Add question bank mastery paths and gap questions

api/QuestionsApi/Controllers/QuestionsController.cs

@@ -55,7 +55,9 @@ public class QuestionsController : ControllerBase
     [Authorize(Roles = "USER,SUPER")]
     public async Task<IActionResult> Search([FromBody] QuestionSearchRequest req)
     {
-        var questions = await _questions.SearchAsync(req, User.IsInRole("SUPER"));
+        List<Question> questions;
+        try { questions = await _questions.SearchAsync(req, User.IsInRole("SUPER")); }
+        catch (ArgumentException exception) { return BadRequest(exception.Message); }
         var percentages = await _statistics.GetPercentagesByQuestionAsync(questions.Select(q => q.ExternalId));
         var questionElos = await _ratings.GetQuestionElosAsync(questions.Select(q => q.ExternalId));
         var bookmarkedIds = await _bookmarks.GetBookmarkedIdsAsync(UserId(), questions.Select(q => q.ExternalId));

api/QuestionsApi/Controllers/ReviewQueueController.cs

@@ -22,9 +22,11 @@ public sealed class ReviewQueueController(
         var userId = UserId();
         if (string.IsNullOrWhiteSpace(userId)) return Unauthorized();
         await queue.EnsureUserQueueAsync(userId);
-        var item = await queue.GetRandomPendingAsync(userId, req.ExcludeExternalIds);
+        ReviewQueueItem? item;
+        try { item = await queue.GetRandomPendingAsync(userId, req.ExcludeExternalIds, req.Step3System); }
+        catch (ArgumentException exception) { return BadRequest(exception.Message); }
         if (item is null)
-            return Ok(new ReviewQueueNextResponse { PendingCount = checked((int)await queue.CountPendingAsync(userId)) });
+            return Ok(new ReviewQueueNextResponse { PendingCount = checked((int)await queue.CountPendingAsync(userId, req.Step3System)) });
 
         var question = await questions.GetByExternalIdAsync(item.QuestionExternalId);
         if (question is null || !question.IsPublished) return NotFound();
@@ -39,7 +41,7 @@ public sealed class ReviewQueueController(
         {
             Question = response,
             Cycle = item.Cycle,
-            PendingCount = checked((int)await queue.CountPendingAsync(userId))
+            PendingCount = checked((int)await queue.CountPendingAsync(userId, req.Step3System))
         });
     }