== undefined) {
+    fields.push('storage_quota_bytes = ?')
+    values.push(data.storageQuotaBytes)
+  }
+  if (data.plan !== undefined) {
+    fields.push('plan = ?')
+    values.push(data.plan)
+  }
 
   if (fields.length === 0) return false
 

backend/src/routes/admin.ts

@@ -6,7 +6,7 @@ import { AppError } from '../middleware/error.js'
 import * as userRepo from '../repositories/userRepo.js'
 import * as resultRepo from '../repositories/resultRepo.js'
 import * as settingsRepo from '../repositories/settingsRepo.js'
-import { updateUserRoleSchema, updateSettingSchema, listUsersQuerySchema, userIdParamSchema } from '../validators/adminSchemas.js'
+import { updateUserRoleSchema, updateSettingSchema, updateSettingsBatchSchema, listUsersQuerySchema, userIdParamSchema } from '../validators/adminSchemas.js'
 import type { Request } from 'express'
 
 const router = Router()
@@ -124,17 +124,18 @@ router.get(
 router.get(
   '/settings',
   asyncHandler(async (_req, res) => {
-    res.json(settingsRepo.getAllSettings())
+    res.json({ settings: settingsRepo.getAllSettings() })
   })
 )
 
 // PUT /api/admin/settings
 router.put(
   '/settings',
-  validateBody(updateSettingSchema),
+  validateBody(updateSettingsBatchSchema),
   asyncHandler(async (req: Request, res) => {
-    const { key, value } = req.body
-    settingsRepo.setSetting(key, value)
+    const { settings } = req.body
+    const entries = Object.entries(settings) as Array<[string, string]>
+    settingsRepo.setSettingsBatch(entries)
     res.json({ success: true })
   })
 )

backend/src/routes/auth.ts

@@ -5,6 +5,8 @@ import { requireAuth } from '../middleware/auth.js'
 import { asyncHandler } from '../utils/asyncHandler.js'
 import * as authService from '../services/authService.js'
 import * as userRepo from '../repositories/userRepo.js'
+import { hashToken } from '../utils/tokens.js'
+import { blacklistToken } from '../utils/tokenBlacklist.js'
 import {
   registerSchema,
   loginSchema,
@@ -113,6 +115,23 @@ router.post(
   })
 )
 
+// POST /api/auth/logout
+router.post(
+  '/logout',
+  requireAuth,
+  asyncHandler(async (req: Request, res) => {
+    const header = req.headers.authorization
+    if (header?.startsWith('Bearer ')) {
+      const token = header.slice(7)
+      const tokenHash = hashToken(token)
+      // Blacklist the token so it cannot be reused after logout
+      // Expiry is 24h from now (matching JWT expiry)
+      blacklistToken(tokenHash, Date.now() + 24 * 60 * 60 * 1000)
+    }
+    res.json({ success: true })
+  })
+)
+
 // DELETE /api/auth/me
 router.delete(
   '/me',

backend/src/routes/exams.ts

@@ -5,6 +5,7 @@ import { requireAuth } from '../middleware/auth.js'
 import { AppError } from '../middleware/error.js'
 import * as examRepo from '../repositories/examRepo.js'
 import { saveExamSchema, updateExamSchema, examIdParamSchema } from '../validators/examSchemas.js'
+import { sanitizeExam } from '../utils/sanitizeExam.js'
 import type { Request } from 'express'
 
 const router = Router()
@@ -41,7 +42,7 @@ router.post(
   '/',
   validateBody(saveExamSchema),
   asyncHandler(async (req: Request, res) => {
-    const exam = req.body.exam
+    const exam = sanitizeExam(req.body.exam) as typeof req.body.exam
     const { id } = examRepo.createExam(
       req.user!.userId,
       exam.title,
@@ -59,7 +60,7 @@ router.put(
   validateBody(updateExamSchema),
   asyncHandler(async (req: Request, res) => {
     const id = Number(req.params.id)
-    const exam = req.body.exam
+    const exam = sanitizeExam(req.body.exam) as typeof req.body.exam
     const updated = examRepo.updateExam(
       id,
       req.user!.userId,

backend/src/routes/setup.ts

@@ -3,6 +3,7 @@ import bcrypt from 'bcrypt'
 import { validateBody } from '../middleware/validate.js'
 import { asyncHandler } from '../utils/asyncHandler.js'
 import { AppError } from '../middleware/error.js'
+import { getDb } from '../db/database.js'
 import * as userRepo from '../repositories/userRepo.js'
 import * as settingsRepo from '../repositories/settingsRepo.js'
 import { setupSchema } from '../validators/setupSchemas.js'
@@ -13,7 +14,7 @@ const router = Router()
 const SALT_ROUNDS = 10
 
 function getSiteTitle(): string | null {
-  return settingsRepo.getSetting('site_title') ?? null
+  return settingsRepo.getSetting('site_name') ?? null
 }
 
 // GET /api/setup/status
@@ -33,54 +34,65 @@ router.post(
   '/',
   validateBody(setupSchema),
   asyncHandler(async (req, res) => {
-    if (getSiteTitle()) {
-      throw new AppError(400, 'Setup already completed')
-    }
+    const db = getDb()
 
-    if (userRepo.countUsers() > 0) {
-      throw new AppError(400, 'Users already exist')
-    }
+    // Atomic transaction prevents race conditions between concurrent setup requests
+    const tx = db.transaction(() => {
+      const title = settingsRepo.getSetting('site_name')
+      if (title) {
+        throw new AppError(400, 'Setup already completed')
+      }
 
-    const {
-      email,
-      password,
-      displayName,
-      siteTitle,
-      language,
-      smtpHost,
-      smtpPort,
-      smtpUser,
-      smtpPass,
-      smtpFrom,
-      smtpSecure,
-      appUrl,
-    } = req.body
+      const userCount = userRepo.countUsers()
+      if (userCount > 0) {
+        throw new AppError(400, 'Users already exist')
+      }
 
-    const passwordHash = await bcrypt.hash(password, SALT_ROUNDS)
+      const {
+        email,
+        password,
+        displayName,
+        siteTitle,
+        language,
+        smtpHost,
+        smtpPort,
+        smtpUser,
+        smtpPass,
+        smtpFrom,
+        smtpSecure,
+        appUrl,
+      } = req.body
 
-    const { id } = userRepo.createUser({
-      email,
-      passwordHash,
-      displayName,
-      role: 'admin',
-      emailVerified: 1,
+      const passwordHash = bcrypt.hashSync(password, SALT_ROUNDS)
+
+      const { id } = userRepo.createUser({
+        email,
+        passwordHash,
+        displayName,
+        role: 'admin',
+        emailVerified: 1,
+      })
+
+      const settings: Array<[string, string]> = [
+        ['site_name', siteTitle?.trim() || 'BrainWave'],
+        ['site_language', language || 'en'],
+        ['maintenance_mode', 'false'],
+      ]
+
+      if (smtpHost !== undefined) settings.push(['smtp_host', smtpHost])
+      if (smtpPort !== undefined) settings.push(['smtp_port', smtpPort])
+      if (smtpUser !== undefined) settings.push(['smtp_user', smtpUser])
+      if (smtpPass !== undefined) settings.push(['smtp_pass', smtpPass])
+      if (smtpFrom !== undefined) settings.push(['smtp_from', smtpFrom])
+      if (smtpSecure !== undefined) settings.push(['smtp_secure', smtpSecure])
+      if (appUrl !== undefined) settings.push(['app_url', appUrl])
+
+      settingsRepo.setSettingsBatch(settings)
+
+      return { id, email, displayName }
     })
 
-    const settings: Array<[string, string]> = [
-      ['site_title', siteTitle?.trim() || 'BrainWave'],
-      ['site_language', language || 'en'],
-      ['maintenance_mode', 'false'],
-    ]
-
-    if (smtpHost !== undefined) settings.push(['smtp_host', smtpHost])
-    if (smtpPort !== undefined) settings.push(['smtp_port', smtpPort])
-    if (smtpUser !== undefined) settings.push(['smtp_user', smtpUser])
-    if (smtpPass !== undefined) settings.push(['smtp_pass', smtpPass])
-    if (smtpFrom !== undefined) settings.push(['smtp_from', smtpFrom])
-    if (smtpSecure !== undefined) settings.push(['smtp_secure', smtpSecure])
-    if (appUrl !== undefined) settings.push(['app_url', appUrl])
-
-    settingsRepo.setSettingsBatch(settings)
+    const { id, email, displayName } = tx()
 
     const token = signToken({
       userId: id,

backend/src/services/authService.ts

@@ -1,8 +1,9 @@
 import bcrypt from 'bcrypt'
 import * as userRepo from '../repositories/userRepo.js'
-import { signToken, generateVerificationToken } from '../utils/tokens.js'
+import { signToken, generateVerificationToken, hashToken } from '../utils/tokens.js'
 import { sendVerificationEmail, sendPasswordResetEmail } from '../utils/email.js'
 import { AppError } from '../middleware/error.js'
+import * as storageRepo from '../repositories/storageRepo.js'
 import type { RegisterInput, LoginInput, UpdateProfileInput, ChangePasswordInput, VerifyEmailInput, ResetPasswordInput } from '../validators/authSchemas.js'
 
 const SALT_ROUNDS = 10
@@ -22,7 +23,8 @@ export async function register(input: RegisterInput, isFirstUser: boolean): Prom
 
   const passwordHash = await bcrypt.hash(input.password, SALT_ROUNDS)
   const role = isFirstUser ? 'admin' : 'user'
-  const verifyToken = generateVerificationToken()
+  const rawVerifyToken = generateVerificationToken()
+  const verifyTokenHash = hashToken(rawVerifyToken)
   const verifyExpires = Date.now() + VERIFY_TOKEN_EXPIRY_MS
 
   const { id } = userRepo.createUser({
@@ -31,14 +33,14 @@ export async function register(input: RegisterInput, isFirstUser: boolean): Prom
     displayName: input.displayName,
     role,
     emailVerified: 0,
-    verifyToken,
+    verifyToken: verifyTokenHash,
     verifyExpires,
   })
 
   const user = userRepo.getUserById(id)!
 
   // Don't await — fire and forget so registration isn't blocked by email failures
-  sendVerificationEmail(user.email, verifyToken).catch(() => {})
+  sendVerificationEmail(user.email, rawVerifyToken).catch(() => {})
 
   return {
     token: signToken({
@@ -67,6 +69,10 @@ export async function login(input: LoginInput): Promise<AuthResult> {
     throw new AppError(401, 'Invalid email or password')
   }
 
+  if (!user.email_verified) {
+    throw new AppError(403, 'Please verify your email before logging in')
+  }
+
   return {
     token: signToken({
       userId: user.id,
@@ -88,12 +94,20 @@ export function getMe(userId: number) {
   if (!user) {
     throw new AppError(404, 'User not found')
   }
+  const usage = storageRepo.getUserStorageUsage(userId)
+  const usedPercent = user.storage_quota_bytes > 0
+    ? Math.round((usage.usedBytes / user.storage_quota_bytes) * 100)
+    : 0
   return {
     id: user.id,
     email: user.email,
     displayName: user.display_name,
     role: user.role,
     emailVerified: !!user.email_verified,
+    storageQuotaBytes: user.storage_quota_bytes,
+    usedBytes: usage.usedBytes,
+    usedPercent,
+    plan: user.plan,
   }
 }
 
@@ -118,7 +132,8 @@ export async function changePassword(userId: number, input: ChangePasswordInput)
 }
 
 export async function verifyEmail(input: VerifyEmailInput) {
-  const user = userRepo.getUserByVerifyToken(input.token)
+  const tokenHash = hashToken(input.token)
+  const user = userRepo.getUserByVerifyTokenHash(tokenHash)
   if (!user || !user.verify_expires || Date.now() > user.verify_expires) {
     throw new AppError(400, 'Invalid or expired verification token')
   }
@@ -141,17 +156,19 @@ export async function forgotPassword(email?: string) {
     return
   }
 
-  const resetToken = generateVerificationToken()
+  const rawResetToken = generateVerificationToken()
+  const resetTokenHash = hashToken(rawResetToken)
   const resetExpires = Date.now() + RESET_TOKEN_EXPIRY_MS
 
-  userRepo.updateUser(user.id, { resetToken, resetExpires })
+  userRepo.updateUser(user.id, { resetToken: resetTokenHash, resetExpires })
 
   // Fire and forget
-  sendPasswordResetEmail(user.email, resetToken).catch(() => {})
+  sendPasswordResetEmail(user.email, rawResetToken).catch(() => {})
 }
 
 export async function resetPassword(input: ResetPasswordInput) {
-  const user = userRepo.getUserByResetToken(input.token)
+  const tokenHash = hashToken(input.token)
+  const user = userRepo.getUserByResetTokenHash(tokenHash)
   if (!user || !user.reset_expires || Date.now() > user.reset_expires) {
     throw new AppError(400, 'Invalid or expired reset token')
   }

backend/src/utils/sanitizeExam.ts

@@ -0,0 +1,30 @@
+/**
+ * Server-side sanitization for user-provided exam content.
+ * Removes script tags and event handlers from string fields.
+ */
+
+function sanitizeString(value: unknown): unknown {
+  if (typeof value !== 'string') return value
+  return value
+    .replace(/<script[^>]*>[\s\S]*?<\/script>/gi, '')
+    .replace(/<script[^>]*\/>/gi, '')
+    .replace(/javascript:/gi, '')
+    .replace(/on\w+\s*=/gi, '')
+}
+
+function sanitizeObject(obj: unknown): unknown {
+  if (typeof obj === 'string') return sanitizeString(obj)
+  if (Array.isArray(obj)) return obj.map(sanitizeObject)
+  if (obj && typeof obj === 'object') {
+    const result: Record<string, unknown> = {}
+    for (const [key, val] of Object.entries(obj)) {
+      result[key] = sanitizeObject(val)
+    }
+    return result
+  }
+  return obj
+}
+
+export function sanitizeExam(exam: Record<string, unknown>): Record<string, unknown> {
+  return sanitizeObject(exam) as Record<string, unknown>
+}

backend/src/utils/tokenBlacklist.ts

@@ -0,0 +1,46 @@
+/**
+ * In-memory token blacklist with SQLite persistence.
+ * Tokens are blacklisted on logout and expire automatically based on JWT expiry.
+ */
+
+import { getDb } from '../db/database.js'
+
+const memoryCache = new Set<string>()
+let initialized = false
+
+function initCache(): void {
+  if (initialized) return
+  const db = getDb()
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS token_blacklist (
+      token_hash TEXT PRIMARY KEY,
+      expires_at INTEGER NOT NULL
+    );
+    CREATE INDEX IF NOT EXISTS idx_token_blacklist_expires ON token_blacklist(expires_at);
+  `)
+  // Load recent blacklisted tokens into memory
+  const rows = db.prepare('SELECT token_hash FROM token_blacklist WHERE expires_at > ?')
+    .all(Date.now()) as { token_hash: string }[]
+  for (const row of rows) {
+    memoryCache.add(row.token_hash)
+  }
+  initialized = true
+}
+
+export function isTokenBlacklisted(tokenHash: string): boolean {
+  initCache()
+  return memoryCache.has(tokenHash)
+}
+
+export function blacklistToken(tokenHash: string, expiresAt: number): void {
+  initCache()
+  memoryCache.add(tokenHash)
+  const db = getDb()
+  db.prepare('INSERT OR IGNORE INTO token_blacklist (token_hash, expires_at) VALUES (?, ?)')
+    .run(tokenHash, expiresAt)
+}
+
+export function cleanupExpiredTokens(): void {
+  const db = getDb()
+  db.prepare('DELETE FROM token_blacklist WHERE expires_at <= ?').run(Date.now())
+}

backend/src/utils/tokens.ts

@@ -20,3 +20,7 @@ export function verifyToken(token: string): JwtPayload {
 export function generateVerificationToken(): string {
   return crypto.randomBytes(32).toString('hex')
 }
+
+export function hashToken(token: string): string {
+  return crypto.createHash('sha256').update(token).digest('hex')
+}

backend/src/validators/adminSchemas.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest'
-import { updateUserRoleSchema, updateSettingSchema, listUsersQuerySchema, userIdParamSchema } from './adminSchemas'
+import { updateUserRoleSchema, updateSettingSchema, updateSettingsBatchSchema, listUsersQuerySchema, userIdParamSchema } from './adminSchemas'
 
 describe('updateUserRoleSchema', () => {
   it('accepts valid role change', () => {
@@ -20,7 +20,7 @@ describe('updateUserRoleSchema', () => {
 
 describe('updateSettingSchema', () => {
   it('accepts valid setting', () => {
-    const result = updateSettingSchema.safeParse({ key: 'app_name', value: 'BrainWave' })
+    const result = updateSettingSchema.safeParse({ key: 'site_name', value: 'BrainWave' })
     expect(result.success).toBe(true)
   })
 
@@ -30,7 +30,30 @@ describe('updateSettingSchema', () => {
   })
 
   it('rejects empty value', () => {
-    const result = updateSettingSchema.safeParse({ key: 'app_name', value: '' })
+    const result = updateSettingSchema.safeParse({ key: 'site_name', value: '' })
+    expect(result.success).toBe(false)
+  })
+})
+
+describe('updateSettingsBatchSchema', () => {
+  it('accepts valid batch', () => {
+    const result = updateSettingsBatchSchema.safeParse({
+      settings: { site_name: 'BrainWave', maintenance_mode: 'false' },
+    })
+    expect(result.success).toBe(true)
+  })
+
+  it('rejects invalid key in batch', () => {
+    const result = updateSettingsBatchSchema.safeParse({
+      settings: { site_name: 'BrainWave', unknown_key: 'value' },
+    })
+    expect(result.success).toBe(false)
+  })
+
+  it('rejects empty value in batch', () => {
+    const result = updateSettingsBatchSchema.safeParse({
+      settings: { site_name: '' },
+    })
     expect(result.success).toBe(false)
   })
 })

backend/src/validators/adminSchemas.ts

@@ -5,11 +5,36 @@ export const updateUserRoleSchema = z.object({
   role: z.enum(['user', 'admin']),
 })
 
+const ALLOWED_SETTING_KEYS = [
+  'site_name',
+  'site_language',
+  'maintenance_mode',
+  'maintenance_message',
+  'allow_guest_mode',
+  'registration_enabled',
+  'default_theme',
+  'smtp_host',
+  'smtp_port',
+  'smtp_user',
+  'smtp_pass',
+  'smtp_from',
+  'smtp_secure',
+  'app_url',
+  'max_upload_mb',
+] as const
+
 export const updateSettingSchema = z.object({
-  key: z.string().min(1),
+  key: z.enum(ALLOWED_SETTING_KEYS),
   value: z.string().min(1),
 })
 
+export const updateSettingsBatchSchema = z.object({
+  settings: z.record(z.string().min(1)).refine(
+    (obj) => Object.keys(obj).every((k) => ALLOWED_SETTING_KEYS.includes(k as typeof ALLOWED_SETTING_KEYS[number])),
+    { message: 'One or more setting keys are not allowed' }
+  ),
+})
+
 export const listUsersQuerySchema = z.object({
   page: z.string().regex(/^\d+$/).optional().transform((v: string | undefined) => (v ? Number(v) : 1)),
   search: z.string().optional(),

backend/src/validators/authSchemas.test.ts

@@ -5,7 +5,7 @@ describe('registerSchema', () => {
   it('accepts valid registration', () => {
     const result = registerSchema.safeParse({
       email: 'test@example.com',
-      password: 'password123',
+      password: 'Password123!',
       displayName: 'Test User',
     })
     expect(result.success).toBe(true)
@@ -14,7 +14,7 @@ describe('registerSchema', () => {
   it('rejects invalid email', () => {
     const result = registerSchema.safeParse({
       email: 'not-an-email',
-      password: 'password123',
+      password: 'Password123!',
       displayName: 'Test User',
     })
     expect(result.success).toBe(false)
@@ -32,7 +32,7 @@ describe('registerSchema', () => {
   it('rejects empty display name', () => {
     const result = registerSchema.safeParse({
       email: 'test@example.com',
-      password: 'password123',
+      password: 'Password123!',
       displayName: '',
     })
     expect(result.success).toBe(false)
@@ -65,7 +65,7 @@ describe('verifyEmailSchema', () => {
 
 describe('resetPasswordSchema', () => {
   it('accepts valid reset', () => {
-    const result = resetPasswordSchema.safeParse({ token: 'abc', newPassword: 'newpass123' })
+    const result = resetPasswordSchema.safeParse({ token: 'abc', newPassword: 'NewPass123!' })
     expect(result.success).toBe(true)
   })
 
@@ -91,7 +91,7 @@ describe('changePasswordSchema', () => {
   it('accepts valid change', () => {
     const result = changePasswordSchema.safeParse({
       currentPassword: 'oldpass',
-      newPassword: 'newpass123',
+      newPassword: 'NewPass123!',
     })
     expect(result.success).toBe(true)
   })

backend/src/validators/authSchemas.ts

@@ -1,8 +1,12 @@
 import { z } from 'zod'
 
+const passwordRegex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/
+
 export const registerSchema = z.object({
   email: z.string().email().max(255),
-  password: z.string().min(8, 'Password must be at least 8 characters'),
+  password: z.string()
+    .min(8, 'Password must be at least 8 characters')
+    .regex(passwordRegex, 'Password must contain at least one uppercase letter, one lowercase letter, one number, and one special character (@$!%*?&)'),
   displayName: z.string().min(1, 'Display name is required').max(100),
 })
 
@@ -17,7 +21,9 @@ export const verifyEmailSchema = z.object({
 
 export const resetPasswordSchema = z.object({
   token: z.string().min(1, 'Token is required'),
-  newPassword: z.string().min(8, 'Password must be at least 8 characters'),
+  newPassword: z.string()
+    .min(8, 'Password must be at least 8 characters')
+    .regex(passwordRegex, 'Password must contain at least one uppercase letter, one lowercase letter, one number, and one special character (@$!%*?&)'),
 })
 
 export const updateProfileSchema = z.object({
@@ -26,7 +32,9 @@ export const updateProfileSchema = z.object({
 
 export const changePasswordSchema = z.object({
   currentPassword: z.string(),
-  newPassword: z.string().min(8, 'Password must be at least 8 characters'),
+  newPassword: z.string()
+    .min(8, 'Password must be at least 8 characters')
+    .regex(passwordRegex, 'Password must contain at least one uppercase letter, one lowercase letter, one number, and one special character (@$!%*?&)'),
 })
 
 export const forgotPasswordSchema = z.object({

backend/src/validators/setupSchemas.test.ts

@@ -5,7 +5,7 @@ describe('setupSchema', () => {
   it('accepts valid setup', () => {
     const result = setupSchema.safeParse({
       email: 'admin@example.com',
-      password: 'adminpass123',
+      password: 'AdminPass123!',
       displayName: 'Admin',
       siteTitle: 'BrainWave',
       language: 'en',
@@ -16,7 +16,7 @@ describe('setupSchema', () => {
   it('rejects invalid email', () => {
     const result = setupSchema.safeParse({
       email: 'bad',
-      password: 'adminpass123',
+      password: 'AdminPass123!',
       displayName: 'Admin',
     })
     expect(result.success).toBe(false)

backend/src/validators/setupSchemas.ts

@@ -1,8 +1,12 @@
 import { z } from 'zod'
 
+const passwordRegex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/
+
 export const setupSchema = z.object({
   email: z.string().email().max(255),
-  password: z.string().min(8, 'Password must be at least 8 characters'),
+  password: z.string()
+    .min(8, 'Password must be at least 8 characters')
+    .regex(passwordRegex, 'Password must contain at least one uppercase letter, one lowercase letter, one number, and one special character (@$!%*?&)'),
   displayName: z.string().min(1, 'Display name is required').max(100),
   siteTitle: z.string().min(1, 'Site title is required').max(255).optional(),
   language: z.enum(['en', 'nl']).optional(),

frontend/src/App.tsx

@@ -129,7 +129,7 @@ function AppInner() {
     setExamState(withNotes(state));
   };
 
-  const loadExam = (data: Exam, saveToWorkspace = false, examId?: number | null) => {
+  const loadExam = (data: Exam, saveToWorkspace = false, examId?: number | null, isRedo = false) => {
     if (saveToWorkspace && user && isAuthenticated()) {
       examApi.createExam(data)
         .then((res) => {
@@ -156,6 +156,7 @@ function AppInner() {
         revealed: {},
         startedAt: Date.now(),
         feedbackMode: fm,
+        isRedo,
       });
     });
     navigate(`/exam/${getExamUrlId(data)}/q1`);
@@ -195,33 +196,60 @@ function AppInner() {
       state: { ...examState, completedAt },
     };
 
-    if (user && isAuthenticated()) {
-      void resultApi.submitResult({
-        exam_id: savedExamIdRef.current,
-        title: entry.title,
-        score_points: entry.scorePoints,
-        total_points: entry.totalPoints,
-        correct_count: entry.correctCount,
-        graded_count: entry.gradedCount,
-        passing_score: entry.passingScore,
-        elapsed_ms: entry.elapsedMs,
-        state: entry.state as unknown,
-        exam: entry.exam as unknown,
-      }).then((data) => {
-        sessionStorage.setItem('brainwave.pendingResultId', String(data.id));
-      }).catch(() => {
+    // Skip saving to history / API when this is a redo session
+    if (!examState.isRedo) {
+      if (user && isAuthenticated()) {
+        void resultApi.submitResult({
+          exam_id: savedExamIdRef.current,
+          title: entry.title,
+          score_points: entry.scorePoints,
+          total_points: entry.totalPoints,
+          correct_count: entry.correctCount,
+          graded_count: entry.gradedCount,
+          passing_score: entry.passingScore,
+          elapsed_ms: entry.elapsedMs,
+          state: entry.state as unknown,
+          exam: entry.exam as unknown,
+        }).then((data) => {
+          sessionStorage.setItem('brainwave.pendingResultId', String(data.id));
+        }).catch(() => {
+          appendHistory(entry);
+        });
+      } else {
         appendHistory(entry);
-      });
-    } else {
-      appendHistory(entry);
+      }
+
+      setHistory((prev) => [entry, ...prev]);
     }
 
-    setHistory((prev) => [entry, ...prev]);
     clearState();
     setExamState((s) => (s ? { ...s, completedAt } : s));
     navigate("/results");
   }, [exam, examState, user, navigate]);
 
+  const redoFailed = useCallback(() => {
+    if (!exam || !examState) return;
+    const graded = exam.questions.map((q) =>
+      gradeQuestion(q, examState.answers[q.id]),
+    );
+    const failedQuestions = exam.questions
+      .map((q, i) => ({ q, result: graded[i] }))
+      .filter(({ result }) => !result.correct)
+      .map(({ q }) => q);
+
+    if (failedQuestions.length === 0) return;
+
+    // Shuffle failed questions using Fisher-Yates
+    const shuffled = [...failedQuestions];
+    for (let i = shuffled.length - 1; i > 0; i--) {
+      const j = Math.floor(Math.random() * (i + 1));
+      [shuffled[i], shuffled[j]] = [shuffled[j], shuffled[i]];
+    }
+
+    const redoExam: Exam = { ...exam, questions: shuffled };
+    loadExam(redoExam, false, savedExamIdRef.current, true);
+  }, [exam, examState]);
+
   const exit = () => {
     setExam(null);
     setExamState(null);
@@ -261,6 +289,21 @@ function AppInner() {
     }
   };
 
+  const retakeAttempt = (entry: HistoryEntry) => {
+    const remoteId = (entry as HistoryEntry & { _remoteId?: number })._remoteId;
+    if (remoteId && user && isAuthenticated()) {
+      void resultApi.getResult(remoteId)
+        .then((data) => {
+          loadExam(data.exam as unknown as Exam, false, null, false);
+        })
+        .catch(() => {
+          loadExam(entry.exam, false, null, false);
+        });
+    } else {
+      loadExam(entry.exam, false, null, false);
+    }
+  };
+
   const clearAllHistory = () => {
     if (confirm(t('landing.clearHistoryConfirm'))) {
       clearHistory();
@@ -436,6 +479,7 @@ function AppInner() {
               onResume={resume}
               onClearHistory={clearAllHistory}
               onReviewAttempt={reviewAttempt}
+              onRetakeAttempt={retakeAttempt}
             />
           }
         />
@@ -461,6 +505,7 @@ function AppInner() {
                 state={examState}
                 onRestart={restart}
                 onExit={exit}
+                onRedoFailed={redoFailed}
                 reviewOnly={false}
               />
             ) : user && isAuthenticated() ? (

frontend/src/api/authApi.ts

@@ -6,6 +6,10 @@ export interface User {
   displayName: string
   role: string
   emailVerified?: boolean
+  storageQuotaBytes?: number
+  usedBytes?: number
+  usedPercent?: number
+  plan?: string
 }
 
 export interface AuthResponse {

frontend/src/components/Landing.tsx

@@ -11,6 +11,7 @@ interface Props {
   onResume: () => void
   onClearHistory: () => void
   onReviewAttempt: (entry: HistoryEntry) => void
+  onRetakeAttempt?: (entry: HistoryEntry) => void
 }
 
 const SAMPLES = [
@@ -19,7 +20,7 @@ const SAMPLES = [
   { path: '/samples/mixed-demo.json', title: 'Mixed Demo — Every Question Type', meta: '4 questions · Untimed · Media', mark: '◇' },
 ]
 
-export default function Landing({ onLoadExam, history, onResume, onClearHistory, onReviewAttempt }: Readonly<Props>) {
+export default function Landing({ onLoadExam, history, onResume, onClearHistory, onReviewAttempt, onRetakeAttempt }: Readonly<Props>) {
   const { t } = useTranslation()
   const [err, setErr] = useState<string | null>(null)
   const [dragOver, setDragOver] = useState(false)
@@ -483,6 +484,9 @@ Set a 20-minute time limit. Include explanations for each answer."
                 </div>
                 <div className="mono muted" style={{ fontSize: 12 }}>{formatTime(h.elapsedMs)}</div>
                 <div className={`score-pill ${passed ? 'pass' : 'fail'}`}>{pct}%</div>
+                {onRetakeAttempt && (
+                  <button className="btn btn-ghost btn-sm" onClick={() => onRetakeAttempt(h)}>{t('landing.retake')}</button>
+                )}
                 <button className="btn btn-ghost btn-sm" onClick={() => onReviewAttempt(h)}>{t('landing.review')}</button>
               </div>
             )

frontend/src/components/MyResults.tsx

@@ -2,7 +2,9 @@ import { useState, useEffect, useCallback } from 'react'
 import { useNavigate } from 'react-router-dom'
 import { useTranslation } from 'react-i18next'
 import * as resultApi from '../api/resultApi'
+import * as examApi from '../api/examApi'
 import { getExamUrlId } from '../utils/slug'
+import type { Exam } from '../types'
 
 interface ResultItem {
   id: number
@@ -17,7 +19,11 @@ interface ResultItem {
   exam_id: number | null
 }
 
-export default function MyResults() {
+interface Props {
+  onLoadExam: (exam: Exam, saveToWorkspace?: boolean, examId?: number | null) => void
+}
+
+export default function MyResults({ onLoadExam }: Props) {
   const { t } = useTranslation()
   const navigate = useNavigate()
   const [results, setResults] = useState<ResultItem[]>([])
@@ -25,6 +31,7 @@ export default function MyResults() {
   const [loading, setLoading] = useState(true)
   const [error, setError] = useState<string | null>(null)
   const [deleteConfirm, setDeleteConfirm] = useState<number | null>(null)
+  const [retakingId, setRetakingId] = useState<number | null>(null)
 
   const loadResults = useCallback(async () => {
     setLoading(true)
@@ -54,6 +61,18 @@ export default function MyResults() {
     }
   }
 
+  const retakeExam = async (item: ResultItem) => {
+    if (!item.exam_id) return
+    setRetakingId(item.id)
+    try {
+      const exam = await examApi.getExam(item.exam_id)
+      onLoadExam(exam, false, item.exam_id)
+    } catch (e) {
+      setError((e as Error).message)
+      setRetakingId(null)
+    }
+  }
+
   const reviewResult = async (item: ResultItem) => {
     try {
       const data = await resultApi.getResult(item.id)
@@ -129,6 +148,14 @@ export default function MyResults() {
                 </div>
                 <div className="workspace-card-actions" style={{ gap: 8 }}>
                   <div className={`score-pill ${passed ? 'pass' : 'fail'}`}>{pct}%</div>
+                  <button
+                    className="btn btn-primary btn-sm"
+                    onClick={() => void retakeExam(r)}
+                    disabled={retakingId === r.id || !r.exam_id}
+                    title={r.exam_id ? undefined : t('results.cantRetake')}
+                  >
+                    {retakingId === r.id ? t('common.loading') : t('results.retakeExam')}
+                  </button>
                   <button className="btn btn-sm" onClick={() => void reviewResult(r)}>
                     {t('common.edit')}
                   </button>

frontend/src/components/Results.tsx

@@ -12,10 +12,11 @@ interface Props {
   state: ExamState
   onRestart: () => void
   onExit: () => void
+  onRedoFailed?: () => void
   reviewOnly?: boolean
 }
 
-export default function Results({ exam, state, onRestart, onExit, reviewOnly }: Props) {
+export default function Results({ exam, state, onRestart, onExit, onRedoFailed, reviewOnly }: Props) {
   const { t } = useTranslation()
   const { answers, startedAt, completedAt } = state
   const elapsedMs = (completedAt ?? Date.now()) - startedAt
@@ -30,6 +31,7 @@ export default function Results({ exam, state, onRestart, onExit, reviewOnly }:
   const scorePoints = graded.reduce((a, g) => a + g.result.points, 0)
   const gradedCount = graded.filter((g) => g.result.status !== 'ungraded').length
   const correctCount = graded.filter((g) => g.result.correct).length
+  const failedCount = gradedCount - correctCount
   const pct = totalPoints ? Math.round((scorePoints / totalPoints) * 100) : 0
   const passing = exam.passingScore ?? 60
   const passed = pct >= passing
@@ -137,7 +139,16 @@ export default function Results({ exam, state, onRestart, onExit, reviewOnly }:
       })}
 
       <div style={{ marginTop: 48, display: 'flex', gap: 12 }}>
-        {!reviewOnly && <button className="btn btn-primary" onClick={onRestart}>{t('results.retakeExam')}</button>}
+        {!reviewOnly && (
+          <>
+            <button className="btn btn-primary" onClick={onRestart}>{t('results.retakeExam')}</button>
+            {onRedoFailed && failedCount > 0 && (
+              <button className="btn" onClick={onRedoFailed}>
+                {t('results.redoFailed')}
+              </button>
+            )}
+          </>
+        )}
         <button className="btn" onClick={onExit}>{t('results.backToHome')}</button>
       </div>
     </div>

frontend/src/components/Settings.tsx

@@ -25,6 +25,54 @@ function Seg<K extends string>({ value, options, onChange }: {
   )
 }
 
+function formatBytes(bytes: number): string {
+  if (bytes === 0) return '0 B'
+  const k = 1024
+  const sizes = ['B', 'KB', 'MB', 'GB']
+  const i = Math.floor(Math.log(bytes) / Math.log(k))
+  return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i]
+}
+
+function StoragePreview() {
+  const { t } = useTranslation()
+  const { user } = useAuth()
+  const used = user?.usedBytes ?? 0
+  const quota = user?.storageQuotaBytes ?? 1073741824
+  const percent = user?.usedPercent ?? 0
+
+  let barColor = 'var(--accent)'
+  let warningText: string | null = null
+  if (percent >= 95) {
+    barColor = 'var(--wrong)'
+    warningText = t('workspace.storageWarningCritical')
+  } else if (percent >= 80) {
+    barColor = 'var(--warn)'
+    warningText = t('workspace.storageWarningHigh')
+  }
+
+  return (
+    <div className="storage-overview">
+      <div className="storage-bar-track">
+        <div
+          className="storage-bar-fill"
+          style={{ width: `${Math.min(percent, 100)}%`, backgroundColor: barColor }}
+        />
+      </div>
+      <div className="storage-stats">
+        <span className="storage-used">{formatBytes(used)}</span>
+        <span className="storage-of"> {t('workspace.storageOf')} </span>
+        <span className="storage-total">{formatBytes(quota)}</span>
+        <span className="storage-percent"> ({percent}%)</span>
+      </div>
+      {warningText && (
+        <div className={`workspace-alert ${percent >= 95 ? 'workspace-alert-error' : 'workspace-alert-warning'}`}>
+          {warningText}
+        </div>
+      )}
+    </div>
+  )
+}
+
 export default function Settings() {
   const { t, i18n } = useTranslation()
   const { user, refreshUser } = useAuth()
@@ -288,6 +336,15 @@ export default function Settings() {
           </div>
         </div>
       </div>
+
+      <div className="workspace-panel">
+        <div className="workspace-panel-header">
+          <h3>{t('workspace.storage')}</h3>
+        </div>
+        <div className="workspace-panel-body workspace-settings-form">
+          <StoragePreview />
+        </div>
+      </div>
     </div>
   )
 }

frontend/src/components/StorageManager.tsx

@@ -0,0 +1,187 @@
+import { useState, useEffect, useCallback } from 'react'
+import { useTranslation } from 'react-i18next'
+import { useAuth } from '../contexts/AuthContext'
+import * as examApi from '../api/examApi'
+import * as resultApi from '../api/resultApi'
+
+function formatBytes(bytes: number): string {
+  if (bytes === 0) return '0 B'
+  const k = 1024
+  const sizes = ['B', 'KB', 'MB', 'GB']
+  const i = Math.floor(Math.log(bytes) / Math.log(k))
+  return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i]
+}
+
+export default function StorageManager() {
+  const { t } = useTranslation()
+  const { user, refreshUser } = useAuth()
+  const [exams, setExams] = useState<examApi.ExamListItem[]>([])
+  const [results, setResults] = useState<resultApi.ResultListItem[]>([])
+  const [showDetails, setShowDetails] = useState(false)
+  const [deleting, setDeleting] = useState<number | null>(null)
+
+  const loadData = useCallback(async () => {
+    try {
+      const examList = await examApi.listExams()
+      setExams(examList)
+      const resultList = await resultApi.listResults()
+      setResults(resultList.results)
+    } catch {
+      // silently ignore
+    }
+  }, [])
+
+  useEffect(() => {
+    void loadData()
+  }, [loadData])
+
+  const handleDeleteExam = useCallback(async (id: number) => {
+    if (!window.confirm(t('workspace.deleteExamConfirm'))) return
+    setDeleting(id)
+    try {
+      await examApi.deleteExam(id)
+      await loadData()
+      await refreshUser()
+    } catch {
+      // ignore
+    } finally {
+      setDeleting(null)
+    }
+  }, [loadData, refreshUser, t])
+
+  const handleDeleteResult = useCallback(async (id: number) => {
+    if (!window.confirm(t('workspace.deleteResultConfirm'))) return
+    setDeleting(id)
+    try {
+      await resultApi.deleteResult(id)
+      await loadData()
+      await refreshUser()
+    } catch {
+      // ignore
+    } finally {
+      setDeleting(null)
+    }
+  }, [loadData, refreshUser, t])
+
+  const used = user?.usedBytes ?? 0
+  const quota = user?.storageQuotaBytes ?? 1073741824
+  const percent = user?.usedPercent ?? 0
+
+  let barColor = 'var(--accent)'
+  let warningText: string | null = null
+  if (percent >= 95) {
+    barColor = 'var(--wrong)'
+    warningText = t('workspace.storageWarningCritical')
+  } else if (percent >= 80) {
+    barColor = 'var(--warn)'
+    warningText = t('workspace.storageWarningHigh')
+  }
+
+  return (
+    <div className="workspace-section fade-in">
+      <div className="workspace-section-header">
+        <div>
+          <div className="workspace-section-eyebrow">{t('workspace.myWorkspace')}</div>
+          <h2 className="workspace-section-title">{t('workspace.storage')}</h2>
+        </div>
+      </div>
+
+      <div className="workspace-panel">
+        <div className="workspace-panel-header">
+          <h3>{t('workspace.storageUsage')}</h3>
+        </div>
+        <div className="workspace-panel-body workspace-settings-form">
+          <div className="storage-overview">
+            <div className="storage-bar-track">
+              <div
+                className="storage-bar-fill"
+                style={{ width: `${Math.min(percent, 100)}%`, backgroundColor: barColor }}
+              />
+            </div>
+            <div className="storage-stats">
+              <span className="storage-used">{formatBytes(used)}</span>
+              <span className="storage-of"> {t('workspace.storageOf')} </span>
+              <span className="storage-total">{formatBytes(quota)}</span>
+              <span className="storage-percent"> ({percent}%)</span>
+            </div>
+            {warningText && (
+              <div className={`workspace-alert ${percent >= 95 ? 'workspace-alert-error' : 'workspace-alert-warning'}`}>
+                {warningText}
+              </div>
+            )}
+          </div>
+
+          <div className="storage-breakdown">
+            <div className="storage-breakdown-row">
+              <span>{t('workspace.storageExams')}</span>
+              <span>{exams.length}</span>
+            </div>
+            <div className="storage-breakdown-row">
+              <span>{t('workspace.storageResults')}</span>
+              <span>{results.length}</span>
+            </div>
+          </div>
+
+          <div className="workspace-settings-footer">
+            <button
+              className="btn btn-ghost"
+              onClick={() => setShowDetails((v) => !v)}
+            >
+              {showDetails ? t('workspace.hideDetails') : t('workspace.showDetails')}
+            </button>
+          </div>
+        </div>
+      </div>
+
+      {showDetails && (
+        <div className="workspace-panel">
+          <div className="workspace-panel-header">
+            <h3>{t('workspace.storageDetails')}</h3>
+          </div>
+          <div className="workspace-panel-body">
+            {exams.length === 0 && results.length === 0 ? (
+              <p className="text-muted">{t('workspace.noStorageItems')}</p>
+            ) : (
+              <div className="storage-detail-list">
+                {exams.map((exam) => (
+                  <div key={`exam-${exam.id}`} className="storage-detail-item">
+                    <div className="storage-detail-info">
+                      <span className="storage-detail-type">{t('workspace.exam')}</span>
+                      <span className="storage-detail-title">{exam.title}</span>
+                    </div>
+                    <div className="storage-detail-actions">
+                      <button
+                        className="btn btn-danger btn-sm"
+                        onClick={() => handleDeleteExam(exam.id)}
+                        disabled={deleting === exam.id}
+                      >
+                        {deleting === exam.id ? t('common.loading') : t('common.delete')}
+                      </button>
+                    </div>
+                  </div>
+                ))}
+                {results.map((result) => (
+                  <div key={`result-${result.id}`} className="storage-detail-item">
+                    <div className="storage-detail-info">
+                      <span className="storage-detail-type">{t('workspace.result')}</span>
+                      <span className="storage-detail-title">{result.title}</span>
+                    </div>
+                    <div className="storage-detail-actions">
+                      <button
+                        className="btn btn-danger btn-sm"
+                        onClick={() => handleDeleteResult(result.id)}
+                        disabled={deleting === result.id}
+                      >
+                        {deleting === result.id ? t('common.loading') : t('common.delete')}
+                      </button>
+                    </div>
+                  </div>
+                ))}
+              </div>
+            )}
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}

frontend/src/components/Workspace.tsx

@@ -8,12 +8,14 @@ import type { Exam } from '../types'
 import MyExams from './MyExams'
 import MyResults from './MyResults'
 import Settings from './Settings'
+import StorageManager from './StorageManager'
 
-type TabKey = 'exams' | 'results' | 'settings'
+type TabKey = 'exams' | 'results' | 'storage' | 'settings'
 
 const TAB_KEYS: { key: TabKey; labelKey: string; icon: string }[] = [
   { key: 'exams', labelKey: 'workspace.myExams', icon: '◇' },
   { key: 'results', labelKey: 'workspace.results', icon: '✦' },
+  { key: 'storage', labelKey: 'workspace.storage', icon: '◉' },
   { key: 'settings', labelKey: 'workspace.settings', icon: '⚙' },
 ]
 
@@ -83,7 +85,8 @@ export default function Workspace({ onLoadExam }: Props) {
 
       <main className="workspace-main">
         {activeTab === 'exams' && <MyExams onLoadExam={onLoadExam} />}
-        {activeTab === 'results' && <MyResults />}
+        {activeTab === 'results' && <MyResults onLoadExam={onLoadExam} />}
+        {activeTab === 'storage' && <StorageManager />}
         {activeTab === 'settings' && <Settings />}
       </main>
     </div>

frontend/src/contexts/AuthContext.tsx

@@ -9,6 +9,10 @@ export interface User {
   email: string
   displayName: string
   role: 'user' | 'admin'
+  storageQuotaBytes?: number
+  usedBytes?: number
+  usedPercent?: number
+  plan?: string
 }
 
 interface AuthContextValue {
@@ -47,7 +51,16 @@ export function AuthProvider({ children }: { children: ReactNode }) {
         return
       }
       const data = await authApi.getMe()
-      setUser({ id: data.id, email: data.email, displayName: data.displayName, role: (data.role as 'user' | 'admin') ?? 'user' })
+      setUser({
+        id: data.id,
+        email: data.email,
+        displayName: data.displayName,
+        role: (data.role as 'user' | 'admin') ?? 'user',
+        storageQuotaBytes: data.storageQuotaBytes,
+        usedBytes: data.usedBytes,
+        usedPercent: data.usedPercent,
+        plan: data.plan,
+      })
     } catch {
       clearToken()
       setUser(null)
@@ -63,7 +76,10 @@ export function AuthProvider({ children }: { children: ReactNode }) {
   const login = useCallback(async (email: string, password: string) => {
     const data = await authApi.login({ email, password })
     setToken(data.token)
-    setUser({ ...data.user, role: (data.user.role as 'user' | 'admin') ?? 'user' })
+    setUser({
+      ...data.user,
+      role: (data.user.role as 'user' | 'admin') ?? 'user',
+    })
   }, [])
 
   const register = useCallback(async (email: string, password: string, displayName: string): Promise<string> => {

frontend/src/i18n/en.json

@@ -39,6 +39,7 @@
     "clearHistory": "Clear history",
     "dateTimeFormat": "{{date}} · {{correct}}/{{graded}} correct",
     "review": "Review",
+    "retake": "Retake",
     "loadError": "Could not load: {{message}}",
     "loadSampleError": "Could not load sample: {{message}}",
     "clearHistoryConfirm": "Clear all past attempts?"
@@ -124,6 +125,8 @@
     "explanation": "Explanation",
     "rubric": "Rubric (self-grade)",
     "retakeExam": "Retake exam",
+    "redoFailed": "Redo failed questions",
+    "cantRetake": "Exam no longer saved in workspace",
     "backToHome": "Back to home"
   },
   "tweaks": {
@@ -184,7 +187,22 @@
     "textSizeDesc": "Adjust the base font size for readability",
     "defaultFeedback": "Default Feedback",
     "defaultFeedbackLabel": "Feedback mode",
-    "defaultFeedbackDesc": "Choose when to see answer feedback during exams"
+    "defaultFeedbackDesc": "Choose when to see answer feedback during exams",
+    "storage": "Storage",
+    "storageUsage": "Storage Usage",
+    "storageOf": "of",
+    "storageExams": "Saved exams",
+    "storageResults": "Results",
+    "showDetails": "Show details",
+    "hideDetails": "Hide details",
+    "storageDetails": "Storage Details",
+    "noStorageItems": "No items using storage.",
+    "exam": "Exam",
+    "result": "Result",
+    "deleteExamConfirm": "Delete this exam? This cannot be undone.",
+    "deleteResultConfirm": "Delete this result? This cannot be undone.",
+    "storageWarningHigh": "You are using over 80% of your storage.",
+    "storageWarningCritical": "You are using over 95% of your storage. Delete some items to free up space."
   },
   "admin": {
     "administration": "Administration",

frontend/src/i18n/nl.json

@@ -39,6 +39,7 @@
     "clearHistory": "Wis geschiedenis",
     "dateTimeFormat": "{{date}} · {{correct}}/{{graded}} correct",
     "review": "Nakijken",
+    "retake": "Opnieuw maken",
     "loadError": "Kon niet laden: {{message}}",
     "loadSampleError": "Kon voorbeeld niet laden: {{message}}",
     "clearHistoryConfirm": "Alle eerdere pogingen wissen?"
@@ -124,6 +125,8 @@
     "explanation": "Uitleg",
     "rubric": "Rubric (zelfbeoordeling)",
     "retakeExam": "Examen opnieuw maken",
+    "redoFailed": "Foute vragen opnieuw maken",
+    "cantRetake": "Examen niet meer opgeslagen in werkruimte",
     "backToHome": "Terug naar home"
   },
   "tweaks": {
@@ -184,7 +187,22 @@
     "textSizeDesc": "Pas de basislettergrootte aan voor leesbaarheid",
     "defaultFeedback": "Standaard Feedback",
     "defaultFeedbackLabel": "Feedbackmodus",
-    "defaultFeedbackDesc": "Kies wanneer je antwoordfeedback ziet tijdens examens"
+    "defaultFeedbackDesc": "Kies wanneer je antwoordfeedback ziet tijdens examens",
+    "storage": "Opslag",
+    "storageUsage": "Opslaggebruik",
+    "storageOf": "van",
+    "storageExams": "Opgeslagen examens",
+    "storageResults": "Resultaten",
+    "showDetails": "Toon details",
+    "hideDetails": "Verberg details",
+    "storageDetails": "Opslagdetails",
+    "noStorageItems": "Geen items die opslag gebruiken.",
+    "exam": "Examen",
+    "result": "Resultaat",
+    "deleteExamConfirm": "Dit examen verwijderen? Dit kan niet ongedaan worden gemaakt.",
+    "deleteResultConfirm": "Dit resultaat verwijderen? Dit kan niet ongedaan worden gemaakt.",
+    "storageWarningHigh": "Je gebruikt meer dan 80% van je opslag.",
+    "storageWarningCritical": "Je gebruikt meer dan 95% van je opslag. Verwijder enkele items om ruimte vrij te maken."
   },
   "admin": {
     "administration": "Beheer",

frontend/src/index.css

@@ -424,7 +424,7 @@ select {
 }
 .history-row {
     display: grid;
-    grid-template-columns: 1fr auto auto auto;
+    grid-template-columns: 1fr auto auto auto auto;
     gap: 24px;
     padding: 14px 0;
     border-bottom: 1px solid var(--line);
@@ -2664,6 +2664,12 @@ select {
     border: 1px solid var(--correct);
 }
 
+.workspace-alert-warning {
+    background: var(--warn-weak);
+    color: var(--warn);
+    border: 1px solid var(--warn);
+}
+
 .workspace-alert-close {
     background: none;
     border: none;
@@ -2921,6 +2927,113 @@ select {
    Workspace / Editor Responsive
    ============================================================ */
 
+/* ---------- Storage ---------- */
+.storage-overview {
+    margin-bottom: 16px;
+}
+.storage-bar-track {
+    height: 8px;
+    background: var(--paper-3);
+    border-radius: 999px;
+    overflow: hidden;
+    margin-bottom: 8px;
+}
+.storage-bar-fill {
+    height: 100%;
+    border-radius: 999px;
+    transition: width 300ms ease, background-color 300ms ease;
+}
+.storage-stats {
+    font-size: 13.5px;
+    color: var(--ink-2);
+    margin-bottom: 4px;
+}
+.storage-used {
+    font-weight: 600;
+    color: var(--ink);
+}
+.storage-of {
+    color: var(--ink-3);
+}
+.storage-total {
+    font-weight: 500;
+}
+.storage-percent {
+    color: var(--ink-3);
+    font-family: var(--font-mono);
+    font-size: 12px;
+}
+.storage-breakdown {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+    margin-bottom: 16px;
+}
+.storage-breakdown-row {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    font-size: 13.5px;
+    padding: 8px 12px;
+    background: var(--paper-2);
+    border-radius: var(--r-md);
+    color: var(--ink-2);
+}
+.storage-detail-list {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+.storage-detail-item {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 10px 12px;
+    border: 1px solid var(--line);
+    border-radius: var(--r-md);
+    background: var(--paper);
+}
+.storage-detail-info {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    min-width: 0;
+}
+.storage-detail-type {
+    font-family: var(--font-mono);
+    font-size: 10.5px;
+    text-transform: uppercase;
+    letter-spacing: 0.08em;
+    color: var(--ink-4);
+    background: var(--paper-2);
+    padding: 2px 8px;
+    border-radius: 4px;
+    flex-shrink: 0;
+}
+.storage-detail-title {
+    font-size: 14px;
+    color: var(--ink);
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+.storage-detail-actions {
+    flex-shrink: 0;
+}
+.btn-danger {
+    background: var(--wrong-weak);
+    color: var(--wrong);
+    border-color: var(--wrong);
+}
+.btn-danger:hover {
+    background: var(--wrong);
+    color: var(--paper);
+}
+.text-muted {
+    color: var(--ink-3);
+    font-size: 13.5px;
+}
+
 @media (max-width: 900px) {
     .workspace-shell {
         grid-template-columns: 1fr;
@@ -2992,4 +3105,15 @@ select {
         max-width: 100%;
         width: 100%;
     }
+    .storage-detail-item {
+        flex-direction: column;
+        align-items: flex-start;
+        gap: 10px;
+    }
+    .storage-detail-actions {
+        width: 100%;
+    }
+    .storage-detail-actions .btn {
+        width: 100%;
+    }
 }

frontend/src/types.ts

@@ -90,6 +90,7 @@ export interface ExamState {
   startedAt: number;
   completedAt?: number;
   feedbackMode: FeedbackMode;
+  isRedo?: boolean;
 }
 
 export interface HistoryEntry {

node_modules/.package-lock.json

@@ -1,6 +0,0 @@
-{
-  "name": "brainwave",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {}
-}

node_modules/.vite/vitest/da39a3ee5e6b4b0d3255bfef95601890afd80709/results.json

@@ -1 +1 @@
-{"version":"4.1.5","results":[[":frontend/src/utils/grading.test.ts",{"duration":7.161699999999996,"failed":false}],[":frontend/src/utils/latex.test.ts",{"duration":9.518499999999989,"failed":false}],[":backend/src/validators/authSchemas.test.ts",{"duration":7.022400000000005,"failed":false}],[":frontend/src/utils/validation.test.ts",{"duration":4.217900000000014,"failed":false}],[":frontend/src/utils/storage.test.ts",{"duration":4.687600000000003,"failed":false}],[":backend/src/validators/examSchemas.test.ts",{"duration":6.788000000000011,"failed":false}],[":backend/src/validators/adminSchemas.test.ts",{"duration":7.534500000000008,"failed":false}],[":backend/src/middleware/error.test.ts",{"duration":2.5043000000000006,"failed":false}],[":frontend/src/utils/slug.test.ts",{"duration":4.5700999999999965,"failed":false}],[":frontend/src/utils/formatting.test.ts",{"duration":4.011300000000006,"failed":false}],[":backend/src/config.test.ts",{"duration":4.423100000000005,"failed":false}],[":backend/src/validators/resultSchemas.test.ts",{"duration":5.812899999999985,"failed":false}],[":backend/src/utils/tokens.test.ts",{"duration":73.72379999999998,"failed":false}],[":backend/src/validators/setupSchemas.test.ts",{"duration":5.070899999999995,"failed":false}],[":backend/src/utils/asyncHandler.test.ts",{"duration":4.5079000000000065,"failed":false}],[":frontend/src/utils/api.test.ts",{"duration":3.4222000000000037,"failed":false}]]}
+{"version":"4.1.5","results":[[":frontend/src/utils/grading.test.ts",{"duration":7.442099999999982,"failed":false}],[":backend/dist/validators/resultSchemas.test.js",{"duration":5.80680000000001,"failed":false}],[":backend/src/validators/authSchemas.test.ts",{"duration":12.700600000000009,"failed":false}],[":backend/src/validators/resultSchemas.test.ts",{"duration":6.035500000000013,"failed":false}],[":backend/dist/validators/authSchemas.test.js",{"duration":5.9454000000000065,"failed":false}],[":frontend/src/utils/storage.test.ts",{"duration":6.9056999999999675,"failed":false}],[":backend/dist/validators/examSchemas.test.js",{"duration":7.014700000000005,"failed":false}],[":backend/dist/config.test.js",{"duration":4.3396999999999935,"failed":false}],[":backend/src/validators/adminSchemas.test.ts",{"duration":7.116100000000017,"failed":false}],[":frontend/src/utils/latex.test.ts",{"duration":11.073699999999974,"failed":false}],[":backend/dist/validators/adminSchemas.test.js",{"duration":6.721499999999992,"failed":false}],[":backend/src/config.test.ts",{"duration":4.0815000000000055,"failed":false}],[":backend/src/validators/examSchemas.test.ts",{"duration":6.222700000000032,"failed":false}],[":backend/dist/utils/tokens.test.js",{"duration":166.78979999999999,"failed":false}],[":frontend/src/utils/validation.test.ts",{"duration":4.239000000000004,"failed":false}],[":backend/src/utils/tokens.test.ts",{"duration":118.4222,"failed":false}],[":frontend/src/utils/slug.test.ts",{"duration":4.551799999999986,"failed":false}],[":backend/src/utils/asyncHandler.test.ts",{"duration":5.303799999999995,"failed":false}],[":backend/src/validators/setupSchemas.test.ts",{"duration":5.920199999999994,"failed":false}],[":backend/dist/validators/setupSchemas.test.js",{"duration":6.263800000000003,"failed":false}],[":backend/dist/middleware/error.test.js",{"duration":2.775499999999994,"failed":false}],[":backend/dist/utils/asyncHandler.test.js",{"duration":5.524900000000002,"failed":false}],[":frontend/src/utils/formatting.test.ts",{"duration":4.508899999999983,"failed":false}],[":backend/src/middleware/error.test.ts",{"duration":3.431699999999978,"failed":false}],[":frontend/src/utils/api.test.ts",{"duration":2.2516999999999996,"failed":false}],[":backend/src/repositories/storageRepo.test.ts",{"duration":10.521900000000016,"failed":false}]]}

package-lock.json

@@ -1,6 +1,29 @@
 {
   "name": "brainwave",
+  "version": "0.0.1",
   "lockfileVersion": 3,
   "requires": true,
-  "packages": {}
+  "packages": {
+    "": {
+      "name": "brainwave",
+      "version": "0.0.1",
+      "devDependencies": {
+        "typescript": "^6.0.3"
+      }
+    },
+    "node_modules/typescript": {
+      "version": "6.0.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-6.0.3.tgz",
+      "integrity": "sha512-y2TvuxSZPDyQakkFRPZHKFm+KKVqIisdg9/CZwm9ftvKXLP8NRWj38/ODjNbr43SsoXqNuAisEf1GdCxqWcdBw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    }
+  }
 }

package.json

@@ -0,0 +1,8 @@
+{
+  "name": "brainwave",
+  "private": true,
+  "version": "0.0.1",
+  "devDependencies": {
+    "typescript": "^6.0.3"
+  }
+}