diff --git a/src/lib/db.js b/src/lib/db.js
index 9c0d11b..e2f1d23 100644
--- a/src/lib/db.js
+++ b/src/lib/db.js
@@ -96,28 +96,14 @@ export async function deleteContent(topicId) {
   } catch { /* no record, nothing to do */ }
 }
 
-// ── Quiz Banks ───────────────────────────────────────────────────────────────
+// ── Quiz Banks (DEPRECATED — collection dropped) ────────────────────────────
 
-function normalizeQuizQuestion(q) {
-  if (!q || typeof q !== 'object') return q;
-  return q.difficulty ? q : { ...q, difficulty: 'medium' };
-}
-
-export async function getQuizBank(topicId) {
-  try {
-    const r = await pb.collection('quiz_banks').getFirstListItem(`topic_id="${topicId}"`);
-    return (r.questions || []).map(normalizeQuizQuestion);
-  } catch { return []; }
-}
-
-export function setQuizBank(topicId, questions) {
-  return pbUpsert('quiz_banks', `topic_id="${topicId}"`, { questions }, { topic_id: topicId, questions });
-}
-
-export async function deleteQuestionFromBank(topicId, questionId) {
-  const questions = await getQuizBank(topicId);
-  return setQuizBank(topicId, questions.filter(q => q.id !== questionId));
-}
+/** @deprecated quiz_banks collection has been dropped. */
+export async function getQuizBank() { return []; }
+/** @deprecated quiz_banks collection has been dropped. */
+export async function setQuizBank() { return null; }
+/** @deprecated quiz_banks collection has been dropped. */
+export async function deleteQuestionFromBank() { return null; }
 
 // ── Sources ──────────────────────────────────────────────────────────────────
 
@@ -173,61 +159,26 @@ export async function deleteTeamMember(id) {
   return pb.collection('team_members').delete(id);
 }
 
-// ── Quiz Results ─────────────────────────────────────────────────────────────
+// ── Quiz Results (DEPRECATED — collection dropped) ──────────────────────────
 
-export async function getQuizResult(userId, weekNumber) {
-  try {
-    return await pb.collection('quiz_results').getFirstListItem(
-      `user_id="${userId}" && week_number=${weekNumber}`
-    );
-  } catch { return null; }
-}
+/** @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) {
-  return pb.collection('quiz_results').create({
-    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.pointsEarned,
-  });
-}
+// ── Quiz Cache (DEPRECATED — collection dropped) ────────────────────────────
 
-// ── Quiz Cache ────────────────────────────────────────────────────────────────
+/** @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; }
 
-export async function getCachedQuiz(userId, weekNumber) {
-  try {
-    return await pb.collection('quiz_cache').getFirstListItem(
-      `user_id="${userId}" && week_number=${weekNumber}`
-    );
-  } catch { return null; }
-}
+// ── Learn Progress (DEPRECATED — collection dropped) ────────────────────────
 
-export function setCachedQuiz(userId, weekNumber, quiz) {
-  const data = { questions: quiz.questions, meta: quiz.meta };
-  return pbUpsert('quiz_cache', `user_id="${userId}" && week_number=${weekNumber}`,
-    data, { user_id: userId, week_number: weekNumber, ...data });
-}
-
-// ── Learn Progress ────────────────────────────────────────────────────────────
-
-export async function getLearnDone(userId, weekNumber) {
-  try {
-    const r = await pb.collection('learn_progress').getFirstListItem(
-      `user_id="${userId}" && week_number=${weekNumber}`
-    );
-    return r.done;
-  } catch { return false; }
-}
-
-export function setLearnDone(userId, weekNumber) {
-  return pbUpsert('learn_progress', `user_id="${userId}" && week_number=${weekNumber}`,
-    { done: true }, { user_id: userId, week_number: weekNumber, done: true });
-}
+/** @deprecated learn_progress collection has been dropped. */
+export async function getLearnDone() { return false; }
+/** @deprecated learn_progress collection has been dropped. */
+export async function setLearnDone() { return null; }
 
 // ── Leaderboard ───────────────────────────────────────────────────────────────
 
@@ -391,14 +342,13 @@ export async function resetForSmokeTest({
   const collections = [
     'relations',
     'content',
-    'quiz_banks',
-    'quiz_results',
-    'quiz_cache',
     'curriculum',
     'sources',
     'topics',
+    'micro_learnings',
+    'micro_learning_completions',
   ];
-  if (includeProgress) collections.push('learn_progress', 'leaderboard');
+  if (includeProgress) collections.push('leaderboard');
 
   const results = [];
   for (const name of collections) {