feat: implement quiz results tracking and caching for user tests

src/lib/db.js

@@ -1,4 +1,5 @@
 import { pb } from './pb';
+import { storage } from './storage';
 
 // Upsert helper: update existing record if found, otherwise create.
 async function pbUpsert(collection, filter, updateData, createData) {
@@ -159,19 +160,65 @@ export async function deleteTeamMember(id) {
   return pb.collection('team_members').delete(id);
 }
 
-// ── Quiz Results (DEPRECATED — collection dropped) ──────────────────────────
+// ── Quiz Results ──────────────────────────────────────────────────────────────
+// Persists one record per user per week in the `test_results` PocketBase
+// collection (recreated in migration 1780900001_created_test_results.js).
 
-/** @deprecated quiz_results collection has been dropped. */
-export async function getQuizResult() { return null; }
-/** @deprecated quiz_results collection has been dropped. */
-export async function saveQuizResult() { return null; }
+export async function saveQuizResult(userId, weekNumber, result) {
+  const data = {
+    user_id:      userId,
+    week_number:  weekNumber,
+    score:        result.score,
+    total:        result.total,
+    percentage:   result.percentage,
+    time_used:    result.timeUsed,
+    completed_at: result.completedAt,
+    breakdown:    result.breakdown,
+    points_earned: result.score * 2,
+  };
+  return pbUpsert(
+    'test_results',
+    `user_id="${userId}" && week_number=${weekNumber}`,
+    data,
+    data,
+  );
+}
 
-// ── Quiz Cache (DEPRECATED — collection dropped) ────────────────────────────
+export async function getQuizResult(userId, weekNumber) {
+  try {
+    const r = await pb.collection('test_results').getFirstListItem(
+      `user_id="${userId}" && week_number=${weekNumber}`,
+    );
+    // Map snake_case PB fields back to the camelCase shape Testen.jsx expects.
+    return {
+      score:        r.score,
+      total:        r.total,
+      percentage:   r.percentage,
+      timeUsed:     r.time_used,
+      completedAt:  r.completed_at,
+      breakdown:    r.breakdown,
+      pointsEarned: r.points_earned,
+    };
+  } catch {
+    return null;
+  }
+}
 
-/** @deprecated quiz_cache collection has been dropped. */
-export async function getCachedQuiz() { return null; }
-/** @deprecated quiz_cache collection has been dropped. */
-export async function setCachedQuiz() { return null; }
+// ── Quiz Cache (localStorage — ephemeral pre-generation) ─────────────────────
+// Stores a pre-generated quiz object in localStorage so the Testen page can
+// skip the LLM call when the user arrives after completing their learning
+// session. The key includes weekNumber so stale entries are silently ignored
+// when the week rolls over.
+
+export function getCachedQuiz(userId, weekNumber) {
+  const cached = storage.get(`quiz_cache:${userId}:${weekNumber}`);
+  return Promise.resolve(cached || null);
+}
+
+export function setCachedQuiz(userId, weekNumber, quiz) {
+  storage.set(`quiz_cache:${userId}:${weekNumber}`, quiz);
+  return Promise.resolve(quiz);
+}
 
 // ── Learn Progress (DEPRECATED — collection dropped) ────────────────────────
 
@@ -347,6 +394,7 @@ export async function resetForSmokeTest({
     'topics',
     'micro_learnings',
     'micro_learning_completions',
+    'test_results',
   ];
   if (includeProgress) collections.push('leaderboard');
 

src/pages/Leren.jsx

@@ -7,6 +7,7 @@ import Button from '../components/ui/Button';
 import Tag from '../components/ui/Tag';
 import { useApp } from '../store/AppContext';
 import { getAssignedTopic } from '../lib/learningService';
+import { generateWeeklyQuiz } from '../lib/testService';
 import { getYearProgress, getCurriculumCycle, getCurriculumWeek, getActiveVersion, getCurrentWeekContent } from '../lib/curriculumService';
 import * as db from '../lib/db';
 import MicroLearningSelector from '../components/micro_learning/MicroLearningSelector';
@@ -86,6 +87,13 @@ const Leren = () => {
 
   const handleTopicCompleted = () => {
     setSessionDone(true);
+    // Pre-generate this week's test questions in the background so they are
+    // ready in localStorage by the time the user navigates to /test. The call
+    // is fire-and-forget — a failure here is harmless; the test page will just
+    // generate on demand as before.
+    if (state.currentUser) {
+      generateWeeklyQuiz(state.currentUser.id, state.weekNumber).catch(() => {});
+    }
   };
 
   // ── Detail View ──────────────────────────────────────────