Add user progress dashboard

api/QuestionsApi/Services/QuestionAttemptStore.cs

@@ -27,6 +27,8 @@ public class QuestionAttemptStore
 
         var createdIndex = Builders<QuestionAttempt>.IndexKeys.Ascending(a => a.CreatedUtc);
         _col.Indexes.CreateOne(new CreateIndexModel<QuestionAttempt>(createdIndex));
+        _col.Indexes.CreateOne(new CreateIndexModel<QuestionAttempt>(
+            Builders<QuestionAttempt>.IndexKeys.Ascending(a => a.UserId).Descending(a => a.CreatedUtc)));
     }
 
     public async Task<QuestionAttemptRecordResult> RecordFirstAttemptAsync(
@@ -35,7 +37,8 @@ public class QuestionAttemptStore
         string choiceId,
         bool isCorrect,
         bool isSkip = false,
-        IReadOnlyCollection<string>? presentedChoiceIds = null)
+        IReadOnlyCollection<string>? presentedChoiceIds = null,
+        int durationSeconds = 0)
     {
         var attempt = new QuestionAttempt
         {
@@ -46,6 +49,7 @@ public class QuestionAttemptStore
             TracksPresentation = presentedChoiceIds is { Count: > 0 },
             IsCorrect = isCorrect,
             IsSkip = isSkip,
+            DurationSeconds = Math.Clamp(durationSeconds, 0, 86_400),
             CounterBucket = GetCounterBucket(userId),
             RatingApplied = false,
             CreatedUtc = DateTime.UtcNow