perf(quiz,points): optimize queries, fix points logic, add quiz seeding #104
Conversation
• Quiz performance: - Eliminate N+1 queries in getQuizQuestions by batch-loading answers - Optimize submitQuizAttempt with inArray-based batch verification - Reduce quiz page load from 21 queries to 2 - Add seed to randomizeQuizQuestions for stable randomization - Handle empty answers array and validate answer–question matching • Points system refactor (ledger-only): - Migrate to ledger-based points model (point_transactions as source of truth) - Remove users.points column and db.transaction() usage (neon-http compatible) - Store full attempt score in quiz_attempts.pointsEarned - Award only delta vs previous best attempt - Compute total points via SUM(point_transactions.points) - Optimize previous best lookup using MAX(pointsEarned) • Quiz content & seeding: - Add seed scripts for HTML, CSS, Git, JavaScript, TypeScript quizzes - Introduce advanced and fundamentals quiz trackse • UI & logic fixes: - Add pointsAwarded prop to QuizResult - Show "+N points added" or "no points (result not improved)" - Fix Dashboard to rely on ledger total • Leaderboard & DB performance: - Update leaderboard queries to LEFT JOIN + GROUP BY + SUM - Add index for point_transactions (user_id) - Apply drizzle migrations and snapshots Benefits: - Faster quiz loads and lower DB pressure - Neon-compatible (no transactions)
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📝 WalkthroughWalkthroughAdded transactional points via pointTransactions and moved user points out of Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant Action as submitQuizAttempt (Action)
participant DB as Database
participant Points as PointsCalc
Client->>Action: Submit quiz (quizId, userId, answers, timeSpent)
rect rgb(220,235,255)
Note over Action: Auth & session
Action->>Action: getCurrentUser()
Action->>Action: validate userId match
end
rect rgb(220,255,235)
Note over Action: Validation & batch loads
Action->>DB: Fetch quizQuestions(quizId)
DB-->>Action: questions[]
Action->>DB: Fetch quizAnswers(selectedAnswerIds)
DB-->>Action: answers[]
Action->>Action: validate counts, duplicates, pairings, time
end
rect rgb(255,235,220)
Note over Action: Scoring
Action->>Points: calculateQuizPoints(totalQuestions, correctCount)
Points-->>Action: pointsEarned
end
rect rgb(235,255,235)
Note over Action: Persistence
Action->>DB: Insert quizAttempts (pointsEarned, metadata...)
Action->>DB: Insert quizAttemptAnswers (per-question)
DB-->>Action: OK
end
Action-->>Client: Result (score, pointsEarned, totalQuestions)
Estimated code review effort🎯 4 (Complex) | ⏱️ ~45 minutes Possibly related PRs
Suggested reviewers
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✨ Finishing touches
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Actionable comments posted: 17
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⚠️ Outside diff range comments (1)
frontend/components/quiz/QuizResult.tsx (1)
143-157: Both buttons navigate to signup, but one is labeled "Login".The "Увійти" (Login) button at line 150 navigates to
/signup. This appears to be a bug - it should likely navigate to/logininstead. Additionally, remove the console.log at line 145.🔎 Proposed fix
<Button - onClick={() => { - const url = `/${locale}/signup?returnTo=/quiz/${quizSlug}`; - console.log('Navigating to signup:', url); - window.location.href = url; -}} + onClick={() => { + window.location.href = `/${locale}/login?returnTo=/quiz/${quizSlug}`; + }} variant="primary" > Увійти </Button>
🧹 Nitpick comments (15)
frontend/components/quiz/CountdownTimer.tsx (1)
38-51: Consider triggeringonTimeUpdirectly when tab becomes visible and time has expired.If time expires while the tab is hidden, the visibility handler updates the UI to show 0 but relies on the next interval tick (up to 100ms later) to call
onTimeUp. For faster response, callonTimeUpdirectly when remaining is 0:Proposed improvement
const handleVisibilityChange = () => { if (!document.hidden) { const remaining = Math.max(0, Math.floor((endTime - Date.now()) / 1000)); setRemainingSeconds(remaining); + if (remaining === 0) { + queueMicrotask(onTimeUp); + } } };Note: You'd need to add
onTimeUpto the effect's dependency array for this change.frontend/app/api/auth/signup/route.ts (1)
20-20: Remove debug console.log or use proper logging.The console.log statement appears to be debug code. Either remove it or replace it with a structured logging solution for production observability.
frontend/db/seed-quiz-html.ts (2)
64-68: Minor:asynckeyword unnecessary for synchronous file read.
loadQuestionsis markedasyncbut uses synchronousreadFileSync. While harmless, consider either removingasyncor usingfs/promises.readFilefor consistency.🔎 Option: Use async file read
+import { readFile } from 'fs/promises'; -import { readFileSync } from 'fs'; async function loadQuestions(partNumber: number): Promise<QuestionData[]> { const partPath = join(process.cwd(), 'parse', 'html', 'fundamentals', `html-quiz-part${partNumber}.json`); - const partData: QuizPartData = JSON.parse(readFileSync(partPath, 'utf-8')); + const partData: QuizPartData = JSON.parse(await readFile(partPath, 'utf-8')); return partData.questions; }
141-180: Consider batching inserts for better seed performance (optional).The current implementation performs individual inserts per question, locale, and answer. For a seed script this is acceptable, but if seeding becomes slow with larger datasets, Drizzle supports batch inserts via arrays in
.values().frontend/db/seed-quiz-html-advanced.ts (1)
1-240: Consider extracting shared seeding logic to reduce duplication (optional).This file shares ~95% of its code with
seed-quiz-html.tsandseed-quiz-css.ts. A factory function accepting quiz metadata and paths could consolidate this:// Potential shared utility function createQuizSeeder(config: QuizSeedConfig) { return { ensureQuizExists, seedQuestions, seedQuizFromJson }; }This is optional and can be deferred—seed scripts with some duplication are common and maintainable.
frontend/db/schema/quiz.ts (1)
142-142: LGTM! Consider adding an index for points-based queries (optional).The
pointsEarnedcolumn correctly supports the ledger-based points model. If queries likeMAX(pointsEarned) WHERE userId = ? AND quizId = ?become frequent, a composite index could improve performance:userQuizPointsIdx: index('quiz_attempts_user_quiz_points_idx').on( table.userId, table.quizId, table.pointsEarned ),This is optional—monitor query performance first.
frontend/db/queries/leaderboard.ts (1)
37-37: Minor: Redundant fallback in points conversion.The
|| 0fallback is redundant sinceCOALESCE(SUM(...), 0)at line 16 already guarantees a non-null number. The SQL expression will never return NULL.🔎 Proposed simplification
- points: Number(u.points) || 0, + points: Number(u.points),frontend/db/queries/quiz.ts (1)
187-226: Clean batch loading implementation.The in-memory grouping is efficient. One minor observation: the Map type
Map<string, typeof allAnswers>works but could be more precise asMap<string, (typeof allAnswers)[number][]>to explicitly indicate it holds arrays of individual answer elements rather than the full query result type.This is purely a readability nit — the current implementation is correct.
frontend/db/seed-quiz-javascript-advanced.ts (2)
64-68: Function marked async but uses synchronous I/O.
loadQuestionsis declaredasyncbut only uses synchronousreadFileSync. Consider either removingasyncor switching tofs/promises.readFilefor consistency.🔎 Proposed fix
-async function loadQuestions(partNumber: number): Promise<QuestionData[]> { - const partPath = join(process.cwd(), 'parse', 'js', 'advanced', `javascript-advanced-quiz-part${partNumber}.json`); - const partData: QuizPartData = JSON.parse(readFileSync(partPath, 'utf-8')); +function loadQuestions(partNumber: number): QuestionData[] { + const partPath = join(process.cwd(), 'parse', 'js', 'advanced', `javascript-advanced-quiz-part${partNumber}.json`); + const partData: QuizPartData = JSON.parse(readFileSync(partPath, 'utf-8')); return partData.questions; }
212-212: Answer count assumption may be incorrect.The summary assumes exactly 4 answers per question (
totalQuestions * 4). If questions have varying answer counts, this will be inaccurate. Consider tracking actual answer counts.frontend/db/seed-quiz-css-advanced.ts (1)
1-240: High code duplication across quiz seed scripts.This script is nearly identical to
seed-quiz-javascript-advanced.tsand other seed scripts. The only differences are theCATEGORY_SLUG,QUIZ_METADATA, JSON paths, anddisplayOrdervalues. Consider extracting a shared seed utility to reduce maintenance burden.🔎 Example approach
// db/utils/seed-quiz.ts export interface QuizSeedConfig { categorySlug: string; slug: string; questionsCount: number; timeLimitSeconds: number; displayOrder: number; translations: Record<Locale, { title: string; description: string }>; jsonPath: (part: number) => string; } export async function seedQuiz(config: QuizSeedConfig, partArg: string) { // Shared implementation }Then each seed script becomes minimal:
// seed-quiz-css-advanced.ts import { seedQuiz } from './utils/seed-quiz'; seedQuiz({ categorySlug: 'css', slug: 'css-advanced', // ...config }, process.argv[2]);frontend/actions/quiz.ts (1)
12-12: Unused import.The
andimport from drizzle-orm is not used in the active code.🔎 Proposed fix
-import { eq, inArray, and } from 'drizzle-orm'; +import { eq, inArray } from 'drizzle-orm';frontend/db/seed-quiz-git.ts (2)
64-68: Unnecessaryasyncand missing error handling.The function is marked
asyncbut performs only synchronous operations. Additionally, if the file doesn't exist or contains invalid JSON, the error will be cryptic.🔎 Suggested improvement
-async function loadQuestions(partNumber: number): Promise<QuestionData[]> { - const partPath = join(process.cwd(), 'parse', 'git', `git-quiz-part${partNumber}.json`); - const partData: QuizPartData = JSON.parse(readFileSync(partPath, 'utf-8')); - return partData.questions; +function loadQuestions(partNumber: number): QuestionData[] { + const partPath = join(process.cwd(), 'parse', 'git', `git-quiz-part${partNumber}.json`); + try { + const partData: QuizPartData = JSON.parse(readFileSync(partPath, 'utf-8')); + return partData.questions; + } catch (error) { + throw new Error(`Failed to load questions from ${partPath}: ${error instanceof Error ? error.message : error}`); + } }
207-225: Hardcoded answer count assumption in log output.Lines 210 and 225 assume each question has exactly 4 answers (
* 4). If questions have variable answer counts, the logged totals will be inaccurate. Consider computing the actual count.🔎 Suggested fix for accurate logging
For the "all" branch, accumulate actual answer counts:
let totalQuestions = 0; + let totalAnswers = 0; for (let i = 1; i <= 4; i++) { const questions = await loadQuestions(i); await seedQuestions(questions, quizId, i); totalQuestions += questions.length; + totalAnswers += questions.reduce((sum, q) => sum + q.answers.length, 0); } console.log('\nAll parts seeded successfully!'); console.log(` - 1 quiz with ${LOCALES.length} translations`); console.log(` - ${totalQuestions} questions total`); - console.log(` - ${totalQuestions * 4} answers with ${LOCALES.length} translations each`); + console.log(` - ${totalAnswers} answers with ${LOCALES.length} translations each`);Similarly for the single-part branch at line 225.
frontend/app/api/quiz/guest-result/route.ts (1)
231-279: Consider broader error handling coverage.The try-catch only wraps the persistence operations (lines 231-262), but earlier DB queries at lines 129-132 and 178-185 could also throw. If they fail, the error propagates without the "Failed to save guest quiz result" message.
🔎 Suggested improvement
Move the try-catch to wrap all DB operations:
+ try { const questionRows = await db .select({ id: quizQuestions.id }) .from(quizQuestions) .where(eq(quizQuestions.quizId, quizId)); // ... rest of validation and persistence ... - try { const [attempt] = await db .insert(quizAttempts) // ... + } catch (error) { + console.error("Failed to process guest quiz result:", error); + return NextResponse.json( + { success: false, error: "Failed to process result" }, + { status: 500 } + ); + }
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📒 Files selected for processing (47)
frontend/actions/quiz.tsfrontend/app/[locale]/dashboard/page.tsxfrontend/app/[locale]/leaderboard/page.tsxfrontend/app/[locale]/quiz/[slug]/page.tsxfrontend/app/api/auth/signup/route.tsfrontend/app/api/quiz/guest-result/route.tsfrontend/components/quiz/CountdownTimer.tsxfrontend/components/quiz/QuizContainer.tsxfrontend/components/quiz/QuizResult.tsxfrontend/components/quiz/QuizzesSection.tsxfrontend/db/queries/leaderboard.tsfrontend/db/queries/points.tsfrontend/db/queries/quiz.tsfrontend/db/queries/users.tsfrontend/db/schema/points.tsfrontend/db/schema/quiz.tsfrontend/db/schema/users.tsfrontend/db/seed-demo-leaderboard.tsfrontend/db/seed-quiz-css-advanced.tsfrontend/db/seed-quiz-css.tsfrontend/db/seed-quiz-git.tsfrontend/db/seed-quiz-html-advanced.tsfrontend/db/seed-quiz-html.tsfrontend/db/seed-quiz-javascript-advanced.tsfrontend/db/seed-quiz-typescript-advanced.tsfrontend/db/seed-quiz-typescript.tsfrontend/drizzle/0009_unknown_nico_minoru.sqlfrontend/drizzle/0010_parallel_princess_powerful.sqlfrontend/drizzle/meta/0009_snapshot.jsonfrontend/drizzle/meta/0010_snapshot.jsonfrontend/drizzle/meta/_journal.jsonfrontend/next.config.tsfrontend/parse/javascript-quiz-part1.jsonfrontend/parse/javascript-quiz-part2.jsonfrontend/parse/javascript-quiz-part3.jsonfrontend/parse/javascript-quiz-part4.jsonfrontend/parse/react-quiz-data-part1.jsonfrontend/parse/react-quiz-data-part2.jsonfrontend/parse/typescript/advanced/typescript-advanced-quiz-part1.jsonfrontend/parse/typescript/advanced/typescript-advanced-quiz-part2.jsonfrontend/parse/typescript/advanced/typescript-advanced-quiz-part3.jsonfrontend/parse/typescript/advanced/typescript-advanced-quiz-part4.jsonfrontend/parse/typescript/fundamentals/typescript-quiz-part1.jsonfrontend/parse/typescript/fundamentals/typescript-quiz-part2.jsonfrontend/parse/typescript/fundamentals/typescript-quiz-part3.jsonfrontend/parse/typescript/fundamentals/typescript-quiz-part4.jsonfrontend/proxy.ts
💤 Files with no reviewable changes (7)
- frontend/parse/javascript-quiz-part2.json
- frontend/parse/react-quiz-data-part2.json
- frontend/parse/javascript-quiz-part4.json
- frontend/parse/javascript-quiz-part3.json
- frontend/db/schema/users.ts
- frontend/parse/javascript-quiz-part1.json
- frontend/parse/react-quiz-data-part1.json
🧰 Additional context used
🧠 Learnings (1)
📚 Learning: 2025-12-30T16:01:02.523Z
Learnt from: kryvosheyin
Repo: DevLoversTeam/devlovers.net PR: 88
File: frontend/drizzle/schema.ts:153-153
Timestamp: 2025-12-30T16:01:02.523Z
Learning: The file frontend/drizzle/schema.ts is a legacy file not used by Drizzle or the runtime. The canonical schemas live in frontend/db/schema/* as configured in drizzle-config.ts, and that's what migrations and runtime use.
Applied to files:
frontend/drizzle/meta/0010_snapshot.jsonfrontend/drizzle/meta/0009_snapshot.jsonfrontend/db/schema/points.tsfrontend/db/seed-quiz-typescript-advanced.tsfrontend/db/seed-quiz-typescript.tsfrontend/db/seed-quiz-html-advanced.tsfrontend/db/seed-demo-leaderboard.ts
🧬 Code graph analysis (17)
frontend/app/[locale]/leaderboard/page.tsx (1)
frontend/app/api/questions/[category]/route.ts (1)
revalidate(6-6)
frontend/db/queries/leaderboard.ts (2)
frontend/db/schema/points.ts (1)
pointTransactions(13-27)frontend/db/schema/users.ts (1)
users(11-42)
frontend/db/seed-quiz-typescript-advanced.ts (2)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (7)
quizzes(19-42)quizAttempts(129-164)quizQuestions(59-79)quizTranslations(44-57)quizQuestionContent(81-94)quizAnswers(96-111)quizAnswerTranslations(113-127)
frontend/db/queries/quiz.ts (2)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (2)
quizAnswers(96-111)quizAnswerTranslations(113-127)
frontend/db/seed-quiz-css-advanced.ts (2)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (7)
quizzes(19-42)quizAttempts(129-164)quizQuestions(59-79)quizTranslations(44-57)quizQuestionContent(81-94)quizAnswers(96-111)quizAnswerTranslations(113-127)
frontend/db/seed-quiz-typescript.ts (2)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (7)
quizzes(19-42)quizAttempts(129-164)quizQuestions(59-79)quizTranslations(44-57)quizQuestionContent(81-94)quizAnswers(96-111)quizAnswerTranslations(113-127)
frontend/db/seed-quiz-git.ts (2)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (7)
quizzes(19-42)quizAttempts(129-164)quizQuestions(59-79)quizTranslations(44-57)quizQuestionContent(81-94)quizAnswers(96-111)quizAnswerTranslations(113-127)
frontend/db/seed-quiz-html.ts (2)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (7)
quizzes(19-42)quizAttempts(129-164)quizQuestions(59-79)quizTranslations(44-57)quizQuestionContent(81-94)quizAnswers(96-111)quizAnswerTranslations(113-127)
frontend/db/queries/points.ts (3)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (1)
quizAttempts(129-164)frontend/db/schema/points.ts (1)
pointTransactions(13-27)
frontend/db/queries/users.ts (3)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/points.ts (1)
pointTransactions(13-27)frontend/drizzle/schema.ts (1)
pointTransactions(128-142)
frontend/db/seed-quiz-css.ts (2)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (7)
quizzes(19-42)quizAttempts(129-164)quizQuestions(59-79)quizTranslations(44-57)quizQuestionContent(81-94)quizAnswers(96-111)quizAnswerTranslations(113-127)
frontend/db/seed-quiz-javascript-advanced.ts (2)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (7)
quizzes(19-42)quizAttempts(129-164)quizQuestions(59-79)quizTranslations(44-57)quizQuestionContent(81-94)quizAnswers(96-111)quizAnswerTranslations(113-127)
frontend/app/api/quiz/guest-result/route.ts (4)
frontend/lib/auth.ts (1)
getCurrentUser(94-115)frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (4)
quizQuestions(59-79)quizAnswers(96-111)quizAttempts(129-164)quizAttemptAnswers(166-192)frontend/db/queries/points.ts (1)
calculateQuizPoints(7-12)
frontend/app/[locale]/quiz/[slug]/page.tsx (1)
frontend/db/queries/quiz.ts (1)
getQuizQuestionsRandomized(252-259)
frontend/db/seed-quiz-html-advanced.ts (2)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (7)
quizzes(19-42)quizAttempts(129-164)quizQuestions(59-79)quizTranslations(44-57)quizQuestionContent(81-94)quizAnswers(96-111)quizAnswerTranslations(113-127)
frontend/actions/quiz.ts (4)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (4)
quizQuestions(59-79)quizAnswers(96-111)quizAttempts(129-164)quizAttemptAnswers(166-192)frontend/lib/auth.ts (1)
getCurrentUser(94-115)frontend/db/queries/points.ts (2)
calculateQuizPoints(7-12)awardQuizPoints(38-74)
frontend/proxy.ts (1)
frontend/lib/auth.ts (1)
AuthTokenPayload(23-27)
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🔇 Additional comments (46)
frontend/components/quiz/CountdownTimer.tsx (1)
23-33: Good improvement: Date.now()-based calculation with 100ms polling.Using a fixed
endTimewith high-frequency polling is more accurate than decrementing state per second, especially when browsers throttle background tab timers. ThequeueMicrotaskforonTimeUpcorrectly defers the callback to avoid state updates during render.frontend/proxy.ts (1)
43-52: Token validation logic is correct, pending signature verification fix.The token validation and expiration check logic is properly implemented. However, this function's security depends on fixing the signature verification issue in
decodeAuthToken(see comment on lines 19-41).frontend/app/api/auth/signup/route.ts (1)
21-80: Error handling implementation looks good.The try/catch wrapper with error logging and detailed error responses provides good observability and debugging support. The 500 status code is appropriate for server errors.
frontend/parse/typescript/advanced/typescript-advanced-quiz-part3.json (1)
1-434: Well-structured quiz data with comprehensive multilingual support.The JSON structure is consistent and complete with proper question metadata, multilingual prompts/explanations, and correctly flagged answers. The content covers advanced TypeScript topics appropriately for the difficulty level.
frontend/parse/typescript/fundamentals/typescript-quiz-part3.json (1)
1-434: Well-structured fundamentals quiz data with appropriate difficulty levels.The JSON structure is consistent and complete with proper multilingual support. The questions cover essential TypeScript fundamentals (utility types, conditional types, decorators, modules, configuration) at beginner and medium difficulty levels.
frontend/parse/typescript/fundamentals/typescript-quiz-part4.json (1)
1-434: LGTM!The quiz data structure is well-formed with consistent localization across uk/en/pl, proper difficulty assignments, and technically accurate TypeScript questions covering type narrowing, declaration files, configuration, OOP concepts, and utility types.
frontend/parse/typescript/advanced/typescript-advanced-quiz-part1.json (1)
1-434: LGTM!Well-structured advanced TypeScript quiz covering decorators, reflection, type guards, and utility types. Localization is complete and technically accurate.
frontend/app/[locale]/leaderboard/page.tsx (1)
4-4: LGTM!Increasing ISR revalidation from 300s to 3600s aligns with the query-level caching in
getLeaderboardData. This is appropriate for leaderboard data that doesn't require real-time updates.frontend/drizzle/meta/_journal.json (1)
68-81: LGTM!The migration journal entries are correctly formatted and document the two new SQL migrations introduced in this PR.
frontend/app/[locale]/quiz/[slug]/page.tsx (1)
23-24: Verify: IsDate.now()seed providing the intended "stable randomization"?The PR objective mentions "Add seed to randomizeQuizQuestions for stable randomization," but using
Date.now()as the seed generates a different value on every page load (changing every millisecond). This results in a different question order each time the page is accessed, which is the opposite of stable/deterministic randomization.If the goal is to have consistent question order for a given user or session:
- Consider using a hash of
userId + quizId, or- Store the seed in session storage, or
- Use a fixed seed per quiz instance
If the current behavior (different order every time) is intentional, the PR objective wording may need clarification.
Could you confirm whether you want:
- Different question order on each page load (current implementation), or
- Consistent question order per user/session (requires stable seed source)?
frontend/parse/typescript/advanced/typescript-advanced-quiz-part2.json (1)
1-434: LGTM!The quiz data is well-structured with:
- Accurate TypeScript technical content covering advanced topics (ReturnType, Parameters, infer, template literals, tsconfig options)
- Consistent schema across all 10 questions
- Complete translations for uk/en/pl locales
- Exactly one correct answer per question
The content accurately represents TypeScript advanced concepts and compiler configuration.
frontend/drizzle/0010_parallel_princess_powerful.sql (3)
3-3: LGTM!Adding
points_earnedcolumn with default value 0 correctly implements the ledger-based points model described in the PR objectives.
4-4: LGTM!Adding an index on
point_transactions.user_idis essential for efficiently aggregating user points viaSUM(point_transactions.points)in the new ledger-based model.
5-5: Verify: Application code updated to handle droppedusers.pointscolumn.This migration correctly implements the ledger-based points model by removing the denormalized
pointscolumn. However, the dashboard code still referencesuser.points(seefrontend/app/[locale]/dashboard/page.tsxline 45), which will cause a runtime error after this migration runs.Ensure that:
getUserProfilequery is updated to compute points frompoint_transactions- All components consuming user points are updated
- The dashboard displays points from the aggregated ledger value
Related to the critical issue flagged in
frontend/app/[locale]/dashboard/page.tsx.frontend/parse/typescript/fundamentals/typescript-quiz-part2.json (1)
1-434: LGTM! Well-structured TypeScript fundamentals quiz data.The quiz questions (ts-q11 to ts-q20) are technically accurate, cover appropriate TypeScript concepts (access modifiers, abstract classes, type operators, generics, tuples), and include complete translations for all three locales (uk, en, pl). The JSON structure is valid and consistent with the existing quiz data format.
frontend/db/queries/leaderboard.ts (2)
16-21: LGTM! Proper ledger-based aggregation with LEFT JOIN.The query correctly:
- Uses LEFT JOIN to include users with no point transactions
- Applies COALESCE to default NULL sums to 0
- Groups by all user fields to satisfy SQL requirements
- Orders by the computed total
The migration from a denormalized
users.pointscolumn to aggregatingpointTransactionsis implemented correctly.
44-44: Cache revalidation window increased significantly.The revalidate time has been increased from 300 seconds (5 minutes) to 3600 seconds (1 hour), a 12× increase. This reduces database load but means leaderboard updates will be delayed by up to an hour.
Verify this aligns with product requirements for leaderboard freshness, especially after quiz completions.
frontend/db/schema/points.ts (1)
9-9: LGTM! Essential index for leaderboard performance.Adding
point_transactions_user_id_idxonuserIdis critical for efficient queries that:
- Join
pointTransactionswithusers(as in the leaderboard query)- Filter by
userIdwhen calculating user totals- Aggregate points per user
This index will significantly improve query performance as the point transactions table grows.
Also applies to: 25-27
frontend/db/seed-demo-leaderboard.ts (2)
57-77: Verify cache invalidation after seeding.The seed flow correctly:
- Inserts demo users with
onConflictDoNothingto avoid overwriting existing users- Deletes previous seed point transactions (filtered by
source='seed'and demo user IDs)- Inserts fresh seed point transactions with proper metadata
However, since the leaderboard query uses
unstable_cachewith the'leaderboard'tag, consider adding cache invalidation after seeding to ensure the leaderboard reflects the new seed data immediately.💡 Suggested cache invalidation
After line 77, add:
import { revalidateTag } from 'next/cache'; // After inserting point transactions await db.insert(pointTransactions).values( demoUsers.map(u => ({ userId: u.id, points: u.points, source: 'seed', metadata: { reason: 'demo' }, })) ); // Invalidate leaderboard cache revalidateTag('leaderboard');Note:
revalidateTagis typically used in server actions/route handlers, not seed scripts. For seed scripts, the cache will naturally expire, or you may need to restart the dev server.
45-77: LGTM! Clean seed flow with proper transaction ledger.The updated seeding logic correctly migrates from direct user points to the transaction-based ledger model:
- Uses
onConflictDoNothingto safely handle re-runs- Cleans up previous seed transactions by filtering on
source='seed'- Creates new point transactions with proper source tracking and metadata
The demo user
pointsfield (lines 15, 22, 29, 35, 41) is appropriately used only for seeding the ledger at line 73.frontend/drizzle/meta/0010_snapshot.json (1)
1-1954: LGTM — Auto-generated migration snapshot.This Drizzle snapshot correctly reflects the schema changes:
points_earnedcolumn added toquiz_attempts(lines 546-552)point_transactions_user_id_idxindex present (lines 1145-1159)users.pointscolumn removed as expectedThe foreign key constraints and cascade behaviors are properly configured.
frontend/db/queries/quiz.ts (1)
164-186: Excellent optimization — eliminates N+1 queries.The two-query approach with batch loading is a significant improvement. Early return on empty questions prevents unnecessary work.
frontend/db/queries/points.ts (2)
28-35: Good optimization using MAX aggregate.Using a single aggregate query instead of fetching all attempts and computing max in JavaScript is more efficient.
55-73: No issue —revalidateTagcorrectly accepts the second argument.
revalidateTagin newer versions of Next.js accepts a second parameter for the cache-life profile. The callrevalidateTag('leaderboard', 'default')is valid—'default'is a built-in named profile (stale: 5 minutes, revalidate: 15 minutes, expire: 1 year). No changes needed.Likely an incorrect or invalid review comment.
frontend/db/queries/users.ts (1)
27-39: Clean implementation of ledger-based points calculation.Good approach: fetch user first, then aggregate points from the ledger. The early return for missing user prevents unnecessary work.
Minor observation:
sql<number>already types the result, soNumber(pointsResult[0]?.total) || 0is slightly redundant with the COALESCE, but provides defense-in-depth against edge cases.frontend/parse/typescript/fundamentals/typescript-quiz-part1.json (1)
1-434: Well-structured quiz content.The quiz data is well-organized with:
- Consistent structure across all 10 questions
- Complete trilingual support (uk, en, pl)
- Exactly one correct answer per question
- Accurate TypeScript fundamentals content
frontend/parse/typescript/advanced/typescript-advanced-quiz-part4.json (1)
1-434: Advanced TypeScript quiz content looks good.The quiz questions cover advanced TypeScript topics appropriately. Structure is consistent with other quiz files.
Note: Some questions (e.g., q33, q34, q35) are marked as "medium" difficulty within the "advanced" quiz. This may be intentional for difficulty progression, but verify this aligns with how difficulty is used elsewhere in the quiz system.
frontend/components/quiz/QuizContainer.tsx (3)
22-40: Clean state extension for points tracking.The
pointsAwardedstate field and optionalCOMPLETE_QUIZpayload are well-designed. The nullable type correctly represents the three states: not yet completed (null), completed with points (number), or completed with error/guest (null via fallback).
189-210: Good handling of points in submission flow.The differentiation between success (dispatches with
pointsAwarded: 0or actual value) and error (dispatches without payload, resulting innull) allows QuizResult to distinguish these cases for appropriate UI feedback.
291-309: Props correctly passed to QuizResult.The
answeredCountandpointsAwardedprops enable the result component to display appropriate feedback about points earned vs. no improvement.frontend/drizzle/0009_unknown_nico_minoru.sql (1)
1-18: Indexes and constraints look well-designed for query optimization and data integrity.The new indexes appropriately target common query patterns (quiz attempts by user/quiz, questions by category/sort order, etc.). The CHECK constraints enforce important business invariants like price consistency between minor and major currency units.
One consideration: Line 16 hardcodes
currency = 'USD'. If multi-currency support is planned in the future, this constraint will need migration.frontend/db/seed-quiz-typescript-advanced.ts (1)
1-238: Same structural patterns and duplication as other seed scripts.This script follows the same pattern as the other quiz seed scripts. The refactoring suggestion from the CSS advanced review applies here as well.
frontend/db/seed-quiz-typescript.ts (1)
1-240: Follows the established seed script pattern.This script is consistent with the other seed scripts in the PR. The same refactoring opportunity exists to extract shared logic.
frontend/actions/quiz.ts (4)
193-202: Authentication and authorization checks are well-implemented.The session validation and user ID mismatch check properly protect against unauthorized access and prevent users from submitting attempts on behalf of others.
204-209: Empty answers array rejected; verify this aligns with intended behavior.The PR summary mentions "handle empty answers arrays" but this code returns an error when
answers.length === 0. If the intent is to allow submitting with zero answers (e.g., time expired), this check should be adjusted.
211-267: Robust validation of questions and answers.The batch retrieval of question IDs and answer records eliminates N+1 queries. The validation logic properly:
- Verifies questions belong to the quiz
- Detects duplicate answers
- Ensures answers match their questions
This addresses security concerns around answer manipulation.
298-338: Points calculation and awarding logic is correct.The dual-step approach is intentional:
calculateQuizPointscomputes the full score forpointsEarnedstorage in the attempt recordawardQuizPointscalculates delta versus previous best and creates a ledger transactionThis supports the ledger-based points model described in the PR objectives.
frontend/db/seed-quiz-git.ts (4)
1-37: LGTM!The imports and type definitions are well-structured and appropriate for the seed script.
38-62: LGTM!The quiz metadata and explanation helper are well-defined with proper multi-locale support.
70-137: LGTM!The
ensureQuizExistsfunction has proper safeguards against data loss when quiz attempts exist, and handles both create and update scenarios correctly.
139-178: LGTM!The question seeding logic correctly handles questions, localized content, answers, and answer translations. While individual inserts could be batched for performance, this is acceptable for an infrequently-run seed script.
frontend/app/api/quiz/guest-result/route.ts (5)
102-127: LGTM!The input validation and authentication check are properly implemented, preventing invalid payloads and unauthorized access.
129-146: LGTM!The quiz existence check and answer count validation ensure data integrity.
148-176: LGTM!The answer validation loop efficiently detects invalid question IDs, missing fields, and duplicate answers using Set-based lookups.
178-219: LGTM!The batch answer lookup and cross-validation between selected answers and their associated questions is well-implemented, ensuring data integrity before persistence.
221-262: LGTM!The points logic correctly distinguishes between:
pointsEarned: the full score stored on this attemptpointsAwarded: the delta awarded vs previous best (viaawardQuizPoints)This aligns with the PR objectives for the ledger-based points system.
| email: user.email ?? '', | ||
| role: user.role ?? null, | ||
| points: realPoints, | ||
| points: user.points ?? 0, |
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Critical: Referencing dropped column user.points.
Migration 0010_parallel_princess_powerful.sql drops the points column from the users table (line 5), but this code still references user.points. This will cause a runtime error once the migration is applied.
According to the PR objectives, points should now be computed from SUM(point_transactions.points). The getUserProfile query needs to be updated to aggregate points from the point_transactions table using a JOIN and SUM, or points should be fetched separately and passed to this component.
🔎 Verify the issue
Run the following script to check how getUserProfile currently fetches user data:
#!/bin/bash
# Description: Check getUserProfile implementation to see if it computes points from transactions
# Search for getUserProfile function definition
ast-grep --pattern $'export async function getUserProfile($$$) {
$$$
}'
# Also search for point_transactions references in queries/users.ts
rg -nP --type=ts -C5 'getUserProfile|point_transactions' -g '**/queries/users.ts'🤖 Prompt for AI Agents
In frontend/app/[locale]/dashboard/page.tsx around line 45, the code still reads
user.points but the migration removed that column; update data flow so points
are computed from point_transactions (SUM of point_transactions.points) and
returned as a numeric field (e.g. points or pointsTotal) by getUserProfile, or
fetch points in a separate query and pass that value into this component; change
the component to use the new returned field (or the separately fetched variable)
instead of user.points and ensure types/null handling use 0 as a fallback.
| const [endTime] = useState(() => Date.now() + timeLimitSeconds * 1000); | ||
| const [remainingSeconds, setRemainingSeconds] = useState(timeLimitSeconds); |
There was a problem hiding this comment.
endTime won't update if timeLimitSeconds prop changes.
The useState initializer only runs once. If this component is reused without unmounting (e.g., navigating between quizzes), the endTime will remain stale while timeLimitSeconds changes, causing incorrect countdown and percentage calculation (line 55 uses timeLimitSeconds directly).
Either ensure the parent passes a key prop to force remount on quiz change, or recalculate endTime when timeLimitSeconds changes:
Option: Reset endTime on timeLimitSeconds change
- const [endTime] = useState(() => Date.now() + timeLimitSeconds * 1000);
+ const [endTime, setEndTime] = useState(() => Date.now() + timeLimitSeconds * 1000);
const [remainingSeconds, setRemainingSeconds] = useState(timeLimitSeconds);
+ useEffect(() => {
+ setEndTime(Date.now() + timeLimitSeconds * 1000);
+ setRemainingSeconds(timeLimitSeconds);
+ }, [timeLimitSeconds]);📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| const [endTime] = useState(() => Date.now() + timeLimitSeconds * 1000); | |
| const [remainingSeconds, setRemainingSeconds] = useState(timeLimitSeconds); | |
| const [endTime, setEndTime] = useState(() => Date.now() + timeLimitSeconds * 1000); | |
| const [remainingSeconds, setRemainingSeconds] = useState(timeLimitSeconds); | |
| useEffect(() => { | |
| setEndTime(Date.now() + timeLimitSeconds * 1000); | |
| setRemainingSeconds(timeLimitSeconds); | |
| }, [timeLimitSeconds]); |
🤖 Prompt for AI Agents
frontend/components/quiz/CountdownTimer.tsx around lines 17 to 18: endTime is
initialized once with useState(() => Date.now() + timeLimitSeconds * 1000) so it
will stay stale if the timeLimitSeconds prop changes; update the component to
recalculate endTime whenever timeLimitSeconds changes (and reset
remainingSeconds) instead of relying on a one-time initializer — e.g., store
endTime in state and add a useEffect that sets endTime = Date.now() +
timeLimitSeconds * 1000 and setRemainingSeconds(timeLimitSeconds) when
timeLimitSeconds changes; alternatively, document that callers must force a
remount by passing a key when timeLimitSeconds changes.
| if (!partArg) { | ||
| console.error('Error: Please specify which part to upload'); | ||
| console.log('Usage: npx tsx db/seeds/seed-quiz-javascript.ts <part-number>'); | ||
| console.log('Example: npx tsx db/seeds/seed-quiz-javascript.ts 1'); | ||
| console.log('Or upload all: npx tsx db/seeds/seed-quiz-javascript.ts all'); |
There was a problem hiding this comment.
CLI usage message shows incorrect file path.
The usage message references db/seeds/seed-quiz-javascript.ts but the actual file is seed-quiz-javascript-advanced.ts. This could confuse users.
🔎 Proposed fix
- console.log('Usage: npx tsx db/seeds/seed-quiz-javascript.ts <part-number>');
- console.log('Example: npx tsx db/seeds/seed-quiz-javascript.ts 1');
- console.log('Or upload all: npx tsx db/seeds/seed-quiz-javascript.ts all');
+ console.log('Usage: npx tsx db/seed-quiz-javascript-advanced.ts <part-number>');
+ console.log('Example: npx tsx db/seed-quiz-javascript-advanced.ts 1');
+ console.log('Or upload all: npx tsx db/seed-quiz-javascript-advanced.ts all');📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| if (!partArg) { | |
| console.error('Error: Please specify which part to upload'); | |
| console.log('Usage: npx tsx db/seeds/seed-quiz-javascript.ts <part-number>'); | |
| console.log('Example: npx tsx db/seeds/seed-quiz-javascript.ts 1'); | |
| console.log('Or upload all: npx tsx db/seeds/seed-quiz-javascript.ts all'); | |
| if (!partArg) { | |
| console.error('Error: Please specify which part to upload'); | |
| console.log('Usage: npx tsx db/seed-quiz-javascript-advanced.ts <part-number>'); | |
| console.log('Example: npx tsx db/seed-quiz-javascript-advanced.ts 1'); | |
| console.log('Or upload all: npx tsx db/seed-quiz-javascript-advanced.ts all'); |
🤖 Prompt for AI Agents
In frontend/db/seed-quiz-javascript-advanced.ts around lines 186 to 190, the CLI
usage and example messages reference the wrong filename
(db/seeds/seed-quiz-javascript.ts); update those strings to reference the actual
file path/name (seed-quiz-javascript-advanced.ts) so the usage, example and
"upload all" guidance reflect the correct script path.
| DROP INDEX "quiz_attempts_user_id_idx";--> statement-breakpoint | ||
| DROP INDEX "quiz_attempts_quiz_id_idx";--> statement-breakpoint |
There was a problem hiding this comment.
Major performance regression: Dropping essential indices.
Removing quiz_attempts_user_id_idx and quiz_attempts_quiz_id_idx will severely degrade query performance for common operations:
- getUserQuizStats(userId) - requires full table scan without
user_idindex - Finding previous best attempts - needs
user_id+quiz_idfor the "MAX(pointsEarned)" optimization mentioned in PR objectives - Leaderboard queries - likely join on quiz_attempts by user_id
- Quiz-specific attempt lookups - need
quiz_idindex
The PR states "Optimize previous-best lookup using MAX(pointsEarned)" but removing these indices contradicts that goal.
🔎 Verify query patterns requiring these indices
#!/bin/bash
# Description: Find queries that filter by user_id or quiz_id on quiz_attempts
# Search for queries filtering quiz_attempts by userId
rg -nP --type=ts -C3 'quiz_?attempts.*userId|where.*userId.*quiz_?attempts' -g '**/queries/**'
# Search for queries filtering by quizId
rg -nP --type=ts -C3 'quiz_?attempts.*quizId|where.*quizId.*quiz_?attempts' -g '**/queries/**'
# Check getUserQuizStats implementation
ast-grep --pattern $'export async function getUserQuizStats($$$) {
$$$
}'Recommendation: Keep or re-add these indices. Consider a composite index on (user_id, quiz_id, points_earned) for the best-attempt lookup optimization.
🤖 Prompt for AI Agents
In frontend/drizzle/0010_parallel_princess_powerful.sql around lines 1-2, the
migration drops two critical indices (quiz_attempts_user_id_idx and
quiz_attempts_quiz_id_idx) which will cause major query regressions; restore
these indices by removing the DROP INDEX lines from this migration, or replace
them with CREATE INDEX statements that re-add the single-column indexes, and for
the "previous-best" optimization add a composite index on (user_id, quiz_id,
points_earned) (or at minimum a composite (user_id, quiz_id) plus an index on
points_earned) so queries like getUserQuizStats, previous-best lookups,
leaderboard joins, and quiz-specific lookups retain efficient plans.
| function decodeAuthToken(token: string): AuthTokenPayload | null { | ||
| const parts = token.split("."); | ||
| if (parts.length < 2) return null; | ||
|
|
||
| const base64 = parts[1].replace(/-/g, "+").replace(/_/g, "/"); | ||
| const padded = base64.padEnd(base64.length + (4 - (base64.length % 4)) % 4, "="); | ||
|
|
||
| try { | ||
| const json = atob(padded); | ||
| const payload = JSON.parse(json) as Partial<AuthTokenPayload>; | ||
| if ( | ||
| typeof payload.userId !== "string" || | ||
| (payload.role !== "user" && payload.role !== "admin") || | ||
| typeof payload.email !== "string" || | ||
| typeof payload.exp !== "number" | ||
| ) { | ||
| return null; | ||
| } | ||
| return payload as AuthTokenPayload; | ||
| } catch { | ||
| return null; | ||
| } | ||
| } |
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Critical: JWT signature verification is missing.
The decodeAuthToken function manually parses the JWT payload without verifying the cryptographic signature. This creates a critical security vulnerability where an attacker could forge a token with arbitrary userId, role, email, and exp values. The forged token would pass validation as long as it's properly formatted JSON.
🔎 Use a proper JWT library with signature verification
+import { jwtVerify } from 'jose';
+
-function decodeAuthToken(token: string): AuthTokenPayload | null {
- const parts = token.split(".");
- if (parts.length < 2) return null;
-
- const base64 = parts[1].replace(/-/g, "+").replace(/_/g, "/");
- const padded = base64.padEnd(base64.length + (4 - (base64.length % 4)) % 4, "=");
-
- try {
- const json = atob(padded);
- const payload = JSON.parse(json) as Partial<AuthTokenPayload>;
- if (
- typeof payload.userId !== "string" ||
- (payload.role !== "user" && payload.role !== "admin") ||
- typeof payload.email !== "string" ||
- typeof payload.exp !== "number"
- ) {
- return null;
- }
- return payload as AuthTokenPayload;
- } catch {
- return null;
- }
+async function decodeAuthToken(token: string): Promise<AuthTokenPayload | null> {
+ try {
+ const secret = new TextEncoder().encode(AUTH_SECRET);
+ const { payload } = await jwtVerify(token, secret);
+
+ if (
+ typeof payload.userId !== "string" ||
+ (payload.role !== "user" && payload.role !== "admin") ||
+ typeof payload.email !== "string" ||
+ typeof payload.exp !== "number"
+ ) {
+ return null;
+ }
+ return payload as AuthTokenPayload;
+ } catch {
+ return null;
+ }
}Note: This requires updating isAuthenticated to be async and awaiting the result.
Committable suggestion skipped: line range outside the PR's diff.
🤖 Prompt for AI Agents
In frontend/proxy.ts around lines 19 to 41 the function decodeAuthToken only
base64-decodes and parses the JWT payload without cryptographic signature
verification; replace this manual parsing with a proper JWT verification step
(e.g., use jsonwebtoken/jose) that verifies the token signature with the
configured secret or public key and allowed algorithms, check the exp claim
after verification, throw/return null on verification failure, and update any
callers (like isAuthenticated) to be async and await the verification result;
also remove use of atob and any manual base64 padding logic and ensure
verification errors are handled and logged appropriately.
There was a problem hiding this comment.
Actionable comments posted: 1
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
frontend/lib/auth.ts (1)
42-60: Add validation for the exp field in the type guard.The
isAuthTokenPayloadtype guard validatesuserId,role, andexpfield. This creates a type safety gap where tokens without or with invalidexpvalues could incorrectly pass validation.🔎 Proposed fix to validate the exp field
function isAuthTokenPayload(value: unknown): value is AuthTokenPayload { if (typeof value !== "object" || value === null) return false; - if (!("userId" in value) || !("role" in value) || !("email" in value)) { + if (!("userId" in value) || !("role" in value) || !("email" in value) || !("exp" in value)) { return false; } const v = value as { userId: unknown; role: unknown; email: unknown; + exp: unknown; }; return ( typeof v.userId === "string" && typeof v.email === "string" && - (v.role === "user" || v.role === "admin") + (v.role === "user" || v.role === "admin") && + typeof v.exp === "number" ); }
♻️ Duplicate comments (6)
frontend/proxy.ts (1)
13-35: Critical: JWT signature verification is still missing.As previously flagged, the
decodeAuthTokenfunction only decodes and parses the JWT payload without verifying the cryptographic signature. An attacker can forge tokens with arbitraryuserId,role,expvalues that will be accepted as valid.Additionally, this duplicates logic already present in
verifyAuthToken(lines 62-74 infrontend/lib/auth.ts), which properly usesjwt.verifyfor signature verification.🔎 Proposed fix using the existing verifyAuthToken function
Since
verifyAuthTokenalready exists infrontend/lib/auth.ts, import and use it instead:-import { AuthTokenPayload } from '@/lib/auth'; +import { AuthTokenPayload, verifyAuthToken } from '@/lib/auth'; const AUTH_COOKIE_NAME = 'auth_session'; -const AUTH_SECRET = process.env.AUTH_SECRET; -if (!AUTH_SECRET) { - throw new Error('AUTH_SECRET is not defined'); -} - -function decodeAuthToken(token: string): AuthTokenPayload | null { - const parts = token.split("."); - if (parts.length < 2) return null; - - const base64 = parts[1].replace(/-/g, "+").replace(/_/g, "/"); - const padded = base64.padEnd(base64.length + (4 - (base64.length % 4)) % 4, "="); - - try { - const json = atob(padded); - const payload = JSON.parse(json) as Partial<AuthTokenPayload>; - if ( - typeof payload.userId !== "string" || - (payload.role !== "user" && payload.role !== "admin") || - typeof payload.email !== "string" || - typeof payload.exp !== "number" - ) { - return null; - } - return payload as AuthTokenPayload; - } catch { - return null; - } -} - function isAuthenticated(req: NextRequest): boolean { const token = req.cookies.get(AUTH_COOKIE_NAME)?.value; if (!token) return false; - const payload = decodeAuthToken(token); + const payload = verifyAuthToken(token); if (!payload) return false; const now = Math.floor(Date.now() / 1000); return payload.exp > now; }frontend/app/[locale]/dashboard/page.tsx (1)
45-45: Verify that getUserProfile returns computed points from ledger.The past review comment correctly flagged that the
pointscolumn was dropped from theuserstable. According to the enriched summary,getUserProfileshould now compute points frompoint_transactions. This line will work correctly ifgetUserProfileproperly aggregates and returns apointsfield.Run the following script to verify that
getUserProfilecomputes points from thepoint_transactionstable:#!/bin/bash # Description: Verify getUserProfile implementation computes points from point_transactions # Check getUserProfile implementation ast-grep --pattern $'export async function getUserProfile($$$) { $$$ }' # Search for point_transactions references in the queries/users file rg -nP --type=ts -C10 'getUserProfile' -g '**/queries/users.ts' # Verify point_transactions aggregation logic rg -nP --type=ts -C5 'SUM.*point_transactions|point_transactions.*SUM' -g '**/queries/**'frontend/db/seed-quiz-javascript-advanced.ts (2)
1-1: BOM character detected.This issue was already flagged in a previous review.
186-191: CLI usage message shows incorrect file path.This issue was already flagged in a previous review.
frontend/components/quiz/QuizResult.tsx (1)
142-146: Debug console.log statement.This issue was already flagged in a previous review.
frontend/db/seed-quiz-css.ts (1)
186-191: Usage instructions reference incorrect path.This issue was already flagged in a previous review.
🧹 Nitpick comments (10)
frontend/db/seed-quiz-javascript-advanced.ts (1)
212-212: Hardcoded answer count assumption.The calculation assumes exactly 4 answers per question (
* 4). If the question format changes to support variable answer counts, this will be incorrect. Consider computing the actual total from the loaded data.🔎 Alternative approach
Track the actual answer count while seeding:
for (let i = 1; i <= 4; i++) { const questions = await loadQuestions(i); await seedQuestions(questions, quizId, i); totalQuestions += questions.length; + totalAnswers += questions.reduce((sum, q) => sum + q.answers.length, 0); } console.log('\nAll parts seeded successfully!'); console.log(` - 1 quiz with ${LOCALES.length} translations`); console.log(` - ${totalQuestions} questions total`); - console.log(` - ${totalQuestions * 4} answers with ${LOCALES.length} translations each`); + console.log(` - ${totalAnswers} answers with ${LOCALES.length} translations each`);Apply the same pattern at line 227.
frontend/components/quiz/QuizResult.tsx (1)
116-132: Consider extracting nested ternaries for clarity.The nested ternary operators for styling and content could be extracted into computed values or a helper function to improve readability.
🔎 Possible refactor
+ const pointsStyles = pointsAwarded > 0 + ? { + container: 'bg-green-50 dark:bg-green-900/20 border-green-200 dark:border-green-800', + text: 'text-green-800 dark:text-green-200', + message: `+${pointsAwarded} балів додано до рейтингу` + } + : { + container: 'bg-gray-50 dark:bg-gray-900/20 border-gray-200 dark:border-gray-800', + text: 'text-gray-600 dark:text-gray-400', + message: 'Бали не нараховано (результат не покращено)' + }; + {!isGuest && pointsAwarded !== null && pointsAwarded !== undefined && ( - <div className={`p-4 rounded-xl border ${ - pointsAwarded > 0 - ? 'bg-green-50 dark:bg-green-900/20 border-green-200 dark:border-green-800' - : 'bg-gray-50 dark:bg-gray-900/20 border-gray-200 dark:border-gray-800' - }`}> - <p className={`text-center font-medium ${ - pointsAwarded > 0 - ? 'text-green-800 dark:text-green-200' - : 'text-gray-600 dark:text-gray-400' - }`}> - {pointsAwarded > 0 - ? `+${pointsAwarded} балів додано до рейтингу` - : 'Бали не нараховано (результат не покращено)'} + <div className={`p-4 rounded-xl border ${pointsStyles.container}`}> + <p className={`text-center font-medium ${pointsStyles.text}`}> + {pointsStyles.message} </p> </div> )}frontend/db/seed-quiz-css.ts (1)
212-212: Hardcoded answer count assumption.The calculation assumes exactly 4 answers per question (
* 4). Consider computing the actual total from the loaded data for better maintainability.🔎 Alternative approach
Track the actual answer count while seeding (same pattern as suggested for the JavaScript seed):
for (let i = 1; i <= 4; i++) { const questions = await loadQuestions(i); await seedQuestions(questions, quizId, i); totalQuestions += questions.length; + totalAnswers += questions.reduce((sum, q) => sum + q.answers.length, 0); } console.log('\nAll parts seeded successfully!'); console.log(` - 1 quiz with ${LOCALES.length} translations`); console.log(` - ${totalQuestions} questions total`); - console.log(` - ${totalQuestions * 4} answers with ${LOCALES.length} translations each`); + console.log(` - ${totalAnswers} answers with ${LOCALES.length} translations each`);Apply the same pattern at line 227.
json/quizzes/css/advanced/seed-quiz-css-advanced.ts (2)
199-207: Running "all" multiple times may create duplicate questions.When
ensureQuizExists()is called, it deletes existing questions for the quiz. However, when seeding individual parts (e.g.,seedQuizFromJson 1thenseedQuizFromJson 2), the second run callsensureQuizExists()again which clears all questions including part 1. This design means:
- Running
allworks correctly (clears then seeds all)- Running individual parts sequentially will lose previously seeded parts
This may be intentional, but worth documenting in the usage instructions that individual part seeding replaces all content.
64-68: Consider adding file existence check before reading.
readFileSyncwill throw if the file doesn't exist. Adding a check would provide a clearer error message.🔎 Proposed improvement
+import { existsSync, readFileSync } from 'fs'; async function loadQuestions(partNumber: number): Promise<QuestionData[]> { const partPath = join(process.cwd(), 'data', `css-advanced-quiz-part${partNumber}.json`); + if (!existsSync(partPath)) { + throw new Error(`Quiz data file not found: ${partPath}`); + } const partData: QuizPartData = JSON.parse(readFileSync(partPath, 'utf-8')); return partData.questions; }json/quizzes/css/fundamentals/seed-quiz-css.ts (1)
1-240: Significant code duplication with seed-quiz-css-advanced.ts.This file shares ~95% of its code with
seed-quiz-css-advanced.ts. Consider extracting shared logic into a reusable seed utility to reduce duplication and maintenance burden.The following could be extracted into a shared module:
Localetype andLOCALESconstantQuestionDataandQuizPartDatainterfacescreateExplanationfunctionloadQuestionsfunction (parameterized by path pattern)ensureQuizExistsfunction (parameterized by metadata)seedQuestionsfunction- CLI parsing logic in
seedQuizFromJson🔎 Example shared utility structure
// db/seed-utils/quiz-seeder.ts export interface QuizSeedConfig { categorySlug: string; quizSlug: string; displayOrder: number; questionsCount: number; timeLimitSeconds: number; translations: Record<Locale, { title: string; description: string }>; dataPathPattern: string; // e.g., 'css-quiz-part{n}.json' maxParts: number; } export async function seedQuiz(config: QuizSeedConfig) { // Shared implementation }Then each seed script becomes:
// seed-quiz-css.ts import { seedQuiz } from './seed-utils/quiz-seeder'; seedQuiz({ categorySlug: 'css', quizSlug: 'css-fundamentals', ... });frontend/actions/quiz.ts (2)
10-10: Minor formatting: add space after comma in import.The import statement is missing a space after the comma between
awardQuizPointsandcalculateQuizPoints.🔎 Proposed fix
-import { awardQuizPoints,calculateQuizPoints } from '@/db/queries/points'; +import { awardQuizPoints, calculateQuizPoints } from '@/db/queries/points';
154-157: Consider rejecting invalid timestamps instead of silent fallback.The code falls back to
new Date()whenanswer.answeredAtis invalid. While defensive, this could mask data quality issues and create misleading timestamps in the audit trail.Consider returning an error instead:
🔎 Alternative approach
const answeredAt = new Date(answer.answeredAt); - const safeAnsweredAt = Number.isNaN(answeredAt.getTime()) - ? new Date() - : answeredAt; + if (Number.isNaN(answeredAt.getTime())) { + return { success: false, error: 'Invalid timestamp in answer' }; + } answerResults.push({ questionId: answer.questionId, selectedAnswerId: answer.selectedAnswerId, isCorrect, - answeredAt: safeAnsweredAt, + answeredAt, });frontend/app/api/quiz/guest-result/route.ts (2)
37-100: LGTM: Comprehensive validation matches quiz.ts pattern.The validation flow correctly implements the same thorough checks as
frontend/actions/quiz.ts:
- Quiz existence and question count matching
- Answer payload structure validation
- Question validity and duplicate detection
- Batch answer loading to avoid N+1 queries
Optional: Consider extracting the shared validation logic between this file and
frontend/actions/quiz.tsinto a shared utility function to reduce duplication and ensure consistency.
120-127: Consider building attemptAnswers after getting attemptId.The placeholder
attemptId: ""(line 121) is later overwritten via spread operator (lines 158-161). While functional, this pattern is less clear than building the array after obtaining the actual attempt ID.🔎 Alternative approach
const attemptAnswers = []; for (const answer of answers) { const record = answerById.get(answer.selectedAnswerId); if (!record || record.quizQuestionId !== answer.questionId) { return NextResponse.json( { success: false, error: "Answer does not match question" }, { status: 400 } ); } const isCorrect = record.isCorrect; if (isCorrect) correctAnswersCount++; attemptAnswers.push({ - attemptId: "", quizQuestionId: answer.questionId, selectedAnswerId: answer.selectedAnswerId, isCorrect, answeredAt: now, }); } // ... later ... await db.insert(quizAttemptAnswers).values( - attemptAnswers.map(a => ({ - ...a, + attemptAnswers.map(a => ({ + ...a, attemptId: attempt.id, })) );Actually, on second thought, the current implementation is fine since the attemptId must be added after the insert. The spread operator pattern is appropriate here.
📜 Review details
Configuration used: defaults
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (43)
frontend/actions/quiz.tsfrontend/app/[locale]/dashboard/page.tsxfrontend/app/api/auth/signup/route.tsfrontend/app/api/quiz/guest-result/route.tsfrontend/components/quiz/QuizResult.tsxfrontend/db/seed-quiz-css.tsfrontend/db/seed-quiz-html-advanced.tsfrontend/db/seed-quiz-html.tsfrontend/db/seed-quiz-javascript-advanced.tsfrontend/lib/auth.tsfrontend/proxy.tsjson/quizzes/css/advanced/css-advanced-quiz-part1.jsonjson/quizzes/css/advanced/css-advanced-quiz-part2.jsonjson/quizzes/css/advanced/css-advanced-quiz-part3.jsonjson/quizzes/css/advanced/css-advanced-quiz-part4.jsonjson/quizzes/css/advanced/seed-quiz-css-advanced.tsjson/quizzes/css/fundamentals/css-quiz-part1.jsonjson/quizzes/css/fundamentals/css-quiz-part2.jsonjson/quizzes/css/fundamentals/css-quiz-part3.jsonjson/quizzes/css/fundamentals/css-quiz-part4.jsonjson/quizzes/css/fundamentals/seed-quiz-css.tsjson/quizzes/git/git-quiz-part1.jsonjson/quizzes/git/git-quiz-part2.jsonjson/quizzes/git/git-quiz-part3.jsonjson/quizzes/git/git-quiz-part4.jsonjson/quizzes/html/advanced/html-advanced-quiz-part1.jsonjson/quizzes/html/advanced/html-advanced-quiz-part2.jsonjson/quizzes/html/advanced/html-advanced-quiz-part3.jsonjson/quizzes/html/advanced/html-advanced-quiz-part4.jsonjson/quizzes/html/fundamentals/html-quiz-part1.jsonjson/quizzes/html/fundamentals/html-quiz-part2.jsonjson/quizzes/html/fundamentals/html-quiz-part3.jsonjson/quizzes/html/fundamentals/html-quiz-part4.jsonjson/quizzes/js/advanced/javascript-advanced-quiz-part1.jsonjson/quizzes/js/advanced/javascript-advanced-quiz-part2.jsonjson/quizzes/js/advanced/javascript-advanced-quiz-part3.jsonjson/quizzes/js/advanced/javascript-advanced-quiz-part4.jsonjson/quizzes/js/fundamentals/javascript-quiz-part1.jsonjson/quizzes/js/fundamentals/javascript-quiz-part2.jsonjson/quizzes/js/fundamentals/javascript-quiz-part3.jsonjson/quizzes/js/fundamentals/javascript-quiz-part4.jsonjson/quizzes/react/react-quiz-data-part1.jsonjson/quizzes/react/react-quiz-data-part2.json
✅ Files skipped from review due to trivial changes (4)
- json/quizzes/git/git-quiz-part3.json
- json/quizzes/html/fundamentals/html-quiz-part4.json
- json/quizzes/css/fundamentals/css-quiz-part1.json
- json/quizzes/git/git-quiz-part2.json
🚧 Files skipped from review as they are similar to previous changes (3)
- frontend/app/api/auth/signup/route.ts
- frontend/db/seed-quiz-html.ts
- frontend/db/seed-quiz-html-advanced.ts
🧰 Additional context used
🧬 Code graph analysis (6)
frontend/proxy.ts (1)
frontend/lib/auth.ts (1)
AuthTokenPayload(23-28)
frontend/db/seed-quiz-javascript-advanced.ts (2)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (7)
quizzes(19-42)quizAttempts(129-164)quizQuestions(59-79)quizTranslations(44-57)quizQuestionContent(81-94)quizAnswers(96-111)quizAnswerTranslations(113-127)
frontend/app/api/quiz/guest-result/route.ts (4)
frontend/lib/auth.ts (1)
getCurrentUser(95-116)frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (4)
quizQuestions(59-79)quizAnswers(96-111)quizAttempts(129-164)quizAttemptAnswers(166-192)frontend/db/queries/points.ts (1)
calculateQuizPoints(7-12)
json/quizzes/css/advanced/seed-quiz-css-advanced.ts (1)
frontend/db/index.ts (1)
db(39-39)
json/quizzes/css/fundamentals/seed-quiz-css.ts (1)
frontend/db/index.ts (1)
db(39-39)
frontend/db/seed-quiz-css.ts (2)
frontend/db/index.ts (1)
db(39-39)frontend/db/schema/quiz.ts (7)
quizzes(19-42)quizAttempts(129-164)quizQuestions(59-79)quizTranslations(44-57)quizQuestionContent(81-94)quizAnswers(96-111)quizAnswerTranslations(113-127)
🔇 Additional comments (34)
frontend/lib/auth.ts (1)
27-27: Good addition of the exp field.This change addresses the duplicate type definition issue from the previous review and aligns with standard JWT payload structure.
frontend/proxy.ts (2)
4-4: Good refactor to import the shared type.This addresses the past review comment about duplicate type definitions and follows the DRY principle.
37-46: Expiration validation is correct but depends on insecure token parsing.The expiration check logic (lines 44-45) correctly validates that the token hasn't expired. However, this function depends on the insecure
decodeAuthTokenthat lacks signature verification. OncedecodeAuthTokenis replaced withverifyAuthToken(as suggested above), the overall authentication flow will be secure.json/quizzes/html/fundamentals/html-quiz-part2.json (1)
1-434: Excellent quiz data structure and content!The HTML fundamentals quiz data is well-structured with:
- Consistent JSON schema across all 10 questions
- Proper multilingual support (Ukrainian, English, Polish)
- Each question has exactly one correct answer
- Appropriate difficulty levels and clear explanations
- Factually accurate HTML content
The questions cover essential HTML topics (global attributes, hyperlinks, images, URLs) and the answer options are well-designed with plausible distractors.
json/quizzes/html/fundamentals/html-quiz-part1.json (1)
1-434: Well-crafted foundational quiz content!The first part of the HTML fundamentals quiz is well-executed with:
- Clear and accurate explanations of core HTML concepts
- Consistent multilingual implementation
- Properly marked correct answers
- Appropriate beginner-level difficulty for introductory topics
The questions progress logically from HTML basics (abbreviation, role) through document structure (DOCTYPE, head/body) to element types (void elements, block vs inline, semantic markup).
json/quizzes/html/fundamentals/html-quiz-part3.json (1)
1-434: Comprehensive quiz content covering forms and tables!The third part of the HTML fundamentals quiz maintains the high quality of the previous parts:
- Well-structured questions on lists, forms, and tables
- Accurate technical details (GET vs POST, HTML5 input types, semantic table elements)
- Appropriate difficulty progression (mix of beginner and medium)
- Consistent multilingual translations
The coverage of form elements (,
, , ) and table semantics (, , ) is particularly thorough and educationally sound.json/quizzes/css/advanced/css-advanced-quiz-part1.json (1)
1-234: LGTM! Well-structured multilingual quiz data.The JSON structure is consistent across all 10 questions, with proper multilingual support (uk, en, pl) for questions, explanations, and answers. The CSS content appears technically accurate and covers advanced topics appropriately.
json/quizzes/css/advanced/css-advanced-quiz-part3.json (1)
1-234: LGTM! Comprehensive advanced CSS topics.The quiz data is well-structured with consistent multilingual support. The content covers important advanced CSS concepts including 3D transforms, performance optimization (reflow/repaint, Critical CSS, selector performance), and CSS methodologies (OOCSS, ITCSS). Technical accuracy appears sound.
json/quizzes/css/advanced/css-advanced-quiz-part4.json (1)
1-234: AI summary incorrectly describes TypeScript content; actual content is CSS.The AI-generated summary mentions TypeScript topics (distributive conditional types, async iterators, Value Objects in DDD, etc.), but the actual file contains CSS questions about aspect-ratio, pseudo-classes, layout techniques, and custom properties. The actual CSS content is well-structured and technically accurate.
json/quizzes/css/advanced/css-advanced-quiz-part2.json (1)
1-234: LGTM! Good coverage of CSS tooling and modern techniques.The quiz data is properly structured with multilingual support. Content covers important topics including responsive design, CSS animations, preprocessors, modern CSS tooling (Modules, CSS-in-JS, Stylelint), and accessibility features (:focus-visible). Technical accuracy is sound.
json/quizzes/html/advanced/html-advanced-quiz-part4.json (1)
1-434: Well-structured quiz data.The JSON structure is consistent and well-formed. All questions include proper multilingual support (uk/en/pl), appropriate difficulty levels, and exactly one correct answer per question. The content covers relevant HTML advanced topics effectively.
json/quizzes/js/advanced/javascript-advanced-quiz-part1.json (1)
1-434: Well-structured quiz data.The JSON structure is consistent and well-formed. All questions include proper multilingual support (uk/en/pl), appropriate difficulty levels, and one correct answer per question. The content effectively covers JavaScript fundamentals through advanced concepts (call/apply/bind, array methods, IIFE, comparison operators, object references).
json/quizzes/html/advanced/html-advanced-quiz-part1.json (1)
1-434: LGTM! Well-structured quiz data.The HTML advanced quiz part 1 is well-structured with complete multilingual translations (Ukrainian, English, Polish), proper difficulty levels, and technically accurate content. Each question has exactly one correct answer, and the explanations are clear and informative.
json/quizzes/git/git-quiz-part1.json (1)
1-434: LGTM! Comprehensive Git beginner quiz.The Git quiz part 1 covers fundamental concepts with accurate technical content, complete translations across three languages, and proper structure. Each question has exactly one correct answer and appropriate difficulty levels for beginners.
json/quizzes/git/git-quiz-part4.json (1)
1-434: LGTM! Advanced Git concepts covered well.Git quiz part 4 provides good coverage of intermediate to advanced Git topics (LFS, shallow clones, submodules, security) with accurate content and complete multilingual support. Structure is consistent and each question has exactly one correct answer.
json/quizzes/html/advanced/html-advanced-quiz-part3.json (1)
1-434: Well-structured advanced HTML quiz with modern web standards.The HTML advanced quiz part 3 covers important modern web technologies (Web Components, Shadow DOM, Custom Elements, SEO, performance) with complete multilingual translations and proper structure. Content is generally accurate, with one minor clarification needed regarding h1 usage in HTML5.
json/quizzes/css/fundamentals/css-quiz-part3.json (1)
1-434: LGTM! Comprehensive CSS fundamentals coverage.The CSS quiz part 3 covers essential modern CSS concepts (Grid, Flexbox, media queries, animations, units, variables) with accurate technical content and complete multilingual translations. All 10 questions are properly structured with exactly one correct answer each.
Note: The AI summary mentions "9 questions" but the file actually contains 10 questions (css-q21 through css-q30).
json/quizzes/html/advanced/html-advanced-quiz-part2.json (1)
1-434: LGTM!The quiz data file is well-structured with consistent multilingual content across all 10 questions. Each question properly includes:
- Unique ID and order
- Translations for all three locales (uk/en/pl)
- Four answer options with exactly one correct answer per question
- Appropriate difficulty levels
json/quizzes/css/fundamentals/css-quiz-part4.json (1)
1-434: LGTM!The CSS fundamentals quiz part 4 data is well-structured with accurate CSS content covering modern topics like
:has(),@supports, and BEM methodology. All questions have proper multilingual translations and correct answer flags.json/quizzes/js/advanced/javascript-advanced-quiz-part2.json (1)
1-434: LGTM!The JavaScript advanced quiz part 2 data is well-structured with accurate JavaScript concepts. The mix of difficulty levels (beginner, intermediate, advanced) within an "advanced" quiz file provides good progression. All translations and correct answer flags are properly set.
json/quizzes/css/fundamentals/css-quiz-part2.json (1)
1-434: LGTM!The CSS fundamentals quiz part 2 data covers essential CSS concepts like positioning, Flexbox properties, pseudo-classes, and pseudo-elements. Structure is consistent with all required translations and proper answer correctness flags.
json/quizzes/js/advanced/javascript-advanced-quiz-part3.json (1)
1-144: LGTM!The JavaScript advanced quiz part 3 data is well-structured with accurate JavaScript concepts covering array methods, modern operators, and language features. The compact JSON formatting is valid and consistent.
json/quizzes/css/fundamentals/seed-quiz-css.ts (1)
96-97: Same orphaned records concern applies here.See comment on
seed-quiz-css-advanced.tslines 96-97 regarding potential orphanedquizQuestionContent,quizAnswers, andquizAnswerTranslationsrecords.json/quizzes/css/advanced/seed-quiz-css-advanced.ts (1)
96-97: The database schema hasON DELETE CASCADEproperly configured for all related tables:
quizQuestionContentcascades onquizQuestionIdquizAnswerscascades onquizQuestionIdquizAnswerTranslationscascades onquizAnswerIdNo orphaned records will result from the deletion operations at lines 96-97.
frontend/actions/quiz.ts (6)
65-85: LGTM: Helper functions are well-designed.Both
getQuizQuestionIdsandgetAnswerRecordsare clean, focused helpers that support the batch validation flow. The empty array guard ingetAnswerRecords(line 75) is good defensive coding.
91-100: LGTM: Session validation prevents user impersonation.The session authentication check and userId validation correctly prevent unauthorized submissions and user mismatches.
167-187: LGTM: Time validation prevents suspiciously fast completions.The date validation and
validateTimeSpentcheck correctly prevent submissions that are completed unrealistically quickly, which helps maintain quiz integrity.
218-228: LGTM: Defensive conditional insert.The guard
if (answerResults.length > 0)is good defensive coding that prevents unnecessary database operations when there are no answer results to persist.
230-246: LGTM: Points awarding and response structure.The points awarding flow correctly uses
session.idand returns a comprehensive result with all relevant metrics includingpointsAwarded,totalQuestions, and integrity scores.
87-254: Overall: Excellent validation and security improvements.The refactored
submitQuizAttemptfunction implements comprehensive validation that addresses multiple security and integrity concerns:
- Authentication: Session validation prevents unauthorized access
- Input integrity: Batch validation with duplicate detection and answer-question matching
- Performance: Batch queries eliminate N+1 problems (reduces queries as stated in PR objectives)
- Time validation: Prevents unrealistically fast completions
- Points integration: Properly integrates with the new ledger-based points system
The validation flow is thorough, efficient, and well-structured.
frontend/app/api/quiz/guest-result/route.ts (4)
29-35: LGTM: Session validation for guest results.The session check correctly ensures that only the authenticated user can submit results for their own userId, preventing unauthorized submissions.
139-170: LGTM: Persistence flow matches quiz.ts pattern.The persistence logic correctly:
- Stores
pointsEarnedin the attempt record (aligns with ledger-based points system)- Marks guest submissions with
isGuestResult: truein metadata (line 151)- Awards points through
awardQuizPointsfor delta calculation- Returns comprehensive result including
pointsAwarded
10-188: Overall: Solid guest result validation implementation.The guest result API route implements comprehensive validation paralleling
frontend/actions/quiz.ts:✅ Strengths:
- Authentication and authorization checks
- Thorough input validation with duplicate detection
- Batch queries for performance
- Answer-question integrity validation
- Integration with ledger-based points system
- Clear
isGuestResultflag for auditing
⚠️ Note: Unlike the main quiz submission, this route does not enforce minimum time requirements viavalidateTimeSpent. Verify this is intentional for guest results.
133-134: Guest result route skips time validation—confirm if this lenient behavior is intentional.The
startedAttimestamp on line 134 is calculated directly from client-providedtimeSpentSecondswithout enforcing a minimum time window. Unlikefrontend/actions/quiz.ts, this route does not callvalidateTimeSpent, which enforces a minimum of 1 second per question. This means guest results can be submitted withtimeSpentSeconds = 0, creating timestamps wherestartedAtequalscompletedAt.The route explicitly marks results with
isGuestResult: truein metadata, suggesting this is intentional design. However, if time validation should be consistent across all result types, add the samevalidateTimeSpentcheck used infrontend/actions/quiz.ts(lines 51–62 for the function definition, lines 177–187 for usage).
| "id": "html-adv-q26", | ||
| "order": 26, | ||
| "difficulty": "medium", | ||
| "uk": { | ||
| "q": "Яке значення мають заголовки h1-h6 для SEO?", | ||
| "exp": "<h1> — головний заголовок, має бути один на сторінці, сигналізує основну тему. <h2>-<h6> структурують контент ієрархічно. Використання ключових слів у заголовках покращує релевантність." | ||
| }, | ||
| "en": { | ||
| "q": "What importance do h1-h6 headings have for SEO?", | ||
| "exp": "<h1> is the main heading, should be one per page, signals main topic. <h2>-<h6> structure content hierarchically. Using keywords in headings improves relevance." | ||
| }, | ||
| "pl": { | ||
| "q": "Jakie znaczenie mają nagłówki h1-h6 dla SEO?", | ||
| "exp": "<h1> to główny nagłówek, powinien być jeden na stronie, sygnalizuje główny temat. <h2>-<h6> strukturyzują treść hierarchicznie. Używanie słów kluczowych w nagłówkach poprawia trafność." | ||
| }, | ||
| "answers": [ | ||
| { | ||
| "uk": "Заголовки не впливають на SEO", | ||
| "en": "Headings don't affect SEO", | ||
| "pl": "Nagłówki nie wpływają na SEO", | ||
| "correct": false | ||
| }, | ||
| { | ||
| "uk": "h1 один на сторінку, ієрархія h2-h6 структурує контент для пошуковиків", | ||
| "en": "h1 one per page, h2-h6 hierarchy structures content for search engines", | ||
| "pl": "h1 jeden na stronę, hierarchia h2-h6 strukturyzuje treść dla wyszukiwarek", | ||
| "correct": true | ||
| }, | ||
| { | ||
| "uk": "Можна використовувати кілька h1 на сторінці", | ||
| "en": "Can use multiple h1 on a page", | ||
| "pl": "Można używać wielu h1 na stronie", | ||
| "correct": false | ||
| }, | ||
| { | ||
| "uk": "Тільки h1 і h2 впливають на SEO", | ||
| "en": "Only h1 and h2 affect SEO", | ||
| "pl": "Tylko h1 i h2 wpływają na SEO", | ||
| "correct": false | ||
| } | ||
| ] | ||
| }, |
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🧩 Analysis chain
🌐 Web query:
HTML5 specification multiple h1 elements per page allowed
💡 Result:
Short answer: Yes — the HTML5 specs allow multiple
elements (including one per section in earlier drafts), but current guidance and browser/assistive‑tech practice recommends a single page-level
for clarity and accessibility. [1][2][3]
Sources:
- WHATWG HTML Living Standard — headings/sections (shows multiple top-level headings and sectioning rules). [1]
- MDN — heading elements (notes multiple
allowed by the standard but recommends one
per page). [2]
- W3C HTML5 sections documentation (historical spec text describing sectioning and multiple headings). [3]
Update h1 guidance in explanation and correct answer.
The explanation and correct answer state that h1 "should be one per page" as a technical requirement. However, the HTML5 specification allows multiple <h1> elements, particularly when used within sectioning elements like <article>, <section>, <nav>, and <aside>. While using a single <h1> remains the recommended SEO and accessibility best practice, the quiz content presents this as a strict technical rule rather than guidance.
Consider clarifying that one <h1> per page is a best practice for SEO and accessibility, but HTML5 technically permits multiple <h1> elements in certain contexts.
🤖 Prompt for AI Agents
In json/quizzes/html/advanced/html-advanced-quiz-part3.json around lines
219-260, update the question explanation and the correct answer to reflect that
HTML5 technically permits multiple <h1> elements within sectioning elements but
the best practice for SEO and accessibility is to use a single main <h1> per
page; change the "exp" text in uk/en/pl to state this nuance (recommend one per
page for SEO/accessibility, but note HTML5 allows multiple inside
<article>/<section>/<nav>/<aside>), and replace the current correct answer text
("h1 один на сторінку, ієрархія h2-h6...") with a phrasing that marks the
guidance as recommended rather than an absolute rule (e.g., "Рекомендовано одне
h1 на сторінку, але HTML5 допускає кілька в секційних елементах") and keep its
"correct": true flag.
There was a problem hiding this comment.
Actionable comments posted: 1
♻️ Duplicate comments (1)
frontend/proxy.ts (1)
8-11: Critical: JWT signature verification still missing despite previous feedback.This is the same critical security vulnerability flagged in previous reviews. The
decodeAuthTokenfunction decodes and parses the JWT payload without cryptographic signature verification, whileAUTH_SECRETis loaded but never used. An attacker can forge tokens with arbitrary claims that would pass validation.Additionally, there's a type inconsistency:
AuthTokenPayload.expis optional (exp?: number) inlib/auth.ts, but line 27 treats it as required.The previous review provided a detailed solution using the
joselibrary for proper signature verification. This must be implemented before merging to production.🔎 Key changes needed
- Replace manual JWT parsing with proper signature verification using
joseorjsonwebtoken- Make
decodeAuthTokenasync and verify the token signature usingAUTH_SECRET- Update
isAuthenticatedto await the async verification- Align
AuthTokenPayload.exptype (make it required if validation requires it)Also applies to: 13-35
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Review profile: CHILL
Plan: Pro
📒 Files selected for processing (2)
frontend/lib/auth.tsfrontend/proxy.ts
🚧 Files skipped from review as they are similar to previous changes (1)
- frontend/lib/auth.ts
🧰 Additional context used
🧬 Code graph analysis (1)
frontend/proxy.ts (1)
frontend/lib/auth.ts (1)
AuthTokenPayload(23-28)
🔇 Additional comments (2)
frontend/proxy.ts (2)
4-4: LGTM: Import addresses previous feedback.The import of
AuthTokenPayloadfrom@/lib/authcorrectly eliminates the duplicate type definition flagged in previous reviews.
37-46: Logic is sound but requires async signature verification.The authentication check correctly validates token presence, payload structure, and expiration. However, once
decodeAuthTokenis updated to perform proper JWT signature verification (per the critical issue above), this function will need to becomeasyncandawaitthe verification result.Ensure that after implementing signature verification:
isAuthenticatedbecomesasync- Line 41 awaits the verification:
const payload = await decodeAuthToken(token);- Line 52 in
authMiddlewareawaits the call:const authenticated = await isAuthenticated(req);
| typeof payload.userId !== "string" || | ||
| (payload.role !== "user" && payload.role !== "admin") || | ||
| typeof payload.email !== "string" || | ||
| typeof payload.exp !== "number" | ||
| ) { |
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🛠️ Refactor suggestion | 🟠 Major
Resolve type inconsistency for exp field.
AuthTokenPayload.exp is defined as optional (exp?: number) in lib/auth.ts, but the validation here treats it as required (line 27). Since expiration validation is essential for token security, make exp required in the type definition.
🔎 Proposed fix in lib/auth.ts
Update the type definition:
export type AuthTokenPayload = {
userId: string;
role: "user" | "admin";
email: string;
exp: number; // Remove the optional marker
};🤖 Prompt for AI Agents
In frontend/proxy.ts around lines 24–28 the runtime validation treats
payload.exp as required but AuthTokenPayload in lib/auth.ts defines exp as
optional; update lib/auth.ts to make exp mandatory by removing the optional
marker (change exp?: number to exp: number), then run TypeScript checks and
update any call sites that construct AuthTokenPayload to ensure they supply exp
(or compute/set a proper expiration) so the runtime validation and type
definitions are consistent.
Closes Issue #106 #107 #108 #109 #111 #112
Week 4
• Quiz performance:
• Points system refactor (ledger-only):
• Quiz content & seeding:
• UI & logic fixes:
• Leaderboard & DB performance:
Benefits:
Summary by CodeRabbit
New Features
Bug Fixes
Performance
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