Reduce answer review scroll redraws

.gitea/scripts/deploy-environment.sh

@@ -98,10 +98,6 @@ if [ "${DEPLOYMENT_ENVIRONMENT}" = "uat" ]; then
     echo "Dynamic question promotion failed after 3 attempts." >&2
     exit 1
   fi
-  kubectl exec -n "${KUBE_NAMESPACE}" "${API_POD}" -- \
-    dotnet QuestionsApi.dll promote-ccs-cases \
-      --source /app/content/ccs/duodenal-ulcer-office-001.json \
-      --apply
 fi
 
 kubectl rollout status deployment/step3-web -n "${KUBE_NAMESPACE}" --timeout=240s

.gitea/workflows/deploy-uat.yml

@@ -7,7 +7,7 @@ on:
     paths-ignore:
       - '**.md'
       - 'tools/**'
-      - 'tests/*.gd'
+      - 'tests/**'
   workflow_dispatch: {}
 
 concurrency:

ENVIRONMENTS.md

@@ -77,41 +77,6 @@ Promotion is idempotent and does not delete or implicitly unpublish PRD content.
 
 ## Verification and rollback
 
-## Step 3 mastery system backfill
-
-The mastery dashboard uses a canonical 14-system classification stored on each
-question. After deploying the mastery-capable API, inspect and apply the
-idempotent backfill in UAT:
-
-```bash
-kubectl exec deployment/step3-api -n step3-uat -- \
-  dotnet QuestionsApi.dll backfill-step3-systems
-kubectl exec deployment/step3-api -n step3-uat -- \
-  dotnet QuestionsApi.dll backfill-step3-systems --apply --confirm BACKFILL_STEP3_SYSTEMS
-```
-
-Review the reported unmapped count before acceptance testing. Repeat the dry run
-and confirmed apply in `step3-prd` after the tested revision is promoted to the
-production branch. The command is safe to rerun and does not modify attempts or
-user data.
-
-## Rz Coin Store attempt-cycle migration
-
-The QBank reset preserves every attempt and increments a user's eligibility cycle. After deploying
-the store-capable API to an environment, inspect and then apply the one-time index migration before
-using QBank reset tokens:
-
-```bash
-kubectl exec deployment/step3-api -n step3-uat -- \
-  dotnet QuestionsApi.dll migrate-question-attempt-cycles
-kubectl exec deployment/step3-api -n step3-uat -- \
-  dotnet QuestionsApi.dll migrate-question-attempt-cycles --apply --confirm MIGRATE_ATTEMPT_CYCLES
-```
-
-Repeat with namespace `step3-prd` after the tested revision is promoted to `production`. The dry run
-reports missing cycle fields and both index states. Apply backfills existing attempts to cycle zero,
-creates the three-field unique index, and only then removes the legacy two-field unique index.
-
 Check both internal and public readiness after every rollout:
 
 ```bash

api/QuestionsApi.Tests/CcsCaseTests.cs

@@ -91,52 +91,6 @@ public sealed class CcsCaseTests
         Assert.True(request!.Cases.Single().ScoringCriteria.Count >= 12);
     }
 
-    [Fact]
-    public void DuodenalUlcerInterviewArtifactMatchesTheCaseSchema()
-    {
-        var path = Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "../../../../../content/ccs/duodenal-ulcer-office-001.json"));
-        var request = JsonSerializer.Deserialize<CcsImportRequest>(File.ReadAllText(path), new JsonSerializerOptions { PropertyNameCaseInsensitive = true });
-
-        Assert.NotNull(request);
-        Assert.Empty(CcsCaseValidator.ValidateImport(request!, new HashSet<string>()));
-        Assert.Equal(CcsExperienceModes.GraphicalInterview, request.Cases.Single().ExperienceMode);
-        var topics = request.Cases.Single().InitialInterview.Topics;
-        Assert.Equal([
-            "chief_concern", "dizziness_character", "fatigue_course", "abdominal_character",
-            "relieving_factors", "associated_gi", "exposure_history", "past_medical_history"
-        ], topics.Select(value => value.Id));
-        Assert.Equal(6, topics.Count(value => value.Required));
-        Assert.Equal(["fatigue_course"], topics.Single(value => value.Id == "abdominal_character").PrerequisiteTopicIds);
-        Assert.All(topics.Where(value => value.Id is "relieving_factors" or "associated_gi" or "exposure_history"),
-            value => Assert.Equal(["abdominal_character"], value.PrerequisiteTopicIds));
-        Assert.False(topics.Single(value => value.Id == "past_medical_history").Required);
-        Assert.Contains("cholesterol was high", topics.Single(value => value.Id == "past_medical_history").PatientText,
-            StringComparison.OrdinalIgnoreCase);
-        Assert.Equal(4, request.Cases.Single().GraphicalPresentation.InterviewRevision);
-        Assert.Equal("Hyperlipidemia", CcsStore.MedicalHistory(request.Cases.Single()));
-        var exams = request.Cases.Single().Exams;
-        Assert.Equal([
-            "physical_appearance", "skin", "breasts", "lymph_nodes", "heent_neck", "chest_lungs",
-            "heart_cardiovascular", "abdomen", "genitalia", "rectal", "extremities_spine", "neuro_psych"
-        ], exams.Select(value => value.Code));
-        Assert.All(exams, value => Assert.Equal(1, value.DurationMinutes));
-        Assert.Contains("mild epigastric tenderness", exams.Single(value => value.Code == "abdomen").Finding,
-            StringComparison.OrdinalIgnoreCase);
-        Assert.Contains("brown stool", exams.Single(value => value.Code == "rectal").Finding,
-            StringComparison.OrdinalIgnoreCase);
-        Assert.Contains(request.Orders, value => value.Code == "h_pylori_breath");
-        Assert.Contains(request.Orders, value => value.Code == "bismuth_quadruple");
-        Assert.Contains(request.Cases.Single().OrderResponses,
-            value => value.OrderCode == "upper_endoscopy" && value.Result.Contains("duodenal", StringComparison.OrdinalIgnoreCase));
-        var endoscopy = request.Cases.Single().OrderResponses.Single(value => value.OrderCode == "upper_endoscopy");
-        Assert.Equal("endoscopy_suite", endoscopy.PerformanceLocation);
-        Assert.True(endoscopy.RequiresPatientVisit);
-        Assert.All(request.Cases.Single().OrderResponses.Where(value => value.RequiresPatientVisit),
-            value => Assert.False(string.IsNullOrWhiteSpace(value.PerformanceLocation)));
-        Assert.Contains(request.Cases.Single().ScoringCriteria,
-            value => value.TargetCode == "ibuprofen" && value.Points < 0);
-    }
-
     [Fact]
     public void PublishedCaseRequiresReferencesAndKnownOrders()
     {
@@ -181,150 +135,6 @@ public sealed class CcsCaseTests
         Assert.Empty(CcsCaseValidator.ValidateImport(ValidImport(), new HashSet<string>()));
     }
 
-    [Fact]
-    public void InteractiveInterviewRequiresAReachableAcyclicGraph()
-    {
-        var request = ValidImport();
-        request.Cases[0].InitialInterview = ValidInterview();
-        Assert.Empty(CcsCaseValidator.ValidateImport(request, new HashSet<string>()));
-
-        request.Cases[0].InitialInterview.Nodes[0].Choices[0].NextNodeId = "missing";
-        var errors = CcsCaseValidator.ValidateImport(request, new HashSet<string>());
-        Assert.Contains(errors, value => value.Contains("unknown next node", StringComparison.OrdinalIgnoreCase));
-
-        request = ValidImport();
-        request.Cases[0].InitialInterview = ValidInterview();
-        request.Cases[0].InitialInterview.Nodes[1].IsTerminal = false;
-        request.Cases[0].InitialInterview.Nodes[1].Choices = [new() { Id = "loop", Text = "Start over", NextNodeId = "greeting" }];
-        errors = CcsCaseValidator.ValidateImport(request, new HashSet<string>());
-        Assert.Contains(errors, value => value.Contains("cycles", StringComparison.OrdinalIgnoreCase));
-
-        request = ValidImport();
-        request.Cases[0].InitialInterview = ValidInterview();
-        request.Cases[0].InitialInterview.Nodes.Add(new() { Id = "orphan", PatientText = "Unreachable", IsTerminal = true });
-        errors = CcsCaseValidator.ValidateImport(request, new HashSet<string>());
-        Assert.Contains(errors, value => value.Contains("reachable", StringComparison.OrdinalIgnoreCase));
-    }
-
-    [Fact]
-    public void DialogueChoicesPersistAndCompleteWithoutAdvancingSimulatedTime()
-    {
-        var definition = ValidImport().Cases[0];
-        definition.InitialInterview = ValidInterview();
-        var attempt = new CcsAttempt { InterviewNodeId = "greeting", SimulatedMinute = 7, OpeningCompleted = false };
-
-        CcsStore.ApplyDialogueChoice(attempt, definition, "ask_reason", DateTime.UtcNow);
-
-        Assert.Equal("done", attempt.InterviewNodeId);
-        Assert.Equal(["ask_reason"], attempt.InterviewChoiceIds);
-        Assert.Equal(7, attempt.SimulatedMinute);
-        Assert.True(attempt.OpeningCompleted);
-        Assert.Contains(attempt.Actions, value => value.Type == "dialogue_choice" && value.Code == "ask_reason");
-        Assert.Throws<InvalidOperationException>(() => CcsStore.ApplyDialogueChoice(attempt, definition, "ask_reason", DateTime.UtcNow));
-    }
-
-    [Fact]
-    public void LegacyCaseGetsInterviewFromExistingChartNarrative()
-    {
-        var definition = ValidImport().Cases[0];
-        definition.InitialInterview = new();
-        definition.InitialChart.HistorySections =
-        [
-            new() { Code = "hpi", Title = "History of present illness", Text = "The symptoms began this morning." },
-            new() { Code = "medications", Title = "Medications", Text = "I take no regular medicines." }
-        ];
-
-        var interview = CcsStore.EffectiveInterview(definition);
-        var attempt = new CcsAttempt { InterviewNodeId = interview.StartNodeId, OpeningCompleted = false };
-
-        Assert.Equal("opening", interview.StartNodeId);
-        Assert.Equal(5, interview.Nodes.Count);
-        CcsStore.ApplyDialogueChoice(attempt, definition, "ask_reason", DateTime.UtcNow);
-        CcsStore.ApplyDialogueChoice(attempt, definition, "ask_history_1", DateTime.UtcNow);
-        CcsStore.ApplyDialogueChoice(attempt, definition, "ask_history_2", DateTime.UtcNow);
-        CcsStore.ApplyDialogueChoice(attempt, definition, "finish_interview", DateTime.UtcNow);
-        Assert.Equal("complete", attempt.InterviewNodeId);
-        Assert.True(attempt.OpeningCompleted);
-    }
-
-    [Fact]
-    public void AuthoredInterviewRemainsPreferredOverGeneratedFallback()
-    {
-        var definition = ValidImport().Cases[0];
-        definition.InitialInterview = ValidInterview();
-
-        Assert.Same(definition.InitialInterview, CcsStore.EffectiveInterview(definition));
-    }
-
-    [Fact]
-    public void TopicInterviewBranchesAndUnlocksFinishAfterRequiredTopics()
-    {
-        var definition = ValidImport().Cases[0];
-        definition.InitialInterview = TopicInterview();
-        var attempt = new CcsAttempt { InterviewNodeId = "opening", OpeningCompleted = false };
-
-        var opening = CcsStore.CurrentInterviewNode(attempt, definition)!;
-        Assert.True(opening.SuppressPatientText);
-        Assert.Equal(["chief_concern"], opening.Choices.Select(value => value.Id));
-        Assert.Throws<ArgumentException>(() => CcsStore.ApplyDialogueChoice(attempt, definition, "required_history", DateTime.UtcNow));
-        CcsStore.ApplyDialogueChoice(attempt, definition, "chief_concern", DateTime.UtcNow);
-        var chiefConcern = CcsStore.CurrentInterviewNode(attempt, definition)!;
-        Assert.False(chiefConcern.SuppressPatientText);
-        Assert.Equal("I feel tired.", chiefConcern.PatientText);
-        Assert.Equal(["required_history", "optional_history"], chiefConcern.Choices.Select(value => value.Id));
-        Assert.Throws<ArgumentException>(() => CcsStore.ApplyDialogueChoice(attempt, definition, "finish_interview", DateTime.UtcNow));
-
-        CcsStore.ApplyDialogueChoice(attempt, definition, "required_history", DateTime.UtcNow);
-        var finishable = CcsStore.CurrentInterviewNode(attempt, definition)!;
-        Assert.Contains(finishable.Choices, value => value.Id == "finish_interview");
-        Assert.DoesNotContain(finishable.Choices, value => value.Id == "chief_concern");
-        Assert.Throws<ArgumentException>(() => CcsStore.ApplyDialogueChoice(attempt, definition, "chief_concern", DateTime.UtcNow));
-        CcsStore.ApplyDialogueChoice(attempt, definition, "finish_interview", DateTime.UtcNow);
-        Assert.True(attempt.OpeningCompleted);
-        Assert.True(CcsStore.CurrentInterviewNode(attempt, definition)!.IsTerminal);
-    }
-
-    [Fact]
-    public void TopicInterviewRepairsLegacyOpeningCompletionFlag()
-    {
-        var definition = ValidImport().Cases[0];
-        definition.InitialInterview = TopicInterview();
-        var attempt = new CcsAttempt { InterviewNodeId = "opening", OpeningCompleted = true };
-
-        CcsStore.ApplyDialogueChoice(attempt, definition, "chief_concern", DateTime.UtcNow);
-
-        Assert.False(attempt.OpeningCompleted);
-        Assert.Equal("chief_concern", attempt.InterviewNodeId);
-    }
-
-    [Fact]
-    public void TopicInterviewRejectsPrerequisiteCycles()
-    {
-        var request = ValidImport();
-        request.Cases[0].InitialInterview = TopicInterview();
-        request.Cases[0].InitialInterview.Topics[0].PrerequisiteTopicIds = ["required_history"];
-
-        var errors = CcsCaseValidator.ValidateImport(request, new HashSet<string>());
-
-        Assert.Contains(errors, value => value.Contains("prerequisites cannot contain cycles", StringComparison.OrdinalIgnoreCase));
-    }
-
-    [Fact]
-    public void CaseContentComparisonIgnoresRevisionMetadata()
-    {
-        var first = ValidImport().Cases[0];
-        var second = ValidImport().Cases[0];
-        first.Id = "507f1f77bcf86cd799439011";
-        first.Version = 4;
-        first.IsCurrent = false;
-        first.CreatedUtc = DateTime.UtcNow.AddDays(-2);
-        second.InitialChart.SimulatedStartUtc = first.InitialChart.SimulatedStartUtc;
-
-        Assert.Equal(CcsStore.CaseContentDocument(first), CcsStore.CaseContentDocument(second));
-        second.Title = "Changed title";
-        Assert.NotEqual(CcsStore.CaseContentDocument(first), CcsStore.CaseContentDocument(second));
-    }
-
     [Fact]
     public void CcsExpectedScoreUsesSeparateUserAndCaseElo()
     {
@@ -391,33 +201,4 @@ public sealed class CcsCaseTests
             }
         ]
     };
-
-    private static CcsInitialInterview ValidInterview() => new()
-    {
-        StartNodeId = "greeting",
-        Nodes =
-        [
-            new() { Id = "greeting", PatientText = "Hello, doctor.", Choices = [new() { Id = "ask_reason", Text = "What brings you in?", NextNodeId = "done" }] },
-            new() { Id = "done", PatientText = "Thank you.", IsTerminal = true }
-        ]
-    };
-
-    private static CcsInitialInterview TopicInterview() => new()
-    {
-        OpeningPatientText = "Good morning.", ClosingPatientText = "Thank you.", FinishChoiceText = "Finish",
-        Topics =
-        [
-            new() { Id = "chief_concern", ClinicianText = "What brings you in?", PatientText = "I feel tired." },
-            new()
-            {
-                Id = "required_history", ClinicianText = "Tell me more.", PatientText = "It started recently.", Required = true,
-                PrerequisiteTopicIds = ["chief_concern"]
-            },
-            new()
-            {
-                Id = "optional_history", ClinicianText = "Anything else?", PatientText = "No.",
-                PrerequisiteTopicIds = ["chief_concern"]
-            }
-        ]
-    };
 }

api/QuestionsApi.Tests/ChoicePoolTests.cs

@@ -92,33 +92,6 @@ public sealed class ChoicePoolTests
         Assert.Contains("every incorrect choice", QuestionValidator.Validate(request));
     }
 
-    [Theory]
-    [InlineData("prompt")]
-    [InlineData("teaching")]
-    [InlineData("correct")]
-    [InlineData("choices")]
-    public void PublishedQuestionRejectsClonedDistractorFollowups(string duplicate)
-    {
-        var request = BuildRequest(5);
-        var first = request.WrongAnswerFollowups["B"];
-        var second = request.WrongAnswerFollowups["C"];
-        if (duplicate == "prompt") second.Prompt = first.Prompt;
-        if (duplicate == "teaching") second.TeachingPoint = first.TeachingPoint;
-        if (duplicate == "correct") second.Choices.Single(x => x.Id == second.CorrectChoiceId).Text =
-            first.Choices.Single(x => x.Id == first.CorrectChoiceId).Text;
-        if (duplicate == "choices") second.Choices = first.Choices.Select(x => new QuestionChoice { Id=x.Id, Text=x.Text }).ToList();
-
-        Assert.Contains("different", QuestionValidator.Validate(request));
-    }
-
-    [Fact]
-    public void PublishedQuestionRequiresThreeDistractorFollowupChoices()
-    {
-        var request = BuildRequest(5);
-        request.WrongAnswerFollowups["B"].Choices.RemoveAt(2);
-        Assert.Contains("exactly three", QuestionValidator.Validate(request));
-    }
-
     [Fact]
     public void OptionalReviewFollowupsRequireValidAuthoredContent()
     {
@@ -302,15 +275,14 @@ public sealed class ChoicePoolTests
                 id => id,
                 id => new WrongAnswerFollowup
                 {
-                    Prompt = $"Which property of Choice {id} makes it less appropriate?",
+                    Prompt = "Which finding makes this less appropriate?",
                     Choices =
                     [
-                        new QuestionChoice { Id = "A", Text = $"Disqualifying property of Choice {id}" },
-                        new QuestionChoice { Id = "B", Text = $"Plausible property one for Choice {id}" },
-                        new QuestionChoice { Id = "C", Text = $"Plausible property two for Choice {id}" }
+                        new QuestionChoice { Id = "A", Text = "Finding one" },
+                        new QuestionChoice { Id = "B", Text = "Finding two" }
                     ],
                     CorrectChoiceId = "A",
-                    TeachingPoint = $"Choice {id} fails because of its specific disqualifying property."
+                    TeachingPoint = "Teaching point"
                 }),
             ChoiceSelectionPercentages = ids.ToDictionary(id => id, _ => 0),
             Discipline = "Medicine",

api/QuestionsApi.Tests/CreditEconomyTests.cs

@@ -8,60 +8,14 @@ public sealed class CreditEconomyTests
     [Fact]
     public void EarningPolicy_UsesTheAgreedRollingLimit()
     {
-        Assert.Equal(30, CreditEconomy.RollingEarningLimit);
+        Assert.Equal(20, CreditEconomy.RollingEarningLimit);
         Assert.Equal(TimeSpan.FromHours(24), CreditEconomy.EarningWindow);
     }
 
-    [Theory]
-    [InlineData(1, 1)]
-    [InlineData(3, 1)]
-    [InlineData(4, 2)]
-    [InlineData(5, 3)]
-    public void FirstCorrectAwardsScaleWithStoredDifficulty(int difficulty, int expected) =>
-        Assert.Equal(expected, CreditEconomy.FirstCorrectAmount(difficulty));
-
-    [Fact]
-    public void DelayedRecoveryReplacesTheNormalReviewAward()
-    {
-        Assert.Equal(1, CreditEconomy.ReviewAmount(false));
-        Assert.Equal(3, CreditEconomy.ReviewAmount(true));
-    }
-
     [Fact]
     public void CreditStatus_DoesNotExposeUserOrOperationIdentifiers()
     {
         Assert.Null(typeof(CreditStatusResponse).GetProperty(nameof(UserCreditAccount.UserId)));
         Assert.Null(typeof(CreditStatusResponse).GetProperty(nameof(UserCreditAccount.RecentEarnings)));
-        Assert.Null(typeof(CreditStatusResponse).GetProperty(nameof(UserCreditAccount.Purchases)));
-        Assert.Null(typeof(CreditStatusResponse).GetProperty(nameof(UserCreditAccount.AppliedOperations)));
-    }
-
-    [Fact]
-    public void PublicLedgerEntry_DoesNotExposeUserOrOperationIdentifiers()
-    {
-        Assert.Null(typeof(CreditLedgerEntryResponse).GetProperty(nameof(CreditLedgerEntry.UserId)));
-        Assert.Null(typeof(CreditLedgerEntryResponse).GetProperty(nameof(CreditLedgerEntry.OperationId)));
-        Assert.Null(typeof(CreditLedgerEntryResponse).GetProperty(nameof(CreditLedgerEntry.SourceId)));
-    }
-
-    [Fact]
-    public void CatalogHasStableCoinOnlyUtilityPrices()
-    {
-        var exam = CreditEconomy.FindProduct(CreditEconomy.ExamTokenSku);
-        var reset = CreditEconomy.FindProduct(CreditEconomy.QBankResetTokenSku);
-
-        Assert.NotNull(exam);
-        Assert.Equal(100, exam.CoinPrice);
-        Assert.Equal(RzStoreGrant.ExamToken, exam.Grant);
-        Assert.NotNull(reset);
-        Assert.Equal(300, reset.CoinPrice);
-        Assert.Equal(RzStoreGrant.QBankResetToken, reset.Grant);
-        Assert.Equal(2, CreditEconomy.Products.Count);
-    }
-
-    [Fact]
-    public void UnknownSkuIsRejectedByCatalog()
-    {
-        Assert.Null(CreditEconomy.FindProduct("cash_purchase"));
     }
 }

api/QuestionsApi.Tests/DailyMissionPolicyTests.cs

@@ -1,78 +0,0 @@
-using QuestionsApi.Models;
-using QuestionsApi.Services;
-using Xunit;
-
-namespace QuestionsApi.Tests;
-
-public sealed class DailyMissionPolicyTests
-{
-    private static readonly DateTime Now = new(2026, 8, 1, 12, 0, 0, DateTimeKind.Utc);
-
-    [Fact]
-    public void DueReviewsArePrioritizedAndCappedAtTen()
-    {
-        var candidates = DailyMissionStore.BuildCandidates(Dashboard(17), Questions(), Now);
-        Assert.Equal(DailyMissionTypes.DueReviews, candidates[0].Type);
-        Assert.Equal(10, candidates[0].Target);
-    }
-
-    [Fact]
-    public void NoReviewsFallsBackToCoverageGaps()
-    {
-        var candidates = DailyMissionStore.BuildCandidates(Dashboard(0), Questions(), Now);
-        Assert.DoesNotContain(candidates, value => value.Type == DailyMissionTypes.DueReviews);
-        Assert.True(candidates.Count >= 3);
-        Assert.Contains(candidates.Take(3), value => value.Type == DailyMissionTypes.DifficultyFourCorrect);
-        Assert.All(candidates.Where(value => value.Type == DailyMissionTypes.WeakSystemCorrect),
-            value => Assert.Equal(3, value.Target));
-    }
-
-    [Fact]
-    public void HardMissionRequiresThreeEligiblePublishedQuestions()
-    {
-        var questions = Questions();
-        questions.RemoveAll(value => value.Step3System == Step3SystemCatalog.All[1] && value.Difficulty >= 4);
-        var candidates = DailyMissionStore.BuildCandidates(Dashboard(0), questions, Now);
-        Assert.DoesNotContain(candidates, value => value.Type == DailyMissionTypes.DifficultyFourCorrect
-            && value.Step3System == Step3SystemCatalog.All[1]);
-    }
-
-    [Fact]
-    public void QuestionProgressRequiresCorrectEligibleActivityAfterMissionStart()
-    {
-        var system = Step3SystemCatalog.All[0];
-        var mission = new DailyMission
-        {
-            Type = DailyMissionTypes.DifficultyFourCorrect, Step3System = system, StartsUtc = Now
-        };
-        var question = new Question { Step3System = system, Difficulty = 4 };
-        Assert.True(DailyMissionStore.QualifiesQuestion(mission,
-            new QuestionAttempt { IsCorrect = true, CreatedUtc = Now }, question));
-        Assert.False(DailyMissionStore.QualifiesQuestion(mission,
-            new QuestionAttempt { IsCorrect = false, CreatedUtc = Now }, question));
-        Assert.False(DailyMissionStore.QualifiesQuestion(mission,
-            new QuestionAttempt { IsCorrect = true, IsSkip = true, CreatedUtc = Now }, question));
-        Assert.False(DailyMissionStore.QualifiesQuestion(mission,
-            new QuestionAttempt { IsCorrect = true, CreatedUtc = Now.AddSeconds(-1) }, question));
-        question.Difficulty = 3;
-        Assert.False(DailyMissionStore.QualifiesQuestion(mission,
-            new QuestionAttempt { IsCorrect = true, CreatedUtc = Now }, question));
-    }
-
-    private static DashboardResponse Dashboard(int pending) => new()
-    {
-        MissedQuestionCount = pending,
-        Systems = Step3SystemCatalog.All.Take(4).Select((system, index) => new DashboardSystemPerformance
-        {
-            System = system, MasteryState = index == 0 ? MasteryStates.Unseen : MasteryStates.Learning,
-            MasteryScore = index * 10, DistinctQuestions = index, Difficulty4PlusSuccessful = index
-        }).ToList()
-    };
-
-    private static List<Question> Questions() => Step3SystemCatalog.All.Take(4)
-        .SelectMany(system => Enumerable.Range(0, 6).Select(index => new Question
-        {
-            ExternalId = $"{system}-{index}", Step3System = system, Difficulty = index < 3 ? 4 : 2,
-            IsPublished = true
-        })).ToList();
-}

api/QuestionsApi.Tests/DashboardTests.cs

@@ -72,9 +72,6 @@ public sealed class DashboardTests
     [InlineData("Pregnancy", "Pregnancy/Childbirth & Female Reproductive System & Breast")]
     [InlineData("Biostatistics", "Biostatistics & Epidemiology/Population Health & Interpretation of the Medical Literature")]
     [InlineData("Medical Ethics", "Social Sciences: Communication Skills/Ethics/Patient Safety")]
-    [InlineData("Integumentary System", "Skin & Subcutaneous Tissue")]
-    [InlineData("Eye & Adnexa", "Nervous System & Special Senses")]
-    [InlineData("Toxicology", "Immune System, Blood & Lymphoreticular System, and Multisystem Processes/Disorders")]
     public void SystemAliasesMapToOfficialCategories(string source, string expected)
     {
         Assert.Equal(expected, DashboardStore.NormalizeStep3System(source));

api/QuestionsApi.Tests/ExamSimulationTests.cs

@@ -44,104 +44,8 @@ public sealed class ExamSimulationTests
         Assert.Equal(0, failing.Correct);
     }
 
-    [Theory]
-    [InlineData(0, 50)]
-    [InlineData(20, 100)]
-    [InlineData(60, 200)]
-    [InlineData(100, 300)]
-    public void NeutralDifficultyUsesTransparentScoreAnchors(int correctCount, int expectedScore)
-    {
-        var items = BuildItems(100);
-        var questions = BuildQuestions(100);
-        var responses = items.Take(correctCount).ToDictionary(
-            item => item.QuestionExternalId,
-            item => new ExamSimulationResponse { QuestionExternalId = item.QuestionExternalId, ChoiceId = "A" });
-
-        var score = ExamSimulationScoring.Calculate(items, responses, questions);
-
-        Assert.Equal(expectedScore, score.PredictedScore);
-        Assert.Equal(correctCount / 100.0, score.RawAccuracy, 4);
-        Assert.Equal(correctCount / 100.0, score.DifficultyAdjustedAccuracy, 4);
-    }
-
     [Fact]
-    public void CorrectHarderQuestionsProduceAHigherAdjustedPrediction()
-    {
-        var questions = BuildQuestions(10);
-        var hardCorrect = BuildItems(10);
-        var easyCorrect = BuildItems(10);
-        for (var index = 0; index < 10; index++)
-        {
-            hardCorrect[index].QuestionDifficulty = index < 5 ? 5 : 1;
-            easyCorrect[index].QuestionDifficulty = index < 5 ? 1 : 5;
-        }
-        var responses = hardCorrect.Take(5).ToDictionary(
-            item => item.QuestionExternalId,
-            item => new ExamSimulationResponse { QuestionExternalId = item.QuestionExternalId, ChoiceId = "A" });
-
-        var hardScore = ExamSimulationScoring.Calculate(hardCorrect, responses, questions);
-        var easyScore = ExamSimulationScoring.Calculate(easyCorrect, responses, questions);
-
-        Assert.Equal(hardScore.RawAccuracy, easyScore.RawAccuracy);
-        Assert.True(hardScore.DifficultyAdjustedAccuracy > easyScore.DifficultyAdjustedAccuracy);
-        Assert.True(hardScore.PredictedScore > easyScore.PredictedScore);
-    }
-
-    [Fact]
-    public void EmpiricalQuestionEloDoesNotAffectPrediction()
-    {
-        var questions = BuildQuestions(20);
-        var lowElos = BuildItems(20);
-        var highElos = BuildItems(20);
-        foreach (var item in lowElos) item.QuestionElo = 100;
-        foreach (var item in highElos) item.QuestionElo = 1900;
-        var responses = lowElos.Take(10).ToDictionary(
-            item => item.QuestionExternalId,
-            item => new ExamSimulationResponse { QuestionExternalId = item.QuestionExternalId, ChoiceId = "A" });
-
-        var lowEloScore = ExamSimulationScoring.Calculate(lowElos, responses, questions);
-        var highEloScore = ExamSimulationScoring.Calculate(highElos, responses, questions);
-
-        Assert.Equal(lowEloScore.PredictedScore, highEloScore.PredictedScore);
-        Assert.Equal(lowEloScore.PassProbability, highEloScore.PassProbability);
-    }
-
-    [Fact]
-    public void SkippedAndUnansweredQuestionsCountAsIncorrect()
-    {
-        var items = BuildItems(10);
-        var questions = BuildQuestions(10);
-        var responses = new Dictionary<string, ExamSimulationResponse>
-        {
-            [items[0].QuestionExternalId] = new() { QuestionExternalId = items[0].QuestionExternalId, ChoiceId = "A" },
-            [items[1].QuestionExternalId] = new() { QuestionExternalId = items[1].QuestionExternalId, ChoiceId = "" }
-        };
-
-        var score = ExamSimulationScoring.Calculate(items, responses, questions);
-
-        Assert.Equal(1, score.Correct);
-        Assert.Equal(10, score.Total);
-        Assert.Equal(0.1, score.RawAccuracy, 4);
-    }
-
-    [Fact]
-    public void LowAccuracyFullLengthSimulationIsNotInflated()
-    {
-        var items = BuildItems(232);
-        var questions = BuildQuestions(232);
-        var responses = items.Take(49).ToDictionary(
-            item => item.QuestionExternalId,
-            item => new ExamSimulationResponse { QuestionExternalId = item.QuestionExternalId, ChoiceId = "A" });
-
-        var score = ExamSimulationScoring.Calculate(items, responses, questions);
-
-        Assert.Equal(103, score.PredictedScore);
-        Assert.True(score.PassProbability < 0.001);
-        Assert.True(score.RangeHigh < 130);
-    }
-
-    [Fact]
-    public void SeenItemsAreReportedButDoNotChangeScoring()
+    public void SeenItemsAreReportedAndCarryLessScoringWeight()
     {
         var questions = BuildQuestions(20);
         var unseen = BuildItems(20);
@@ -155,9 +59,7 @@ public sealed class ExamSimulationTests
 
         Assert.Equal(0, unseenScore.SeenCount);
         Assert.Equal(20, seenScore.SeenCount);
-        Assert.Equal(unseenScore.PredictedScore, seenScore.PredictedScore);
-        Assert.Null(unseenScore.AbilityElo);
-        Assert.Null(seenScore.AbilityElo);
+        Assert.True(unseenScore.AbilityElo > seenScore.AbilityElo);
     }
 
     [Theory]
@@ -209,64 +111,11 @@ public sealed class ExamSimulationTests
         Assert.False(ExamSimulationStore.TryDecodeHistoryCursor("not-a-cursor", out _));
     }
 
-    [Theory]
-    [InlineData(ExamSimulationStates.BetweenBlocks, true)]
-    [InlineData(ExamSimulationStates.Completed, true)]
-    [InlineData(ExamSimulationStates.BlockActive, false)]
-    [InlineData(ExamSimulationStates.Abandoned, false)]
-    public void RepeatedBlockSubmissionIsIdempotentOnlyAfterSubmission(string state, bool expected)
-    {
-        Assert.Equal(expected, ExamSimulationStore.IsAlreadySubmittedState(state));
-    }
-
-    [Fact]
-    public void SubmittedSimulationResponsesAreLocked()
-    {
-        Assert.True(ExamSimulationStore.IsResponseLocked(
-            new ExamSimulationResponse { ChoiceId = "A", IsSubmitted = true }));
-        Assert.False(ExamSimulationStore.IsResponseLocked(
-            new ExamSimulationResponse { ChoiceId = "A", IsSubmitted = false }));
-        Assert.True(ExamSimulationStore.IsResponseLocked(
-            new ExamSimulationResponse { ChoiceId = "A", IsSubmitted = null }));
-        Assert.False(ExamSimulationStore.IsResponseLocked(
-            new ExamSimulationResponse { ChoiceId = "", IsSubmitted = null }));
-    }
-
-    [Fact]
-    public void SubmittedResponseRetriesMustPreserveAnswerContent()
-    {
-        var response = new ExamSimulationResponse
-        {
-            ChoiceId = "B",
-            EliminatedChoiceIds = ["A"],
-            Flagged = true,
-            IsSubmitted = true
-        };
-        var same = new SaveSimulationResponseRequest
-        {
-            ChoiceId = "B",
-            EliminatedChoiceIds = ["A"],
-            Flagged = true,
-            IsSubmitted = true
-        };
-        var changed = new SaveSimulationResponseRequest
-        {
-            ChoiceId = "C",
-            EliminatedChoiceIds = ["A"],
-            Flagged = true,
-            IsSubmitted = true
-        };
-
-        Assert.True(ExamSimulationStore.ResponseContentMatches(response, same, ["A", "B", "C"]));
-        Assert.False(ExamSimulationStore.ResponseContentMatches(response, changed, ["A", "B", "C"]));
-    }
-
     private static List<ExamSimulationItem> BuildItems(int count, bool wasSeen = false) =>
         Enumerable.Range(0, count).Select(index => new ExamSimulationItem
         {
             QuestionExternalId = $"question-{index}",
             QuestionElo = 1000,
-            QuestionDifficulty = 3,
             WasSeen = wasSeen,
             BlueprintCategory = "Cardiovascular"
         }).ToList();
@@ -274,5 +123,5 @@ public sealed class ExamSimulationTests
     private static Dictionary<string, Question> BuildQuestions(int count) =>
         Enumerable.Range(0, count).ToDictionary(
             index => $"question-{index}",
-            index => new Question { ExternalId = $"question-{index}", CorrectChoiceId = "A", Difficulty = 3 });
+            index => new Question { ExternalId = $"question-{index}", CorrectChoiceId = "A" });
 }

api/QuestionsApi.Tests/MasteryCalculatorTests.cs

@@ -1,86 +0,0 @@
-using QuestionsApi.Models;
-using QuestionsApi.Services;
-using Xunit;
-
-namespace QuestionsApi.Tests;
-
-public sealed class MasteryCalculatorTests
-{
-    private static readonly DateTime Now = new(2026, 7, 31, 12, 0, 0, DateTimeKind.Utc);
-
-    [Fact]
-    public void NoEvidenceIsUnseen()
-    {
-        var result = MasteryCalculator.Calculate([], [], [], new Dictionary<string, Question>(), Now);
-        Assert.All(result, item => Assert.Equal(MasteryStates.Unseen, item.MasteryState));
-    }
-
-    [Fact]
-    public void EvidenceGatesStrongAndMasteredStates()
-    {
-        var questions = Enumerable.Range(0, 25).ToDictionary(
-            index => $"q{index}",
-            index => Question($"q{index}", index < 5 ? 4 : 3));
-        var attempts = questions.Keys.Select(id => Attempt(id, true, 0, Now.AddDays(-1))).ToList();
-        var strong = MasteryCalculator.Calculate(attempts.Take(15), [], [], questions, Now)[6];
-        var mastered = MasteryCalculator.Calculate(attempts, [], [], questions, Now)[6];
-        Assert.Equal(MasteryStates.Strong, strong.MasteryState);
-        Assert.Equal(MasteryStates.Mastered, mastered.MasteryState);
-    }
-
-    [Fact]
-    public void PendingReviewBlocksMasteredAndBecomesRecommendedAction()
-    {
-        var questions = Enumerable.Range(0, 25).ToDictionary(
-            index => $"q{index}", index => Question($"q{index}", index < 5 ? 4 : 3));
-        var attempts = questions.Keys.Select(id => Attempt(id, true, 0, Now)).ToList();
-        var queue = new[] { new ReviewQueueItem { QuestionExternalId = "q0", State = ReviewQueueStates.Pending } };
-        var result = MasteryCalculator.Calculate(attempts, [], queue, questions, Now)[6];
-        Assert.Equal(MasteryStates.Strong, result.MasteryState);
-        Assert.Equal("review", result.RecommendedAction.Type);
-    }
-
-    [Fact]
-    public void DelayedReviewReceivesPartialRecoveryAndOldReviewDoesNotRecoverNewCycle()
-    {
-        var questions = new Dictionary<string, Question> { ["q"] = Question("q", 3) };
-        var first = Attempt("q", false, 0, Now.AddDays(-10));
-        var second = Attempt("q", false, 1, Now.AddDays(-2));
-        var reviews = new[]
-        {
-            new QuestionReviewAttempt { QuestionExternalId = "q", IsCorrect = true, CreatedUtc = Now.AddDays(-8) }
-        };
-        var result = MasteryCalculator.Calculate([first, second], reviews, [], questions, Now)[6];
-        Assert.Equal(25, result.MasteryScore);
-    }
-
-    [Fact]
-    public void StrongMasteryIsMarkedDueWithoutDecayingState()
-    {
-        var questions = Enumerable.Range(0, 15).ToDictionary(index => $"q{index}", index => Question($"q{index}", 4));
-        var attempts = questions.Keys.Select(id => Attempt(id, true, 0, Now.AddDays(-31))).ToList();
-        var result = MasteryCalculator.Calculate(attempts, [], [], questions, Now)[6];
-        Assert.Equal(MasteryStates.Strong, result.MasteryState);
-        Assert.True(result.RefreshDue);
-    }
-
-    [Fact]
-    public void SkipsDoNotCountAsEvidence()
-    {
-        var questions = new Dictionary<string, Question> { ["q"] = Question("q", 5) };
-        var skip = Attempt("q", false, 0, Now);
-        skip.IsSkip = true;
-        var result = MasteryCalculator.Calculate([skip], [], [], questions, Now)[6];
-        Assert.Equal(MasteryStates.Unseen, result.MasteryState);
-    }
-
-    private static Question Question(string id, int difficulty) => new()
-    {
-        ExternalId = id, System = "Cardiovascular System", Step3System = "Cardiovascular System", Difficulty = difficulty
-    };
-
-    private static QuestionAttempt Attempt(string id, bool correct, int cycle, DateTime created) => new()
-    {
-        QuestionExternalId = id, UserId = "user", IsCorrect = correct, BankCycle = cycle, CreatedUtc = created
-    };
-}

api/QuestionsApi.Tests/ProgressionPolicyTests.cs

@@ -1,57 +0,0 @@
-using QuestionsApi.Models;
-using QuestionsApi.Services;
-using Xunit;
-
-namespace QuestionsApi.Tests;
-
-public sealed class ProgressionPolicyTests
-{
-    [Fact]
-    public void New_learner_starts_as_case_scout_three()
-    {
-        Assert.Equal(0, ProgressionPolicy.Qualified([], 0));
-        Assert.Equal("Case Scout", ProgressionPolicy.Name(0));
-        Assert.Equal("III", ProgressionPolicy.Division(0));
-    }
-
-    [Fact]
-    public void Pattern_hunter_requires_every_visible_gate()
-    {
-        var systems = Systems(learning: 6, practicing: 2, strong: 0, mastered: 0, hard: 6);
-        Assert.Equal(1, ProgressionPolicy.Qualified(systems, 0));
-        Assert.Equal(3, ProgressionPolicy.Qualified(systems, 1));
-        Assert.Equal("Pattern Hunter", ProgressionPolicy.Name(3));
-        Assert.Equal("III", ProgressionPolicy.Division(3));
-    }
-
-    [Fact]
-    public void Highest_division_requires_breadth_challenge_and_retention()
-    {
-        var systems = Systems(learning: 14, practicing: 14, strong: 14, mastered: 12, hard: 105);
-        Assert.Equal(13, ProgressionPolicy.Qualified(systems, 20));
-        Assert.Equal(14, ProgressionPolicy.Qualified(systems, 21));
-        Assert.Equal("Clinical Vanguard", ProgressionPolicy.Name(14));
-        Assert.Equal("I", ProgressionPolicy.Division(14));
-    }
-
-    [Theory]
-    [InlineData("unseen", 0)] [InlineData("learning", 1)] [InlineData("practicing", 2)]
-    [InlineData("strong", 3)] [InlineData("mastered", 4)]
-    public void Mastery_states_have_stable_order(string state, int expected) =>
-        Assert.Equal(expected, ProgressionPolicy.State(state));
-
-    private static List<DashboardSystemPerformance> Systems(int learning, int practicing, int strong, int mastered, int hard)
-    {
-        var result = new List<DashboardSystemPerformance>();
-        for (var i = 0; i < 14; i++)
-        {
-            var state = i < mastered ? MasteryStates.Mastered
-                : i < strong ? MasteryStates.Strong
-                : i < practicing ? MasteryStates.Practicing
-                : i < learning ? MasteryStates.Learning : MasteryStates.Unseen;
-            result.Add(new DashboardSystemPerformance { System = $"s{i}", MasteryState = state });
-        }
-        for (var i = 0; i < hard; i++) result[i % result.Count].Difficulty4PlusSuccessful++;
-        return result;
-    }
-}

api/QuestionsApi.Tests/QuestionStoreTests.cs

@@ -46,15 +46,4 @@ public sealed class QuestionStoreTests
         Assert.Equal("Reported by student", question.FlagReason);
         Assert.Equal("user-42", question.FlaggedByUserId);
     }
-
-    [Fact]
-    public void StudentResponseIncludesCanonicalStep3SystemForLegacyQuestion()
-    {
-        var response = QuestionResponse.FromModel(new Question
-        {
-            ExternalId = "legacy", System = "Pulmonary", Discipline = "Medicine"
-        });
-
-        Assert.Equal("Respiratory System", response.Step3System);
-    }
 }

api/QuestionsApi.Tests/WeeklyGoalPolicyTests.cs

@@ -1,51 +0,0 @@
-using QuestionsApi.Models;
-using QuestionsApi.Services;
-using Xunit;
-
-namespace QuestionsApi.Tests;
-
-public sealed class WeeklyGoalPolicyTests
-{
-    [Theory]
-    [InlineData("2026-08-03", "2026-08-03")]
-    [InlineData("2026-08-09", "2026-08-03")]
-    [InlineData("2026-08-10", "2026-08-10")]
-    public void WeekStartsOnMondayUtc(string value, string expected) =>
-        Assert.Equal(DateTime.Parse(expected).Date, WeeklyGoalStore.WeekStart(DateTime.Parse(value)));
-
-    [Fact]
-    public void ActiveDaysAreDistinctUtcDates()
-    {
-        var values = new[]
-        {
-            new DateTime(2026, 8, 3, 1, 0, 0, DateTimeKind.Utc),
-            new DateTime(2026, 8, 3, 22, 0, 0, DateTimeKind.Utc),
-            new DateTime(2026, 8, 4, 1, 0, 0, DateTimeKind.Utc)
-        };
-        Assert.Equal(2, WeeklyGoalStore.CountActiveDays(values));
-    }
-
-    [Theory]
-    [InlineData(0, WeeklyRemediationTypes.HardCorrect, 5)]
-    [InlineData(4, WeeklyRemediationTypes.HardCorrect, 5)]
-    [InlineData(5, WeeklyRemediationTypes.Reviews, 5)]
-    [InlineData(25, WeeklyRemediationTypes.Reviews, 15)]
-    public void RemediationIsFeasibleAndCapped(int available, string type, int target) =>
-        Assert.Equal((type, target), WeeklyGoalStore.ChooseRemediation(available));
-
-    [Fact]
-    public void HardProgressRequiresCorrectEligibleDifficultyFourAttempt()
-    {
-        var system = Step3SystemCatalog.All[0];
-        var start = new DateTime(2026, 8, 3, 0, 0, 0, DateTimeKind.Utc);
-        var goal = new WeeklyGoal { WeekStartUtc = start, ExpiresUtc = start.AddDays(7), EligibleSystems = [system] };
-        var attempt = new QuestionAttempt { IsCorrect = true, CreatedUtc = start.AddDays(1) };
-        var question = new Question { Step3System = system, Difficulty = 4 };
-        Assert.True(WeeklyGoalStore.QualifiesHardAttempt(goal, attempt, question));
-        attempt.IsCorrect = false;
-        Assert.False(WeeklyGoalStore.QualifiesHardAttempt(goal, attempt, question));
-        attempt.IsCorrect = true;
-        question.Difficulty = 3;
-        Assert.False(WeeklyGoalStore.QualifiesHardAttempt(goal, attempt, question));
-    }
-}

api/QuestionsApi/Controllers/CreditsController.cs

@@ -1,7 +1,6 @@
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using QuestionsApi.Services;
-using QuestionsApi.Models;
 using System.Security.Claims;
 
 namespace QuestionsApi.Controllers;
@@ -9,84 +8,13 @@ namespace QuestionsApi.Controllers;
 [ApiController]
 [Route("api/credits")]
 [Authorize(Roles = "USER,SUPER")]
-public sealed class CreditsController(CreditStore credits, ExamSimulationStore simulations) : ControllerBase
+public sealed class CreditsController(CreditStore credits) : ControllerBase
 {
     [HttpGet]
     public async Task<IActionResult> Get() => Ok(await credits.GetStatusAsync(UserId()));
 
-    [HttpGet("ledger")]
-    public async Task<IActionResult> Ledger([FromQuery] int limit = 20, [FromQuery] string? before = null)
-    {
-        DateTime? cursor = null;
-        if (!string.IsNullOrWhiteSpace(before))
-        {
-            if (!DateTime.TryParse(before, null, System.Globalization.DateTimeStyles.RoundtripKind, out var parsed))
-                return BadRequest(new { code = "invalid_cursor", message = "The ledger cursor is invalid." });
-            cursor = parsed;
-        }
-        return Ok(await credits.GetLedgerAsync(UserId(), limit, cursor));
-    }
-
-    [HttpPost("purchases")]
-    public async Task<IActionResult> Purchase([FromBody] CreditPurchaseRequest request)
-    {
-        var product = CreditEconomy.FindProduct(request.Sku);
-        if (product is null) return BadRequest(new { code = "unknown_sku", message = "Unknown store product." });
-        if (!ValidOperationId(request.OperationId))
-            return BadRequest(new { code = "invalid_operation_id", message = "A valid operation ID is required." });
-        var result = await credits.PurchaseAsync(UserId(), product, request.OperationId);
-        return result.Result switch
-        {
-            CreditOperationResult.Succeeded => Ok(result.Status),
-            CreditOperationResult.InsufficientCredits => Conflict(new
-                { code = "insufficient_coins", message = "Not enough Rz Coins.", credits = result.Status }),
-            _ => Conflict(new
-                { code = "operation_conflict", message = "That operation ID was already used.", credits = result.Status })
-        };
-    }
-
-    [HttpPost("qbank-reset")]
-    public async Task<IActionResult> ResetQBank([FromBody] QBankResetRequest request)
-    {
-        if (request.Confirmation != "RESET_QBANK")
-            return BadRequest(new { code = "confirmation_required", message = "Enter RESET_QBANK to confirm." });
-        if (!ValidOperationId(request.OperationId))
-            return BadRequest(new { code = "invalid_operation_id", message = "A valid operation ID is required." });
-        if (await simulations.FindActiveAsync(UserId()) is not null)
-            return Conflict(new { code = "active_exam", message = "Finish or end the active exam before resetting the QBank." });
-        var result = await credits.ApplyQBankResetAsync(UserId(), request.OperationId);
-        return result.Result == CreditOperationResult.Succeeded
-            ? Ok(result.Status)
-            : Conflict(new
-                { code = "reset_token_required", message = "A QBank Reset Token is required.", credits = result.Status });
-    }
-
-    [HttpGet("spin-config")]
-    public IActionResult SpinConfig() => Ok(new SpinConfigResponse());
-
-    [HttpPost("spin")]
-    public async Task<IActionResult> Spin([FromBody] SpinRequest request)
-    {
-        if (!ValidOperationId(request.OperationId))
-            return BadRequest(new { code = "invalid_operation_id", message = "A valid operation ID is required." });
-        var result = await credits.SpinAsync(UserId(), request.OperationId);
-        return result.Result switch
-        {
-            CreditOperationResult.Succeeded => Ok(result),
-            CreditOperationResult.InsufficientCredits => Conflict(new
-                { code = "insufficient_coins", message = "Not enough Rz Coins.", credits = result.Status }),
-            CreditOperationResult.RateLimited => Conflict(new
-                { code = "rate_limited", message = "Too many spins - try again later.", credits = result.Status }),
-            _ => Conflict(new
-                { code = "operation_conflict", message = "That operation ID was already used.", credits = result.Status })
-        };
-    }
-
     private string UserId() => User.FindFirstValue(ClaimTypes.NameIdentifier)
         ?? User.FindFirstValue(ClaimTypes.Name)
         ?? User.Identity?.Name
         ?? throw new UnauthorizedAccessException();
-
-    private static bool ValidOperationId(string value) =>
-        !string.IsNullOrWhiteSpace(value) && value.Length <= 100;
 }

api/QuestionsApi/Controllers/DailyMissionsController.cs

@@ -1,36 +0,0 @@
-using Microsoft.AspNetCore.Authorization;
-using Microsoft.AspNetCore.Mvc;
-using QuestionsApi.Services;
-using System.Security.Claims;
-
-namespace QuestionsApi.Controllers;
-
-[ApiController]
-[Route("api/daily-missions")]
-[Authorize(Roles = "USER,SUPER")]
-public sealed class DailyMissionsController(
-    DailyMissionStore missions, DashboardStore dashboard, QuestionStore questions) : ControllerBase
-{
-    [HttpGet]
-    public async Task<IActionResult> Get()
-    {
-        var now = DateTime.UtcNow;
-        return Ok(await missions.GetOrCreateAsync(UserId(), await dashboard.GetAsync(UserId(), now),
-            await questions.GetPublishedAsync()));
-    }
-
-    [HttpPost("{missionId}/replace")]
-    public async Task<IActionResult> Replace(string missionId)
-    {
-        try
-        {
-            var result = await missions.ReplaceAsync(UserId(), missionId);
-            return result is null ? NotFound() : Ok(result);
-        }
-        catch (ArgumentException exception) { return NotFound(exception.Message); }
-        catch (InvalidOperationException exception) { return Conflict(exception.Message); }
-    }
-
-    private string UserId() => User.FindFirstValue(ClaimTypes.NameIdentifier)
-        ?? User.FindFirstValue(ClaimTypes.Name) ?? User.Identity?.Name ?? throw new UnauthorizedAccessException();
-}

api/QuestionsApi/Controllers/DashboardController.cs

@@ -8,7 +8,7 @@ namespace QuestionsApi.Controllers;
 [ApiController]
 [Route("api/dashboard")]
 [Authorize(Roles = "USER,SUPER")]
-public sealed class DashboardController(DashboardStore dashboard, ProgressionStore progression) : ControllerBase
+public sealed class DashboardController(DashboardStore dashboard) : ControllerBase
 {
     [HttpGet]
     public async Task<IActionResult> Get()
@@ -18,8 +18,6 @@ public sealed class DashboardController(DashboardStore dashboard, ProgressionSto
             ?? User.Identity?.Name
             ?? "";
         if (string.IsNullOrWhiteSpace(userId)) return Unauthorized();
-        var response = await dashboard.GetAsync(userId, DateTime.UtcNow);
-        response.Progression = await progression.GetAsync(userId);
-        return Ok(response);
+        return Ok(await dashboard.GetAsync(userId, DateTime.UtcNow));
     }
 }

api/QuestionsApi/Controllers/ExamSimulationsController.cs

@@ -9,12 +9,7 @@ namespace QuestionsApi.Controllers;
 [ApiController]
 [Route("api/exam-simulations")]
 [Authorize(Roles = "USER,SUPER")]
-public class ExamSimulationsController(
-    ExamSimulationStore simulations,
-    CreditStore credits,
-    MasteryAwardService masteryAwards,
-    StudySessionStore studySessions,
-    ProgressionStore progression) : ControllerBase
+public class ExamSimulationsController(ExamSimulationStore simulations) : ControllerBase
 {
     [HttpGet("readiness")]
     public async Task<IActionResult> Readiness() => Ok(await simulations.GetReadinessAsync(UserId()));
@@ -22,33 +17,12 @@ public class ExamSimulationsController(
     [HttpPost]
     public async Task<IActionResult> Create()
     {
-        var userId = UserId();
-        if (await simulations.FindActiveAsync(userId) is not null)
-            return Conflict(new { code = "active_exam", message = "An active Step 3 simulation already exists." });
-        var operationId = $"exam-create:{Guid.NewGuid():N}";
-        var bypass = User.IsInRole("SUPER");
-        if (!bypass && !await credits.TryConsumeExamTokenAsync(userId, operationId))
-            return Conflict(new
-            {
-                code = "exam_token_required",
-                message = "An Exam Simulation Token is required.",
-                credits = await credits.GetStatusAsync(userId)
-            });
         try
         {
-            var simulation = await simulations.CreateAsync(userId);
+            var simulation = await simulations.CreateAsync(UserId());
             return Ok(await simulations.ToResponseAsync(simulation));
         }
-        catch (InvalidOperationException exception)
-        {
-            if (!bypass) await credits.RefundExamTokenAsync(userId, operationId);
-            return Conflict(new { code = "exam_creation_failed", message = exception.Message });
-        }
-        catch
-        {
-            if (!bypass) await credits.RefundExamTokenAsync(userId, operationId);
-            throw;
-        }
+        catch (InvalidOperationException exception) { return Conflict(exception.Message); }
     }
 
     [HttpGet("preview-results")]
@@ -118,12 +92,7 @@ public class ExamSimulationsController(
     {
         var simulation = await simulations.GetOwnedAsync(id, UserId());
         if (simulation is null) return NotFound();
-        try
-        {
-            simulation = await simulations.StartNextBlockAsync(simulation);
-            await studySessions.EnsureSimulationBlockAsync(UserId(), simulation.Id ?? id, simulation.CurrentBlock);
-            return Ok(await simulations.ToResponseAsync(simulation));
-        }
+        try { return Ok(await simulations.ToResponseAsync(await simulations.StartNextBlockAsync(simulation))); }
         catch (InvalidOperationException exception) { return Conflict(exception.Message); }
     }
 
@@ -142,36 +111,7 @@ public class ExamSimulationsController(
     {
         var simulation = await simulations.GetOwnedAsync(id, UserId());
         if (simulation is null) return NotFound();
-        try
-        {
-            var userId = UserId();
-            await masteryAwards.PrepareAsync(userId);
-            await progression.PrepareAsync(userId);
-            simulation = await simulations.SubmitBlockAsync(simulation);
-            var response = await simulations.ToResponseAsync(simulation);
-            var session = await studySessions.CompleteSimulationBlockAsync(userId, simulation.Id ?? id, simulation.CurrentBlock);
-            response.StudySessionProgress = session.Progress;
-            response.SessionSummary = session.Summary;
-            if (session.Summary is not null)
-                response.CreditAwards.AddRange(session.Summary.CoinAwards.Where(value =>
-                    value.ReasonCode == CreditReasonCodes.SessionGoalComplete));
-            if (simulation.State == ExamSimulationStates.Completed && !simulation.IsSample)
-            {
-                var result = await credits.AwardAsync(userId, new CreditAwardRequest(
-                    $"simulation:{simulation.Id}", 10, CreditReasonCodes.ExamSimulationComplete,
-                    "Completed a Step 3 exam simulation", "exam_simulation", simulation.Id ?? "", false));
-                if (result.Award is not null) response.CreditAwards.Add(result.Award);
-                response.CreditAwards.AddRange(await masteryAwards.AwardPromotionsAsync(userId));
-                response.Credits = await credits.GetStatusAsync(userId);
-            }
-            else if (session.Summary is not null)
-                response.Credits = await credits.GetStatusAsync(userId);
-            var progressionResult = await progression.RefreshAsync(userId);
-            response.Progression = progressionResult.State;
-            response.CreditAwards.AddRange(progressionResult.Awards);
-            if (progressionResult.Awards.Count > 0) response.Credits = await credits.GetStatusAsync(userId);
-            return Ok(response);
-        }
+        try { return Ok(await simulations.ToResponseAsync(await simulations.SubmitBlockAsync(simulation))); }
         catch (InvalidOperationException exception) { return Conflict(exception.Message); }
     }
 

api/QuestionsApi/Controllers/ProgressionController.cs

@@ -1,18 +0,0 @@
-using Microsoft.AspNetCore.Authorization;
-using Microsoft.AspNetCore.Mvc;
-using QuestionsApi.Services;
-using System.Security.Claims;
-
-namespace QuestionsApi.Controllers;
-
-[ApiController, Route("api/progression"), Authorize(Roles = "USER,SUPER")]
-public sealed class ProgressionController(ProgressionStore progression) : ControllerBase
-{
-    [HttpGet]
-    public async Task<IActionResult> Get()
-    {
-        var userId = User.FindFirstValue(ClaimTypes.NameIdentifier) ?? User.FindFirstValue(ClaimTypes.Name)
-            ?? User.Identity?.Name ?? "";
-        return string.IsNullOrWhiteSpace(userId) ? Unauthorized() : Ok(await progression.GetAsync(userId));
-    }
-}

api/QuestionsApi/Controllers/QuestionsController.cs

@@ -20,10 +20,6 @@ public class QuestionsController : ControllerBase
     private readonly QuestionBookmarkStore _bookmarks;
     private readonly ReviewQueueStore _reviewQueue;
     private readonly CreditStore _credits;
-    private readonly MasteryAwardService _masteryAwards;
-    private readonly StudySessionStore _studySessions;
-    private readonly DailyMissionStore _dailyMissions;
-    private readonly ProgressionStore _progression;
 
     public QuestionsController(
         QuestionStore questions,
@@ -34,11 +30,7 @@ public class QuestionsController : ControllerBase
         ServiceMetrics metrics,
         QuestionBookmarkStore bookmarks,
         ReviewQueueStore reviewQueue,
-        CreditStore credits,
-        MasteryAwardService masteryAwards,
-        StudySessionStore studySessions,
-        DailyMissionStore dailyMissions,
-        ProgressionStore progression)
+        CreditStore credits)
     {
         _questions = questions;
         _attempts = attempts;
@@ -49,10 +41,6 @@ public class QuestionsController : ControllerBase
         _bookmarks = bookmarks;
         _reviewQueue = reviewQueue;
         _credits = credits;
-        _masteryAwards = masteryAwards;
-        _studySessions = studySessions;
-        _dailyMissions = dailyMissions;
-        _progression = progression;
     }
 
     [HttpGet("systems")]
@@ -67,9 +55,7 @@ public class QuestionsController : ControllerBase
     [Authorize(Roles = "USER,SUPER")]
     public async Task<IActionResult> Search([FromBody] QuestionSearchRequest req)
     {
-        List<Question> questions;
-        try { questions = await _questions.SearchAsync(req, User.IsInRole("SUPER")); }
-        catch (ArgumentException exception) { return BadRequest(exception.Message); }
+        var questions = await _questions.SearchAsync(req, User.IsInRole("SUPER"));
         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));
@@ -164,9 +150,6 @@ public class QuestionsController : ControllerBase
         if (string.IsNullOrWhiteSpace(userId))
             return Unauthorized();
 
-        await _masteryAwards.PrepareAsync(userId);
-        await _progression.PrepareAsync(userId);
-
         var record = await _attempts.RecordFirstAttemptAsync(
             question.ExternalId,
             userId,
@@ -174,8 +157,7 @@ public class QuestionsController : ControllerBase
             req.ChoiceId.Trim() == question.CorrectChoiceId,
             false,
             presentedChoiceIds,
-            req.DurationSeconds,
-            await _credits.GetBankCycleAsync(userId));
+            req.DurationSeconds);
         if (record.Inserted)
         {
             _metrics.AttemptCreated();
@@ -193,18 +175,8 @@ public class QuestionsController : ControllerBase
             _metrics.AttemptDuplicate();
         }
         await _reviewQueue.AddFromFirstAttemptAsync(record.Attempt);
-        var creditAwards = new List<CreditAward>();
-        if (record.Inserted && record.Attempt.IsCorrect)
-        {
-            var amount = CreditEconomy.FirstCorrectAmount(question.Difficulty);
-            var difficult = question.Difficulty >= 4;
-            var award = await _credits.AwardAsync(userId, new CreditAwardRequest(
-                $"answer:{record.Attempt.Id}", amount,
-                difficult ? CreditReasonCodes.DifficultCorrect : CreditReasonCodes.FirstCorrect,
-                difficult ? $"Difficulty {question.Difficulty} first correct answer" : "First correct answer",
-                "question_attempt", record.Attempt.Id ?? ""));
-            if (award.Award is not null) creditAwards.Add(award.Award);
-        }
+        if (record.Inserted && record.Attempt.IsCorrect && req.MetTimeLimit)
+            await _credits.AwardForFirstAnswerAsync(userId, record.Attempt.Id ?? "");
 
         var ratingOwner = Guid.NewGuid().ToString("N");
         var shouldRate = await _attempts.TryAcquireRatingLeaseAsync(
@@ -230,19 +202,6 @@ public class QuestionsController : ControllerBase
             throw;
         }
 
-        creditAwards.AddRange(await _masteryAwards.AwardPromotionsAsync(userId));
-        StudySessionEnvelope? studySession = null;
-        if (!string.IsNullOrWhiteSpace(req.StudySessionId))
-            studySession = await _studySessions.RecordQuestionAsync(
-                req.StudySessionId, userId, record.Attempt, question, creditAwards);
-        if (studySession?.Summary is not null)
-            creditAwards.AddRange(studySession.Summary.CoinAwards.Where(value =>
-                value.ReasonCode == CreditReasonCodes.SessionGoalComplete
-                && creditAwards.All(existing => existing.ReasonCode != value.ReasonCode)));
-        var dailyMissions = await _dailyMissions.RecordQuestionAsync(userId, record.Attempt, question);
-        if (dailyMissions is not null) creditAwards.AddRange(dailyMissions.CreditAwards);
-        var progression = await _progression.RefreshAsync(userId);
-        creditAwards.AddRange(progression.Awards);
         return Ok(new FirstQuestionAttemptResponse
         {
             QuestionExternalId = question.ExternalId,
@@ -251,12 +210,7 @@ public class QuestionsController : ControllerBase
                 await _statistics.GetPercentagesForQuestionAsync(question.ExternalId)),
             QuestionElo = rating.QuestionElo,
             Rating = rating,
-            Credits = await _credits.GetStatusAsync(userId),
-            CreditAwards = creditAwards,
-            StudySessionProgress = studySession?.Progress,
-            SessionSummary = studySession?.Summary,
-            DailyMissions = dailyMissions?.State,
-            Progression = progression.State
+            Credits = await _credits.GetStatusAsync(userId)
         });
     }
 
@@ -317,15 +271,12 @@ public class QuestionsController : ControllerBase
         if (string.IsNullOrWhiteSpace(userId))
             return Unauthorized();
 
-        await _progression.PrepareAsync(userId);
-
         var record = await _attempts.RecordFirstAttemptAsync(
             question.ExternalId,
             userId,
             "",
             false,
-            true,
-            bankCycle: await _credits.GetBankCycleAsync(userId));
+            true);
         if (record.Inserted)
             _metrics.AttemptCreated();
         else
@@ -351,7 +302,6 @@ public class QuestionsController : ControllerBase
             throw;
         }
 
-        var progression = await _progression.RefreshAsync(userId);
         return Ok(new SkipQuestionResponse
         {
             QuestionExternalId = question.ExternalId,
@@ -360,8 +310,7 @@ public class QuestionsController : ControllerBase
                 question,
                 await _statistics.GetPercentagesForQuestionAsync(question.ExternalId)),
             QuestionElo = rating.QuestionElo,
-            Rating = rating,
-            Progression = progression.State
+            Rating = rating
         });
     }
 

api/QuestionsApi/Controllers/ReviewQueueController.cs

@@ -14,12 +14,7 @@ public sealed class ReviewQueueController(
     QuestionStore questions,
     AnswerStatisticsStore statistics,
     RatingStore ratings,
-    QuestionBookmarkStore bookmarks,
-    CreditStore credits,
-    MasteryAwardService masteryAwards,
-    StudySessionStore studySessions,
-    DailyMissionStore dailyMissions,
-    ProgressionStore progression) : ControllerBase
+    QuestionBookmarkStore bookmarks) : ControllerBase
 {
     [HttpPost("next")]
     public async Task<IActionResult> Next([FromBody] ReviewQueueNextRequest req)
@@ -27,11 +22,9 @@ public sealed class ReviewQueueController(
         var userId = UserId();
         if (string.IsNullOrWhiteSpace(userId)) return Unauthorized();
         await queue.EnsureUserQueueAsync(userId);
-        ReviewQueueItem? item;
-        try { item = await queue.GetRandomPendingAsync(userId, req.ExcludeExternalIds, req.Step3System); }
-        catch (ArgumentException exception) { return BadRequest(exception.Message); }
+        var item = await queue.GetRandomPendingAsync(userId, req.ExcludeExternalIds);
         if (item is null)
-            return Ok(new ReviewQueueNextResponse { PendingCount = checked((int)await queue.CountPendingAsync(userId, req.Step3System)) });
+            return Ok(new ReviewQueueNextResponse { PendingCount = checked((int)await queue.CountPendingAsync(userId)) });
 
         var question = await questions.GetByExternalIdAsync(item.QuestionExternalId);
         if (question is null || !question.IsPublished) return NotFound();
@@ -46,7 +39,7 @@ public sealed class ReviewQueueController(
         {
             Question = response,
             Cycle = item.Cycle,
-            PendingCount = checked((int)await queue.CountPendingAsync(userId, req.Step3System))
+            PendingCount = checked((int)await queue.CountPendingAsync(userId))
         });
     }
 
@@ -76,8 +69,6 @@ public sealed class ReviewQueueController(
                 return BadRequest("presentedChoiceIds must include valid selected and correct choices");
         }
 
-        await masteryAwards.PrepareAsync(userId);
-        await progression.PrepareAsync(userId);
         var result = await queue.RecordReviewAsync(
             userId,
             req.ClientAttemptId,
@@ -88,44 +79,12 @@ public sealed class ReviewQueueController(
             choiceId == question.CorrectChoiceId,
             req.DurationSeconds);
         if (result is null) return Conflict("review cycle is no longer active");
-        var awards = new List<CreditAward>();
-        var delayed = false;
-        if (result.Attempt.IsCorrect)
-        {
-            delayed = result.Item is not null
-                && result.Attempt.CreatedUtc - result.Item.CreatedUtc >= TimeSpan.FromHours(24);
-            var award = await credits.AwardAsync(userId, new CreditAwardRequest(
-                $"review:{result.Attempt.Id}", CreditEconomy.ReviewAmount(delayed),
-                delayed ? CreditReasonCodes.DelayedRecovery : CreditReasonCodes.ScheduledReview,
-                delayed ? "Delayed recovery of a missed question" : "Correct scheduled review",
-                "question_review", result.Attempt.Id));
-            if (award.Award is not null) awards.Add(award.Award);
-        }
-        awards.AddRange(await masteryAwards.AwardPromotionsAsync(userId));
-        StudySessionEnvelope? studySession = null;
-        if (!string.IsNullOrWhiteSpace(req.StudySessionId))
-            studySession = await studySessions.RecordReviewAsync(
-                req.StudySessionId, userId, result.Attempt, delayed, awards);
-        if (studySession?.Summary is not null)
-            awards.AddRange(studySession.Summary.CoinAwards.Where(value =>
-                value.ReasonCode == CreditReasonCodes.SessionGoalComplete
-                && awards.All(existing => existing.ReasonCode != value.ReasonCode)));
-        var missionResult = await dailyMissions.RecordReviewAsync(userId, result.Attempt);
-        if (missionResult is not null) awards.AddRange(missionResult.CreditAwards);
-        var progressionResult = await progression.RefreshAsync(userId);
-        awards.AddRange(progressionResult.Awards);
         return Ok(new ReviewQueueAttemptResponse
         {
             QuestionExternalId = question.ExternalId,
             IsCorrect = result.Attempt.IsCorrect,
             QueueState = result.Item?.State ?? ReviewQueueStates.Pending,
-            PendingCount = checked((int)await queue.CountPendingAsync(userId)),
-            Credits = await credits.GetStatusAsync(userId),
-            CreditAwards = awards,
-            StudySessionProgress = studySession?.Progress,
-            SessionSummary = studySession?.Summary,
-            DailyMissions = missionResult?.State,
-            Progression = progressionResult.State
+            PendingCount = checked((int)await queue.CountPendingAsync(userId))
         });
     }
 

api/QuestionsApi/Controllers/StudySessionsController.cs

@@ -1,52 +0,0 @@
-using Microsoft.AspNetCore.Authorization;
-using Microsoft.AspNetCore.Mvc;
-using QuestionsApi.Models;
-using QuestionsApi.Services;
-using System.Security.Claims;
-
-namespace QuestionsApi.Controllers;
-
-[ApiController]
-[Route("api/study-sessions")]
-[Authorize(Roles = "USER,SUPER")]
-public sealed class StudySessionsController(StudySessionStore sessions) : ControllerBase
-{
-    [HttpPost]
-    public async Task<IActionResult> Create(CreateStudySessionRequest request)
-    {
-        try { return Ok(sessions.Envelope(await sessions.CreateAsync(UserId(), request))); }
-        catch (ArgumentException exception) { return BadRequest(exception.Message); }
-        catch (InvalidOperationException exception) { return Conflict(exception.Message); }
-    }
-
-    [HttpGet("active")]
-    public async Task<IActionResult> Active()
-    {
-        var session = await sessions.GetActiveAsync(UserId());
-        return session is null ? NoContent() : Ok(sessions.Envelope(session));
-    }
-
-    [HttpPost("{id}/finish")]
-    public async Task<IActionResult> Finish(string id)
-    {
-        var result = await sessions.FinishEarlyAsync(id, UserId());
-        return result is null ? NotFound() : Ok(result);
-    }
-
-    [HttpGet("{id}/summary")]
-    public async Task<IActionResult> Summary(string id)
-    {
-        var session = await sessions.GetOwnedAsync(id, UserId());
-        return session is null ? NotFound() : Ok(sessions.Envelope(session));
-    }
-
-    [HttpPost("{id}/check")]
-    public async Task<IActionResult> Check(string id)
-    {
-        var result = await sessions.CheckAsync(id, UserId());
-        return result is null ? NotFound() : Ok(result);
-    }
-
-    private string UserId() => User.FindFirstValue(ClaimTypes.NameIdentifier)
-        ?? User.FindFirstValue(ClaimTypes.Name) ?? User.Identity?.Name ?? throw new UnauthorizedAccessException();
-}

api/QuestionsApi/Controllers/WeeklyGoalsController.cs

@@ -1,25 +0,0 @@
-using Microsoft.AspNetCore.Authorization;
-using Microsoft.AspNetCore.Mvc;
-using QuestionsApi.Services;
-using System.Security.Claims;
-
-namespace QuestionsApi.Controllers;
-
-[ApiController]
-[Route("api/weekly-goals")]
-[Authorize(Roles = "USER,SUPER")]
-public sealed class WeeklyGoalsController(
-    WeeklyGoalStore goals, DashboardStore dashboard, QuestionStore questions) : ControllerBase
-{
-    [HttpGet]
-    public async Task<IActionResult> Get()
-    {
-        var userId = UserId();
-        var now = DateTime.UtcNow;
-        return Ok(await goals.GetAsync(userId, await dashboard.GetAsync(userId, now),
-            await questions.GetPublishedAsync()));
-    }
-
-    private string UserId() => User.FindFirstValue(ClaimTypes.NameIdentifier)
-        ?? User.FindFirstValue(ClaimTypes.Name) ?? User.Identity?.Name ?? throw new UnauthorizedAccessException();
-}

api/QuestionsApi/Dockerfile

@@ -9,7 +9,6 @@ RUN dotnet restore "api/QuestionsApi/QuestionsApi.csproj"
 
 COPY api/QuestionsApi/ api/QuestionsApi/
 COPY content/dynamic_questions/ content/dynamic_questions/
-COPY content/ccs/ content/ccs/
 WORKDIR /src/api/QuestionsApi
 RUN dotnet publish "QuestionsApi.csproj" -c Release -o /app/publish /p:UseAppHost=false /p:SourceRevisionId=${BUILD_REVISION}
 
@@ -18,7 +17,6 @@ ARG BUILD_REVISION
 WORKDIR /app
 COPY --from=build /app/publish .
 COPY --from=build /src/content/dynamic_questions ./content/dynamic_questions
-COPY --from=build /src/content/ccs ./content/ccs
 
 ENV ASPNETCORE_URLS=http://+:5008 \
     ASPNETCORE_ENVIRONMENT=Production \

api/QuestionsApi/Models/CcsModels.cs

@@ -64,10 +64,7 @@ public class CcsCaseRevision
     public int RealTimeMinutes { get; set; } = 20;
     public int Difficulty { get; set; } = 2;
     public List<string> Tags { get; set; } = [];
-    public string ExperienceMode { get; set; } = CcsExperienceModes.Management;
-    public CcsGraphicalPresentation GraphicalPresentation { get; set; } = new();
     public CcsInitialChart InitialChart { get; set; } = new();
-    public CcsInitialInterview InitialInterview { get; set; } = new();
     public List<string> AllowedLocations { get; set; } = [];
     public List<CcsExamDefinition> Exams { get; set; } = [];
     public List<CcsCaseOrderDefinition> OrderResponses { get; set; } = [];
@@ -77,62 +74,6 @@ public class CcsCaseRevision
     public DateTime CreatedUtc { get; set; } = DateTime.UtcNow;
 }
 
-public class CcsInitialInterview
-{
-    public string StartNodeId { get; set; } = "";
-    public List<CcsDialogueNode> Nodes { get; set; } = [];
-    public string OpeningPatientText { get; set; } = "";
-    public List<CcsInterviewTopic> Topics { get; set; } = [];
-    public string FinishChoiceText { get; set; } = "Finish the interview";
-    public string ClosingPatientText { get; set; } = "Thank you, doctor.";
-    public CcsInterviewDebrief Debrief { get; set; } = new();
-}
-
-public class CcsInterviewTopic
-{
-    public string Id { get; set; } = "";
-    public string ClinicianText { get; set; } = "";
-    public string PatientText { get; set; } = "";
-    public bool Required { get; set; }
-    public List<string> PrerequisiteTopicIds { get; set; } = [];
-}
-
-public class CcsInterviewDebrief
-{
-    public string LikelyDiagnosis { get; set; } = "";
-    public string Summary { get; set; } = "";
-    public List<string> TeachingPoints { get; set; } = [];
-}
-
-public class CcsGraphicalPresentation
-{
-    public string SceneKey { get; set; } = "";
-    public string PatientAssetKey { get; set; } = "";
-    public int InterviewRevision { get; set; }
-}
-
-public static class CcsExperienceModes
-{
-    public const string Management = "management";
-    public const string GraphicalInterview = "graphical_interview";
-}
-
-public class CcsDialogueNode
-{
-    public string Id { get; set; } = "";
-    public string PatientText { get; set; } = "";
-    public bool SuppressPatientText { get; set; }
-    public bool IsTerminal { get; set; }
-    public List<CcsDialogueChoice> Choices { get; set; } = [];
-}
-
-public class CcsDialogueChoice
-{
-    public string Id { get; set; } = "";
-    public string Text { get; set; } = "";
-    public string NextNodeId { get; set; } = "";
-}
-
 public class CcsInitialChart
 {
     public string PatientSummary { get; set; } = "";
@@ -164,8 +105,6 @@ public class CcsCaseOrderDefinition
 {
     public string OrderCode { get; set; } = "";
     public int? TurnaroundMinutes { get; set; }
-    public string PerformanceLocation { get; set; } = "";
-    public bool RequiresPatientVisit { get; set; }
     public string Result { get; set; } = "";
     public string ResultSection { get; set; } = "";
     public Dictionary<string, string> VitalPatches { get; set; } = [];
@@ -209,8 +148,6 @@ public class CcsAttempt
     public int Revision { get; set; }
     public int SimulatedMinute { get; set; }
     [BsonIgnoreIfNull] public bool? OpeningCompleted { get; set; }
-    public string InterviewNodeId { get; set; } = "";
-    public List<string> InterviewChoiceIds { get; set; } = [];
     public string Location { get; set; } = "";
     public Dictionary<string, string> CurrentVitals { get; set; } = [];
     public List<CcsAttemptAction> Actions { get; set; } = [];
@@ -245,8 +182,6 @@ public class CcsPendingResult
     public string Category { get; set; } = "";
     public string Title { get; set; } = "";
     public int DueMinute { get; set; }
-    public string PerformanceLocation { get; set; } = "";
-    public bool RequiresPatientVisit { get; set; }
     public string Result { get; set; } = "";
     public Dictionary<string, string> VitalPatches { get; set; } = [];
 }
@@ -275,22 +210,10 @@ public class CcsActiveOrder
     public string Frequency { get; set; } = "";
     public int OrderedMinute { get; set; }
     public int? ReportMinute { get; set; }
-    public int? DueMinute { get; set; }
-    public string PerformanceLocation { get; set; } = "";
-    public bool RequiresPatientVisit { get; set; }
-    public string Status { get; set; } = "active";
     public bool IsPending { get; set; }
     public bool HasResult { get; set; }
 }
 
-public class CcsOrderOption
-{
-    public string Code { get; set; } = "";
-    public int TurnaroundMinutes { get; set; }
-    public string PerformanceLocation { get; set; } = "";
-    public bool RequiresPatientVisit { get; set; }
-}
-
 public class CcsCaseScore
 {
     public double Percent { get; set; }
@@ -323,7 +246,6 @@ public class CcsImportResponse
 {
     public int OrdersUpserted { get; set; }
     public int CasesCreated { get; set; }
-    public int CasesSkipped { get; set; }
     public List<string> Errors { get; set; } = [];
 }
 
@@ -365,10 +287,6 @@ public class CcsCaseSummary
     public int RealTimeMinutes { get; set; }
     public int Difficulty { get; set; }
     public List<string> Tags { get; set; } = [];
-    public bool InteractiveInterviewAvailable { get; set; }
-    public bool GraphicalPresentationAvailable { get; set; }
-    public string ExperienceMode { get; set; } = CcsExperienceModes.Management;
-    public CcsGraphicalPresentation GraphicalPresentation { get; set; } = new();
 }
 
 public class CcsAttemptResponse
@@ -389,38 +307,24 @@ public class CcsAttemptResponse
     public DateTime CreatedUtc { get; set; }
     public int RealTimeMinutes { get; set; }
     public int ElapsedSeconds { get; set; }
-    public string ExperienceMode { get; set; } = CcsExperienceModes.Management;
-    public CcsGraphicalPresentation GraphicalPresentation { get; set; } = new();
     public string PatientSummary { get; set; } = "";
     public string ReasonForEncounter { get; set; } = "";
     public string Appearance { get; set; } = "";
     public string History { get; set; } = "";
     public List<CcsNarrativeSection> HistorySections { get; set; } = [];
-    public string MedicalHistory { get; set; } = "";
     public Dictionary<string, string> Vitals { get; set; } = [];
     public List<CcsChartEntry> Chart { get; set; } = [];
     public List<string> ActiveOrderCodes { get; set; } = [];
     public List<CcsActiveOrder> ActiveOrders { get; set; } = [];
-    public List<CcsOrderOption> OrderOptions { get; set; } = [];
     public List<CcsVitalSnapshot> VitalHistory { get; set; } = [];
     public List<CcsPendingResult> PendingResults { get; set; } = [];
     public List<CcsExamDefinition> AvailableExams { get; set; } = [];
     public List<string> AllowedLocations { get; set; } = [];
-    public CcsInterviewStateResponse? Interview { get; set; }
-    public CcsInterviewDebrief? InterviewDebrief { get; set; }
     public CcsCaseScore? Score { get; set; }
     public CcsRatingChange? Rating { get; set; }
     public List<QuestionReference> References { get; set; } = [];
 }
 
-public class CcsInterviewStateResponse
-{
-    public string CurrentNodeId { get; set; } = "";
-    public CcsDialogueNode CurrentNode { get; set; } = new();
-    public List<string> VisitedChoiceIds { get; set; } = [];
-    public bool Completed { get; set; }
-}
-
 public class CcsHistoryItem
 {
     public string Id { get; set; } = "";

api/QuestionsApi/Models/CreditModels.cs

@@ -5,175 +5,13 @@ namespace QuestionsApi.Models;
 
 public static class CreditEconomy
 {
-    public const int RollingEarningLimit = 30;
+    public const int RollingEarningLimit = 20;
     public static readonly TimeSpan EarningWindow = TimeSpan.FromHours(24);
-    public const string ExamTokenSku = "exam_token_1";
-    public const string QBankResetTokenSku = "qbank_reset_1";
-    public const int ExamTokenPrice = 100;
-    public const int QBankResetTokenPrice = 300;
-
-    public static readonly IReadOnlyList<RzStoreProduct> Products =
-    [
-        new()
-        {
-            Sku = ExamTokenSku,
-            Name = "Exam Simulation Token",
-            Description = "Starts one new full exam simulation.",
-            CoinPrice = ExamTokenPrice,
-            Grant = RzStoreGrant.ExamToken
-        },
-        new()
-        {
-            Sku = QBankResetTokenSku,
-            Name = "QBank Reset Token",
-            Description = "Makes every QBank question eligible again without erasing progress.",
-            CoinPrice = QBankResetTokenPrice,
-            Grant = RzStoreGrant.QBankResetToken
-        }
-    ];
-
-    public static RzStoreProduct? FindProduct(string sku) =>
-        Products.FirstOrDefault(value => value.Sku.Equals(sku, StringComparison.Ordinal));
-
-    public static int FirstCorrectAmount(int difficulty) => difficulty >= 5 ? 3 : difficulty >= 4 ? 2 : 1;
-    public static int ReviewAmount(bool delayedRecovery) => delayedRecovery ? 3 : 1;
-}
-
-public static class SlotMachineEconomy
-{
-    public const int SpinCost = 0; // TODO: restore to 50 once testing is done
-    public const int RollingSpinLimit = 200;
-    public static readonly TimeSpan SpinWindow = TimeSpan.FromHours(24);
-
-    public static readonly IReadOnlyList<SpinReward> Rewards =
-    [
-        new() { Key = "jackpot", Label = "10,000 RZ Coins", Description = "Jackpot!", Grant = RzStoreGrant.Coins, CoinAmount = 10000, Probability = 0.005 },
-        new() { Key = "epic", Label = "2,000 RZ Coins", Description = "Epic Reward", Grant = RzStoreGrant.Coins, CoinAmount = 2000, Probability = 0.02 },
-        new() { Key = "great", Label = "500 RZ Coins", Description = "Great Reward", Grant = RzStoreGrant.Coins, CoinAmount = 500, Probability = 0.10 },
-        new() { Key = "exam_token", Label = "Exam Simulation Token", Description = "Starts one new full exam simulation.", Grant = RzStoreGrant.ExamToken, Probability = 0.15 },
-        new() { Key = "qbank_reset", Label = "QBank Reset Token", Description = "Makes every QBank question eligible again.", Grant = RzStoreGrant.QBankResetToken, Probability = 0.20 },
-        new() { Key = "nice", Label = "100 RZ Coins", Description = "Nice!", Grant = RzStoreGrant.Coins, CoinAmount = 100, Probability = 0.30 },
-        new() { Key = "good_luck", Label = "50 RZ Coins", Description = "Good luck!", Grant = RzStoreGrant.Coins, CoinAmount = 50, Probability = 0.225 },
-    ];
-
-    public static SpinReward RollReward(double roll)
-    {
-        var cumulative = 0.0;
-        foreach (var reward in Rewards)
-        {
-            cumulative += reward.Probability;
-            if (roll < cumulative) return reward;
-        }
-        return Rewards[^1];
-    }
-
-    public static SpinReward? FindReward(string key) =>
-        Rewards.FirstOrDefault(value => value.Key.Equals(key, StringComparison.Ordinal));
-}
-
-public enum RzStoreGrant { ExamToken, QBankResetToken, Coins }
-
-public sealed class SpinReward
-{
-    public string Key { get; set; } = "";
-    public string Label { get; set; } = "";
-    public string Description { get; set; } = "";
-    public RzStoreGrant Grant { get; set; }
-    public int CoinAmount { get; set; }
-    public double Probability { get; set; }
-}
-
-public sealed class RzStoreProduct
-{
-    public string Sku { get; set; } = "";
-    public string Name { get; set; } = "";
-    public string Description { get; set; } = "";
-    public int CoinPrice { get; set; }
-    public RzStoreGrant Grant { get; set; }
 }
 
 public sealed class CreditEvent
 {
     public string OperationId { get; set; } = "";
-    public int CoinAmount { get; set; } = 1;
-    public DateTime CreatedUtc { get; set; }
-}
-
-public static class CreditReasonCodes
-{
-    public const string FirstCorrect = "qbank_first_correct";
-    public const string DifficultCorrect = "qbank_difficult_correct";
-    public const string ScheduledReview = "scheduled_review_correct";
-    public const string DelayedRecovery = "delayed_recovery";
-    public const string MasteryPracticing = "mastery_practicing";
-    public const string MasteryStrong = "mastery_strong";
-    public const string MasteryMastered = "mastery_mastered";
-    public const string ExamSimulationComplete = "exam_simulation_complete";
-    public const string SessionGoalComplete = "session_goal_complete";
-    public const string DailyMissionComplete = "daily_mission_complete";
-    public const string WeeklyGoalComplete = "weekly_goal_complete";
-    public const string RankPromotion = "rank_promotion";
-    public const string Purchase = "purchase";
-}
-
-public sealed class CreditLedgerEntry
-{
-    [BsonId]
-    public string Id { get; set; } = "";
-    public string UserId { get; set; } = "";
-    public string OperationId { get; set; } = "";
-    public int RequestedAmount { get; set; }
-    public int Amount { get; set; }
-    public string ReasonCode { get; set; } = "";
-    public string Description { get; set; } = "";
-    public string SourceType { get; set; } = "";
-    public string SourceId { get; set; } = "";
-    public bool SubjectToRollingCap { get; set; }
-    public string State { get; set; } = "pending";
-    public DateTime CreatedUtc { get; set; }
-    public DateTime? AppliedUtc { get; set; }
-}
-
-public sealed class CreditAward
-{
-    public int Amount { get; set; }
-    public string ReasonCode { get; set; } = "";
-    public string Description { get; set; } = "";
-}
-
-public sealed class CreditAwardResult
-{
-    public CreditAward? Award { get; set; }
-    public CreditStatusResponse Status { get; set; } = new();
-}
-
-public sealed class CreditLedgerPage
-{
-    public List<CreditLedgerEntryResponse> Items { get; set; } = [];
-    public DateTime? NextBefore { get; set; }
-}
-
-public sealed class CreditLedgerEntryResponse
-{
-    public int Amount { get; set; }
-    public string ReasonCode { get; set; } = "";
-    public string Description { get; set; } = "";
-    public DateTime CreatedUtc { get; set; }
-}
-
-public sealed class CreditPurchaseEvent
-{
-    public string OperationId { get; set; } = "";
-    public string Sku { get; set; } = "";
-    public int CoinCost { get; set; }
-    public DateTime CreatedUtc { get; set; }
-}
-
-public sealed class SpinEvent
-{
-    public string OperationId { get; set; } = "";
-    public string RewardKey { get; set; } = "";
-    public int CoinsWon { get; set; }
     public DateTime CreatedUtc { get; set; }
 }
 
@@ -184,16 +22,7 @@ public sealed class UserCreditAccount
     public string? Id { get; set; }
     public string UserId { get; set; } = "";
     public int Credits { get; set; }
-    public int ExamTokens { get; set; }
-    public int QBankResetTokens { get; set; }
-    public int BankCycle { get; set; }
-    public bool InitialExamGrantApplied { get; set; }
-    public bool MasteryAwardBaselineApplied { get; set; }
     public List<CreditEvent> RecentEarnings { get; set; } = [];
-    public List<CreditPurchaseEvent> Purchases { get; set; } = [];
-    public List<SpinEvent> Spins { get; set; } = [];
-    public List<CreditEvent> RecentSpins { get; set; } = [];
-    public List<string> AppliedOperations { get; set; } = [];
     public DateTime UpdatedUtc { get; set; } = DateTime.UtcNow;
 }
 
@@ -203,57 +32,4 @@ public sealed class CreditStatusResponse
     public int EarnedInRollingWindow { get; set; }
     public int RemainingEarningCapacity { get; set; }
     public int RollingWindowHours { get; set; } = 24;
-    public int ExamTokens { get; set; }
-    public int QBankResetTokens { get; set; }
-    public int BankCycle { get; set; }
-    public IReadOnlyList<RzStoreProduct> Products { get; set; } = CreditEconomy.Products;
-}
-
-public sealed record CreditAwardRequest(
-    string OperationId,
-    int Amount,
-    string ReasonCode,
-    string Description,
-    string SourceType,
-    string SourceId,
-    bool SubjectToRollingCap = true);
-
-public sealed class CreditPurchaseRequest
-{
-    public string Sku { get; set; } = "";
-    public string OperationId { get; set; } = "";
-}
-
-public sealed class QBankResetRequest
-{
-    public string Confirmation { get; set; } = "";
-    public string OperationId { get; set; } = "";
-}
-
-public sealed class SpinRequest
-{
-    public string OperationId { get; set; } = "";
-}
-
-public enum CreditOperationResult { Succeeded, InsufficientCredits, InsufficientTokens, OperationConflict, RateLimited }
-
-public sealed class CreditOperationResponse
-{
-    public CreditOperationResult Result { get; set; }
-    public CreditStatusResponse Status { get; set; } = new();
-}
-
-public sealed class SpinConfigResponse
-{
-    public int SpinCost { get; set; } = SlotMachineEconomy.SpinCost;
-    public IReadOnlyList<SpinReward> Rewards { get; set; } = SlotMachineEconomy.Rewards;
-}
-
-public sealed class SpinResponse
-{
-    public CreditOperationResult Result { get; set; }
-    public string RewardKey { get; set; } = "";
-    public string RewardLabel { get; set; } = "";
-    public int CoinsWon { get; set; }
-    public CreditStatusResponse Status { get; set; } = new();
 }

api/QuestionsApi/Models/DailyMissionModels.cs

@@ -1,64 +0,0 @@
-using MongoDB.Bson.Serialization.Attributes;
-
-namespace QuestionsApi.Models;
-
-public static class DailyMissionTypes
-{
-    public const string DueReviews = "due_reviews";
-    public const string WeakSystemCorrect = "weak_system_correct";
-    public const string DifficultyFourCorrect = "difficulty_four_correct";
-}
-
-public sealed class DailyMission
-{
-    public string Id { get; set; } = Guid.NewGuid().ToString("N");
-    public string Type { get; set; } = "";
-    public string Title { get; set; } = "";
-    public string Step3System { get; set; } = "";
-    public int DifficultyMin { get; set; }
-    public int Target { get; set; }
-    public int Progress { get; set; }
-    public DateTime StartsUtc { get; set; }
-    public DateTime? CompletedUtc { get; set; }
-    public List<string> AppliedEventIds { get; set; } = [];
-}
-
-public sealed class DailyMissionSet
-{
-    [BsonId]
-    public string Id { get; set; } = "";
-    public string UserId { get; set; } = "";
-    public string DateUtc { get; set; } = "";
-    public List<DailyMission> Missions { get; set; } = [];
-    public List<DailyMission> ReplacementCandidates { get; set; } = [];
-    public bool ReplacementUsed { get; set; }
-    public bool ExpirationRecorded { get; set; }
-    public DateTime CreatedUtc { get; set; }
-    public DateTime ExpiresUtc { get; set; }
-}
-
-public sealed class DailyMissionResponse
-{
-    public string Id { get; set; } = "";
-    public string Type { get; set; } = "";
-    public string Title { get; set; } = "";
-    public string Step3System { get; set; } = "";
-    public int DifficultyMin { get; set; }
-    public int Target { get; set; }
-    public int Progress { get; set; }
-    public bool Completed { get; set; }
-}
-
-public sealed class DailyMissionSetResponse
-{
-    public string DateUtc { get; set; } = "";
-    public DateTime ExpiresUtc { get; set; }
-    public bool ReplacementAvailable { get; set; }
-    public List<DailyMissionResponse> Missions { get; set; } = [];
-}
-
-public sealed class DailyMissionEnvelope
-{
-    public DailyMissionSetResponse State { get; set; } = new();
-    public List<CreditAward> CreditAwards { get; set; } = [];
-}

api/QuestionsApi/Models/DashboardModels.cs

@@ -31,7 +31,6 @@ public sealed class DashboardResponse
     public List<DashboardSystemPerformance> Systems { get; set; } = [];
     public List<DashboardActivityDay> WeeklyActivity { get; set; } = [];
     public List<DashboardRecentActivity> RecentActivity { get; set; } = [];
-    public ProgressionResponse? Progression { get; set; }
 }
 
 public sealed class DashboardTrendPoint
@@ -50,32 +49,6 @@ public sealed class DashboardSystemPerformance
     public int Correct { get; set; }
     public int Total { get; set; }
     public int Accuracy { get; set; }
-    public int MasteryScore { get; set; }
-    public string MasteryState { get; set; } = MasteryStates.Unseen;
-    public int DistinctQuestions { get; set; }
-    public int Difficulty4PlusSuccessful { get; set; }
-    public int PendingReviews { get; set; }
-    public DateTime? LastEvidenceUtc { get; set; }
-    public bool RefreshDue { get; set; }
-    public DashboardMasteryAction RecommendedAction { get; set; } = new();
-}
-
-public static class MasteryStates
-{
-    public const string Unseen = "unseen";
-    public const string Learning = "learning";
-    public const string Practicing = "practicing";
-    public const string Strong = "strong";
-    public const string Mastered = "mastered";
-}
-
-public sealed class DashboardMasteryAction
-{
-    public string Type { get; set; } = "practice";
-    public string Label { get; set; } = "Start learning";
-    public int QuestionCount { get; set; } = 10;
-    public int? DifficultyMin { get; set; }
-    public int? DifficultyMax { get; set; }
 }
 
 public sealed class DashboardActivityDay

api/QuestionsApi/Models/ExamSimulation.cs

@@ -41,7 +41,6 @@ public class ExamSimulationItem
     public int Position { get; set; }
     public List<string> PresentedChoiceIds { get; set; } = [];
     public int QuestionElo { get; set; } = 1000;
-    public int QuestionDifficulty { get; set; }
     public bool WasSeen { get; set; }
     public string BlueprintCategory { get; set; } = "Other";
 }
@@ -53,7 +52,6 @@ public class ExamSimulationResponse
     public List<string> EliminatedChoiceIds { get; set; } = [];
     public bool Flagged { get; set; }
     public int ElapsedSeconds { get; set; }
-    public bool? IsSubmitted { get; set; }
     public DateTime UpdatedUtc { get; set; } = DateTime.UtcNow;
 }
 
@@ -66,9 +64,7 @@ public class ExamSimulationScore
     public int Correct { get; set; }
     public int Total { get; set; }
     public int SeenCount { get; set; }
-    public double RawAccuracy { get; set; }
-    public double DifficultyAdjustedAccuracy { get; set; }
-    public double? AbilityElo { get; set; }
+    public double AbilityElo { get; set; }
     public Dictionary<string, ExamSimulationCategoryScore> Categories { get; set; } = [];
 }
 
@@ -85,7 +81,6 @@ public class SaveSimulationResponseRequest
     public List<string> EliminatedChoiceIds { get; set; } = [];
     public bool Flagged { get; set; }
     public int ElapsedSeconds { get; set; }
-    public bool IsSubmitted { get; set; }
 }
 
 public class ExamSimulationQuestionResponse
@@ -117,11 +112,6 @@ public class ExamSimulationStateResponse
     public Dictionary<string, int> BlueprintTargets { get; set; } = [];
     public Dictionary<string, int> BlueprintActual { get; set; } = [];
     public List<QuestionResponse> ReviewQuestions { get; set; } = [];
-    public CreditStatusResponse? Credits { get; set; }
-    public List<CreditAward> CreditAwards { get; set; } = [];
-    public StudySessionProgress? StudySessionProgress { get; set; }
-    public StudySessionSummary? SessionSummary { get; set; }
-    public ProgressionResponse? Progression { get; set; }
 }
 
 public class ExamSimulationReadinessResponse

api/QuestionsApi/Models/ProgressionModels.cs

@@ -1,98 +0,0 @@
-using MongoDB.Bson;
-using MongoDB.Bson.Serialization.Attributes;
-
-namespace QuestionsApi.Models;
-
-public sealed class UserProgression
-{
-    [BsonId, BsonRepresentation(BsonType.ObjectId)] public string? Id { get; set; }
-    public string UserId { get; set; } = "";
-    public int HighestRankOrdinal { get; set; }
-    public DateTime TrackingStartedUtc { get; set; }
-    public bool BaselineApplied { get; set; }
-    public Dictionary<string, DateTime> EarnedRanksUtc { get; set; } = [];
-    public int CurrentHardStreak { get; set; }
-    public int BestHardStreak { get; set; }
-    public DateTime? BestHardStreakUtc { get; set; }
-    public PersonalRecordValue BestTimedBlock { get; set; } = new();
-    public PersonalRecordValue SystemsAdvancedWeek { get; set; } = new();
-    public PersonalRecordValue ReviewQueueReduction { get; set; } = new();
-    public PersonalRecordValue WeakSystemImprovement { get; set; } = new();
-    public DateTime UpdatedUtc { get; set; }
-}
-
-public sealed class PersonalRecordValue
-{
-    public int Value { get; set; }
-    public int SampleSize { get; set; }
-    public string Detail { get; set; } = "";
-    public DateTime? AchievedUtc { get; set; }
-}
-
-public sealed class ProgressionWeeklySnapshot
-{
-    [BsonId] public string Id { get; set; } = "";
-    public string UserId { get; set; } = "";
-    public DateTime WeekStartUtc { get; set; }
-    public List<ProgressionSystemSnapshot> OpeningSystems { get; set; } = [];
-    public List<ProgressionSystemSnapshot> LatestSystems { get; set; } = [];
-    public int OpeningPendingReviews { get; set; }
-    public int LatestPendingReviews { get; set; }
-    public DateTime UpdatedUtc { get; set; }
-}
-
-public sealed class ProgressionSystemSnapshot
-{
-    public string System { get; set; } = "";
-    public int StateOrdinal { get; set; }
-    public int MasteryScore { get; set; }
-    public int DistinctQuestions { get; set; }
-}
-
-public sealed class ProgressionRequirementResponse
-{
-    public string Key { get; set; } = "";
-    public string Label { get; set; } = "";
-    public int Current { get; set; }
-    public int Required { get; set; }
-    public bool Complete => Current >= Required;
-}
-
-public sealed class ProgressionRecordResponse
-{
-    public string Key { get; set; } = "";
-    public string Label { get; set; } = "";
-    public string Definition { get; set; } = "";
-    public int Value { get; set; }
-    public int SampleSize { get; set; }
-    public string Detail { get; set; } = "";
-    public DateTime? AchievedUtc { get; set; }
-    public bool TrackingFromLaunch { get; set; }
-}
-
-public sealed class ProgressionResponse
-{
-    public int RankOrdinal { get; set; }
-    public int QualifiedRankOrdinal { get; set; }
-    public string RankName { get; set; } = "Case Scout";
-    public string Division { get; set; } = "III";
-    public string DisplayName => $"{RankName} {Division}";
-    public DateTime TrackingStartedUtc { get; set; }
-    public List<string> EarnedBadges { get; set; } = [];
-    public Dictionary<string, DateTime> EarnedRanksUtc { get; set; } = [];
-    public List<ProgressionRankResponse> Ladder { get; set; } = [];
-    public string? NextRankName { get; set; }
-    public string? NextDivision { get; set; }
-    public List<ProgressionRequirementResponse> NextRequirements { get; set; } = [];
-    public List<ProgressionRecordResponse> Records { get; set; } = [];
-}
-
-public sealed class ProgressionRankResponse
-{
-    public int Ordinal { get; set; }
-    public string RankName { get; set; } = "";
-    public string Division { get; set; } = "";
-    public bool Earned { get; set; }
-    public DateTime? EarnedUtc { get; set; }
-    public string RequirementSummary { get; set; } = "";
-}

api/QuestionsApi/Models/Question.cs

@@ -23,7 +23,6 @@ public class Question
     public Dictionary<string, int> ChoiceSelectionPercentages { get; set; } = [];
     public string Discipline { get; set; } = "";
     public string System { get; set; } = "";
-    public string Step3System { get; set; } = "";
     public string PerformanceCategory { get; set; } = "";
     public int Difficulty { get; set; } = 1;
     public List<QuestionLab> Labs { get; set; } = [];

api/QuestionsApi/Models/QuestionAttempt.cs

@@ -11,7 +11,6 @@ public class QuestionAttempt
 
     public string QuestionExternalId { get; set; } = "";
     public string UserId { get; set; } = "";
-    public int BankCycle { get; set; }
     public string ChoiceId { get; set; } = "";
     public List<string> PresentedChoiceIds { get; set; } = [];
     public bool TracksPresentation { get; set; }

api/QuestionsApi/Models/QuestionRequests.cs

@@ -3,7 +3,6 @@ namespace QuestionsApi.Models;
 public class QuestionSearchRequest
 {
     public string? System { get; set; }
-    public string? Step3System { get; set; }
     public string? Discipline { get; set; }
     public List<string> Tags { get; set; } = [];
     public int? DifficultyMin { get; set; }
@@ -51,5 +50,4 @@ public class FirstQuestionAttemptRequest
     public List<string> PresentedChoiceIds { get; set; } = [];
     public int DurationSeconds { get; set; }
     public bool MetTimeLimit { get; set; } = true;
-    public string? StudySessionId { get; set; }
 }

api/QuestionsApi/Models/QuestionResponse.cs

@@ -1,5 +1,3 @@
-using QuestionsApi.Services;
-
 namespace QuestionsApi.Models;
 
 public class QuestionResponse
@@ -20,7 +18,6 @@ public class QuestionResponse
     public string ChoiceSelectionRateBasis { get; set; } = "presented";
     public string Discipline { get; set; } = "";
     public string System { get; set; } = "";
-    public string Step3System { get; set; } = "";
     public string PerformanceCategory { get; set; } = "";
     public int Difficulty { get; set; }
     public int QuestionElo { get; set; } = 1000;
@@ -62,7 +59,6 @@ public class QuestionResponse
                 .ToDictionary(),
             Discipline = question.Discipline,
             System = question.System,
-            Step3System = Step3SystemCatalog.Normalize(question) ?? "",
             PerformanceCategory = RatingCategory.Normalize(question.PerformanceCategory, question.System, question.Discipline),
             Difficulty = question.Difficulty,
             QuestionElo = questionElo,
@@ -146,11 +142,6 @@ public class FirstQuestionAttemptResponse
     public int QuestionElo { get; set; } = 1000;
     public RatingChangeResponse? Rating { get; set; }
     public CreditStatusResponse? Credits { get; set; }
-    public List<CreditAward> CreditAwards { get; set; } = [];
-    public StudySessionProgress? StudySessionProgress { get; set; }
-    public StudySessionSummary? SessionSummary { get; set; }
-    public DailyMissionSetResponse? DailyMissions { get; set; }
-    public ProgressionResponse? Progression { get; set; }
 }
 
 public class SkipQuestionResponse
@@ -160,7 +151,6 @@ public class SkipQuestionResponse
     public Dictionary<string, int> ChoiceSelectionPercentages { get; set; } = [];
     public int QuestionElo { get; set; } = 1000;
     public RatingChangeResponse? Rating { get; set; }
-    public ProgressionResponse? Progression { get; set; }
 }
 
 public static class RatingCategory

api/QuestionsApi/Models/ReviewQueueModels.cs

@@ -55,7 +55,6 @@ public sealed class ReviewQueueNextRequest
 {
     public List<string> ExcludeExternalIds { get; set; } = [];
     public bool SupportsChoicePools { get; set; } = true;
-    public string? Step3System { get; set; }
 }
 
 public sealed class ReviewQueueNextResponse
@@ -73,7 +72,6 @@ public sealed class ReviewQueueAttemptRequest
     public string ChoiceId { get; set; } = "";
     public List<string> PresentedChoiceIds { get; set; } = [];
     public int DurationSeconds { get; set; }
-    public string? StudySessionId { get; set; }
 }
 
 public sealed class ReviewQueueAttemptResponse
@@ -82,12 +80,6 @@ public sealed class ReviewQueueAttemptResponse
     public bool IsCorrect { get; set; }
     public string QueueState { get; set; } = ReviewQueueStates.Pending;
     public int PendingCount { get; set; }
-    public CreditStatusResponse? Credits { get; set; }
-    public List<CreditAward> CreditAwards { get; set; } = [];
-    public StudySessionProgress? StudySessionProgress { get; set; }
-    public StudySessionSummary? SessionSummary { get; set; }
-    public DailyMissionSetResponse? DailyMissions { get; set; }
-    public ProgressionResponse? Progression { get; set; }
 }
 
 public sealed class ReviewQueueRecordResult

api/QuestionsApi/Models/StudySessionModels.cs

@@ -1,106 +0,0 @@
-using MongoDB.Bson;
-using MongoDB.Bson.Serialization.Attributes;
-
-namespace QuestionsApi.Models;
-
-public static class StudyGoalTypes
-{
-    public const string QuestionCount = "question_count";
-    public const string Duration = "duration";
-    public const string WeakSystem = "weak_system";
-    public const string DueReviews = "due_reviews";
-    public const string SimulationBlock = "simulation_block";
-    public static readonly HashSet<string> All = [QuestionCount, Duration, WeakSystem, DueReviews, SimulationBlock];
-}
-
-public static class StudySessionStates
-{
-    public const string Active = "active";
-    public const string Completed = "completed";
-    public const string EndedEarly = "ended_early";
-    public const string Interrupted = "interrupted";
-}
-
-public sealed class StudySession
-{
-    [BsonId]
-    [BsonRepresentation(BsonType.ObjectId)]
-    public string? Id { get; set; }
-    public string UserId { get; set; } = "";
-    public string ClientSessionId { get; set; } = "";
-    public string GoalType { get; set; } = StudyGoalTypes.QuestionCount;
-    public string Mode { get; set; } = "Tutor";
-    public string Step3System { get; set; } = "";
-    public int TargetValue { get; set; } = 10;
-    public string State { get; set; } = StudySessionStates.Active;
-    public int QuestionsCompleted { get; set; }
-    public int Correct { get; set; }
-    public int ReviewsCompleted { get; set; }
-    public int Recovered { get; set; }
-    public int CoinsEarned { get; set; }
-    public List<CreditAward> CoinAwards { get; set; } = [];
-    public List<string> AppliedEventIds { get; set; } = [];
-    public int? InitialMasteryScore { get; set; }
-    public string InitialMasteryState { get; set; } = "";
-    public int? FinalMasteryScore { get; set; }
-    public string FinalMasteryState { get; set; } = "";
-    public int? InitialReadiness { get; set; }
-    public int? FinalReadiness { get; set; }
-    public string SimulationId { get; set; } = "";
-    public int? SimulationBlock { get; set; }
-    public DateTime CreatedUtc { get; set; }
-    public DateTime UpdatedUtc { get; set; }
-    public DateTime? TargetEndUtc { get; set; }
-    public DateTime? CompletedUtc { get; set; }
-}
-
-public sealed class CreateStudySessionRequest
-{
-    public string ClientSessionId { get; set; } = "";
-    public string GoalType { get; set; } = StudyGoalTypes.QuestionCount;
-    public int TargetValue { get; set; } = 10;
-    public string Mode { get; set; } = "Tutor";
-    public string Step3System { get; set; } = "";
-}
-
-public sealed class StudySessionProgress
-{
-    public string Id { get; set; } = "";
-    public string State { get; set; } = "";
-    public string GoalType { get; set; } = "";
-    public int TargetValue { get; set; }
-    public int CompletedValue { get; set; }
-    public int QuestionsCompleted { get; set; }
-    public int SecondsRemaining { get; set; }
-    public bool GoalReached { get; set; }
-}
-
-public sealed class StudySessionSummary
-{
-    public string Id { get; set; } = "";
-    public string State { get; set; } = "";
-    public string GoalType { get; set; } = "";
-    public int TargetValue { get; set; }
-    public int CompletedValue { get; set; }
-    public int QuestionsCompleted { get; set; }
-    public int Correct { get; set; }
-    public int Accuracy { get; set; }
-    public int ReviewsCompleted { get; set; }
-    public int Recovered { get; set; }
-    public int ElapsedSeconds { get; set; }
-    public int CoinsEarned { get; set; }
-    public List<CreditAward> CoinAwards { get; set; } = [];
-    public string Step3System { get; set; } = "";
-    public int? MasteryScoreChange { get; set; }
-    public string InitialMasteryState { get; set; } = "";
-    public string FinalMasteryState { get; set; } = "";
-    public int? ReadinessChange { get; set; }
-    public string ReadinessExplanation { get; set; } = "A completed exam simulation is required to update readiness.";
-    public bool GoalBonusAwarded { get; set; }
-}
-
-public sealed class StudySessionEnvelope
-{
-    public StudySessionProgress Progress { get; set; } = new();
-    public StudySessionSummary? Summary { get; set; }
-}

api/QuestionsApi/Models/WeeklyGoalModels.cs

@@ -1,54 +0,0 @@
-using MongoDB.Bson.Serialization.Attributes;
-
-namespace QuestionsApi.Models;
-
-public static class WeeklyRemediationTypes
-{
-    public const string Reviews = "reviews";
-    public const string HardCorrect = "hard_correct";
-}
-
-public sealed class WeeklyGoal
-{
-    [BsonId] public string Id { get; set; } = "";
-    public string UserId { get; set; } = "";
-    public DateTime WeekStartUtc { get; set; }
-    public DateTime ExpiresUtc { get; set; }
-    public string RemediationType { get; set; } = WeeklyRemediationTypes.Reviews;
-    public int RemediationTarget { get; set; }
-    public List<string> EligibleSystems { get; set; } = [];
-    public DateTime CreatedUtc { get; set; }
-    public DateTime? CompletedUtc { get; set; }
-    public bool RewardIssued { get; set; }
-    public int RewardAmount { get; set; }
-    public bool ExpirationRecorded { get; set; }
-}
-
-public sealed class WeeklyGoalComponentResponse
-{
-    public string Type { get; set; } = "";
-    public string Label { get; set; } = "";
-    public int Progress { get; set; }
-    public int Target { get; set; }
-    public bool Completed { get; set; }
-}
-
-public sealed class WeeklyGoalResponse
-{
-    public DateTime WeekStartUtc { get; set; }
-    public DateTime ExpiresUtc { get; set; }
-    public bool Completed { get; set; }
-    public string RemediationType { get; set; } = "";
-    public List<string> EligibleSystems { get; set; } = [];
-    public string SuggestedSystem { get; set; } = "";
-    public int RewardAmount { get; set; }
-    public int RewardMaximum { get; set; } = 10;
-    public List<WeeklyGoalComponentResponse> Components { get; set; } = [];
-}
-
-public sealed class WeeklyGoalEnvelope
-{
-    public WeeklyGoalResponse State { get; set; } = new();
-    public CreditStatusResponse? Credits { get; set; }
-    public List<CreditAward> CreditAwards { get; set; } = [];
-}

api/QuestionsApi/Program.cs

@@ -29,12 +29,6 @@ if (args.FirstOrDefault() == "promote-dynamic-questions")
     return;
 }
 
-if (args.FirstOrDefault() == "promote-ccs-cases")
-{
-    Environment.ExitCode = await CcsPromotionCommand.RunAsync(args.Skip(1).ToArray(), Console.Out);
-    return;
-}
-
 if (args.FirstOrDefault() == "export-dynamic-review")
 {
     Environment.ExitCode = await DynamicReviewExportCommand.RunAsync(args.Skip(1).ToArray(), Console.Out);
@@ -61,28 +55,6 @@ if (args.FirstOrDefault() == "flag-media-questions")
     return;
 }
 
-if (args.FirstOrDefault() == "migrate-question-attempt-cycles")
-{
-    var migrationConfiguration = new ConfigurationBuilder()
-        .AddJsonFile("appsettings.json", optional: true)
-        .AddEnvironmentVariables()
-        .Build();
-    Environment.ExitCode = await QuestionAttemptCycleMigrationCommand.RunAsync(
-        migrationConfiguration, args.Skip(1).ToArray(), Console.Out);
-    return;
-}
-
-if (args.FirstOrDefault() == "backfill-step3-systems")
-{
-    var migrationConfiguration = new ConfigurationBuilder()
-        .AddJsonFile("appsettings.json", optional: true)
-        .AddEnvironmentVariables()
-        .Build();
-    Environment.ExitCode = await Step3SystemBackfillCommand.RunAsync(
-        migrationConfiguration, args.Skip(1).ToArray(), Console.Out);
-    return;
-}
-
 var builder = WebApplication.CreateBuilder(args);
 builder.Services.AddControllers();
 builder.Services.Configure<ForwardedHeadersOptions>(options =>
@@ -96,8 +68,6 @@ builder.Services.Configure<ForwardedHeadersOptions>(options =>
 builder.Services.AddSingleton<MongoDatabaseProvider>();
 builder.Services.AddSingleton(TimeProvider.System);
 builder.Services.AddSingleton<CreditStore>();
-builder.Services.AddSingleton<MasteryAwardService>();
-builder.Services.AddHostedService<CreditLedgerReconciliationService>();
 builder.Services.AddSingleton<QuestionStore>();
 builder.Services.AddSingleton<QuestionAttemptStore>();
 builder.Services.AddSingleton<AnswerStatisticsStore>();
@@ -117,10 +87,6 @@ builder.Services.AddSingleton<UserNotepadStore>();
 builder.Services.AddSingleton<QuestionBookmarkStore>();
 builder.Services.AddSingleton<ReviewQueueStore>();
 builder.Services.AddSingleton<DashboardStore>();
-builder.Services.AddSingleton<StudySessionStore>();
-builder.Services.AddSingleton<DailyMissionStore>();
-builder.Services.AddSingleton<WeeklyGoalStore>();
-builder.Services.AddSingleton<ProgressionStore>();
 builder.Services.AddSingleton<UserProfileStore>();
 builder.Services.AddSingleton<IFlashcardScheduler, FsrsFlashcardScheduler>();
 builder.Services.AddSingleton<FlashcardDeckStore>();
@@ -148,7 +114,6 @@ builder.Services.AddSingleton<DonationStore>();
 builder.Services.AddSingleton<IStripeDonationGateway, StripeDonationGateway>();
 builder.Services.AddSingleton<ServiceMetrics>();
 builder.Services.AddHostedService<AnswerStatisticsMaintenanceService>();
-builder.Services.AddHostedService<ExamSimulationScoringMigrationService>();
 builder.Services.AddHttpClient();
 builder.Services.AddRateLimiter(options =>
 {

api/QuestionsApi/README.md

@@ -57,14 +57,6 @@ least one embedded authoritative verification reference. Legacy published
 questions without references remain readable but must add references before a
 future authoring update.
 
-Wrong-answer follow-ups are distractor-specific remediation, not generic review
-questions. Each distractor must have a different three-choice quiz about the
-mechanism, indication, contraindication, timing, or other property that makes
-that option inappropriate in the vignette. Its teaching point must explain why
-that distractor fails without revealing the main correct answer. Publication
-validation rejects duplicated prompts, correct follow-up answers, choice sets,
-and teaching points within a question.
-
 - `GET /readyz` verifies MongoDB connectivity for readiness checks.
 - `GET /metrics` exposes Prometheus-format service and reconciliation metrics.
 

api/QuestionsApi/Services/CcsCaseValidator.cs

@@ -4,7 +4,7 @@ namespace QuestionsApi.Services;
 
 public static class CcsCaseValidator
 {
-    private static readonly HashSet<string> CommandTypes = ["exam", "order", "cancel_order", "location", "advance", "interval_history", "acknowledge_opening", "dialogue_choice", "end_case", "exit_case"];
+    private static readonly HashSet<string> CommandTypes = ["exam", "order", "cancel_order", "location", "advance", "interval_history", "acknowledge_opening", "end_case", "exit_case"];
 
     public static List<string> ValidateImport(CcsImportRequest request, IReadOnlySet<string> existingOrderCodes)
     {
@@ -34,17 +34,10 @@ public static class CcsCaseValidator
             if (string.IsNullOrWhiteSpace(item.PresentingLocation)) errors.Add(prefix + "presentingLocation required");
             if (item.RealTimeMinutes is not (10 or 20)) errors.Add(prefix + "realTimeMinutes must be 10 or 20");
             if (item.Difficulty is < 1 or > 5) errors.Add(prefix + "difficulty must be between 1 and 5");
-            if (item.ExperienceMode is not (CcsExperienceModes.Management or CcsExperienceModes.GraphicalInterview))
-                errors.Add(prefix + "experienceMode is invalid");
-            if (item.ExperienceMode == CcsExperienceModes.GraphicalInterview
-                && (string.IsNullOrWhiteSpace(item.GraphicalPresentation.SceneKey)
-                    || string.IsNullOrWhiteSpace(item.GraphicalPresentation.PatientAssetKey)))
-                errors.Add(prefix + "graphical interviews require sceneKey and patientAssetKey");
             if (string.IsNullOrWhiteSpace(item.InitialChart.PatientSummary) || string.IsNullOrWhiteSpace(item.InitialChart.ReasonForEncounter))
                 errors.Add(prefix + "initial patient summary and reason are required");
             if (!item.AllowedLocations.Contains(item.PresentingLocation, StringComparer.OrdinalIgnoreCase))
                 errors.Add(prefix + "allowedLocations must include presentingLocation");
-            ValidateInterview(item.InitialInterview, prefix, errors);
             if (item.IsPublished)
             {
                 var referenceError = QuestionValidator.ValidateReferences(item.References, true);
@@ -60,9 +53,6 @@ public static class CcsCaseValidator
             foreach (var response in item.OrderResponses)
             {
                 if (!orderCodes.Contains(response.OrderCode)) errors.Add(prefix + $"unknown order code {response.OrderCode}");
-                if (response.TurnaroundMinutes < 0) errors.Add(prefix + $"order response {response.OrderCode} turnaroundMinutes cannot be negative");
-                if (response.RequiresPatientVisit && string.IsNullOrWhiteSpace(response.PerformanceLocation))
-                    errors.Add(prefix + $"order response {response.OrderCode} requires a performanceLocation");
                 if (!string.IsNullOrWhiteSpace(response.ResultSection) && !CcsChartCategories.ResultSections.Contains(response.ResultSection))
                     errors.Add(prefix + $"order response {response.OrderCode} resultSection is invalid");
             }
@@ -82,10 +72,6 @@ public static class CcsCaseValidator
                     if (criterion.ActionType == "order" && !orderCodes.Contains(target)) errors.Add(prefix + $"criterion {criterion.Id} references unknown order {target}");
                     if (criterion.ActionType == "exam" && !examCodes.Contains(target, StringComparer.OrdinalIgnoreCase)) errors.Add(prefix + $"criterion {criterion.Id} references unknown exam {target}");
                     if (criterion.ActionType == "location" && !item.AllowedLocations.Contains(target, StringComparer.OrdinalIgnoreCase)) errors.Add(prefix + $"criterion {criterion.Id} references unknown location {target}");
-                    if (criterion.ActionType == "dialogue_choice"
-                        && !item.InitialInterview.Topics.Any(value => value.Id.Equals(target, StringComparison.OrdinalIgnoreCase))
-                        && !item.InitialInterview.Nodes.SelectMany(value => value.Choices).Any(value => value.Id.Equals(target, StringComparison.OrdinalIgnoreCase)))
-                        errors.Add(prefix + $"criterion {criterion.Id} references unknown dialogue choice {target}");
                 }
             }
         }
@@ -104,7 +90,7 @@ public static class CcsCaseValidator
         if (string.IsNullOrWhiteSpace(request.CommandId)) return "commandId required";
         if (request.ExpectedRevision < 0) return "expectedRevision cannot be negative";
         if (!CommandTypes.Contains(request.Type)) return "unsupported command type";
-        if ((request.Type is "exam" or "order" or "cancel_order" or "location" or "dialogue_choice") && string.IsNullOrWhiteSpace(request.Code)) return "code required";
+        if ((request.Type is "exam" or "order" or "cancel_order" or "location") && string.IsNullOrWhiteSpace(request.Code)) return "code required";
         if (request.Type == "advance" && request.Minutes is < 1 or > 525600) return "advance minutes must be between 1 and 525600";
         return null;
     }
@@ -133,96 +119,4 @@ public static class CcsCaseValidator
             return "history and examinations cannot be mixed with order changes in one batch";
         return null;
     }
-
-    private static void ValidateInterview(CcsInitialInterview interview, string prefix, List<string> errors)
-    {
-        if (interview.Topics.Count > 0)
-        {
-            if (interview.Nodes.Count > 0 || !string.IsNullOrWhiteSpace(interview.StartNodeId))
-                errors.Add(prefix + "initialInterview cannot combine topics with nodes");
-            if (string.IsNullOrWhiteSpace(interview.OpeningPatientText))
-                errors.Add(prefix + "topic interview requires openingPatientText");
-            if (string.IsNullOrWhiteSpace(interview.FinishChoiceText) || string.IsNullOrWhiteSpace(interview.ClosingPatientText))
-                errors.Add(prefix + "topic interview requires finishChoiceText and closingPatientText");
-            var topicIds = interview.Topics.Select(value => value.Id).ToList();
-            if (topicIds.Any(string.IsNullOrWhiteSpace)
-                || topicIds.Distinct(StringComparer.OrdinalIgnoreCase).Count() != topicIds.Count)
-                errors.Add(prefix + "interview topic ids must be present and unique");
-            if (topicIds.Contains("finish_interview", StringComparer.OrdinalIgnoreCase))
-                errors.Add(prefix + "finish_interview is a reserved interview topic id");
-            if (!interview.Topics.Any(value => value.Required))
-                errors.Add(prefix + "topic interview requires at least one required topic");
-            foreach (var topic in interview.Topics)
-            {
-                if (string.IsNullOrWhiteSpace(topic.ClinicianText))
-                    errors.Add(prefix + $"interview topic {topic.Id} requires clinicianText");
-                if (string.IsNullOrWhiteSpace(topic.PatientText))
-                    errors.Add(prefix + $"interview topic {topic.Id} requires patientText");
-                foreach (var prerequisite in topic.PrerequisiteTopicIds)
-                    if (!topicIds.Contains(prerequisite, StringComparer.OrdinalIgnoreCase)
-                        || prerequisite.Equals(topic.Id, StringComparison.OrdinalIgnoreCase))
-                        errors.Add(prefix + $"interview topic {topic.Id} has an invalid prerequisite {prerequisite}");
-            }
-            var topicMap = interview.Topics.ToDictionary(value => value.Id, StringComparer.OrdinalIgnoreCase);
-            var resolved = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
-            var resolving = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
-            bool ResolveTopic(string topicId)
-            {
-                if (resolving.Contains(topicId))
-                {
-                    errors.Add(prefix + "interview topic prerequisites cannot contain cycles");
-                    return false;
-                }
-                if (resolved.Contains(topicId)) return true;
-                resolving.Add(topicId);
-                if (topicMap.TryGetValue(topicId, out var topic))
-                    foreach (var prerequisite in topic.PrerequisiteTopicIds.Where(topicMap.ContainsKey))
-                        ResolveTopic(prerequisite);
-                resolving.Remove(topicId);
-                resolved.Add(topicId);
-                return true;
-            }
-            foreach (var topic in interview.Topics) ResolveTopic(topic.Id);
-            return;
-        }
-        if (string.IsNullOrWhiteSpace(interview.StartNodeId) && interview.Nodes.Count == 0) return;
-        if (string.IsNullOrWhiteSpace(interview.StartNodeId)) errors.Add(prefix + "initialInterview.startNodeId required");
-        if (interview.Nodes.Count == 0) { errors.Add(prefix + "initialInterview.nodes required"); return; }
-        var nodeIds = interview.Nodes.Select(value => value.Id).ToList();
-        if (nodeIds.Any(string.IsNullOrWhiteSpace) || nodeIds.Distinct(StringComparer.OrdinalIgnoreCase).Count() != nodeIds.Count)
-            errors.Add(prefix + "interview node ids must be present and unique");
-        var nodeMap = interview.Nodes.Where(value => !string.IsNullOrWhiteSpace(value.Id))
-            .GroupBy(value => value.Id, StringComparer.OrdinalIgnoreCase).ToDictionary(value => value.Key, value => value.First(), StringComparer.OrdinalIgnoreCase);
-        if (!nodeMap.ContainsKey(interview.StartNodeId)) errors.Add(prefix + "interview start node does not exist");
-        var choiceIds = interview.Nodes.SelectMany(value => value.Choices).Select(value => value.Id).ToList();
-        if (choiceIds.Any(string.IsNullOrWhiteSpace) || choiceIds.Distinct(StringComparer.OrdinalIgnoreCase).Count() != choiceIds.Count)
-            errors.Add(prefix + "interview choice ids must be present and globally unique");
-        foreach (var node in interview.Nodes)
-        {
-            if (string.IsNullOrWhiteSpace(node.PatientText)) errors.Add(prefix + $"interview node {node.Id} requires patientText");
-            if (node.IsTerminal && node.Choices.Count > 0) errors.Add(prefix + $"terminal interview node {node.Id} cannot have choices");
-            if (!node.IsTerminal && node.Choices.Count == 0) errors.Add(prefix + $"nonterminal interview node {node.Id} requires choices");
-            foreach (var choice in node.Choices)
-            {
-                if (string.IsNullOrWhiteSpace(choice.Text)) errors.Add(prefix + $"interview choice {choice.Id} requires text");
-                if (string.IsNullOrWhiteSpace(choice.NextNodeId) || !nodeMap.ContainsKey(choice.NextNodeId))
-                    errors.Add(prefix + $"interview choice {choice.Id} references an unknown next node");
-            }
-        }
-        if (!nodeMap.ContainsKey(interview.StartNodeId)) return;
-        var visited = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
-        var visiting = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
-        bool Walk(string nodeId)
-        {
-            if (visiting.Contains(nodeId)) { errors.Add(prefix + "interview graph cannot contain cycles"); return false; }
-            if (visited.Contains(nodeId)) return true;
-            visiting.Add(nodeId);
-            if (nodeMap.TryGetValue(nodeId, out var node))
-                foreach (var choice in node.Choices.Where(value => nodeMap.ContainsKey(value.NextNodeId))) Walk(choice.NextNodeId);
-            visiting.Remove(nodeId); visited.Add(nodeId); return true;
-        }
-        Walk(interview.StartNodeId);
-        if (visited.Count != nodeMap.Count) errors.Add(prefix + "every interview node must be reachable from startNodeId");
-        if (!interview.Nodes.Any(value => value.IsTerminal)) errors.Add(prefix + "interview requires a terminal node");
-    }
 }

api/QuestionsApi/Services/CcsPromotionCommand.cs

@@ -1,92 +0,0 @@
-using Microsoft.Extensions.Configuration;
-using MongoDB.Driver;
-using QuestionsApi.Models;
-using System.Text.Json;
-
-namespace QuestionsApi.Services;
-
-public static class CcsPromotionCommand
-{
-    public static async Task<int> RunAsync(string[] args, TextWriter output)
-    {
-        var apply = args.Contains("--apply", StringComparer.OrdinalIgnoreCase);
-        var sourceIndex = Array.FindIndex(args, value => value.Equals("--source", StringComparison.OrdinalIgnoreCase));
-        var source = sourceIndex >= 0 && sourceIndex + 1 < args.Length
-            ? args[sourceIndex + 1]
-            : Path.Combine(AppContext.BaseDirectory, "content", "ccs");
-        var files = File.Exists(source)
-            ? new[] { source }
-            : Directory.Exists(source)
-                ? Directory.EnumerateFiles(source, "*.json", SearchOption.AllDirectories).ToArray()
-                : [];
-        if (files.Length == 0)
-        {
-            await output.WriteLineAsync($"CCS content not found: {source}");
-            return 2;
-        }
-
-        var json = new JsonSerializerOptions(JsonSerializerDefaults.Web) { PropertyNameCaseInsensitive = true };
-        var request = new CcsImportRequest();
-        foreach (var file in files)
-        {
-            var parsed = JsonSerializer.Deserialize<CcsImportRequest>(await File.ReadAllTextAsync(file), json)
-                ?? throw new InvalidDataException($"Could not parse CCS content: {file}");
-            request.Orders.AddRange(parsed.Orders);
-            request.Cases.AddRange(parsed.Cases);
-        }
-        var duplicateOrders = request.Orders.GroupBy(value => value.Code, StringComparer.OrdinalIgnoreCase)
-            .Where(value => value.Count() > 1).Select(value => value.Key).ToList();
-        if (duplicateOrders.Count > 0)
-            throw new InvalidDataException($"Duplicate CCS order codes: {string.Join(", ", duplicateOrders)}");
-
-        var configuration = new ConfigurationBuilder().AddJsonFile("appsettings.json", optional: true)
-            .AddEnvironmentVariables().Build();
-        var mongo = new MongoDatabaseProvider(configuration);
-        var orders = mongo.Database.GetCollection<CcsOrderDefinition>("CcsOrderCatalog");
-        var cases = mongo.Database.GetCollection<CcsCaseRevision>("CcsCaseRevisions");
-        var existingCodes = (await orders.Find(Builders<CcsOrderDefinition>.Filter.Empty)
-            .Project(value => value.Code).ToListAsync()).ToHashSet(StringComparer.OrdinalIgnoreCase);
-        var errors = CcsCaseValidator.ValidateImport(request, existingCodes);
-        if (errors.Count > 0)
-        {
-            foreach (var error in errors) await output.WriteLineAsync(error);
-            return 1;
-        }
-        await output.WriteLineAsync($"Validated {request.Cases.Count} CCS case(s) and {request.Orders.Count} order(s).");
-        if (!apply)
-        {
-            await output.WriteLineAsync("Dry run only. Pass --apply to publish.");
-            return 0;
-        }
-
-        foreach (var order in request.Orders)
-        {
-            order.Code = order.Code.Trim().ToLowerInvariant();
-            order.UpdatedUtc = DateTime.UtcNow;
-            await orders.ReplaceOneAsync(value => value.Code == order.Code, order, new ReplaceOptions { IsUpsert = true });
-        }
-        var created = 0;
-        var unchanged = 0;
-        foreach (var incoming in request.Cases)
-        {
-            var current = await cases.Find(value => value.ExternalId == incoming.ExternalId && value.IsCurrent)
-                .SortByDescending(value => value.Version).FirstOrDefaultAsync();
-            if (current is not null && CcsStore.CaseContentDocument(current).Equals(CcsStore.CaseContentDocument(incoming)))
-            {
-                unchanged++;
-                continue;
-            }
-            if (current is not null)
-                await cases.UpdateOneAsync(value => value.Id == current.Id,
-                    Builders<CcsCaseRevision>.Update.Set(value => value.IsCurrent, false));
-            incoming.Id = null;
-            incoming.Version = (current?.Version ?? 0) + 1;
-            incoming.IsCurrent = true;
-            incoming.CreatedUtc = DateTime.UtcNow;
-            await cases.InsertOneAsync(incoming);
-            created++;
-        }
-        await output.WriteLineAsync($"Promotion complete: {created} created, {unchanged} unchanged.");
-        return 0;
-    }
-}

api/QuestionsApi/Services/CcsStore.cs

@@ -50,16 +50,10 @@ public sealed class CcsStore
             await _orders.ReplaceOneAsync(value => value.Code == order.Code, order, new ReplaceOptions { IsUpsert = true });
         }
         var created = 0;
-        var skipped = 0;
         foreach (var incoming in request.Cases)
         {
             var current = await _cases.Find(value => value.ExternalId == incoming.ExternalId && value.IsCurrent)
                 .SortByDescending(value => value.Version).FirstOrDefaultAsync();
-            if (current is not null && CaseContentDocument(current).Equals(CaseContentDocument(incoming)))
-            {
-                skipped++;
-                continue;
-            }
             if (current is not null)
                 await _cases.UpdateOneAsync(value => value.Id == current.Id, Builders<CcsCaseRevision>.Update.Set(value => value.IsCurrent, false));
             incoming.Id = null;
@@ -69,17 +63,7 @@ public sealed class CcsStore
             await _cases.InsertOneAsync(incoming);
             created++;
         }
-        return new CcsImportResponse { OrdersUpserted = request.Orders.Count, CasesCreated = created, CasesSkipped = skipped };
-    }
-
-    internal static BsonDocument CaseContentDocument(CcsCaseRevision value)
-    {
-        var document = value.ToBsonDocument();
-        document.Remove("_id");
-        document.Remove(nameof(CcsCaseRevision.Version));
-        document.Remove(nameof(CcsCaseRevision.IsCurrent));
-        document.Remove(nameof(CcsCaseRevision.CreatedUtc));
-        return document;
+        return new CcsImportResponse { OrdersUpserted = request.Orders.Count, CasesCreated = created };
     }
 
     public async Task<List<CcsCaseSummary>> ListCasesAsync() =>
@@ -124,8 +108,6 @@ public sealed class CcsStore
         }
         if (definition is null) throw new KeyNotFoundException("CCS case not found.");
         var now = DateTime.UtcNow;
-        var interview = EffectiveInterview(definition);
-        var interviewStartNodeId = definition.InitialInterview.Topics.Count > 0 ? "opening" : interview.StartNodeId;
         var attempt = new CcsAttempt
         {
             UserId = userId,
@@ -135,7 +117,6 @@ public sealed class CcsStore
             CaseVersion = definition.Version,
             Mode = CcsAttemptModes.Timed,
             OpeningCompleted = false,
-            InterviewNodeId = interviewStartNodeId,
             Location = definition.PresentingLocation,
             CurrentVitals = new Dictionary<string, string>(definition.InitialChart.Vitals),
             VitalHistory =
@@ -143,11 +124,9 @@ public sealed class CcsStore
                 new CcsVitalSnapshot { SimulatedMinute = 0, Values = new Dictionary<string, string>(definition.InitialChart.Vitals) }
             ],
             ActiveOrderCodes = definition.InitialChart.InitialOrderCodes.Distinct(StringComparer.OrdinalIgnoreCase).ToList(),
-            DeadlineUtc = definition.ExperienceMode == CcsExperienceModes.GraphicalInterview
-                ? null : now.AddMinutes(ActivePhaseMinutes(definition.RealTimeMinutes)),
-            HardDeadlineUtc = definition.ExperienceMode == CcsExperienceModes.GraphicalInterview
-                ? null : now.AddMinutes(definition.RealTimeMinutes),
-            RatingEligible = definition.ExperienceMode != CcsExperienceModes.GraphicalInterview,
+            DeadlineUtc = now.AddMinutes(ActivePhaseMinutes(definition.RealTimeMinutes)),
+            HardDeadlineUtc = now.AddMinutes(definition.RealTimeMinutes),
+            RatingEligible = true,
             Chart =
             [
                 new CcsChartEntry { Category = CcsChartCategories.Progress, Code = "reason_for_encounter", Title = "Reason for encounter", Text = definition.InitialChart.ReasonForEncounter },
@@ -248,7 +227,6 @@ public sealed class CcsStore
             case "acknowledge_opening":
                 attempt.OpeningCompleted = true;
                 break;
-            case "dialogue_choice": ApplyDialogueChoice(attempt, definition, command.Code, now); break;
             case "end_case": EnterFinalOrders(attempt); break;
             case "exit_case": await CompleteAsync(attempt); break;
         }
@@ -411,23 +389,6 @@ public sealed class CcsStore
     {
         var definition = await DefinitionAsync(attempt);
         var completed = attempt.State == CcsAttemptStates.Completed;
-        var optionCodes = definition.OrderResponses.Select(response => response.OrderCode).ToList();
-        List<CcsOrderDefinition> optionCatalog = definition.ExperienceMode == CcsExperienceModes.GraphicalInterview
-            ? await _orders.Find(value => optionCodes.Contains(value.Code)).ToListAsync()
-            : [];
-        var orderOptions = definition.ExperienceMode == CcsExperienceModes.GraphicalInterview
-            ? definition.OrderResponses.Select(response =>
-        {
-            var catalog = optionCatalog.FirstOrDefault(value => value.Code.Equals(response.OrderCode, StringComparison.OrdinalIgnoreCase));
-            return new CcsOrderOption
-            {
-                Code = response.OrderCode,
-                TurnaroundMinutes = response.TurnaroundMinutes ?? catalog?.DefaultTurnaroundMinutes ?? 0,
-                PerformanceLocation = PerformanceLocation(response, catalog, attempt.Location),
-                RequiresPatientVisit = response.RequiresPatientVisit
-            };
-        }).ToList()
-            : [];
         List<CcsOrderDefinition> activeCatalog = attempt.ActiveOrderCodes.Count == 0
             ? []
             : await _orders.Find(value => attempt.ActiveOrderCodes.Contains(value.Code)).ToListAsync();
@@ -440,105 +401,44 @@ public sealed class CcsStore
             var reported = attempt.Chart.LastOrDefault(value =>
                 value.Code.Equals(order.Code, StringComparison.OrdinalIgnoreCase)
                 && value.Category is not CcsChartCategories.Orders);
-            var response = definition.OrderResponses.FirstOrDefault(value =>
-                value.OrderCode.Equals(order.Code, StringComparison.OrdinalIgnoreCase));
-            var performanceLocation = pending?.PerformanceLocation ?? PerformanceLocation(response, order, attempt.Location);
-            var requiresPatientVisit = pending?.RequiresPatientVisit ?? response?.RequiresPatientVisit == true;
             return new CcsActiveOrder
             {
                 Code = order.Code, Name = order.CanonicalName, Category = order.Category,
                 Route = order.DisplayRoute, Frequency = order.DisplayFrequency, OrderedMinute = orderedMinute,
                 ReportMinute = pending is not null ? null : reported?.SimulatedMinute,
-                DueMinute = pending?.DueMinute, PerformanceLocation = performanceLocation,
-                RequiresPatientVisit = requiresPatientVisit,
-                Status = pending is not null ? (requiresPatientVisit ? "scheduled" : "pending")
-                    : reported is not null ? "completed" : "active",
                 IsPending = pending is not null, HasResult = reported is not null
             };
         }).OrderBy(value => value.OrderedMinute).ThenBy(value => value.Name).ToList();
         List<CcsVitalSnapshot> vitalHistory = attempt.VitalHistory.Count > 0
             ? attempt.VitalHistory
             : [new CcsVitalSnapshot { SimulatedMinute = attempt.SimulatedMinute, Values = new Dictionary<string, string>(attempt.CurrentVitals) }];
-        CcsInterviewStateResponse? interview = null;
-        var currentInterviewNode = CurrentInterviewNode(attempt, definition);
-        var openingCompleted = attempt.OpeningCompleted ?? true;
-        if (definition.InitialInterview.Topics.Count > 0 && currentInterviewNode?.IsTerminal != true)
-            openingCompleted = false;
-        if (currentInterviewNode is not null)
-        {
-            interview = new CcsInterviewStateResponse
-            {
-                CurrentNodeId = currentInterviewNode.Id,
-                CurrentNode = currentInterviewNode,
-                VisitedChoiceIds = attempt.InterviewChoiceIds,
-                Completed = openingCompleted
-            };
-        }
         return new CcsAttemptResponse
         {
             Id = attempt.Id ?? "", CaseExternalId = attempt.CaseExternalId,
             CaseTitle = completed ? definition.Title : $"CCS Case {attempt.CaseExternalId}",
             Mode = attempt.Mode, State = attempt.State, Revision = attempt.Revision,
             SimulatedMinute = attempt.SimulatedMinute, SimulatedStartUtc = definition.InitialChart.SimulatedStartUtc,
-            OpeningCompleted = openingCompleted, Location = attempt.Location,
+            OpeningCompleted = attempt.OpeningCompleted ?? true, Location = attempt.Location,
             DeadlineUtc = attempt.DeadlineUtc, HardDeadlineUtc = attempt.HardDeadlineUtc,
             FinalOrdersDeadlineUtc = attempt.FinalOrdersDeadlineUtc,
             CreatedUtc = attempt.CreatedUtc, RealTimeMinutes = definition.RealTimeMinutes,
             ElapsedSeconds = Math.Max(0, (int)Math.Round(((attempt.CompletedUtc ?? DateTime.UtcNow) - attempt.CreatedUtc).TotalSeconds)),
-            ExperienceMode = definition.ExperienceMode, GraphicalPresentation = definition.GraphicalPresentation,
             PatientSummary = definition.InitialChart.PatientSummary, ReasonForEncounter = definition.InitialChart.ReasonForEncounter,
-            Appearance = definition.InitialChart.Appearance,
-            History = definition.ExperienceMode == CcsExperienceModes.GraphicalInterview && !completed
-                ? "" : definition.InitialChart.History,
-            HistorySections = definition.ExperienceMode == CcsExperienceModes.GraphicalInterview && !completed
-                ? [] : definition.InitialChart.HistorySections,
-            MedicalHistory = MedicalHistory(definition),
+            Appearance = definition.InitialChart.Appearance, History = definition.InitialChart.History,
+            HistorySections = definition.InitialChart.HistorySections,
             Vitals = attempt.CurrentVitals, Chart = attempt.Chart, ActiveOrderCodes = attempt.ActiveOrderCodes,
-            ActiveOrders = activeOrders, OrderOptions = orderOptions, VitalHistory = vitalHistory,
+            ActiveOrders = activeOrders, VitalHistory = vitalHistory,
             PendingResults = attempt.PendingResults.Select(value => new CcsPendingResult
             {
-                OrderCode = value.OrderCode, DueMinute = value.DueMinute, Category = value.Category, Title = value.Title,
-                PerformanceLocation = value.PerformanceLocation, RequiresPatientVisit = value.RequiresPatientVisit
+                OrderCode = value.OrderCode, DueMinute = value.DueMinute, Category = value.Category, Title = value.Title
             }).ToList(),
             AvailableExams = attempt.State == CcsAttemptStates.Active ? definition.Exams : [],
             AllowedLocations = attempt.State == CcsAttemptStates.Active ? definition.AllowedLocations : [],
-            Interview = interview,
-            InterviewDebrief = completed && definition.ExperienceMode == CcsExperienceModes.GraphicalInterview
-                ? definition.InitialInterview.Debrief : null,
             Score = completed ? attempt.Score : null, Rating = completed ? attempt.Rating : null,
             References = completed ? definition.References : []
         };
     }
 
-    public static void ApplyDialogueChoice(CcsAttempt attempt, CcsCaseRevision definition, string choiceId, DateTime now)
-    {
-        if (definition.InitialInterview.Topics.Count > 0)
-        {
-            if (attempt.OpeningCompleted == true
-                && attempt.InterviewNodeId.Equals("complete", StringComparison.OrdinalIgnoreCase))
-                throw new InvalidOperationException("The initial interview is already complete.");
-            // Attempts that passed through the legacy classic opening can have
-            // this flag set before any graphical topic was completed.
-            attempt.OpeningCompleted = false;
-            ApplyTopicChoice(attempt, definition.InitialInterview, choiceId, now);
-            return;
-        }
-        if (attempt.OpeningCompleted == true) throw new InvalidOperationException("The initial interview is already complete.");
-        var interview = EffectiveInterview(definition);
-        var node = interview.Nodes.FirstOrDefault(value =>
-            value.Id.Equals(attempt.InterviewNodeId, StringComparison.OrdinalIgnoreCase))
-            ?? throw new InvalidOperationException("The interactive interview is unavailable.");
-        var choice = node.Choices.FirstOrDefault(value => value.Id.Equals(choiceId, StringComparison.OrdinalIgnoreCase))
-            ?? throw new ArgumentException("The dialogue choice is not available at the current interview node.");
-        var next = interview.Nodes.FirstOrDefault(value =>
-            value.Id.Equals(choice.NextNodeId, StringComparison.OrdinalIgnoreCase))
-            ?? throw new InvalidOperationException("The dialogue choice target is unavailable.");
-        attempt.Actions.Add(Action("dialogue_choice", choice.Id, attempt.SimulatedMinute, now));
-        attempt.InterviewChoiceIds.Add(choice.Id);
-        attempt.InterviewNodeId = next.Id;
-        if (next.IsTerminal) attempt.OpeningCompleted = true;
-    }
-
     public async Task AbandonAsync(CcsAttempt attempt)
     {
         attempt.State = CcsAttemptStates.Abandoned;
@@ -551,31 +451,23 @@ public sealed class CcsStore
     {
         code = code.Trim().ToLowerInvariant();
         var catalog = await _orders.Find(value => value.Code == code).FirstOrDefaultAsync() ?? throw new ArgumentException("Unknown order code.");
-        var response = definition.OrderResponses.FirstOrDefault(value => value.OrderCode.Equals(code, StringComparison.OrdinalIgnoreCase));
-        if (definition.ExperienceMode == CcsExperienceModes.GraphicalInterview && response is null)
-            throw new InvalidOperationException("That order is not configured for this case.");
-        if (response is null && catalog.AvailableLocations.Count > 0 && !catalog.AvailableLocations.Contains(attempt.Location, StringComparer.OrdinalIgnoreCase))
+        if (catalog.AvailableLocations.Count > 0 && !catalog.AvailableLocations.Contains(attempt.Location, StringComparer.OrdinalIgnoreCase))
             throw new InvalidOperationException("That order is unavailable at the current location.");
         attempt.Actions.Add(Action("order", code, attempt.SimulatedMinute, now));
         if (!attempt.ActiveOrderCodes.Contains(code, StringComparer.OrdinalIgnoreCase)) attempt.ActiveOrderCodes.Add(code);
+        var response = definition.OrderResponses.FirstOrDefault(value => value.OrderCode.Equals(code, StringComparison.OrdinalIgnoreCase));
         var delay = response?.TurnaroundMinutes ?? catalog.DefaultTurnaroundMinutes;
-        var performanceLocation = PerformanceLocation(response, catalog, attempt.Location);
-        var requiresPatientVisit = response?.RequiresPatientVisit == true;
         var resultCategory = ResultCategory(response?.ResultSection, catalog.ResultSection, catalog.Category);
         if (response is not null && (!string.IsNullOrWhiteSpace(response.Result) || response.VitalPatches.Count > 0))
             attempt.PendingResults.Add(new CcsPendingResult
             {
                 OrderCode = code, Category = resultCategory, Title = catalog.CanonicalName,
-                DueMinute = attempt.SimulatedMinute + delay, Result = response.Result, VitalPatches = response.VitalPatches,
-                PerformanceLocation = performanceLocation, RequiresPatientVisit = requiresPatientVisit
+                DueMinute = attempt.SimulatedMinute + delay, Result = response.Result, VitalPatches = response.VitalPatches
             });
         attempt.Chart.Add(new CcsChartEntry
         {
             Category = CcsChartCategories.Orders, Code = code, Title = catalog.CanonicalName,
-            SimulatedMinute = attempt.SimulatedMinute,
-            Text = requiresPatientVisit
-                ? $"Scheduled: {catalog.CanonicalName} at {Humanize(performanceLocation)}; expected in {delay} minutes."
-                : $"Ordered: {catalog.CanonicalName}"
+            SimulatedMinute = attempt.SimulatedMinute, Text = $"Ordered: {catalog.CanonicalName}"
         });
         if (delay == 0 && processImmediately) ProcessDue(attempt);
     }
@@ -640,13 +532,6 @@ public sealed class CcsStore
         var vitalsChanged = false;
         foreach (var result in due)
         {
-            if (result.RequiresPatientVisit)
-                attempt.Chart.Add(new CcsChartEntry
-                {
-                    Category = CcsChartCategories.Progress, Code = $"{result.OrderCode}_completed", Title = "Patient returned",
-                    SimulatedMinute = attempt.SimulatedMinute,
-                    Text = $"The patient completed {result.Title} at {Humanize(result.PerformanceLocation)} and returned."
-                });
             if (!string.IsNullOrWhiteSpace(result.Result))
                 attempt.Chart.Add(new CcsChartEntry
                 {
@@ -660,13 +545,6 @@ public sealed class CcsStore
         if (vitalsChanged) SnapshotVitals(attempt);
     }
 
-    private static string PerformanceLocation(CcsCaseOrderDefinition? response, CcsOrderDefinition? catalog, string currentLocation)
-    {
-        if (!string.IsNullOrWhiteSpace(response?.PerformanceLocation)) return response.PerformanceLocation;
-        if (catalog?.AvailableLocations.Contains(currentLocation, StringComparer.OrdinalIgnoreCase) == true) return currentLocation;
-        return catalog?.AvailableLocations.FirstOrDefault() ?? currentLocation;
-    }
-
     private static bool ProcessEvents(CcsAttempt attempt, CcsCaseRevision definition)
     {
         var activeOrders = attempt.Actions.Where(value => value.Type == "order").Select(value => value.Code).ToHashSet(StringComparer.OrdinalIgnoreCase);
@@ -815,137 +693,8 @@ public sealed class CcsStore
     {
         ExternalId = value.ExternalId, Title = value.Title, System = value.System,
         PresentingLocation = value.PresentingLocation, RealTimeMinutes = value.RealTimeMinutes,
-        Difficulty = value.Difficulty, Tags = value.Tags,
-        InteractiveInterviewAvailable = value.InitialInterview.Topics.Count > 0 || EffectiveInterview(value).Nodes.Count > 0,
-        GraphicalPresentationAvailable = !string.IsNullOrWhiteSpace(value.GraphicalPresentation.SceneKey)
-            && !string.IsNullOrWhiteSpace(value.GraphicalPresentation.PatientAssetKey),
-        ExperienceMode = value.ExperienceMode, GraphicalPresentation = value.GraphicalPresentation
+        Difficulty = value.Difficulty, Tags = value.Tags
     };
-
-    internal static CcsDialogueNode? CurrentInterviewNode(CcsAttempt attempt, CcsCaseRevision definition)
-    {
-        var topicInterview = definition.InitialInterview;
-        if (topicInterview.Topics.Count > 0)
-        {
-            if (attempt.InterviewNodeId.Equals("complete", StringComparison.OrdinalIgnoreCase))
-                return new CcsDialogueNode
-                {
-                    Id = "complete", PatientText = topicInterview.ClosingPatientText, IsTerminal = true
-                };
-            var patientText = attempt.InterviewNodeId.Equals("opening", StringComparison.OrdinalIgnoreCase)
-                ? topicInterview.OpeningPatientText
-                : topicInterview.Topics.FirstOrDefault(value =>
-                    value.Id.Equals(attempt.InterviewNodeId, StringComparison.OrdinalIgnoreCase))?.PatientText;
-            if (string.IsNullOrWhiteSpace(patientText)) return null;
-            var visited = attempt.InterviewChoiceIds.ToHashSet(StringComparer.OrdinalIgnoreCase);
-            var choices = topicInterview.Topics.Where(value => !visited.Contains(value.Id)
-                    && value.PrerequisiteTopicIds.All(visited.Contains))
-                .Select(value => new CcsDialogueChoice
-                {
-                    Id = value.Id, Text = value.ClinicianText, NextNodeId = value.Id
-                }).ToList();
-            if (topicInterview.Topics.Where(value => value.Required).All(value => visited.Contains(value.Id)))
-                choices.Add(new CcsDialogueChoice
-                {
-                    Id = "finish_interview", Text = topicInterview.FinishChoiceText, NextNodeId = "complete"
-                });
-            return new CcsDialogueNode
-            {
-                Id = attempt.InterviewNodeId, PatientText = patientText,
-                SuppressPatientText = attempt.InterviewNodeId.Equals("opening", StringComparison.OrdinalIgnoreCase),
-                Choices = choices
-            };
-        }
-        var interview = EffectiveInterview(definition);
-        return interview.Nodes.FirstOrDefault(value =>
-            value.Id.Equals(attempt.InterviewNodeId, StringComparison.OrdinalIgnoreCase));
-    }
-
-    private static void ApplyTopicChoice(CcsAttempt attempt, CcsInitialInterview interview, string choiceId, DateTime now)
-    {
-        if (choiceId.Equals("finish_interview", StringComparison.OrdinalIgnoreCase))
-        {
-            var visited = attempt.InterviewChoiceIds.ToHashSet(StringComparer.OrdinalIgnoreCase);
-            if (!interview.Topics.Where(value => value.Required).All(value => visited.Contains(value.Id)))
-                throw new ArgumentException("Complete the core interview topics before finishing.");
-            attempt.Actions.Add(Action("dialogue_choice", "finish_interview", attempt.SimulatedMinute, now));
-            attempt.InterviewChoiceIds.Add("finish_interview");
-            attempt.InterviewNodeId = "complete";
-            attempt.OpeningCompleted = true;
-            return;
-        }
-        var topic = interview.Topics.FirstOrDefault(value => value.Id.Equals(choiceId, StringComparison.OrdinalIgnoreCase))
-            ?? throw new ArgumentException("The dialogue choice is not available at the current interview node.");
-        if (attempt.InterviewChoiceIds.Contains(topic.Id, StringComparer.OrdinalIgnoreCase))
-            throw new ArgumentException("That interview topic has already been covered.");
-        if (!topic.PrerequisiteTopicIds.All(value => attempt.InterviewChoiceIds.Contains(value, StringComparer.OrdinalIgnoreCase)))
-            throw new ArgumentException("That interview topic is not available yet.");
-        attempt.Actions.Add(Action("dialogue_choice", topic.Id, attempt.SimulatedMinute, now));
-        attempt.InterviewChoiceIds.Add(topic.Id);
-        attempt.InterviewNodeId = topic.Id;
-    }
-
-    internal static CcsInitialInterview EffectiveInterview(CcsCaseRevision definition)
-    {
-        if (!string.IsNullOrWhiteSpace(definition.InitialInterview.StartNodeId)
-            && definition.InitialInterview.Nodes.Count > 0)
-            return definition.InitialInterview;
-
-        var narrative = definition.InitialChart.HistorySections
-            .Where(value => !string.IsNullOrWhiteSpace(value.Text))
-            .Select((value, index) => new
-            {
-                Id = $"history_{index + 1}",
-                Prompt = string.IsNullOrWhiteSpace(value.Title)
-                    ? "Can you tell me more about your history?"
-                    : $"Can you tell me about your {value.Title.Trim().ToLowerInvariant()}?",
-                value.Text
-            }).ToList();
-        if (narrative.Count == 0 && !string.IsNullOrWhiteSpace(definition.InitialChart.History))
-            narrative.Add(new { Id = "history_1", Prompt = "Can you tell me more about your history?", Text = definition.InitialChart.History });
-
-        var nodes = new List<CcsDialogueNode>
-        {
-            new()
-            {
-                Id = "opening", PatientText = "Hello, doctor.", SuppressPatientText = true,
-                Choices = [new() { Id = "ask_reason", Text = "What brings you in today?", NextNodeId = "reason" }]
-            },
-            new()
-            {
-                Id = "reason", PatientText = definition.InitialChart.ReasonForEncounter,
-                Choices = [new()
-                {
-                    Id = narrative.Count > 0 ? "ask_history_1" : "finish_interview",
-                    Text = narrative.Count > 0 ? narrative[0].Prompt : "Is there anything else you would like me to know?",
-                    NextNodeId = narrative.Count > 0 ? narrative[0].Id : "complete"
-                }]
-            }
-        };
-        for (var index = 0; index < narrative.Count; index++)
-        {
-            var next = index + 1 < narrative.Count ? narrative[index + 1] : null;
-            nodes.Add(new CcsDialogueNode
-            {
-                Id = narrative[index].Id, PatientText = narrative[index].Text,
-                Choices = [new()
-                {
-                    Id = next is null ? "finish_interview" : $"ask_history_{index + 2}",
-                    Text = next?.Prompt ?? "Is there anything else you would like me to know?",
-                    NextNodeId = next?.Id ?? "complete"
-                }]
-            });
-        }
-        nodes.Add(new CcsDialogueNode
-        {
-            Id = "complete", PatientText = "That is everything I can think of, doctor.", IsTerminal = true
-        });
-        return new CcsInitialInterview { StartNodeId = "opening", Nodes = nodes };
-    }
-
-    internal static string MedicalHistory(CcsCaseRevision definition) =>
-        definition.InitialChart.HistorySections.FirstOrDefault(value =>
-            value.Code.Equals("past_medical_history", StringComparison.OrdinalIgnoreCase))?.Text ?? "";
     internal static int Rank(CcsOrderDefinition order, string query)
     {
         var values = new[] { order.CanonicalName }.Concat(order.Aliases).Select(value => value.ToLowerInvariant());

api/QuestionsApi/Services/CreditLedgerReconciliationService.cs

@@ -1,17 +0,0 @@
-namespace QuestionsApi.Services;
-
-public sealed class CreditLedgerReconciliationService(
-    CreditStore credits,
-    ILogger<CreditLedgerReconciliationService> logger) : BackgroundService
-{
-    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
-    {
-        while (!stoppingToken.IsCancellationRequested)
-        {
-            try { await credits.ReconcilePendingAsync(stoppingToken); }
-            catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested) { return; }
-            catch (Exception exception) { logger.LogError(exception, "Credit ledger reconciliation failed."); }
-            await Task.Delay(TimeSpan.FromMinutes(1), stoppingToken);
-        }
-    }
-}

api/QuestionsApi/Services/CreditStore.cs

@@ -7,167 +7,43 @@ namespace QuestionsApi.Services;
 public sealed class CreditStore
 {
     private readonly IMongoCollection<UserCreditAccount> _accounts;
-    private readonly IMongoCollection<CreditLedgerEntry> _ledger;
     private readonly TimeProvider _clock;
-    private readonly ServiceMetrics _metrics;
 
-    public CreditStore(MongoDatabaseProvider mongo, TimeProvider clock, ServiceMetrics metrics)
+    public CreditStore(MongoDatabaseProvider mongo, TimeProvider clock)
     {
         _accounts = mongo.Database.GetCollection<UserCreditAccount>("UserCreditAccounts");
-        _ledger = mongo.Database.GetCollection<CreditLedgerEntry>("CreditLedgerEntries");
         _clock = clock;
-        _metrics = metrics;
         _accounts.Indexes.CreateOne(new CreateIndexModel<UserCreditAccount>(
             Builders<UserCreditAccount>.IndexKeys.Ascending(value => value.UserId),
             new CreateIndexOptions { Unique = true, Name = "uq_credit_user" }));
-        _ledger.Indexes.CreateOne(new CreateIndexModel<CreditLedgerEntry>(
-            Builders<CreditLedgerEntry>.IndexKeys.Ascending(value => value.UserId)
-                .Descending(value => value.CreatedUtc).Descending(value => value.Id),
-            new CreateIndexOptions { Name = "credit_ledger_user_time" }));
     }
 
-    public async Task<CreditAwardResult> AwardAsync(string userId, CreditAwardRequest request)
+    public async Task<bool> AwardForFirstAnswerAsync(string userId, string attemptId)
     {
-        if (string.IsNullOrWhiteSpace(request.OperationId) || request.Amount <= 0)
-            return new CreditAwardResult { Status = await GetStatusAsync(userId) };
+        if (string.IsNullOrWhiteSpace(attemptId)) return false;
         var now = _clock.GetUtcNow().UtcDateTime;
         await EnsureAndCleanAsync(userId, now);
-        var entryId = LedgerId(userId, request.OperationId);
-        var entry = await _ledger.Find(value => value.Id == entryId).FirstOrDefaultAsync();
-        if (entry is not null && (entry.ReasonCode != request.ReasonCode || entry.SourceId != request.SourceId))
-            throw new InvalidOperationException("The credit operation ID was already used for another event.");
-        if (entry is null)
-        {
-            var alreadyApplied = await _accounts.Find(value => value.UserId == userId
-                && value.AppliedOperations.Contains(request.OperationId)).AnyAsync();
-            if (alreadyApplied) return new CreditAwardResult { Status = await GetStatusAsync(userId) };
-            entry = new CreditLedgerEntry
-            {
-                Id = entryId, UserId = userId, OperationId = request.OperationId,
-                RequestedAmount = request.Amount, Amount = request.SubjectToRollingCap ? 0 : request.Amount,
-                ReasonCode = request.ReasonCode,
-                Description = request.Description, SourceType = request.SourceType,
-                SourceId = request.SourceId, SubjectToRollingCap = request.SubjectToRollingCap,
-                CreatedUtc = now
-            };
-            try { await _ledger.InsertOneAsync(entry); }
-            catch (MongoWriteException exception) when (exception.WriteError.Category == ServerErrorCategory.DuplicateKey)
-            { entry = await _ledger.Find(value => value.Id == entryId).FirstAsync(); }
-        }
-        if (entry.State == "applied")
-        {
-            _metrics.CreditDuplicate(request.ReasonCode);
-            return new CreditAwardResult { Status = await GetStatusAsync(userId) };
-        }
 
-        var account = await _accounts.Find(value => value.UserId == userId).FirstAsync();
-        if (account.AppliedOperations.Contains(request.OperationId))
-        {
-            var appliedAmount = AppliedAmount(account, entry);
-            entry.Amount = appliedAmount;
-            await MarkLedgerAppliedAsync(entry, appliedAmount, now);
-            return new CreditAwardResult { Status = await GetStatusAsync(userId) };
-        }
-        var amount = request.Amount;
-        var appliedNow = false;
-        while (true)
-        {
-            var earned = account.RecentEarnings.Sum(value => Math.Max(1, value.CoinAmount));
-            amount = request.SubjectToRollingCap
-                ? Math.Min(request.Amount, Math.Max(0, CreditEconomy.RollingEarningLimit - earned))
-                : request.Amount;
-            var filter = Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId)
-                & Builders<UserCreditAccount>.Filter.AnyNin(value => value.AppliedOperations, [request.OperationId]);
-            if (request.SubjectToRollingCap && amount > 0)
-                filter &= RollingEarnedAtMost(CreditEconomy.RollingEarningLimit - amount);
-            var update = Builders<UserCreditAccount>.Update
-                .AddToSet(value => value.AppliedOperations, request.OperationId)
-                .Set(value => value.UpdatedUtc, now);
-            if (amount > 0)
+        var filters = Builders<UserCreditAccount>.Filter;
+        var belowCap = new BsonDocumentFilterDefinition<UserCreditAccount>(
+            new BsonDocument("$expr", new BsonDocument("$lt", new BsonArray
             {
-                update = update.Inc(value => value.Credits, amount);
-                if (request.SubjectToRollingCap)
-                    update = update.Push(value => value.RecentEarnings,
-                        new CreditEvent { OperationId = request.OperationId, CoinAmount = amount, CreatedUtc = now });
-            }
-            if ((await _accounts.UpdateOneAsync(filter, update)).ModifiedCount == 1)
-            {
-                appliedNow = true;
-                break;
-            }
-            account = await _accounts.Find(value => value.UserId == userId).FirstAsync();
-            if (account.AppliedOperations.Contains(request.OperationId))
-            {
-                amount = AppliedAmount(account, entry);
-                break;
-            }
-        }
-        entry.Amount = amount;
-        await MarkLedgerAppliedAsync(entry, amount, now);
-        if (appliedNow && amount > 0) _metrics.CreditAward(request.ReasonCode, amount);
-        if (appliedNow && request.SubjectToRollingCap && amount < request.Amount)
-            _metrics.CreditCapped(request.ReasonCode);
-        var status = await GetStatusAsync(userId);
-        return appliedNow ? Result(entry, status) : new CreditAwardResult { Status = status };
-    }
-
-    public async Task InitializeMasteryBaselineAsync(string userId, IEnumerable<string> operationIds)
-    {
-        await EnsureAndCleanAsync(userId, _clock.GetUtcNow().UtcDateTime);
+                new BsonDocument("$size", "$RecentEarnings"),
+                CreditEconomy.RollingEarningLimit
+            })));
+        var filter = filters.Eq(value => value.UserId, userId) &
+            filters.Not(filters.ElemMatch(value => value.RecentEarnings,
+                earning => earning.OperationId == attemptId)) &
+            belowCap;
         var update = Builders<UserCreditAccount>.Update
-            .Set(value => value.MasteryAwardBaselineApplied, true);
-        foreach (var operationId in operationIds.Distinct(StringComparer.Ordinal))
-            update = update.AddToSet(value => value.AppliedOperations, operationId);
-        await _accounts.UpdateOneAsync(
-            value => value.UserId == userId && !value.MasteryAwardBaselineApplied, update);
-    }
-
-    public async Task<bool> IsMasteryBaselineAppliedAsync(string userId)
-    {
-        await EnsureAndCleanAsync(userId, _clock.GetUtcNow().UtcDateTime);
-        return (await _accounts.Find(value => value.UserId == userId).FirstAsync()).MasteryAwardBaselineApplied;
-    }
-
-    public async Task<HashSet<string>> GetAppliedOperationsAsync(string userId)
-    {
-        await EnsureAndCleanAsync(userId, _clock.GetUtcNow().UtcDateTime);
-        var account = await _accounts.Find(value => value.UserId == userId).FirstAsync();
-        return account.AppliedOperations.ToHashSet(StringComparer.Ordinal);
-    }
-
-    public async Task<CreditLedgerPage> GetLedgerAsync(string userId, int limit, DateTime? before)
-    {
-        limit = Math.Clamp(limit, 1, 50);
-        var filter = Builders<CreditLedgerEntry>.Filter.Eq(value => value.UserId, userId)
-            & Builders<CreditLedgerEntry>.Filter.Eq(value => value.State, "applied")
-            & Builders<CreditLedgerEntry>.Filter.Ne(value => value.Amount, 0);
-        if (before.HasValue) filter &= Builders<CreditLedgerEntry>.Filter.Lt(value => value.CreatedUtc, before.Value);
-        var entries = await _ledger.Find(filter).SortByDescending(value => value.CreatedUtc)
-            .ThenByDescending(value => value.Id).Limit(limit + 1).ToListAsync();
-        var hasMore = entries.Count > limit;
-        if (hasMore) entries.RemoveAt(entries.Count - 1);
-        return new CreditLedgerPage
-        {
-            Items = entries.Select(value => new CreditLedgerEntryResponse
+            .Inc(value => value.Credits, 1)
+            .Push(value => value.RecentEarnings, new CreditEvent
             {
-                Amount = value.Amount, ReasonCode = value.ReasonCode,
-                Description = value.Description, CreatedUtc = value.CreatedUtc
-            }).ToList(),
-            NextBefore = hasMore && entries.Count > 0 ? entries[^1].CreatedUtc : null
-        };
-    }
-
-    public async Task ReconcilePendingAsync(CancellationToken cancellationToken = default)
-    {
-        var pending = await _ledger.Find(value => value.State == "pending")
-            .SortBy(value => value.CreatedUtc).Limit(100).ToListAsync(cancellationToken);
-        foreach (var entry in pending)
-        {
-            cancellationToken.ThrowIfCancellationRequested();
-            await AwardAsync(entry.UserId, new CreditAwardRequest(
-                entry.OperationId, entry.RequestedAmount, entry.ReasonCode, entry.Description,
-                entry.SourceType, entry.SourceId, entry.SubjectToRollingCap));
-        }
+                OperationId = attemptId,
+                CreatedUtc = now
+            })
+            .Set(value => value.UpdatedUtc, now);
+        return (await _accounts.UpdateOneAsync(filter, update)).ModifiedCount == 1;
     }
 
     public async Task<CreditStatusResponse> GetStatusAsync(string userId)
@@ -175,187 +51,15 @@ public sealed class CreditStore
         var now = _clock.GetUtcNow().UtcDateTime;
         await EnsureAndCleanAsync(userId, now);
         var account = await _accounts.Find(value => value.UserId == userId).FirstAsync();
-        return ToStatus(account);
-    }
-
-    public async Task<CreditAward?> GetAppliedAwardAsync(string userId, string operationId)
-    {
-        var entry = await _ledger.Find(value => value.Id == LedgerId(userId, operationId)
-            && value.State == "applied").FirstOrDefaultAsync();
-        return entry is null || entry.Amount <= 0 ? null : new CreditAward
+        return new CreditStatusResponse
         {
-            Amount = entry.Amount, ReasonCode = entry.ReasonCode, Description = entry.Description
+            Credits = account.Credits,
+            EarnedInRollingWindow = account.RecentEarnings.Count,
+            RemainingEarningCapacity = Math.Max(
+                0, CreditEconomy.RollingEarningLimit - account.RecentEarnings.Count)
         };
     }
 
-    public async Task<int> GetBankCycleAsync(string userId)
-    {
-        await EnsureAndCleanAsync(userId, _clock.GetUtcNow().UtcDateTime);
-        return (await _accounts.Find(value => value.UserId == userId).FirstAsync()).BankCycle;
-    }
-
-    public async Task<CreditOperationResponse> PurchaseAsync(
-        string userId, RzStoreProduct product, string operationId)
-    {
-        var now = _clock.GetUtcNow().UtcDateTime;
-        await EnsureAndCleanAsync(userId, now);
-        var existing = await _accounts.Find(value => value.UserId == userId).FirstAsync();
-        var prior = existing.Purchases.FirstOrDefault(value => value.OperationId == operationId);
-        if (prior is not null)
-        {
-            if (prior.Sku != product.Sku)
-                return Response(CreditOperationResult.OperationConflict, existing);
-            await RecordPurchaseLedgerAsync(userId, product, operationId, prior.CreatedUtc);
-            return Response(CreditOperationResult.Succeeded, existing);
-        }
-
-        var filter = Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId) &
-            Builders<UserCreditAccount>.Filter.Gte(value => value.Credits, product.CoinPrice) &
-            Builders<UserCreditAccount>.Filter.Not(
-                Builders<UserCreditAccount>.Filter.ElemMatch(
-                    value => value.Purchases, purchase => purchase.OperationId == operationId));
-        var update = Builders<UserCreditAccount>.Update
-            .Inc(value => value.Credits, -product.CoinPrice)
-            .Push(value => value.Purchases, new CreditPurchaseEvent
-            {
-                OperationId = operationId,
-                Sku = product.Sku,
-                CoinCost = product.CoinPrice,
-                CreatedUtc = now
-            })
-            .Set(value => value.UpdatedUtc, now);
-        update = product.Grant == RzStoreGrant.ExamToken
-            ? update.Inc(value => value.ExamTokens, 1)
-            : update.Inc(value => value.QBankResetTokens, 1);
-        var account = await _accounts.FindOneAndUpdateAsync(
-            filter, update, new FindOneAndUpdateOptions<UserCreditAccount>
-            {
-                ReturnDocument = ReturnDocument.After
-            });
-        if (account is not null)
-        {
-            await RecordPurchaseLedgerAsync(userId, product, operationId, now);
-            return Response(CreditOperationResult.Succeeded, account);
-        }
-
-        account = await _accounts.Find(value => value.UserId == userId).FirstAsync();
-        prior = account.Purchases.FirstOrDefault(value => value.OperationId == operationId);
-        if (prior is not null)
-        {
-            if (prior.Sku != product.Sku)
-                return Response(CreditOperationResult.OperationConflict, account);
-            await RecordPurchaseLedgerAsync(userId, product, operationId, prior.CreatedUtc);
-            return Response(CreditOperationResult.Succeeded, account);
-        }
-        return Response(CreditOperationResult.InsufficientCredits, account);
-    }
-
-    public async Task<CreditOperationResponse> ApplyQBankResetAsync(string userId, string operationId)
-    {
-        var now = _clock.GetUtcNow().UtcDateTime;
-        await EnsureAndCleanAsync(userId, now);
-        var filter = Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId) &
-            Builders<UserCreditAccount>.Filter.Gt(value => value.QBankResetTokens, 0) &
-            Builders<UserCreditAccount>.Filter.AnyNin(value => value.AppliedOperations, [operationId]);
-        var update = Builders<UserCreditAccount>.Update
-            .Inc(value => value.QBankResetTokens, -1)
-            .Inc(value => value.BankCycle, 1)
-            .AddToSet(value => value.AppliedOperations, operationId)
-            .Set(value => value.UpdatedUtc, now);
-        var account = await _accounts.FindOneAndUpdateAsync(
-            filter, update, new FindOneAndUpdateOptions<UserCreditAccount>
-            {
-                ReturnDocument = ReturnDocument.After
-            });
-        if (account is not null) return Response(CreditOperationResult.Succeeded, account);
-        account = await _accounts.Find(value => value.UserId == userId).FirstAsync();
-        if (account.AppliedOperations.Contains(operationId))
-            return Response(CreditOperationResult.Succeeded, account);
-        return Response(CreditOperationResult.InsufficientTokens, account);
-    }
-
-    public async Task<SpinResponse> SpinAsync(string userId, string operationId)
-    {
-        var now = _clock.GetUtcNow().UtcDateTime;
-        await EnsureAndCleanAsync(userId, now);
-        var existing = await _accounts.Find(value => value.UserId == userId).FirstAsync();
-        var priorSpin = existing.Spins.FirstOrDefault(value => value.OperationId == operationId);
-        if (priorSpin is not null)
-            return SpinResult(CreditOperationResult.Succeeded, existing, priorSpin);
-
-        var reward = SlotMachineEconomy.RollReward(Random.Shared.NextDouble());
-        var netCreditDelta = reward.Grant == RzStoreGrant.Coins
-            ? reward.CoinAmount - SlotMachineEconomy.SpinCost
-            : -SlotMachineEconomy.SpinCost;
-        var spinEvent = new SpinEvent
-        {
-            OperationId = operationId,
-            RewardKey = reward.Key,
-            CoinsWon = reward.Grant == RzStoreGrant.Coins ? reward.CoinAmount : 0,
-            CreatedUtc = now
-        };
-
-        var belowSpinCap = new BsonDocumentFilterDefinition<UserCreditAccount>(
-            new BsonDocument("$expr", new BsonDocument("$lt", new BsonArray
-            {
-                new BsonDocument("$size", new BsonDocument("$ifNull", new BsonArray { "$RecentSpins", new BsonArray() })),
-                SlotMachineEconomy.RollingSpinLimit
-            })));
-        var filter = Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId) &
-            Builders<UserCreditAccount>.Filter.Gte(value => value.Credits, SlotMachineEconomy.SpinCost) &
-            Builders<UserCreditAccount>.Filter.Not(
-                Builders<UserCreditAccount>.Filter.ElemMatch(
-                    value => value.Spins, spin => spin.OperationId == operationId)) &
-            belowSpinCap;
-        var update = Builders<UserCreditAccount>.Update
-            .Inc(value => value.Credits, netCreditDelta)
-            .Push(value => value.Spins, spinEvent)
-            .Push(value => value.RecentSpins, new CreditEvent { OperationId = operationId, CreatedUtc = now })
-            .Set(value => value.UpdatedUtc, now);
-        update = reward.Grant switch
-        {
-            RzStoreGrant.ExamToken => update.Inc(value => value.ExamTokens, 1),
-            RzStoreGrant.QBankResetToken => update.Inc(value => value.QBankResetTokens, 1),
-            _ => update
-        };
-        var account = await _accounts.FindOneAndUpdateAsync(
-            filter, update, new FindOneAndUpdateOptions<UserCreditAccount>
-            {
-                ReturnDocument = ReturnDocument.After
-            });
-        if (account is not null) return SpinResult(CreditOperationResult.Succeeded, account, spinEvent);
-
-        account = await _accounts.Find(value => value.UserId == userId).FirstAsync();
-        priorSpin = account.Spins.FirstOrDefault(value => value.OperationId == operationId);
-        if (priorSpin is not null) return SpinResult(CreditOperationResult.Succeeded, account, priorSpin);
-        if (account.Credits < SlotMachineEconomy.SpinCost)
-            return SpinResult(CreditOperationResult.InsufficientCredits, account, null);
-        return SpinResult(CreditOperationResult.RateLimited, account, null);
-    }
-
-    public async Task<bool> TryConsumeExamTokenAsync(string userId, string operationId)
-    {
-        var now = _clock.GetUtcNow().UtcDateTime;
-        await EnsureAndCleanAsync(userId, now);
-        var filter = Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId) &
-            Builders<UserCreditAccount>.Filter.Gt(value => value.ExamTokens, 0) &
-            Builders<UserCreditAccount>.Filter.AnyNin(value => value.AppliedOperations, [operationId]);
-        var update = Builders<UserCreditAccount>.Update
-            .Inc(value => value.ExamTokens, -1)
-            .AddToSet(value => value.AppliedOperations, operationId)
-            .Set(value => value.UpdatedUtc, now);
-        return (await _accounts.UpdateOneAsync(filter, update)).ModifiedCount == 1;
-    }
-
-    public Task RefundExamTokenAsync(string userId, string operationId) =>
-        _accounts.UpdateOneAsync(
-            Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId) &
-            Builders<UserCreditAccount>.Filter.AnyEq(value => value.AppliedOperations, operationId),
-            Builders<UserCreditAccount>.Update
-                .Inc(value => value.ExamTokens, 1)
-                .Pull(value => value.AppliedOperations, operationId)
-                .Set(value => value.UpdatedUtc, _clock.GetUtcNow().UtcDateTime));
-
     private async Task EnsureAndCleanAsync(string userId, DateTime now)
     {
         await _accounts.UpdateOneAsync(
@@ -363,130 +67,18 @@ public sealed class CreditStore
             Builders<UserCreditAccount>.Update
                 .SetOnInsert(value => value.UserId, userId)
                 .SetOnInsert(value => value.Credits, 0)
-                .SetOnInsert(value => value.ExamTokens, 1)
-                .SetOnInsert(value => value.QBankResetTokens, 0)
-                .SetOnInsert(value => value.BankCycle, 0)
-                .SetOnInsert(value => value.InitialExamGrantApplied, true)
-                .SetOnInsert(value => value.MasteryAwardBaselineApplied, false)
                 .SetOnInsert(value => value.RecentEarnings, [])
-                .SetOnInsert(value => value.Purchases, [])
-                .SetOnInsert(value => value.Spins, [])
-                .SetOnInsert(value => value.RecentSpins, [])
-                .SetOnInsert(value => value.AppliedOperations, [])
                 .SetOnInsert(value => value.UpdatedUtc, now),
             new UpdateOptions { IsUpsert = true });
-        await _accounts.UpdateOneAsync(
-            Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId) &
-            Builders<UserCreditAccount>.Filter.Ne(value => value.InitialExamGrantApplied, true),
-            Builders<UserCreditAccount>.Update
-                .Inc(value => value.ExamTokens, 1)
-                .Set(value => value.InitialExamGrantApplied, true));
         await _accounts.UpdateOneAsync(
             Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId) &
             Builders<UserCreditAccount>.Filter.Exists(nameof(UserCreditAccount.RecentEarnings), false),
             Builders<UserCreditAccount>.Update.Set(value => value.RecentEarnings, []));
-        await _accounts.UpdateOneAsync(
-            Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId) &
-            Builders<UserCreditAccount>.Filter.Exists(nameof(UserCreditAccount.Purchases), false),
-            Builders<UserCreditAccount>.Update.Set(value => value.Purchases, []));
-        await _accounts.UpdateOneAsync(
-            Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId) &
-            Builders<UserCreditAccount>.Filter.Exists(nameof(UserCreditAccount.Spins), false),
-            Builders<UserCreditAccount>.Update.Set(value => value.Spins, []));
-        await _accounts.UpdateOneAsync(
-            Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId) &
-            Builders<UserCreditAccount>.Filter.Exists(nameof(UserCreditAccount.RecentSpins), false),
-            Builders<UserCreditAccount>.Update.Set(value => value.RecentSpins, []));
-        await _accounts.UpdateOneAsync(
-            Builders<UserCreditAccount>.Filter.Eq(value => value.UserId, userId) &
-            Builders<UserCreditAccount>.Filter.Exists(nameof(UserCreditAccount.AppliedOperations), false),
-            Builders<UserCreditAccount>.Update.Set(value => value.AppliedOperations, []));
         var cutoff = now - CreditEconomy.EarningWindow;
         await _accounts.UpdateOneAsync(
             value => value.UserId == userId,
             Builders<UserCreditAccount>.Update.PullFilter(
                 value => value.RecentEarnings,
                 earning => earning.CreatedUtc <= cutoff));
-        var spinCutoff = now - SlotMachineEconomy.SpinWindow;
-        await _accounts.UpdateOneAsync(
-            value => value.UserId == userId,
-            Builders<UserCreditAccount>.Update.PullFilter(
-                value => value.RecentSpins,
-                spin => spin.CreatedUtc <= spinCutoff));
     }
-
-    private static CreditStatusResponse ToStatus(UserCreditAccount account) => new()
-    {
-        Credits = account.Credits,
-        EarnedInRollingWindow = account.RecentEarnings.Sum(value => Math.Max(1, value.CoinAmount)),
-        RemainingEarningCapacity = Math.Max(
-            0, CreditEconomy.RollingEarningLimit - account.RecentEarnings.Sum(value => Math.Max(1, value.CoinAmount))),
-        ExamTokens = account.ExamTokens,
-        QBankResetTokens = account.QBankResetTokens,
-        BankCycle = account.BankCycle
-    };
-
-    private static CreditOperationResponse Response(
-        CreditOperationResult result, UserCreditAccount account) => new()
-        {
-            Result = result,
-            Status = ToStatus(account)
-        };
-
-    private static SpinResponse SpinResult(
-        CreditOperationResult result, UserCreditAccount account, SpinEvent? spinEvent) => new()
-        {
-            Result = result,
-            RewardKey = spinEvent?.RewardKey ?? "",
-            RewardLabel = spinEvent is null ? "" : SlotMachineEconomy.FindReward(spinEvent.RewardKey)?.Label ?? "",
-            CoinsWon = spinEvent?.CoinsWon ?? 0,
-            Status = ToStatus(account)
-        };
-
-    private static string LedgerId(string userId, string operationId) => $"{userId}:{operationId}";
-
-    private static int AppliedAmount(UserCreditAccount account, CreditLedgerEntry entry) =>
-        entry.SubjectToRollingCap
-            ? account.RecentEarnings.FirstOrDefault(value => value.OperationId == entry.OperationId)?.CoinAmount ?? 0
-            : entry.RequestedAmount;
-
-    private static FilterDefinition<UserCreditAccount> RollingEarnedAtMost(int maximum) =>
-        new BsonDocumentFilterDefinition<UserCreditAccount>(new BsonDocument("$expr",
-            new BsonDocument("$lte", new BsonArray
-            {
-                new BsonDocument("$sum", new BsonDocument("$map", new BsonDocument
-                {
-                    { "input", new BsonDocument("$ifNull", new BsonArray { "$RecentEarnings", new BsonArray() }) },
-                    { "as", "earning" },
-                    { "in", new BsonDocument("$ifNull", new BsonArray { "$$earning.CoinAmount", 1 }) }
-                })),
-                maximum
-            })));
-
-    private Task MarkLedgerAppliedAsync(CreditLedgerEntry entry, int amount, DateTime now) =>
-        _ledger.UpdateOneAsync(value => value.Id == entry.Id,
-            Builders<CreditLedgerEntry>.Update.Set(value => value.Amount, amount)
-                .Set(value => value.State, "applied").Set(value => value.AppliedUtc, now));
-
-    private Task RecordPurchaseLedgerAsync(string userId, RzStoreProduct product, string operationId, DateTime createdUtc) =>
-        _ledger.ReplaceOneAsync(
-            value => value.Id == LedgerId(userId, $"purchase:{operationId}"),
-            new CreditLedgerEntry
-            {
-                Id = LedgerId(userId, $"purchase:{operationId}"), UserId = userId,
-                OperationId = $"purchase:{operationId}", RequestedAmount = -product.CoinPrice,
-                Amount = -product.CoinPrice, ReasonCode = CreditReasonCodes.Purchase,
-                Description = $"Purchased {product.Name}", SourceType = "store_product",
-                SourceId = product.Sku, State = "applied", CreatedUtc = createdUtc, AppliedUtc = createdUtc
-            },
-            new ReplaceOptions { IsUpsert = true });
-
-    private static CreditAwardResult Result(CreditLedgerEntry entry, CreditStatusResponse status) => new()
-    {
-        Award = entry.Amount <= 0 ? null : new CreditAward
-        {
-            Amount = entry.Amount, ReasonCode = entry.ReasonCode, Description = entry.Description
-        },
-        Status = status
-    };
 }

api/QuestionsApi/Services/DailyMissionStore.cs

@@ -1,203 +0,0 @@
-using MongoDB.Driver;
-using QuestionsApi.Models;
-
-namespace QuestionsApi.Services;
-
-public sealed class DailyMissionStore
-{
-    private readonly IMongoCollection<DailyMissionSet> _sets;
-    private readonly CreditStore _credits;
-    private readonly TimeProvider _clock;
-    private readonly ServiceMetrics _metrics;
-
-    public DailyMissionStore(MongoDatabaseProvider mongo, CreditStore credits, TimeProvider clock, ServiceMetrics metrics)
-    {
-        _sets = mongo.Database.GetCollection<DailyMissionSet>("DailyMissionSets");
-        _credits = credits;
-        _clock = clock;
-        _metrics = metrics;
-        _sets.Indexes.CreateOne(new CreateIndexModel<DailyMissionSet>(
-            Builders<DailyMissionSet>.IndexKeys.Ascending(value => value.UserId).Ascending(value => value.DateUtc),
-            new CreateIndexOptions { Unique = true, Name = "uq_daily_mission_user_date" }));
-    }
-
-    public async Task<DailyMissionEnvelope> GetOrCreateAsync(
-        string userId, DashboardResponse dashboard, IReadOnlyCollection<Question> published)
-    {
-        var now = _clock.GetUtcNow().UtcDateTime;
-        await RecordExpiredAsync(userId, now);
-        var key = DateKey(now);
-        var existing = await _sets.Find(value => value.UserId == userId && value.DateUtc == key).FirstOrDefaultAsync();
-        if (existing is not null) return Envelope(existing);
-        var candidates = BuildCandidates(dashboard, published, now);
-        if (candidates.Count < 3) throw new InvalidOperationException("Not enough eligible question-bank coverage to create daily missions.");
-        var set = new DailyMissionSet
-        {
-            Id = $"{userId}|{key}", UserId = userId, DateUtc = key,
-            Missions = candidates.Take(3).ToList(), ReplacementCandidates = candidates.Skip(3).ToList(),
-            CreatedUtc = now, ExpiresUtc = now.Date.AddDays(1)
-        };
-        try
-        {
-            await _sets.InsertOneAsync(set);
-            foreach (var mission in set.Missions) _metrics.DailyMissionAssigned(mission.Type);
-        }
-        catch (MongoWriteException exception) when (exception.WriteError.Category == ServerErrorCategory.DuplicateKey)
-        {
-            set = await _sets.Find(value => value.UserId == userId && value.DateUtc == key).FirstAsync();
-        }
-        return Envelope(set);
-    }
-
-    public async Task<DailyMissionEnvelope?> ReplaceAsync(string userId, string missionId)
-    {
-        var key = DateKey(_clock.GetUtcNow().UtcDateTime);
-        var set = await _sets.Find(value => value.UserId == userId && value.DateUtc == key).FirstOrDefaultAsync();
-        if (set is null) return null;
-        if (set.ReplacementUsed) throw new InvalidOperationException("Today's mission replacement has already been used.");
-        var index = set.Missions.FindIndex(value => value.Id == missionId);
-        if (index < 0) throw new ArgumentException("Mission not found.");
-        if (set.Missions[index].CompletedUtc.HasValue) throw new InvalidOperationException("Completed missions cannot be replaced.");
-        if (set.ReplacementCandidates.Count == 0) throw new InvalidOperationException("No replacement mission is available.");
-        var replacement = set.ReplacementCandidates[0];
-        replacement.StartsUtc = _clock.GetUtcNow().UtcDateTime;
-        set.Missions[index] = replacement;
-        set.ReplacementCandidates.RemoveAt(0);
-        set.ReplacementUsed = true;
-        var changed = await _sets.ReplaceOneAsync(value => value.Id == set.Id && !value.ReplacementUsed, set);
-        if (changed.ModifiedCount != 1) throw new InvalidOperationException("Today's mission replacement has already been used.");
-        _metrics.DailyMissionReplaced();
-        return Envelope(set);
-    }
-
-    public Task<DailyMissionEnvelope?> RecordQuestionAsync(string userId, QuestionAttempt attempt, Question question) =>
-        !attempt.IsCorrect || attempt.IsSkip ? Task.FromResult<DailyMissionEnvelope?>(null) :
-        RecordAsync(userId, $"question:{attempt.Id}", attempt.CreatedUtc,
-            mission => QualifiesQuestion(mission, attempt, question));
-
-    public Task<DailyMissionEnvelope?> RecordReviewAsync(string userId, QuestionReviewAttempt attempt) =>
-        !attempt.IsCorrect ? Task.FromResult<DailyMissionEnvelope?>(null) :
-        RecordAsync(userId, $"review:{attempt.Id}", attempt.CreatedUtc,
-            mission => QualifiesReview(mission, attempt));
-
-    public static bool QualifiesQuestion(DailyMission mission, QuestionAttempt attempt, Question question)
-    {
-        if (!attempt.IsCorrect || attempt.IsSkip || attempt.CreatedUtc < mission.StartsUtc) return false;
-        var system = Step3SystemCatalog.Normalize(question);
-        return mission.Type == DailyMissionTypes.WeakSystemCorrect && mission.Step3System == system
-            || mission.Type == DailyMissionTypes.DifficultyFourCorrect
-                && mission.Step3System == system && question.Difficulty >= 4;
-    }
-
-    public static bool QualifiesReview(DailyMission mission, QuestionReviewAttempt attempt) =>
-        attempt.IsCorrect && attempt.CreatedUtc >= mission.StartsUtc && mission.Type == DailyMissionTypes.DueReviews;
-
-    private async Task<DailyMissionEnvelope?> RecordAsync(
-        string userId, string eventId, DateTime eventUtc, Func<DailyMission, bool> qualifies)
-    {
-        var key = DateKey(_clock.GetUtcNow().UtcDateTime);
-        var set = await _sets.Find(value => value.UserId == userId && value.DateUtc == key).FirstOrDefaultAsync();
-        if (set is null) return null;
-        foreach (var mission in set.Missions.Where(value => value.CompletedUtc is null
-                     && value.StartsUtc <= eventUtc && qualifies(value)))
-        {
-            var missionFilter = Builders<DailyMission>.Filter.Eq(value => value.Id, mission.Id)
-                & Builders<DailyMission>.Filter.Eq(value => value.CompletedUtc, null)
-                & Builders<DailyMission>.Filter.AnyNin(value => value.AppliedEventIds, [eventId]);
-            var filter = Builders<DailyMissionSet>.Filter.Eq(value => value.Id, set.Id)
-                & Builders<DailyMissionSet>.Filter.ElemMatch(value => value.Missions, missionFilter);
-            await _sets.UpdateOneAsync(filter, Builders<DailyMissionSet>.Update
-                .Inc("Missions.$.Progress", 1).AddToSet("Missions.$.AppliedEventIds", eventId));
-        }
-        set = await _sets.Find(value => value.Id == set.Id).FirstAsync();
-        var awards = new List<CreditAward>();
-        foreach (var mission in set.Missions.Where(value => value.CompletedUtc is null && value.Progress >= value.Target))
-        {
-            var now = _clock.GetUtcNow().UtcDateTime;
-            var filter = Builders<DailyMissionSet>.Filter.Eq(value => value.Id, set.Id)
-                & Builders<DailyMissionSet>.Filter.ElemMatch(value => value.Missions,
-                    item => item.Id == mission.Id && item.CompletedUtc == null && item.Progress >= item.Target);
-            var completed = await _sets.UpdateOneAsync(filter,
-                Builders<DailyMissionSet>.Update.Set("Missions.$.CompletedUtc", now));
-            if (completed.ModifiedCount != 1) continue;
-            var award = await _credits.AwardAsync(userId, new CreditAwardRequest(
-                $"mission:{mission.Id}:complete", 3, CreditReasonCodes.DailyMissionComplete,
-                $"Completed daily mission: {mission.Title}", "daily_mission", mission.Id, true));
-            if (award.Award is not null) awards.Add(award.Award);
-            _metrics.DailyMissionCompleted(mission.Type);
-        }
-        set = await _sets.Find(value => value.Id == set.Id).FirstAsync();
-        return new DailyMissionEnvelope { State = Response(set), CreditAwards = awards };
-    }
-
-    public static List<DailyMission> BuildCandidates(
-        DashboardResponse dashboard, IReadOnlyCollection<Question> published, DateTime now)
-    {
-        var availability = published.GroupBy(Step3SystemCatalog.Normalize)
-            .Where(group => !string.IsNullOrWhiteSpace(group.Key))
-            .ToDictionary(group => group.Key!, group => (All: group.Count(), Hard: group.Count(q => q.Difficulty >= 4)));
-        var systems = dashboard.Systems.Where(value => availability.ContainsKey(value.System))
-            .OrderBy(value => MasteryRank(value.MasteryState)).ThenBy(value => value.MasteryScore)
-            .ThenBy(value => value.DistinctQuestions).ThenBy(value => value.System).ToList();
-        var result = new List<DailyMission>();
-        if (dashboard.MissedQuestionCount > 0)
-            result.Add(New(DailyMissionTypes.DueReviews,
-                $"Complete {Math.Min(10, dashboard.MissedQuestionCount)} scheduled reviews", "", 0,
-                Math.Min(10, dashboard.MissedQuestionCount), now));
-        var weak = systems.Where(value => availability[value.System].All >= 3).Select(system =>
-            New(DailyMissionTypes.WeakSystemCorrect,
-                $"Get 3 first-attempt answers correct in {system.System}", system.System, 0, 3, now));
-        var hard = systems.Where(value => availability[value.System].Hard >= 3)
-                     .OrderBy(value => value.Difficulty4PlusSuccessful).ThenBy(value => value.MasteryScore)
-            .Select(system => New(DailyMissionTypes.DifficultyFourCorrect,
-                $"Get 3 difficulty 4+ answers correct in {system.System}", system.System, 4, 3, now));
-        var weakList = weak.ToList();
-        var hardList = hard.ToList();
-        if (weakList.Count > 0) result.Add(weakList[0]);
-        var firstHard = hardList.FirstOrDefault(value => value.Step3System != weakList.FirstOrDefault()?.Step3System)
-            ?? hardList.FirstOrDefault();
-        if (firstHard is not null) result.Add(firstHard);
-        result.AddRange(weakList.Skip(1));
-        result.AddRange(hardList.Where(value => value.Id != firstHard?.Id));
-        return result.GroupBy(value => $"{value.Type}|{value.Step3System}").Select(group => group.First()).ToList();
-    }
-
-    private static DailyMission New(string type, string title, string system, int difficulty, int target, DateTime now) =>
-        new() { Type = type, Title = title, Step3System = system, DifficultyMin = difficulty,
-            Target = target, StartsUtc = now };
-
-    private static int MasteryRank(string state) => state switch
-    {
-        MasteryStates.Unseen => 0, MasteryStates.Learning => 1, MasteryStates.Practicing => 2,
-        MasteryStates.Strong => 3, _ => 4
-    };
-
-    private static string DateKey(DateTime now) => now.ToString("yyyy-MM-dd", System.Globalization.CultureInfo.InvariantCulture);
-
-    private async Task RecordExpiredAsync(string userId, DateTime now)
-    {
-        var expired = await _sets.Find(value => value.UserId == userId && value.ExpiresUtc <= now
-            && !value.ExpirationRecorded).ToListAsync();
-        foreach (var set in expired)
-        {
-            var changed = await _sets.UpdateOneAsync(value => value.Id == set.Id && !value.ExpirationRecorded,
-                Builders<DailyMissionSet>.Update.Set(value => value.ExpirationRecorded, true));
-            if (changed.ModifiedCount != 1) continue;
-            foreach (var mission in set.Missions.Where(value => value.CompletedUtc is null))
-                _metrics.DailyMissionExpired(mission.Type);
-        }
-    }
-    private static DailyMissionEnvelope Envelope(DailyMissionSet set) => new() { State = Response(set) };
-    private static DailyMissionSetResponse Response(DailyMissionSet set) => new()
-    {
-        DateUtc = set.DateUtc, ExpiresUtc = set.ExpiresUtc,
-        ReplacementAvailable = !set.ReplacementUsed && set.ReplacementCandidates.Count > 0
-            && set.Missions.Any(value => value.CompletedUtc is null),
-        Missions = set.Missions.Select(value => new DailyMissionResponse
-        {
-            Id = value.Id, Type = value.Type, Title = value.Title, Step3System = value.Step3System,
-            DifficultyMin = value.DifficultyMin, Target = value.Target,
-            Progress = Math.Min(value.Progress, value.Target), Completed = value.CompletedUtc.HasValue
-        }).ToList()
-    };
-}

api/QuestionsApi/Services/DashboardStore.cs

@@ -22,7 +22,23 @@ public sealed class DashboardStore
     private readonly CcsRatingStore _ccsRatingStore;
     private readonly IMongoCollection<UserRating> _ratings;
 
-    public static readonly string[] Step3Systems = Step3SystemCatalog.All;
+    public static readonly string[] Step3Systems =
+    [
+        "Human Development",
+        "Immune System, Blood & Lymphoreticular System, and Multisystem Processes/Disorders",
+        "Behavioral Health",
+        "Nervous System & Special Senses",
+        "Skin & Subcutaneous Tissue",
+        "Musculoskeletal System",
+        "Cardiovascular System",
+        "Respiratory System",
+        "Gastrointestinal System",
+        "Renal/Urinary & Male Reproductive Systems",
+        "Pregnancy/Childbirth & Female Reproductive System & Breast",
+        "Endocrine System",
+        "Biostatistics & Epidemiology/Population Health & Interpretation of the Medical Literature",
+        "Social Sciences: Communication Skills/Ethics/Patient Safety"
+    ];
 
     public DashboardStore(
         MongoDatabaseProvider mongo,
@@ -53,7 +69,6 @@ public sealed class DashboardStore
 
     public async Task<DashboardResponse> GetAsync(string userId, DateTime nowUtc)
     {
-        await _reviewQueue.EnsureUserQueueAsync(userId);
         var today = nowUtc.Date;
         var trendStart = today.AddDays(-29);
         var weekStart = today.AddDays(-6);
@@ -71,25 +86,22 @@ public sealed class DashboardStore
         var bookmarkCountTask = _bookmarks.CountDocumentsAsync(value => value.UserId == userId);
         var notepadTask = _notes.Find(value => value.UserId == userId).FirstOrDefaultAsync();
         var reviewAttemptsTask = _reviewQueue.GetReviewsSinceAsync(userId, weekStart);
-        var allReviewAttemptsTask = _reviewQueue.GetUserReviewsAsync(userId);
-        var reviewItemsTask = _reviewQueue.GetUserItemsAsync(userId);
         var flashcardCountsTask = _flashcards.GetDashboardCountsAsync(userId, nowUtc, weekStart);
         var flashcardReviewsTask = _flashcardSchedules.GetReviewsSinceAsync(userId, weekStart);
         var dynamicReviewsTask = _dynamicQuestions.DueReviewsAsync(userId, nowUtc);
         await Task.WhenAll(attemptsTask, ratingTask, ccsRatingTask, ccsAttemptsTask, ccsAllAttemptsTask, completedCcsCountTask,
             simulationsTask, completedSimulationsTask, bookmarkCountTask, notepadTask, reviewAttemptsTask, flashcardCountsTask,
-            flashcardReviewsTask, dynamicReviewsTask, allReviewAttemptsTask, reviewItemsTask);
+            flashcardReviewsTask, dynamicReviewsTask);
 
         var attempts = attemptsTask.Result;
         var answeredAttempts = attempts.Where(value => !value.IsSkip).ToList();
         var recentAnswered = answeredAttempts.OrderByDescending(value => value.CreatedUtc).Take(100).ToList();
         var previousHundred = answeredAttempts.OrderByDescending(value => value.CreatedUtc).Skip(100).Take(100).ToList();
-        var questionMap = await _questions.GetByExternalIdsAsync(attempts.Select(value => value.QuestionExternalId)
-            .Concat(reviewItemsTask.Result.Select(value => value.QuestionExternalId))
-            .Concat(allReviewAttemptsTask.Result.Select(value => value.QuestionExternalId)));
+        var questionMap = await _questions.GetByExternalIdsAsync(attempts.Select(value => value.QuestionExternalId));
         var ccsAttempts = ccsAttemptsTask.Result;
         var simulations = simulationsTask.Result;
         var completedCcs = ccsAttempts.Where(value => value.State == CcsAttemptStates.Completed && value.CompletedUtc.HasValue).ToList();
+        await _reviewQueue.EnsureUserQueueAsync(userId);
         var pendingReviewCount = await _reviewQueue.CountPendingAsync(userId);
 
         var qbankElo = ratingTask.Result.OverallElo;
@@ -136,8 +148,7 @@ public sealed class DashboardStore
         };
 
         response.PerformanceTrend = performanceTrend;
-        response.Systems = MasteryCalculator.Calculate(
-            attempts, allReviewAttemptsTask.Result, reviewItemsTask.Result, questionMap, nowUtc);
+        response.Systems = BuildSystemPerformance(answeredAttempts, questionMap);
 
         response.WeeklyActivity = Enumerable.Range(0, 7).Select(offset =>
         {
@@ -292,10 +303,59 @@ public sealed class DashboardStore
     }
 
     public static string? NormalizeStep3System(Question question)
-        => Step3SystemCatalog.Normalize(question);
+    {
+        foreach (var candidate in new[] { question.System, question.PerformanceCategory, question.Discipline })
+        {
+            var normalized = NormalizeStep3System(candidate);
+            if (normalized is not null)
+                return normalized;
+        }
+        return null;
+    }
 
     public static string? NormalizeStep3System(string? value)
-        => Step3SystemCatalog.Normalize(value);
+    {
+        if (string.IsNullOrWhiteSpace(value))
+            return null;
+        var exact = Step3Systems.FirstOrDefault(
+            system => string.Equals(system, value.Trim(), StringComparison.OrdinalIgnoreCase));
+        if (exact is not null)
+            return exact;
+
+        var lower = value.Trim().ToLowerInvariant();
+        if (ContainsAny(lower, "human development", "well patient", "preventive", "health maintenance", "geriatr", "age-related"))
+            return Step3Systems[0];
+        if (ContainsAny(lower, "social science", "communication", "ethic", "patient safety", "professionalism", "systems-based"))
+            return Step3Systems[13];
+        if (ContainsAny(lower, "pregnan", "obstetric", "gynec", "female reproductive", "breast", "puerper"))
+            return Step3Systems[10];
+        if (ContainsAny(lower, "renal", "urinary", "male reproductive", "urolog", "nephro"))
+            return Step3Systems[9];
+        if (ContainsAny(lower, "biostat", "epidemi", "population health", "medical literature"))
+            return Step3Systems[12];
+        if (ContainsAny(lower, "immune", "immun", "blood", "hemat", "lymph", "multisystem", "infectious"))
+            return Step3Systems[1];
+        if (ContainsAny(lower, "behavior", "psychi", "mental health"))
+            return Step3Systems[2];
+        if (ContainsAny(lower, "nervous", "neuro", "special sense", "ophthalm", "otolaryng", " ent"))
+            return Step3Systems[3];
+        if (ContainsAny(lower, "skin", "derm", "subcutaneous"))
+            return Step3Systems[4];
+        if (ContainsAny(lower, "musculo", "orthop", "rheumat"))
+            return Step3Systems[5];
+        if (ContainsAny(lower, "cardio", "circulatory"))
+            return Step3Systems[6];
+        if (ContainsAny(lower, "resp", "pulmon"))
+            return Step3Systems[7];
+        if (ContainsAny(lower, "gastro", "digest", "hepato"))
+            return Step3Systems[8];
+        if (ContainsAny(lower, "endocr", "metabolic"))
+            return Step3Systems[11];
+        return null;
+    }
+
+    private static bool ContainsAny(string value, params string[] fragments) =>
+        fragments.Any(value.Contains);
 
     private async Task<List<DashboardRecentActivity>> BuildRecentActivityAsync(
         List<QuestionAttempt> attempts,

api/QuestionsApi/Services/DynamicQuestionGenerator.cs

@@ -283,8 +283,7 @@ public sealed class DynamicQuestionGenerator
         IReadOnlyDictionary<string, string> values)
     {
         var result = new Dictionary<string, WrongAnswerFollowup>();
-        var distractorList = distractors.ToList();
-        foreach (var distractor in distractorList)
+        foreach (var distractor in distractors)
         {
             if (templates.TryGetValue(distractor.Id, out var template))
             {
@@ -298,18 +297,16 @@ public sealed class DynamicQuestionGenerator
                 };
                 continue;
             }
-            var alternatives = distractorList.Where(value => value.Id != distractor.Id).Take(2).ToArray();
             result[distractor.Id] = new WrongAnswerFollowup
             {
-                Prompt = $"Which limitation of option {distractor.Id} should have ruled it out in this case?",
+                Prompt = "Which option best addresses the decisive finding in this case?",
                 Choices =
                 [
-                    new QuestionChoice { Id = "A", Text = Render(distractor.ExplanationTemplate, values) },
-                    new QuestionChoice { Id = "B", Text = Render(alternatives[0].ExplanationTemplate, values) },
-                    new QuestionChoice { Id = "C", Text = Render(alternatives[1].ExplanationTemplate, values) }
+                    new QuestionChoice { Id = correct.Id, Text = Render(correct.TextTemplate, values) },
+                    new QuestionChoice { Id = distractor.Id, Text = Render(distractor.TextTemplate, values) }
                 ],
-                CorrectChoiceId = "A",
-                TeachingPoint = Render(distractor.ExplanationTemplate, values)
+                CorrectChoiceId = correct.Id,
+                TeachingPoint = $"{Render(distractor.ExplanationTemplate, values)} {Render(correct.ExplanationTemplate, values)}"
             };
         }
         return result;

api/QuestionsApi/Services/ExamSimulationScoring.cs

@@ -4,35 +4,33 @@ namespace QuestionsApi.Services;
 
 public static class ExamSimulationScoring
 {
-    public const string ModelVersion = "provisional-2";
-    private const double PassingAccuracy = 0.60;
-    private const double ScoreIntercept = 50.0;
-    private const double ScoreScale = 250.0;
+    public const string ModelVersion = "provisional-1";
+    private const double PriorMean = 1000.0;
+    private const double PriorSd = 400.0;
 
     public static ExamSimulationScore Calculate(
         IReadOnlyList<ExamSimulationItem> items,
         IReadOnlyDictionary<string, ExamSimulationResponse> responses,
         IReadOnlyDictionary<string, Question> questions)
     {
+        var ability = EstimateAbility(items, responses, questions);
+        var predicted = Math.Clamp((int)Math.Round(227.0 + (ability - 1000.0) * 15.0 / 200.0), 1, 300);
+        var information = 1.0 / (PriorSd * PriorSd);
         var correct = 0;
         var seen = 0;
-        var weightedCorrect = 0.0;
-        var weightSum = 0.0;
-        var squaredWeightSum = 0.0;
         var categories = new Dictionary<string, ExamSimulationCategoryScore>();
 
         foreach (var item in items)
         {
-            questions.TryGetValue(item.QuestionExternalId, out var question);
+            if (!questions.TryGetValue(item.QuestionExternalId, out var question))
+                continue;
             responses.TryGetValue(item.QuestionExternalId, out var response);
-            var isCorrect = question is not null && response?.ChoiceId == question.CorrectChoiceId;
+            var isCorrect = response?.ChoiceId == question.CorrectChoiceId;
             if (isCorrect) correct++;
             if (item.WasSeen) seen++;
-            var difficulty = ResolveDifficulty(item, question);
-            var weight = DifficultyWeight(difficulty);
-            weightSum += weight;
-            squaredWeightSum += weight * weight;
-            if (isCorrect) weightedCorrect += weight;
+            var weight = item.WasSeen ? 0.5 : 1.0;
+            var probability = Expected(ability, item.QuestionElo);
+            information += weight * probability * (1.0 - probability) * Math.Pow(Math.Log(10.0) / 400.0, 2);
             if (!categories.TryGetValue(item.BlueprintCategory, out var category))
             {
                 category = new ExamSimulationCategoryScore();
@@ -42,53 +40,51 @@ public static class ExamSimulationScoring
             if (isCorrect) category.Correct++;
         }
 
-        var rawAccuracy = items.Count == 0 ? 0.0 : (double)correct / items.Count;
-        var adjustedAccuracy = weightSum == 0.0 ? 0.0 : weightedCorrect / weightSum;
-        var predicted = ToScore(adjustedAccuracy);
-        var effectiveSampleSize = squaredWeightSum == 0.0 ? 0.0 : weightSum * weightSum / squaredWeightSum;
-        var accuracySe = effectiveSampleSize == 0.0
-            ? 0.0
-            : Math.Sqrt(adjustedAccuracy * (1.0 - adjustedAccuracy) / effectiveSampleSize);
-        var accuracyMargin = 1.96 * accuracySe;
-        var rangeLow = ToScore(Math.Clamp(adjustedAccuracy - accuracyMargin, 0.0, 1.0));
-        var rangeHigh = ToScore(Math.Clamp(adjustedAccuracy + accuracyMargin, 0.0, 1.0));
-        var passProbability = accuracySe == 0.0
-            ? adjustedAccuracy >= PassingAccuracy ? 1.0 : 0.0
-            : NormalCdf((adjustedAccuracy - PassingAccuracy) / accuracySe);
+        var abilitySe = Math.Sqrt(1.0 / information);
+        var scoreSe = abilitySe * 15.0 / 200.0;
+        var combinedSe = Math.Sqrt(7.0 * 7.0 + 15.0 * 15.0 + scoreSe * scoreSe);
+        var range = (int)Math.Ceiling(combinedSe);
+        var passProbability = NormalCdf((predicted - 200.0) / combinedSe);
         return new ExamSimulationScore
         {
             PredictedScore = predicted,
-            RangeLow = rangeLow,
-            RangeHigh = rangeHigh,
+            RangeLow = Math.Clamp(predicted - range, 1, 300),
+            RangeHigh = Math.Clamp(predicted + range, 1, 300),
             PassProbability = Math.Round(passProbability, 4),
             Correct = correct,
             Total = items.Count,
             SeenCount = seen,
-            RawAccuracy = Math.Round(rawAccuracy, 4),
-            DifficultyAdjustedAccuracy = Math.Round(adjustedAccuracy, 4),
-            AbilityElo = null,
+            AbilityElo = Math.Round(ability, 1),
             Categories = categories
         };
     }
 
-    public static int ResolveDifficulty(ExamSimulationItem item, Question? question = null)
+    private static double EstimateAbility(
+        IReadOnlyList<ExamSimulationItem> items,
+        IReadOnlyDictionary<string, ExamSimulationResponse> responses,
+        IReadOnlyDictionary<string, Question> questions)
     {
-        if (item.QuestionDifficulty is >= 1 and <= 5) return item.QuestionDifficulty;
-        return question?.Difficulty is >= 1 and <= 5 ? question.Difficulty : 3;
+        var low = 100.0;
+        var high = 1900.0;
+        for (var iteration = 0; iteration < 80; iteration++)
+        {
+            var ability = (low + high) / 2.0;
+            var derivative = -(ability - PriorMean) / (PriorSd * PriorSd);
+            foreach (var item in items)
+            {
+                if (!questions.TryGetValue(item.QuestionExternalId, out var question)) continue;
+                responses.TryGetValue(item.QuestionExternalId, out var response);
+                var actual = response?.ChoiceId == question.CorrectChoiceId ? 1.0 : 0.0;
+                var weight = item.WasSeen ? 0.5 : 1.0;
+                derivative += weight * (actual - Expected(ability, item.QuestionElo)) * Math.Log(10.0) / 400.0;
+            }
+            if (derivative > 0) low = ability; else high = ability;
+        }
+        return (low + high) / 2.0;
     }
 
-    private static double DifficultyWeight(int difficulty) => difficulty switch
-    {
-        1 => 0.8,
-        2 => 0.9,
-        3 => 1.0,
-        4 => 1.1,
-        5 => 1.2,
-        _ => 1.0
-    };
-
-    private static int ToScore(double accuracy) =>
-        Math.Clamp((int)Math.Round(ScoreIntercept + ScoreScale * accuracy), 1, 300);
+    private static double Expected(double ability, int difficulty) =>
+        1.0 / (1.0 + Math.Pow(10.0, (difficulty - ability) / 400.0));
 
     private static double NormalCdf(double value) => 0.5 * (1.0 + Erf(value / Math.Sqrt(2.0)));
 

api/QuestionsApi/Services/ExamSimulationScoringMigrationService.cs

@@ -1,37 +0,0 @@
-namespace QuestionsApi.Services;
-
-public sealed class ExamSimulationScoringMigrationService : BackgroundService
-{
-    private readonly ExamSimulationStore _simulations;
-    private readonly ILogger<ExamSimulationScoringMigrationService> _logger;
-
-    public ExamSimulationScoringMigrationService(
-        ExamSimulationStore simulations,
-        ILogger<ExamSimulationScoringMigrationService> logger)
-    {
-        _simulations = simulations;
-        _logger = logger;
-    }
-
-    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
-    {
-        try
-        {
-            var result = await _simulations.BackfillScoringModelAsync(stoppingToken);
-            _logger.LogInformation(
-                "Exam simulation scoring migration completed; recalculated {UpdatedCount} simulation(s)",
-                result.UpdatedCount);
-            foreach (var reference in result.MissingQuestionIds)
-                _logger.LogWarning(
-                    "Exam simulation scoring migration used neutral difficulty for missing question {Reference}",
-                    reference);
-        }
-        catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
-        {
-        }
-        catch (Exception exception)
-        {
-            _logger.LogError(exception, "Exam simulation scoring migration failed");
-        }
-    }
-}

api/QuestionsApi/Services/ExamSimulationStore.cs

@@ -13,7 +13,6 @@ public class ExamSimulationStore
     private readonly IMongoCollection<Step3Outcome> _outcomes;
     private readonly QuestionStore _questions;
     private readonly QuestionAttemptStore _attempts;
-    private readonly CreditStore _credits;
     private readonly AnswerStatisticsStore _statistics;
     private readonly RatingStore _ratings;
     private readonly ServiceMetrics _metrics;
@@ -23,7 +22,6 @@ public class ExamSimulationStore
         MongoDatabaseProvider mongo,
         QuestionStore questions,
         QuestionAttemptStore attempts,
-        CreditStore credits,
         AnswerStatisticsStore statistics,
         RatingStore ratings,
         ServiceMetrics metrics,
@@ -33,7 +31,6 @@ public class ExamSimulationStore
         _outcomes = mongo.Database.GetCollection<Step3Outcome>("Step3Outcomes");
         _questions = questions;
         _attempts = attempts;
-        _credits = credits;
         _statistics = statistics;
         _ratings = ratings;
         _metrics = metrics;
@@ -71,8 +68,7 @@ public class ExamSimulationStore
         var bank = (await _questions.GetPublishedAsync()).Where(question => question.Choices.Count >= 5).ToList();
         if (bank.Count < RequiredQuestions)
             throw new InvalidOperationException($"At least {RequiredQuestions} published questions are required.");
-        var bankCycle = await _credits.GetBankCycleAsync(userId);
-        var seen = (await _attempts.GetUserQuestionIdsAsync(userId, bankCycle)).ToHashSet(StringComparer.Ordinal);
+        var seen = (await _attempts.GetUserQuestionIdsAsync(userId)).ToHashSet(StringComparer.Ordinal);
         var elos = await _ratings.GetQuestionElosAsync(bank.Select(question => question.ExternalId));
         var targets = BuildTargets();
         var selected = SelectForm(bank, seen, targets);
@@ -91,7 +87,6 @@ public class ExamSimulationStore
                     Position = offset,
                     PresentedChoiceIds = SelectChoices(question, choicePercentages.GetValueOrDefault(question.ExternalId)),
                     QuestionElo = elos.GetValueOrDefault(question.ExternalId, 1000),
-                    QuestionDifficulty = question.Difficulty,
                     WasSeen = seen.Contains(question.ExternalId),
                     BlueprintCategory = BlueprintCategory(question)
                 });
@@ -129,7 +124,6 @@ public class ExamSimulationStore
             Position = PositionWithinBlock(index),
             PresentedChoiceIds = SelectChoices(question, choicePercentages.GetValueOrDefault(question.ExternalId)),
             QuestionElo = 1000,
-            QuestionDifficulty = question.Difficulty,
             WasSeen = false,
             BlueprintCategory = BlueprintCategory(question)
         }).ToList();
@@ -175,22 +169,15 @@ public class ExamSimulationStore
             (item.State == ExamSimulationStates.BetweenBlocks || item.State == ExamSimulationStates.BlockActive))
             .SortByDescending(item => item.UpdatedUtc).FirstOrDefaultAsync();
 
-    public async Task<ExamSimulationScore?> GetLatestCompletedScoreAsync(string userId)
-    {
-        var simulation = await _simulations
-            .Find(item => item.UserId == userId && item.State == ExamSimulationStates.Completed && item.Score != null)
-            .SortByDescending(item => item.CompletedUtc)
-            .FirstOrDefaultAsync();
-        return simulation is null ? null : (await UpgradeScoringModelAsync(simulation)).Score;
-    }
+    public async Task<ExamSimulationScore?> GetLatestCompletedScoreAsync(string userId) =>
+        (await _simulations.Find(item => item.UserId == userId && item.State == ExamSimulationStates.Completed && item.Score != null)
+            .SortByDescending(item => item.CompletedUtc).FirstOrDefaultAsync())?.Score;
 
     public async Task<ExamSimulation?> GetOwnedAsync(string id, string userId)
     {
         var simulation = await _simulations.Find(item => item.Id == id && item.UserId == userId).FirstOrDefaultAsync();
         if (simulation is not null && simulation.State == ExamSimulationStates.BlockActive && simulation.BlockDeadlineUtc <= DateTime.UtcNow)
             simulation = await SubmitBlockAsync(simulation, true);
-        if (simulation is not null)
-            simulation = await UpgradeScoringModelAsync(simulation);
         return simulation;
     }
 
@@ -204,7 +191,6 @@ public class ExamSimulationStore
         var simulations = await _simulations.Find(filter).SortByDescending(item => item.CompletedUtc).Limit(limit + 1).ToListAsync();
         var hasMore = simulations.Count > limit;
         if (hasMore) simulations.RemoveAt(simulations.Count - 1);
-        await UpgradeScoringModelsAsync(simulations);
         return new CompletedExamSimulationPage
         {
             Items = simulations.Select(item => new CompletedExamSimulationSummary
@@ -271,7 +257,6 @@ public class ExamSimulationStore
         var simulations = await _simulations.Find(filter).Sort(sortDefinition).Limit(limit + 1).ToListAsync();
         var hasMore = simulations.Count > limit;
         if (hasMore) simulations.RemoveAt(simulations.Count - 1);
-        await UpgradeScoringModelsAsync(simulations.Where(item => item.State == ExamSimulationStates.Completed));
         var last = simulations.LastOrDefault();
         return new ExamSimulationHistoryPage
         {
@@ -348,53 +333,23 @@ public class ExamSimulationStore
         if (!item.PresentedChoiceIds.Contains(request.ChoiceId, StringComparer.Ordinal) && request.ChoiceId != "")
             throw new ArgumentException("Choice is not presented for this question.");
         var response = simulation.Responses.FirstOrDefault(candidate => candidate.QuestionExternalId == request.QuestionExternalId);
-        if (response is not null && IsResponseLocked(response))
-        {
-            if (ResponseContentMatches(response, request, item.PresentedChoiceIds))
-                return simulation;
-            throw new InvalidOperationException("A submitted simulation answer cannot be changed.");
-        }
         if (response is null)
         {
-            response = new ExamSimulationResponse
-            {
-                QuestionExternalId = request.QuestionExternalId,
-                IsSubmitted = false
-            };
+            response = new ExamSimulationResponse { QuestionExternalId = request.QuestionExternalId };
             simulation.Responses.Add(response);
         }
         response.ChoiceId = request.ChoiceId;
         response.EliminatedChoiceIds = request.EliminatedChoiceIds.Where(item.PresentedChoiceIds.Contains).Distinct().ToList();
         response.Flagged = request.Flagged;
         response.ElapsedSeconds = Math.Clamp(request.ElapsedSeconds, 0, 1800);
-        response.IsSubmitted = request.IsSubmitted;
         response.UpdatedUtc = DateTime.UtcNow;
         simulation.UpdatedUtc = DateTime.UtcNow;
         await ReplaceAsync(simulation);
         return simulation;
     }
 
-    public static bool IsResponseLocked(ExamSimulationResponse response) =>
-        response.IsSubmitted == true ||
-        (response.IsSubmitted is null && !string.IsNullOrEmpty(response.ChoiceId));
-
-    public static bool ResponseContentMatches(
-        ExamSimulationResponse response,
-        SaveSimulationResponseRequest request,
-        IReadOnlyCollection<string> presentedChoiceIds)
-    {
-        var eliminated = request.EliminatedChoiceIds
-            .Where(presentedChoiceIds.Contains)
-            .ToHashSet(StringComparer.Ordinal);
-        return response.ChoiceId == request.ChoiceId &&
-            response.Flagged == request.Flagged &&
-            response.EliminatedChoiceIds.ToHashSet(StringComparer.Ordinal).SetEquals(eliminated);
-    }
-
     public async Task<ExamSimulation> SubmitBlockAsync(ExamSimulation simulation, bool expired = false)
     {
-        if (IsAlreadySubmittedState(simulation.State))
-            return simulation;
         if (simulation.State != ExamSimulationStates.BlockActive)
             throw new InvalidOperationException("There is no active block to submit.");
         if (!expired && simulation.BlockDeadlineUtc is not null)
@@ -411,9 +366,6 @@ public class ExamSimulationStore
         return simulation;
     }
 
-    public static bool IsAlreadySubmittedState(string state) =>
-        state is ExamSimulationStates.BetweenBlocks or ExamSimulationStates.Completed;
-
     public async Task AbandonAsync(ExamSimulation simulation)
     {
         simulation.State = ExamSimulationStates.Abandoned;
@@ -481,9 +433,7 @@ public class ExamSimulationStore
     {
         var questionMap = await _questions.GetByExternalIdsAsync(simulation.Items.Select(item => item.QuestionExternalId));
         var responses = simulation.Responses.ToDictionary(item => item.QuestionExternalId, StringComparer.Ordinal);
-        SnapshotDifficulties(simulation, questionMap);
         simulation.Score = ExamSimulationScoring.Calculate(simulation.Items, responses, questionMap);
-        simulation.ModelVersion = ExamSimulationScoring.ModelVersion;
         simulation.State = ExamSimulationStates.Completed;
         simulation.CompletedUtc = DateTime.UtcNow;
         simulation.UpdatedUtc = DateTime.UtcNow;
@@ -493,10 +443,7 @@ public class ExamSimulationStore
             if (!questionMap.TryGetValue(item.QuestionExternalId, out var question)) continue;
             responses.TryGetValue(item.QuestionExternalId, out var response);
             var choiceId = response?.ChoiceId ?? "";
-            var record = await _attempts.RecordFirstAttemptAsync(
-                item.QuestionExternalId, simulation.UserId, choiceId,
-                choiceId == question.CorrectChoiceId, choiceId == "",
-                item.PresentedChoiceIds, bankCycle: await _credits.GetBankCycleAsync(simulation.UserId));
+            var record = await _attempts.RecordFirstAttemptAsync(item.QuestionExternalId, simulation.UserId, choiceId, choiceId == question.CorrectChoiceId, choiceId == "", item.PresentedChoiceIds);
             await _reviewQueue.AddFromFirstAttemptAsync(record.Attempt);
             if (!record.Inserted) continue;
             _metrics.AttemptCreated();
@@ -521,71 +468,6 @@ public class ExamSimulationStore
     private Task ReplaceAsync(ExamSimulation simulation) =>
         _simulations.ReplaceOneAsync(item => item.Id == simulation.Id && item.UserId == simulation.UserId, simulation);
 
-    public async Task<ExamSimulationBackfillResult> BackfillScoringModelAsync(CancellationToken cancellationToken = default)
-    {
-        var filter = Builders<ExamSimulation>.Filter.Eq(item => item.State, ExamSimulationStates.Completed) &
-            Builders<ExamSimulation>.Filter.Ne(item => item.ModelVersion, ExamSimulationScoring.ModelVersion);
-        var simulations = await _simulations.Find(filter).ToListAsync(cancellationToken);
-        var missingQuestionIds = new List<string>();
-        var updated = 0;
-        foreach (var simulation in simulations)
-        {
-            cancellationToken.ThrowIfCancellationRequested();
-            var questionMap = await _questions.GetByExternalIdsAsync(simulation.Items.Select(item => item.QuestionExternalId));
-            missingQuestionIds.AddRange(simulation.Items
-                .Where(item => !questionMap.ContainsKey(item.QuestionExternalId))
-                .Select(item => $"{simulation.Id}:{item.QuestionExternalId}"));
-            SnapshotDifficulties(simulation, questionMap);
-            var responses = simulation.Responses.ToDictionary(item => item.QuestionExternalId, StringComparer.Ordinal);
-            simulation.Score = ExamSimulationScoring.Calculate(simulation.Items, responses, questionMap);
-            simulation.ModelVersion = ExamSimulationScoring.ModelVersion;
-            simulation.UpdatedUtc = DateTime.UtcNow;
-            await ReplaceAsync(simulation);
-            updated++;
-        }
-        return new ExamSimulationBackfillResult(updated, missingQuestionIds);
-    }
-
-    private async Task UpgradeScoringModelsAsync(IEnumerable<ExamSimulation> simulations)
-    {
-        foreach (var simulation in simulations)
-            await UpgradeScoringModelAsync(simulation);
-    }
-
-    private async Task<ExamSimulation> UpgradeScoringModelAsync(ExamSimulation simulation)
-    {
-        var needsDifficultySnapshot = simulation.Items.Any(item => item.QuestionDifficulty is < 1 or > 5);
-        var needsScoreUpgrade = simulation.State == ExamSimulationStates.Completed &&
-            simulation.ModelVersion != ExamSimulationScoring.ModelVersion;
-        if (!needsDifficultySnapshot && !needsScoreUpgrade)
-            return simulation;
-
-        var questionMap = await _questions.GetByExternalIdsAsync(simulation.Items.Select(item => item.QuestionExternalId));
-        SnapshotDifficulties(simulation, questionMap);
-        if (simulation.State == ExamSimulationStates.Completed)
-        {
-            var responses = simulation.Responses.ToDictionary(item => item.QuestionExternalId, StringComparer.Ordinal);
-            simulation.Score = ExamSimulationScoring.Calculate(simulation.Items, responses, questionMap);
-        }
-        simulation.ModelVersion = ExamSimulationScoring.ModelVersion;
-        simulation.UpdatedUtc = DateTime.UtcNow;
-        await ReplaceAsync(simulation);
-        return simulation;
-    }
-
-    private static void SnapshotDifficulties(
-        ExamSimulation simulation,
-        IReadOnlyDictionary<string, Question> questions)
-    {
-        foreach (var item in simulation.Items)
-        {
-            questions.TryGetValue(item.QuestionExternalId, out var question);
-            item.QuestionDifficulty = ExamSimulationScoring.ResolveDifficulty(item, question);
-        }
-    }
-
-    public sealed record ExamSimulationBackfillResult(int UpdatedCount, IReadOnlyList<string> MissingQuestionIds);
-
     private static int BlockIndexForPosition(int position)
     {
         var consumed = 0;

api/QuestionsApi/Services/MasteryAwardService.cs

@@ -1,86 +0,0 @@
-using MongoDB.Driver;
-using QuestionsApi.Models;
-
-namespace QuestionsApi.Services;
-
-public sealed class MasteryAwardService
-{
-    private readonly IMongoCollection<QuestionAttempt> _attempts;
-    private readonly IMongoCollection<QuestionReviewAttempt> _reviews;
-    private readonly IMongoCollection<ReviewQueueItem> _queue;
-    private readonly QuestionStore _questions;
-    private readonly CreditStore _credits;
-    private readonly TimeProvider _clock;
-
-    public MasteryAwardService(MongoDatabaseProvider mongo, QuestionStore questions, CreditStore credits, TimeProvider clock)
-    {
-        _attempts = mongo.Database.GetCollection<QuestionAttempt>("QuestionAttempts");
-        _reviews = mongo.Database.GetCollection<QuestionReviewAttempt>("QuestionReviewAttempts");
-        _queue = mongo.Database.GetCollection<ReviewQueueItem>("ReviewQueueItems");
-        _questions = questions;
-        _credits = credits;
-        _clock = clock;
-    }
-
-    public async Task PrepareAsync(string userId)
-    {
-        if (await _credits.IsMasteryBaselineAppliedAsync(userId)) return;
-        var states = await CurrentStatesAsync(userId);
-        await _credits.InitializeMasteryBaselineAsync(userId, states.SelectMany(BaselineOperations));
-    }
-
-    public async Task<List<CreditAward>> AwardPromotionsAsync(string userId)
-    {
-        var awards = new List<CreditAward>();
-        var applied = await _credits.GetAppliedOperationsAsync(userId);
-        foreach (var system in await CurrentStatesAsync(userId))
-        {
-            foreach (var state in EarnedStates(system.MasteryState))
-            {
-                var spec = AwardSpec(state);
-                if (applied.Contains(Operation(system.System, state))) continue;
-                var result = await _credits.AwardAsync(userId, new CreditAwardRequest(
-                    Operation(system.System, state), spec.Amount, spec.Reason, spec.Description,
-                    "step3_system", system.System, false));
-                if (result.Award is not null) awards.Add(result.Award);
-                applied.Add(Operation(system.System, state));
-            }
-        }
-        return awards;
-    }
-
-    private async Task<List<DashboardSystemPerformance>> CurrentStatesAsync(string userId)
-    {
-        var attempts = await _attempts.Find(value => value.UserId == userId).ToListAsync();
-        var reviews = await _reviews.Find(value => value.UserId == userId).ToListAsync();
-        var queue = await _queue.Find(value => value.UserId == userId).ToListAsync();
-        var ids = attempts.Select(value => value.QuestionExternalId)
-            .Concat(reviews.Select(value => value.QuestionExternalId))
-            .Concat(queue.Select(value => value.QuestionExternalId));
-        var questions = await _questions.GetByExternalIdsAsync(ids);
-        return MasteryCalculator.Calculate(attempts, reviews, queue, questions, _clock.GetUtcNow().UtcDateTime);
-    }
-
-    private static IEnumerable<string> BaselineOperations(DashboardSystemPerformance system) =>
-        EarnedStates(system.MasteryState).Select(state => Operation(system.System, state));
-
-    private static IEnumerable<string> EarnedStates(string state)
-    {
-        if (state is MasteryStates.Practicing or MasteryStates.Strong or MasteryStates.Mastered)
-            yield return MasteryStates.Practicing;
-        if (state is MasteryStates.Strong or MasteryStates.Mastered)
-            yield return MasteryStates.Strong;
-        if (state is MasteryStates.Mastered)
-            yield return MasteryStates.Mastered;
-    }
-
-    private static string Operation(string system, string state) =>
-        $"mastery:{system.ToLowerInvariant().Replace(' ', '_')}:{state}";
-
-    private static (int Amount, string Reason, string Description) AwardSpec(string state) => state switch
-    {
-        MasteryStates.Practicing => (3, CreditReasonCodes.MasteryPracticing, "System advanced to Practicing"),
-        MasteryStates.Strong => (5, CreditReasonCodes.MasteryStrong, "System advanced to Strong"),
-        _ => (10, CreditReasonCodes.MasteryMastered, "System advanced to Mastered")
-    };
-}

api/QuestionsApi/Services/MasteryCalculator.cs

@@ -1,109 +0,0 @@
-using QuestionsApi.Models;
-
-namespace QuestionsApi.Services;
-
-public static class MasteryCalculator
-{
-    private static readonly IReadOnlyDictionary<int, double> DifficultyWeights = new Dictionary<int, double>
-    {
-        [1] = 0.6, [2] = 0.8, [3] = 1.0, [4] = 1.2, [5] = 1.4
-    };
-
-    public static List<DashboardSystemPerformance> Calculate(
-        IEnumerable<QuestionAttempt> attempts,
-        IEnumerable<QuestionReviewAttempt> reviews,
-        IEnumerable<ReviewQueueItem> queueItems,
-        IReadOnlyDictionary<string, Question> questions,
-        DateTime nowUtc)
-    {
-        var mappedAttempts = attempts.Where(attempt => questions.ContainsKey(attempt.QuestionExternalId)).ToList();
-        var answered = mappedAttempts.Where(attempt => !attempt.IsSkip).ToList();
-        var maxCycle = mappedAttempts.Count == 0 ? 0 : mappedAttempts.Max(attempt => attempt.BankCycle);
-        var reviewList = reviews.OrderBy(review => review.CreatedUtc).ToList();
-        var queueList = queueItems.ToList();
-        var results = new List<DashboardSystemPerformance>();
-        foreach (var system in Step3SystemCatalog.All)
-        {
-            var systemAttempts = answered.Where(attempt =>
-                Step3SystemCatalog.Normalize(questions[attempt.QuestionExternalId]) == system).ToList();
-            var ids = systemAttempts.Select(attempt => attempt.QuestionExternalId).Distinct(StringComparer.Ordinal).ToHashSet(StringComparer.Ordinal);
-            var systemReviews = reviewList.Where(review => ids.Contains(review.QuestionExternalId)).ToList();
-            var pending = queueList.Count(item => item.State == ReviewQueueStates.Pending
-                && questions.TryGetValue(item.QuestionExternalId, out var question)
-                && Step3SystemCatalog.Normalize(question) == system);
-            double earned = 0;
-            double possible = 0;
-            var advancedSuccesses = new HashSet<string>(StringComparer.Ordinal);
-            foreach (var attempt in systemAttempts)
-            {
-                var question = questions[attempt.QuestionExternalId];
-                var weight = DifficultyWeights.GetValueOrDefault(Math.Clamp(question.Difficulty, 1, 5), 1.0)
-                    * Math.Pow(0.5, Math.Max(0, maxCycle - attempt.BankCycle));
-                var outcome = attempt.IsCorrect ? 1.0 : RecoveryOutcome(attempt, systemAttempts, systemReviews);
-                earned += weight * outcome;
-                possible += weight;
-                if (question.Difficulty >= 4 && outcome >= 0.75) advancedSuccesses.Add(question.ExternalId);
-            }
-            var score = possible == 0 ? 0 : (int)Math.Round(earned / possible * 100, MidpointRounding.AwayFromZero);
-            var state = State(ids.Count, score, advancedSuccesses.Count, pending);
-            var lastEvidence = systemAttempts.Select(value => (DateTime?)value.CreatedUtc)
-                .Concat(systemReviews.Select(value => (DateTime?)value.CreatedUtc)).Max();
-            var refreshDue = state is MasteryStates.Strong or MasteryStates.Mastered
-                && lastEvidence.HasValue && lastEvidence.Value < nowUtc.AddDays(-30);
-            results.Add(new DashboardSystemPerformance
-            {
-                System = system,
-                Correct = systemAttempts.Count(value => value.IsCorrect),
-                Total = systemAttempts.Count,
-                Accuracy = DashboardStore.Percentage(systemAttempts.Count(value => value.IsCorrect), systemAttempts.Count),
-                MasteryScore = score,
-                MasteryState = state,
-                DistinctQuestions = ids.Count,
-                Difficulty4PlusSuccessful = advancedSuccesses.Count,
-                PendingReviews = pending,
-                LastEvidenceUtc = lastEvidence,
-                RefreshDue = refreshDue,
-                RecommendedAction = Action(state, pending, refreshDue)
-            });
-        }
-        return results;
-    }
-
-    private static double RecoveryOutcome(
-        QuestionAttempt attempt,
-        IReadOnlyCollection<QuestionAttempt> attempts,
-        IReadOnlyCollection<QuestionReviewAttempt> reviews)
-    {
-        var nextAttempt = attempts.Where(value => value.QuestionExternalId == attempt.QuestionExternalId
-                && value.CreatedUtc > attempt.CreatedUtc)
-            .OrderBy(value => value.CreatedUtc).FirstOrDefault();
-        var recovery = reviews.Where(value => value.QuestionExternalId == attempt.QuestionExternalId
-                && value.IsCorrect && value.CreatedUtc > attempt.CreatedUtc
-                && (nextAttempt is null || value.CreatedUtc < nextAttempt.CreatedUtc))
-            .OrderBy(value => value.CreatedUtc).FirstOrDefault();
-        if (recovery is null) return 0;
-        return recovery.CreatedUtc - attempt.CreatedUtc >= TimeSpan.FromHours(24) ? 0.75 : 0.5;
-    }
-
-    private static string State(int distinct, int score, int advanced, int pending)
-    {
-        if (distinct == 0) return MasteryStates.Unseen;
-        if (distinct < 5) return MasteryStates.Learning;
-        if (distinct >= 25 && score >= 85 && advanced >= 5 && pending == 0) return MasteryStates.Mastered;
-        if (distinct >= 15 && score >= 75) return MasteryStates.Strong;
-        return MasteryStates.Practicing;
-    }
-
-    private static DashboardMasteryAction Action(string state, int pending, bool refreshDue)
-    {
-        if (pending > 0) return new() { Type = "review", Label = "Review missed concepts", QuestionCount = pending };
-        return state switch
-        {
-            MasteryStates.Unseen or MasteryStates.Learning => new() { Type = "practice", Label = "Start learning", QuestionCount = 10 },
-            MasteryStates.Practicing => new() { Type = "practice", Label = "Build mastery", QuestionCount = 10, DifficultyMin = 3, DifficultyMax = 4 },
-            MasteryStates.Strong => new() { Type = "practice", Label = "Challenge this system", QuestionCount = 10, DifficultyMin = 4, DifficultyMax = 5 },
-            MasteryStates.Mastered when refreshDue => new() { Type = "practice", Label = "Refresh mastery", QuestionCount = 5, DifficultyMin = 4, DifficultyMax = 5 },
-            _ => new() { Type = "practice", Label = "Maintain mastery", QuestionCount = 5, DifficultyMin = 4, DifficultyMax = 5 }
-        };
-    }
-}

api/QuestionsApi/Services/ProgressionPolicy.cs

@@ -1,42 +0,0 @@
-using QuestionsApi.Models;
-
-namespace QuestionsApi.Services;
-
-public static class ProgressionPolicy
-{
-    public sealed record Threshold(int L, int P, int S, int M, int H, int R);
-    public static readonly Threshold[] Thresholds =
-    [
-        new(0,0,0,0,0,0), new(2,0,0,0,1,0), new(4,1,0,0,3,1),
-        new(6,2,0,0,6,1), new(8,4,0,0,10,2), new(10,6,0,0,15,3),
-        new(0,8,1,0,20,4), new(0,9,2,0,28,5), new(0,10,4,0,36,7),
-        new(0,11,5,1,45,9), new(0,12,7,2,55,11), new(0,13,9,4,65,13),
-        new(0,14,10,6,75,15), new(0,14,12,9,90,18), new(0,14,14,12,105,21)
-    ];
-    public static readonly string[] Names = ["Case Scout", "Pattern Hunter", "Diagnostic Tactician", "Management Strategist", "Clinical Vanguard"];
-    public static readonly string[] Divisions = ["III", "II", "I"];
-
-    public static int Qualified(IReadOnlyCollection<DashboardSystemPerformance> systems, int retention)
-    {
-        var l = systems.Count(x => State(x.MasteryState) >= 1);
-        var p = systems.Count(x => State(x.MasteryState) >= 2);
-        var s = systems.Count(x => State(x.MasteryState) >= 3);
-        var m = systems.Count(x => State(x.MasteryState) >= 4);
-        var h = systems.Sum(x => x.Difficulty4PlusSuccessful);
-        for (var i = Thresholds.Length - 1; i >= 0; i--)
-        {
-            var t = Thresholds[i];
-            if (l >= t.L && p >= t.P && s >= t.S && m >= t.M && h >= t.H && retention >= t.R) return i;
-        }
-        return 0;
-    }
-
-    public static int State(string state) => state switch
-    {
-        MasteryStates.Learning => 1, MasteryStates.Practicing => 2,
-        MasteryStates.Strong => 3, MasteryStates.Mastered => 4, _ => 0
-    };
-    public static string Name(int ordinal) => Names[Math.Clamp(ordinal / 3, 0, 4)];
-    public static string Division(int ordinal) => Divisions[Math.Clamp(ordinal % 3, 0, 2)];
-    public static int TierStart(int ordinal) => ordinal / 3 * 3;
-}

api/QuestionsApi/Services/ProgressionStore.cs

@@ -1,253 +0,0 @@
-using MongoDB.Driver;
-using QuestionsApi.Models;
-
-namespace QuestionsApi.Services;
-
-public sealed class ProgressionStore
-{
-    private readonly IMongoCollection<UserProgression> _progressions;
-    private readonly IMongoCollection<ProgressionWeeklySnapshot> _snapshots;
-    private readonly IMongoCollection<QuestionAttempt> _attempts;
-    private readonly IMongoCollection<QuestionReviewAttempt> _reviews;
-    private readonly IMongoCollection<ReviewQueueItem> _queue;
-    private readonly IMongoCollection<StudySession> _sessions;
-    private readonly QuestionStore _questions;
-    private readonly CreditStore _credits;
-    private readonly TimeProvider _clock;
-
-    public ProgressionStore(MongoDatabaseProvider mongo, QuestionStore questions, CreditStore credits, TimeProvider clock)
-    {
-        var db = mongo.Database;
-        _progressions = db.GetCollection<UserProgression>("UserProgressions");
-        _snapshots = db.GetCollection<ProgressionWeeklySnapshot>("ProgressionWeeklySnapshots");
-        _attempts = db.GetCollection<QuestionAttempt>("QuestionAttempts");
-        _reviews = db.GetCollection<QuestionReviewAttempt>("QuestionReviewAttempts");
-        _queue = db.GetCollection<ReviewQueueItem>("ReviewQueueItems");
-        _sessions = db.GetCollection<StudySession>("StudySessions");
-        _questions = questions;
-        _credits = credits;
-        _clock = clock;
-        _progressions.Indexes.CreateOne(new CreateIndexModel<UserProgression>(
-            Builders<UserProgression>.IndexKeys.Ascending(x => x.UserId), new CreateIndexOptions { Unique = true }));
-        _snapshots.Indexes.CreateOne(new CreateIndexModel<ProgressionWeeklySnapshot>(
-            Builders<ProgressionWeeklySnapshot>.IndexKeys.Ascending(x => x.UserId).Descending(x => x.WeekStartUtc)));
-    }
-
-    public async Task PrepareAsync(string userId)
-    {
-        if (await _progressions.Find(x => x.UserId == userId).AnyAsync())
-        {
-            await EnsureWeeklyOpeningAsync(userId);
-            return;
-        }
-        var evidence = await EvidenceAsync(userId);
-        var qualified = ProgressionPolicy.Qualified(evidence.Systems, evidence.Retention);
-        var now = _clock.GetUtcNow().UtcDateTime;
-        var progression = new UserProgression
-        {
-            UserId = userId, HighestRankOrdinal = qualified, BaselineApplied = true,
-            TrackingStartedUtc = now, UpdatedUtc = now,
-            EarnedRanksUtc = Enumerable.Range(0, qualified + 1).ToDictionary(x => x.ToString(), _ => now)
-        };
-        ApplyHistoricalRecords(progression, evidence);
-        try { await _progressions.InsertOneAsync(progression); }
-        catch (MongoWriteException exception) when (exception.WriteError?.Category == ServerErrorCategory.DuplicateKey) { }
-        await EnsureWeeklyOpeningAsync(userId, evidence);
-    }
-
-    public async Task<(ProgressionResponse State, List<CreditAward> Awards)> RefreshAsync(string userId)
-    {
-        await PrepareAsync(userId);
-        var evidence = await EvidenceAsync(userId);
-        var progression = await _progressions.Find(x => x.UserId == userId).FirstAsync();
-        var oldHighest = progression.HighestRankOrdinal;
-        var qualified = ProgressionPolicy.Qualified(evidence.Systems, evidence.Retention);
-        var now = _clock.GetUtcNow().UtcDateTime;
-        ApplyHistoricalRecords(progression, evidence);
-        if (qualified > progression.HighestRankOrdinal)
-        {
-            progression.HighestRankOrdinal = qualified;
-            for (var i = oldHighest + 1; i <= qualified; i++) progression.EarnedRanksUtc.TryAdd(i.ToString(), now);
-        }
-        await UpdateWeeklyAsync(progression, evidence, now);
-        progression.UpdatedUtc = now;
-        var update = Builders<UserProgression>.Update.Max(x => x.HighestRankOrdinal, qualified)
-            .Set(x => x.CurrentHardStreak, progression.CurrentHardStreak)
-            .Set(x => x.BestHardStreak, progression.BestHardStreak)
-            .Set(x => x.BestHardStreakUtc, progression.BestHardStreakUtc)
-            .Set(x => x.BestTimedBlock, progression.BestTimedBlock)
-            .Set(x => x.SystemsAdvancedWeek, progression.SystemsAdvancedWeek)
-            .Set(x => x.ReviewQueueReduction, progression.ReviewQueueReduction)
-            .Set(x => x.WeakSystemImprovement, progression.WeakSystemImprovement)
-            .Set(x => x.UpdatedUtc, now);
-        for (var i = oldHighest + 1; i <= qualified; i++) update = update.Set($"EarnedRanksUtc.{i}", now);
-        await _progressions.UpdateOneAsync(x => x.UserId == userId, update);
-        progression = await _progressions.Find(x => x.UserId == userId).FirstAsync();
-
-        var awards = new List<CreditAward>();
-        foreach (var tier in new[] { 3, 6, 9, 12 }.Where(x => oldHighest < x && qualified >= x))
-        {
-            var amount = tier switch { 3 => 5, 6 => 10, 9 => 15, _ => 25 };
-            var result = await _credits.AwardAsync(userId, new CreditAwardRequest(
-                $"progression:rank:{tier}", amount, CreditReasonCodes.RankPromotion,
-                $"Advanced to {ProgressionPolicy.Name(tier)}", "progression_rank", tier.ToString(), false));
-            if (result.Award is not null) awards.Add(result.Award);
-        }
-        return (Response(progression, qualified, evidence), awards);
-    }
-
-    public async Task<ProgressionResponse> GetAsync(string userId) => (await RefreshAsync(userId)).State;
-
-    private async Task EnsureWeeklyOpeningAsync(string userId, Evidence? supplied = null)
-    {
-        var now = _clock.GetUtcNow().UtcDateTime;
-        var week = WeekStart(now);
-        var id = $"{userId}:{week:yyyyMMdd}";
-        if (await _snapshots.Find(x => x.Id == id).AnyAsync()) return;
-        var evidence = supplied ?? await EvidenceAsync(userId);
-        var values = Snapshots(evidence.Systems);
-        var snapshot = new ProgressionWeeklySnapshot
-        {
-            Id = id, UserId = userId, WeekStartUtc = week,
-            OpeningSystems = values, LatestSystems = values,
-            OpeningPendingReviews = evidence.Pending, LatestPendingReviews = evidence.Pending, UpdatedUtc = now
-        };
-        try { await _snapshots.InsertOneAsync(snapshot); }
-        catch (MongoWriteException exception) when (exception.WriteError?.Category == ServerErrorCategory.DuplicateKey) { }
-    }
-
-    private async Task UpdateWeeklyAsync(UserProgression progression, Evidence evidence, DateTime now)
-    {
-        await EnsureWeeklyOpeningAsync(progression.UserId, evidence);
-        var week = WeekStart(now);
-        var id = $"{progression.UserId}:{week:yyyyMMdd}";
-        await _snapshots.UpdateOneAsync(x => x.Id == id, Builders<ProgressionWeeklySnapshot>.Update
-            .Set(x => x.LatestSystems, Snapshots(evidence.Systems)).Set(x => x.LatestPendingReviews, evidence.Pending)
-            .Set(x => x.UpdatedUtc, now));
-        var all = await _snapshots.Find(x => x.UserId == progression.UserId).ToListAsync();
-        foreach (var snapshot in all)
-        {
-            var opening = snapshot.OpeningSystems.ToDictionary(x => x.System);
-            var advanced = snapshot.LatestSystems.Count(x => opening.TryGetValue(x.System, out var before) && x.StateOrdinal > before.StateOrdinal);
-            SetRecordIfBetter(progression.SystemsAdvancedWeek, advanced, 0, $"Week of {snapshot.WeekStartUtc:yyyy-MM-dd}", snapshot.UpdatedUtc);
-            var reduced = Math.Max(0, snapshot.OpeningPendingReviews - snapshot.LatestPendingReviews);
-            SetRecordIfBetter(progression.ReviewQueueReduction, reduced, snapshot.OpeningPendingReviews,
-                $"Week of {snapshot.WeekStartUtc:yyyy-MM-dd}", snapshot.UpdatedUtc);
-            foreach (var after in snapshot.LatestSystems)
-            {
-                if (!opening.TryGetValue(after.System, out var before) || before.MasteryScore >= 75 || before.DistinctQuestions < 5) continue;
-                SetRecordIfBetter(progression.WeakSystemImprovement, Math.Max(0, after.MasteryScore - before.MasteryScore),
-                    after.DistinctQuestions, after.System, snapshot.UpdatedUtc);
-            }
-        }
-    }
-
-    private async Task<Evidence> EvidenceAsync(string userId)
-    {
-        var attempts = await _attempts.Find(x => x.UserId == userId).SortBy(x => x.CreatedUtc).ToListAsync();
-        var reviews = await _reviews.Find(x => x.UserId == userId).SortBy(x => x.CreatedUtc).ToListAsync();
-        var queue = await _queue.Find(x => x.UserId == userId).ToListAsync();
-        var ids = attempts.Select(x => x.QuestionExternalId).Concat(reviews.Select(x => x.QuestionExternalId)).Concat(queue.Select(x => x.QuestionExternalId));
-        var questions = await _questions.GetByExternalIdsAsync(ids);
-        var systems = MasteryCalculator.Calculate(attempts, reviews, queue, questions, _clock.GetUtcNow().UtcDateTime);
-        var delayed = reviews.Where(x => x.IsCorrect).Select(x => new
-        {
-            Review = x, Item = queue.FirstOrDefault(q => q.QuestionExternalId == x.QuestionExternalId)
-        }).Where(x => x.Item is not null && x.Review.CreatedUtc - x.Item.CreatedUtc >= TimeSpan.FromHours(24))
-          .Select(x => x.Review.QuestionExternalId).Distinct().Count();
-        var directHard = attempts.Where(x => x.IsCorrect && !x.IsSkip && questions.TryGetValue(x.QuestionExternalId, out var q) && q.Difficulty >= 4)
-            .Select(x => x.QuestionExternalId).Distinct().Count();
-        var sessions = await _sessions.Find(x => x.UserId == userId && x.State == StudySessionStates.Completed
-            && x.Mode == "Timed" && x.GoalType != StudyGoalTypes.SimulationBlock).ToListAsync();
-        return new Evidence(attempts, reviews, queue, sessions, questions, systems, delayed + directHard / 5,
-            queue.Count(x => x.State == ReviewQueueStates.Pending));
-    }
-
-    private void ApplyHistoricalRecords(UserProgression progression, Evidence evidence)
-    {
-        var streak = 0;
-        foreach (var attempt in evidence.Attempts.Where(x => evidence.Questions.TryGetValue(x.QuestionExternalId, out var q) && q.Difficulty >= 4))
-        {
-            streak = attempt.IsCorrect && !attempt.IsSkip ? streak + 1 : 0;
-            if (streak > progression.BestHardStreak)
-            {
-                progression.BestHardStreak = streak;
-                progression.BestHardStreakUtc = attempt.CreatedUtc;
-            }
-        }
-        progression.CurrentHardStreak = streak;
-
-        var attemptsById = evidence.Attempts.Where(x => x.Id is not null).ToDictionary(x => x.Id!);
-        foreach (var session in evidence.Sessions)
-        {
-            var sessionAttempts = session.AppliedEventIds.Where(attemptsById.ContainsKey).Select(x => attemptsById[x]).ToList();
-            if (sessionAttempts.Count < 20 || sessionAttempts.Count != session.AppliedEventIds.Count) continue;
-            var hard = sessionAttempts.Count(x => evidence.Questions.TryGetValue(x.QuestionExternalId, out var q) && q.Difficulty >= 4);
-            if (hard * 2 < sessionAttempts.Count) continue;
-            var accuracy = (int)Math.Round(sessionAttempts.Count(x => x.IsCorrect && !x.IsSkip) * 100d / sessionAttempts.Count);
-            if (accuracy > progression.BestTimedBlock.Value
-                || accuracy == progression.BestTimedBlock.Value && sessionAttempts.Count > progression.BestTimedBlock.SampleSize)
-                progression.BestTimedBlock = new PersonalRecordValue { Value = accuracy, SampleSize = sessionAttempts.Count,
-                    Detail = $"{hard} difficulty 4–5 questions", AchievedUtc = session.CompletedUtc ?? session.UpdatedUtc };
-        }
-    }
-
-    private static void SetRecordIfBetter(PersonalRecordValue record, int value, int sample, string detail, DateTime date)
-    {
-        if (value <= record.Value) return;
-        record.Value = value; record.SampleSize = sample; record.Detail = detail; record.AchievedUtc = date;
-    }
-
-    private static ProgressionResponse Response(UserProgression p, int qualified, Evidence evidence)
-    {
-        var earnedTierNames = Enumerable.Range(0, p.HighestRankOrdinal / 3 + 1).Select(x => ProgressionPolicy.Names[x]).ToList();
-        var response = new ProgressionResponse
-        {
-            RankOrdinal = p.HighestRankOrdinal, QualifiedRankOrdinal = qualified,
-            RankName = ProgressionPolicy.Name(p.HighestRankOrdinal), Division = ProgressionPolicy.Division(p.HighestRankOrdinal),
-            TrackingStartedUtc = p.TrackingStartedUtc, EarnedBadges = earnedTierNames, EarnedRanksUtc = p.EarnedRanksUtc,
-            Records = Records(p), Ladder = Enumerable.Range(0, ProgressionPolicy.Thresholds.Length).Select(i =>
-            {
-                var t = ProgressionPolicy.Thresholds[i];
-                var parts = new List<string>();
-                if (t.L > 0) parts.Add($"Learning+ {t.L}"); if (t.P > 0) parts.Add($"Practicing+ {t.P}");
-                if (t.S > 0) parts.Add($"Strong+ {t.S}"); if (t.M > 0) parts.Add($"Mastered {t.M}");
-                if (t.H > 0) parts.Add($"Hard successes {t.H}"); if (t.R > 0) parts.Add($"Retention {t.R}");
-                return new ProgressionRankResponse { Ordinal=i, RankName=ProgressionPolicy.Name(i), Division=ProgressionPolicy.Division(i),
-                    Earned=i <= p.HighestRankOrdinal, EarnedUtc=p.EarnedRanksUtc.GetValueOrDefault(i.ToString()),
-                    RequirementSummary=parts.Count == 0 ? "Starting rank" : string.Join(" · ", parts) };
-            }).ToList()
-        };
-        if (p.HighestRankOrdinal >= ProgressionPolicy.Thresholds.Length - 1) return response;
-        var next = p.HighestRankOrdinal + 1;
-        response.NextRankName = ProgressionPolicy.Name(next); response.NextDivision = ProgressionPolicy.Division(next);
-        var threshold = ProgressionPolicy.Thresholds[next];
-        var values = new Dictionary<string, (string Label, int Current, int Required)>
-        {
-            ["learning"] = ("Systems at Learning+", evidence.Systems.Count(x => ProgressionPolicy.State(x.MasteryState) >= 1), threshold.L),
-            ["practicing"] = ("Systems at Practicing+", evidence.Systems.Count(x => ProgressionPolicy.State(x.MasteryState) >= 2), threshold.P),
-            ["strong"] = ("Systems at Strong+", evidence.Systems.Count(x => ProgressionPolicy.State(x.MasteryState) >= 3), threshold.S),
-            ["mastered"] = ("Systems Mastered", evidence.Systems.Count(x => ProgressionPolicy.State(x.MasteryState) >= 4), threshold.M),
-            ["hard"] = ("Difficulty 4+ successes", evidence.Systems.Sum(x => x.Difficulty4PlusSuccessful), threshold.H),
-            ["retention"] = ("Retention evidence", evidence.Retention, threshold.R)
-        };
-        response.NextRequirements = values.Where(x => x.Value.Required > 0).Select(x => new ProgressionRequirementResponse
-            { Key = x.Key, Label = x.Value.Label, Current = x.Value.Current, Required = x.Value.Required }).ToList();
-        return response;
-    }
-
-    private static List<ProgressionRecordResponse> Records(UserProgression p) =>
-    [
-        new() { Key="timed_block", Label="Advanced Timed Block", Definition="Best accuracy in a completed 20+ question Timed block with at least 50% difficulty 4–5.", Value=p.BestTimedBlock.Value, SampleSize=p.BestTimedBlock.SampleSize, Detail=p.BestTimedBlock.Detail, AchievedUtc=p.BestTimedBlock.AchievedUtc },
-        new() { Key="hard_streak", Label="Hard-Question Streak", Definition="Consecutive correct first attempts at difficulty 4–5; easier questions are ignored.", Value=p.BestHardStreak, AchievedUtc=p.BestHardStreakUtc },
-        new() { Key="systems_week", Label="Systems Advanced in a Week", Definition="Unique systems whose mastery state increased in one UTC Monday–Sunday week.", Value=p.SystemsAdvancedWeek.Value, Detail=p.SystemsAdvancedWeek.Detail, AchievedUtc=p.SystemsAdvancedWeek.AchievedUtc, TrackingFromLaunch=true },
-        new() { Key="reviews_week", Label="Review Queue Reduction", Definition="Largest weekly decrease in pending reviews.", Value=p.ReviewQueueReduction.Value, SampleSize=p.ReviewQueueReduction.SampleSize, Detail=p.ReviewQueueReduction.Detail, AchievedUtc=p.ReviewQueueReduction.AchievedUtc, TrackingFromLaunch=true },
-        new() { Key="weak_gain", Label="Weak-System Improvement", Definition="Largest weekly mastery-score gain in a system that began below 75 with at least five questions of evidence.", Value=p.WeakSystemImprovement.Value, SampleSize=p.WeakSystemImprovement.SampleSize, Detail=p.WeakSystemImprovement.Detail, AchievedUtc=p.WeakSystemImprovement.AchievedUtc, TrackingFromLaunch=true }
-    ];
-
-    private static List<ProgressionSystemSnapshot> Snapshots(IEnumerable<DashboardSystemPerformance> systems) => systems.Select(x => new ProgressionSystemSnapshot
-        { System=x.System, StateOrdinal=ProgressionPolicy.State(x.MasteryState), MasteryScore=x.MasteryScore, DistinctQuestions=x.DistinctQuestions }).ToList();
-    private static DateTime WeekStart(DateTime value) => value.Date.AddDays(-((7 + (int)value.DayOfWeek - (int)DayOfWeek.Monday) % 7));
-    private sealed record Evidence(List<QuestionAttempt> Attempts, List<QuestionReviewAttempt> Reviews, List<ReviewQueueItem> Queue, List<StudySession> Sessions,
-        IReadOnlyDictionary<string, Question> Questions, List<DashboardSystemPerformance> Systems, int Retention, int Pending);
-}

api/QuestionsApi/Services/QuestionAttemptCycleMigrationCommand.cs

@@ -1,66 +0,0 @@
-using MongoDB.Bson;
-using MongoDB.Driver;
-using QuestionsApi.Models;
-
-namespace QuestionsApi.Services;
-
-public static class QuestionAttemptCycleMigrationCommand
-{
-    public const string Confirmation = "MIGRATE_ATTEMPT_CYCLES";
-    public const string LegacyIndexName = "QuestionExternalId_1_UserId_1";
-    public const string CycleIndexName = "uq_question_user_cycle";
-
-    public static async Task<int> RunAsync(
-        IConfiguration configuration, string[] args, TextWriter output)
-    {
-        var apply = args.Contains("--apply", StringComparer.Ordinal);
-        var confirmation = Option(args, "--confirm");
-        var mongo = new MongoDatabaseProvider(configuration);
-        var attempts = mongo.Database.GetCollection<QuestionAttempt>("QuestionAttempts");
-        var missingFilter = new BsonDocumentFilterDefinition<QuestionAttempt>(
-            new BsonDocument(nameof(QuestionAttempt.BankCycle),
-                new BsonDocument("$exists", false)));
-        var missing = await attempts.CountDocumentsAsync(missingFilter);
-        var indexes = (await attempts.Indexes.ListAsync()).ToList();
-        var names = indexes.Select(value => value["name"].AsString).ToHashSet(StringComparer.Ordinal);
-
-        await output.WriteLineAsync(
-            $"QuestionAttempts missing BankCycle: {missing}; legacy index: {names.Contains(LegacyIndexName)}; cycle index: {names.Contains(CycleIndexName)}.");
-        if (!apply)
-        {
-            await output.WriteLineAsync(
-                $"Dry run only. Re-run with --apply --confirm {Confirmation}.");
-            return 0;
-        }
-        if (confirmation != Confirmation)
-        {
-            await output.WriteLineAsync($"Refusing migration: --confirm {Confirmation} is required.");
-            return 2;
-        }
-
-        if (missing > 0)
-            await attempts.UpdateManyAsync(
-                missingFilter,
-                Builders<QuestionAttempt>.Update.Set(value => value.BankCycle, 0));
-        if (!names.Contains(CycleIndexName))
-            await attempts.Indexes.CreateOneAsync(new CreateIndexModel<QuestionAttempt>(
-                Builders<QuestionAttempt>.IndexKeys
-                    .Ascending(value => value.QuestionExternalId)
-                    .Ascending(value => value.UserId)
-                    .Ascending(value => value.BankCycle),
-                new CreateIndexOptions { Unique = true, Name = CycleIndexName }));
-        if (names.Contains(LegacyIndexName))
-            await attempts.Indexes.DropOneAsync(LegacyIndexName);
-
-        var remaining = await attempts.CountDocumentsAsync(missingFilter);
-        await output.WriteLineAsync(
-            $"Migration complete. Backfilled {missing}; missing BankCycle: {remaining}; dropped legacy index: {names.Contains(LegacyIndexName)}.");
-        return remaining == 0 ? 0 : 1;
-    }
-
-    private static string Option(string[] args, string name)
-    {
-        var index = Array.IndexOf(args, name);
-        return index >= 0 && index + 1 < args.Length ? args[index + 1] : "";
-    }
-}

api/QuestionsApi/Services/QuestionAttemptStore.cs

@@ -17,11 +17,10 @@ public class QuestionAttemptStore
 
         var firstAttemptIndex = Builders<QuestionAttempt>.IndexKeys
             .Ascending(a => a.QuestionExternalId)
-            .Ascending(a => a.UserId)
-            .Ascending(a => a.BankCycle);
+            .Ascending(a => a.UserId);
         _col.Indexes.CreateOne(new CreateIndexModel<QuestionAttempt>(
             firstAttemptIndex,
-            new CreateIndexOptions { Unique = true, Name = "uq_question_user_cycle" }));
+            new CreateIndexOptions { Unique = true }));
 
         var questionIndex = Builders<QuestionAttempt>.IndexKeys.Ascending(a => a.QuestionExternalId);
         _col.Indexes.CreateOne(new CreateIndexModel<QuestionAttempt>(questionIndex));
@@ -39,14 +38,12 @@ public class QuestionAttemptStore
         bool isCorrect,
         bool isSkip = false,
         IReadOnlyCollection<string>? presentedChoiceIds = null,
-        int durationSeconds = 0,
-        int bankCycle = 0)
+        int durationSeconds = 0)
     {
         var attempt = new QuestionAttempt
         {
             QuestionExternalId = questionExternalId,
             UserId = userId,
-            BankCycle = bankCycle,
             ChoiceId = choiceId,
             PresentedChoiceIds = presentedChoiceIds?.ToList() ?? [],
             TracksPresentation = presentedChoiceIds is { Count: > 0 },
@@ -66,8 +63,7 @@ public class QuestionAttemptStore
         catch (MongoWriteException ex) when (ex.WriteError.Category == ServerErrorCategory.DuplicateKey)
         {
             var existing = await _col
-                .Find(a => a.QuestionExternalId == questionExternalId &&
-                    a.UserId == userId && a.BankCycle == bankCycle)
+                .Find(a => a.QuestionExternalId == questionExternalId && a.UserId == userId)
                 .FirstAsync();
             return new QuestionAttemptRecordResult { Inserted = false, Attempt = existing };
         }
@@ -79,17 +75,11 @@ public class QuestionAttemptStore
             Builders<QuestionAttempt>.Filter.Gte(attempt => attempt.CreatedUtc, sinceUtc))
             .ToListAsync();
 
-    public Task<List<string>> GetUserQuestionIdsAsync(string userId, int? bankCycle = null)
-    {
-        var filter = Builders<QuestionAttempt>.Filter.Eq(attempt => attempt.UserId, userId);
-        if (bankCycle.HasValue)
-            filter &= Builders<QuestionAttempt>.Filter.Eq(attempt => attempt.BankCycle, bankCycle.Value);
-        return
+    public Task<List<string>> GetUserQuestionIdsAsync(string userId) =>
         _col.Distinct(
             attempt => attempt.QuestionExternalId,
-            filter)
+            Builders<QuestionAttempt>.Filter.Eq(attempt => attempt.UserId, userId))
             .ToListAsync();
-    }
 
     public IMongoCollection<QuestionAttempt> Collection => _col;
 

api/QuestionsApi/Services/QuestionStore.cs

@@ -21,10 +21,6 @@ public class QuestionStore
         _col.Indexes.CreateOne(new CreateIndexModel<Question>(systemIndex));
         var tagsIndex = Builders<Question>.IndexKeys.Ascending(q => q.Tags);
         _col.Indexes.CreateOne(new CreateIndexModel<Question>(tagsIndex));
-        var step3SystemIndex = Builders<Question>.IndexKeys.Ascending(q => q.Step3System)
-            .Ascending(q => q.IsPublished).Ascending(q => q.FlaggedForReviewUtc).Ascending(q => q.Difficulty);
-        _col.Indexes.CreateOne(new CreateIndexModel<Question>(step3SystemIndex,
-            new CreateIndexOptions { Name = "step3_system_visibility_difficulty" }));
     }
 
     public async Task<List<Question>> SearchAsync(QuestionSearchRequest req, bool includeUnpublished)
@@ -59,18 +55,10 @@ public class QuestionStore
 
         var filter = filters.Count == 0 ? builder.Empty : builder.And(filters);
         var limit = Math.Clamp(req.Limit, 1, 80);
-        if (string.IsNullOrWhiteSpace(req.Step3System))
-            return await _col.Aggregate().Match(filter).Sample(limit).ToListAsync();
-
-        var requested = Step3SystemCatalog.Normalize(req.Step3System)
-            ?? throw new ArgumentException("step3System must be an official Step 3 system");
-        // Include legacy records until the idempotent Step3System backfill has run.
-        var systemFilter = builder.Eq(question => question.Step3System, requested)
-            | builder.Exists(nameof(Question.Step3System), false)
-            | builder.Eq(question => question.Step3System, "");
-        var candidates = await _col.Find(filter & systemFilter).ToListAsync();
-        return candidates.Where(question => Step3SystemCatalog.Normalize(question) == requested)
-            .OrderBy(_ => Random.Shared.Next()).Take(limit).ToList();
+        return await _col.Aggregate()
+            .Match(filter)
+            .Sample(limit)
+            .ToListAsync();
     }
 
     public async Task<Question?> GetByIdAsync(string id) =>
@@ -292,11 +280,6 @@ public class QuestionStore
         ChoiceSelectionPercentages = req.ChoiceSelectionPercentages,
         Discipline = req.Discipline.Trim(),
         System = req.System.Trim(),
-        Step3System = Step3SystemCatalog.Derive(new Question
-        {
-            ExternalId = req.ExternalId.Trim(), System = req.System.Trim(),
-            PerformanceCategory = req.PerformanceCategory.Trim(), Discipline = req.Discipline.Trim()
-        }) ?? "",
         PerformanceCategory = RatingCategory.Normalize(req.PerformanceCategory, req.System, req.Discipline),
         Difficulty = req.Difficulty,
         Labs = req.Labs,

api/QuestionsApi/Services/QuestionValidator.cs

@@ -49,21 +49,6 @@ public static class QuestionValidator
             if (!entry.Value.Choices.Any(choice => choice.Id == entry.Value.CorrectChoiceId))
                 return "wrongAnswerFollowups correctChoiceId must match a follow-up choice id";
         }
-        if (req.IsPublished)
-        {
-            if (req.WrongAnswerFollowups.Any(entry => entry.Value.Choices.Count != 3))
-                return "published wrongAnswerFollowups require exactly three choices per distractor";
-            if (!AllDistinct(req.WrongAnswerFollowups.Values.Select(value => value.Prompt)))
-                return "published wrongAnswerFollowups require a different prompt for every distractor";
-            if (!AllDistinct(req.WrongAnswerFollowups.Values.Select(value => value.TeachingPoint)))
-                return "published wrongAnswerFollowups require a different teachingPoint for every distractor";
-            if (!AllDistinct(req.WrongAnswerFollowups.Values.Select(value =>
-                    value.Choices.Single(choice => choice.Id == value.CorrectChoiceId).Text)))
-                return "published wrongAnswerFollowups require a different correct follow-up answer for every distractor";
-            if (!AllDistinct(req.WrongAnswerFollowups.Values.Select(value => string.Join("|",
-                    value.Choices.Select(choice => Normalize(choice.Text)).OrderBy(text => text, StringComparer.Ordinal)))))
-                return "published wrongAnswerFollowups require a different choice set for every distractor";
-        }
 
         if (req.ReviewFollowups is null) return "reviewFollowups must be an array";
         if (req.ReviewFollowups.Count > 10) return "questions support at most ten review follow-ups";
@@ -90,16 +75,6 @@ public static class QuestionValidator
         return null;
     }
 
-    private static bool AllDistinct(IEnumerable<string> values)
-    {
-        var normalized = values.Select(Normalize).ToList();
-        return normalized.All(value => value.Length > 0)
-            && normalized.Distinct(StringComparer.Ordinal).Count() == normalized.Count;
-    }
-
-    private static string Normalize(string value) => string.Join(' ', value.Trim().ToLowerInvariant()
-        .Split((char[]?)null, StringSplitOptions.RemoveEmptyEntries));
-
     public static string? ValidateLabs(IReadOnlyCollection<QuestionLab>? labs, bool requireComplete)
     {
         if (labs is null)

api/QuestionsApi/Services/ReviewQueueStore.cs

@@ -46,20 +46,15 @@ public sealed class ReviewQueueStore
         var update = Builders<ReviewQueueItem>.Update
             .SetOnInsert(value => value.UserId, attempt.UserId)
             .SetOnInsert(value => value.QuestionExternalId, attempt.QuestionExternalId)
+            .SetOnInsert(value => value.SourceAttemptId, attempt.Id ?? "")
+            .SetOnInsert(value => value.State, ReviewQueueStates.Pending)
             .SetOnInsert(value => value.Cycle, 1)
             .SetOnInsert(value => value.CreatedUtc, attempt.CreatedUtc)
-            .Set(value => value.SourceAttemptId, attempt.Id ?? "")
-            .Set(value => value.State, ReviewQueueStates.Pending)
-            .Set(value => value.MasteredUtc, null)
-            .Set(value => value.UpdatedUtc, now);
-        var filter = Builders<ReviewQueueItem>.Filter.Eq(value => value.UserId, attempt.UserId)
-            & Builders<ReviewQueueItem>.Filter.Eq(value => value.QuestionExternalId, attempt.QuestionExternalId)
-            & (Builders<ReviewQueueItem>.Filter.Ne(value => value.State, ReviewQueueStates.Mastered)
-                | Builders<ReviewQueueItem>.Filter.Ne(value => value.SourceAttemptId, attempt.Id ?? ""));
+            .SetOnInsert(value => value.UpdatedUtc, now);
         try
         {
             await _items.UpdateOneAsync(
-                filter,
+                value => value.UserId == attempt.UserId && value.QuestionExternalId == attempt.QuestionExternalId,
                 update,
                 new UpdateOptions { IsUpsert = true });
         }
@@ -71,36 +66,26 @@ public sealed class ReviewQueueStore
 
     public async Task EnsureUserQueueAsync(string userId)
     {
+        var checkpoint = await _backfills.Find(value => value.UserId == userId).FirstOrDefaultAsync();
         var scanThroughUtc = DateTime.UtcNow;
         var filter = Builders<QuestionAttempt>.Filter.Where(value => value.UserId == userId && !value.IsCorrect && !value.IsSkip);
+        if (checkpoint is not null)
+            filter &= Builders<QuestionAttempt>.Filter.Gte(value => value.CreatedUtc, checkpoint.CompletedUtc);
         filter &= Builders<QuestionAttempt>.Filter.Lte(value => value.CreatedUtc, scanThroughUtc);
-        var allMisses = await _firstAttempts.Find(filter).ToListAsync();
-        var existingItems = (await _items.Find(value => value.UserId == userId).ToListAsync())
-            .ToDictionary(value => value.QuestionExternalId, StringComparer.Ordinal);
-        var misses = allMisses.GroupBy(value => value.QuestionExternalId, StringComparer.Ordinal)
-            .Select(group => group.OrderByDescending(value => value.CreatedUtc).First())
-            .Where(attempt => !existingItems.TryGetValue(attempt.QuestionExternalId, out var item)
-                || (item.State == ReviewQueueStates.Mastered
-                    && item.SourceAttemptId != (attempt.Id ?? "")
-                    && (!item.MasteredUtc.HasValue || attempt.CreatedUtc > item.MasteredUtc.Value)))
-            .ToList();
+        var misses = await _firstAttempts.Find(filter).ToListAsync();
         if (misses.Count > 0)
         {
             var now = DateTime.UtcNow;
             var writes = misses.Select(attempt => new UpdateOneModel<ReviewQueueItem>(
-                Builders<ReviewQueueItem>.Filter.Eq(value => value.UserId, userId)
-                    & Builders<ReviewQueueItem>.Filter.Eq(value => value.QuestionExternalId, attempt.QuestionExternalId)
-                    & (Builders<ReviewQueueItem>.Filter.Ne(value => value.State, ReviewQueueStates.Mastered)
-                        | Builders<ReviewQueueItem>.Filter.Ne(value => value.SourceAttemptId, attempt.Id ?? "")),
+                Builders<ReviewQueueItem>.Filter.Where(value => value.UserId == userId && value.QuestionExternalId == attempt.QuestionExternalId),
                 Builders<ReviewQueueItem>.Update
                     .SetOnInsert(value => value.UserId, userId)
                     .SetOnInsert(value => value.QuestionExternalId, attempt.QuestionExternalId)
+                    .SetOnInsert(value => value.SourceAttemptId, attempt.Id ?? "")
+                    .SetOnInsert(value => value.State, ReviewQueueStates.Pending)
                     .SetOnInsert(value => value.Cycle, 1)
                     .SetOnInsert(value => value.CreatedUtc, attempt.CreatedUtc)
-                    .Set(value => value.SourceAttemptId, attempt.Id ?? "")
-                    .Set(value => value.State, ReviewQueueStates.Pending)
-                    .Set(value => value.MasteredUtc, null)
-                    .Set(value => value.UpdatedUtc, now))
+                    .SetOnInsert(value => value.UpdatedUtc, now))
             { IsUpsert = true }).ToList();
             try
             {
@@ -130,50 +115,27 @@ public sealed class ReviewQueueStore
     public Task<long> CountPendingAsync(string userId) =>
         _items.CountDocumentsAsync(value => value.UserId == userId && value.State == ReviewQueueStates.Pending);
 
-    public async Task<long> CountPendingAsync(string userId, string? step3System)
-    {
-        if (string.IsNullOrWhiteSpace(step3System)) return await CountPendingAsync(userId);
-        var requested = Step3SystemCatalog.Normalize(step3System)
-            ?? throw new ArgumentException("step3System must be an official Step 3 system");
-        var pending = await _items.Find(value => value.UserId == userId && value.State == ReviewQueueStates.Pending).ToListAsync();
-        var count = 0L;
-        foreach (var item in pending)
-        {
-            var question = await _questions.GetByExternalIdAsync(item.QuestionExternalId);
-            if (question is not null && Step3SystemCatalog.Normalize(question) == requested) count++;
-        }
-        return count;
-    }
-
-    public Task<List<ReviewQueueItem>> GetUserItemsAsync(string userId) =>
-        _items.Find(value => value.UserId == userId).ToListAsync();
-
-    public Task<List<QuestionReviewAttempt>> GetUserReviewsAsync(string userId) =>
-        _reviews.Find(value => value.UserId == userId).ToListAsync();
-
-    public async Task<ReviewQueueItem?> GetRandomPendingAsync(
-        string userId, IEnumerable<string> excludedIds, string? step3System = null)
+    public async Task<ReviewQueueItem?> GetRandomPendingAsync(string userId, IEnumerable<string> excludedIds)
     {
         var excluded = excludedIds.Where(value => !string.IsNullOrWhiteSpace(value)).Distinct(StringComparer.Ordinal).ToList();
-        var requestedSystem = string.IsNullOrWhiteSpace(step3System) ? null : Step3SystemCatalog.Normalize(step3System);
-        if (!string.IsNullOrWhiteSpace(step3System) && requestedSystem is null)
-            throw new ArgumentException("step3System must be an official Step 3 system");
-        var filter = Builders<ReviewQueueItem>.Filter.Eq(value => value.UserId, userId)
-            & Builders<ReviewQueueItem>.Filter.Eq(value => value.State, ReviewQueueStates.Pending);
-        if (excluded.Count > 0) filter &= Builders<ReviewQueueItem>.Filter.Nin(value => value.QuestionExternalId, excluded);
-        var candidates = await _items.Find(filter).ToListAsync();
-        foreach (var candidate in candidates.OrderBy(_ => Random.Shared.Next()))
+        for (var pass = 0; pass < 5; pass++)
         {
-            var question = await _questions.GetByExternalIdAsync(candidate.QuestionExternalId);
-            if (question is { IsPublished: true, FlaggedForReviewUtc: null })
+            var filter = Builders<ReviewQueueItem>.Filter.Eq(value => value.UserId, userId)
+                & Builders<ReviewQueueItem>.Filter.Eq(value => value.State, ReviewQueueStates.Pending);
+            if (excluded.Count > 0)
+                filter &= Builders<ReviewQueueItem>.Filter.Nin(value => value.QuestionExternalId, excluded);
+            var candidates = await _items.Aggregate().Match(filter).Sample(20).ToListAsync();
+            if (candidates.Count == 0) return null;
+            foreach (var candidate in candidates)
             {
-                if (requestedSystem is null || Step3SystemCatalog.Normalize(question) == requestedSystem) return candidate;
-                continue;
+                var question = await _questions.GetByExternalIdAsync(candidate.QuestionExternalId);
+                if (question is { IsPublished: true, FlaggedForReviewUtc: null }) return candidate;
+                await _items.UpdateOneAsync(
+                    value => value.Id == candidate.Id && value.State == ReviewQueueStates.Pending,
+                    Builders<ReviewQueueItem>.Update
+                        .Set(value => value.State, ReviewQueueStates.Unavailable)
+                        .Set(value => value.UpdatedUtc, DateTime.UtcNow));
             }
-            await _items.UpdateOneAsync(
-                value => value.Id == candidate.Id && value.State == ReviewQueueStates.Pending,
-                Builders<ReviewQueueItem>.Update.Set(value => value.State, ReviewQueueStates.Unavailable)
-                    .Set(value => value.UpdatedUtc, DateTime.UtcNow));
         }
         return null;
     }

api/QuestionsApi/Services/ServiceMetrics.cs

@@ -17,18 +17,6 @@ public sealed class ServiceMetrics
     private readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _dynamicAttempts = new();
     private readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _dynamicCorrect = new();
     private long _dynamicTargetGapTotal;
-    private readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _creditAwards = new();
-    private readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _creditCoins = new();
-    private readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _creditDuplicates = new();
-    private readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _creditCapped = new();
-    private readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _dailyMissionAssigned = new();
-    private readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _dailyMissionCompleted = new();
-    private readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _dailyMissionExpired = new();
-    private long _dailyMissionReplaced;
-    private readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _weeklyGoalAssigned = new();
-    private readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _weeklyGoalCompleted = new();
-    private long _weeklyGoalExpiredIncomplete;
-    private long _weeklyGoalLateFinalized;
 
     public void AttemptCreated() => Interlocked.Increment(ref _attemptsCreated);
     public void AttemptDuplicate() => Interlocked.Increment(ref _attemptDuplicates);
@@ -55,21 +43,6 @@ public sealed class ServiceMetrics
         _dynamicAttempts.AddOrUpdate(tier, 1, (_, value) => value + 1);
         if (correct) _dynamicCorrect.AddOrUpdate(tier, 1, (_, value) => value + 1);
     }
-    public void CreditAward(string reason, int amount)
-    {
-        _creditAwards.AddOrUpdate(reason, 1, (_, value) => value + 1);
-        _creditCoins.AddOrUpdate(reason, amount, (_, value) => value + amount);
-    }
-    public void CreditDuplicate(string reason) => _creditDuplicates.AddOrUpdate(reason, 1, (_, value) => value + 1);
-    public void CreditCapped(string reason) => _creditCapped.AddOrUpdate(reason, 1, (_, value) => value + 1);
-    public void DailyMissionAssigned(string type) => _dailyMissionAssigned.AddOrUpdate(type, 1, (_, value) => value + 1);
-    public void DailyMissionCompleted(string type) => _dailyMissionCompleted.AddOrUpdate(type, 1, (_, value) => value + 1);
-    public void DailyMissionExpired(string type) => _dailyMissionExpired.AddOrUpdate(type, 1, (_, value) => value + 1);
-    public void DailyMissionReplaced() => Interlocked.Increment(ref _dailyMissionReplaced);
-    public void WeeklyGoalAssigned(string type) => _weeklyGoalAssigned.AddOrUpdate(type, 1, (_, value) => value + 1);
-    public void WeeklyGoalCompleted(string type) => _weeklyGoalCompleted.AddOrUpdate(type, 1, (_, value) => value + 1);
-    public void WeeklyGoalExpiredIncomplete() => Interlocked.Increment(ref _weeklyGoalExpiredIncomplete);
-    public void WeeklyGoalLateFinalized() => Interlocked.Increment(ref _weeklyGoalLateFinalized);
 
     public string RenderPrometheus()
     {
@@ -90,36 +63,6 @@ public sealed class ServiceMetrics
             AppendLabeledSample(output, "step3_dynamic_correct_total", tier, _dynamicCorrect.GetValueOrDefault(tier));
         }
         AppendCounter(output, "step3_dynamic_target_gap_points_total", Interlocked.Read(ref _dynamicTargetGapTotal));
-        output.AppendLine("# TYPE step3_credit_awards_total counter");
-        output.AppendLine("# TYPE step3_credit_coins_awarded_total counter");
-        output.AppendLine("# TYPE step3_credit_award_duplicates_total counter");
-        output.AppendLine("# TYPE step3_credit_award_capped_total counter");
-        foreach (var reason in _creditAwards.Keys.Concat(_creditDuplicates.Keys).Concat(_creditCapped.Keys).Distinct().Order())
-        {
-            AppendReasonSample(output, "step3_credit_awards_total", reason, _creditAwards.GetValueOrDefault(reason));
-            AppendReasonSample(output, "step3_credit_coins_awarded_total", reason, _creditCoins.GetValueOrDefault(reason));
-            AppendReasonSample(output, "step3_credit_award_duplicates_total", reason, _creditDuplicates.GetValueOrDefault(reason));
-            AppendReasonSample(output, "step3_credit_award_capped_total", reason, _creditCapped.GetValueOrDefault(reason));
-        }
-        output.AppendLine("# TYPE step3_daily_missions_assigned_total counter");
-        output.AppendLine("# TYPE step3_daily_missions_completed_total counter");
-        output.AppendLine("# TYPE step3_daily_missions_expired_incomplete_total counter");
-        foreach (var type in _dailyMissionAssigned.Keys.Concat(_dailyMissionCompleted.Keys).Concat(_dailyMissionExpired.Keys).Distinct().Order())
-        {
-            AppendMissionSample(output, "step3_daily_missions_assigned_total", type, _dailyMissionAssigned.GetValueOrDefault(type));
-            AppendMissionSample(output, "step3_daily_missions_completed_total", type, _dailyMissionCompleted.GetValueOrDefault(type));
-            AppendMissionSample(output, "step3_daily_missions_expired_incomplete_total", type, _dailyMissionExpired.GetValueOrDefault(type));
-        }
-        AppendCounter(output, "step3_daily_missions_replaced_total", Interlocked.Read(ref _dailyMissionReplaced));
-        output.AppendLine("# TYPE step3_weekly_goals_assigned_total counter");
-        output.AppendLine("# TYPE step3_weekly_goals_completed_total counter");
-        foreach (var type in _weeklyGoalAssigned.Keys.Concat(_weeklyGoalCompleted.Keys).Distinct().Order())
-        {
-            AppendMissionSample(output, "step3_weekly_goals_assigned_total", type, _weeklyGoalAssigned.GetValueOrDefault(type));
-            AppendMissionSample(output, "step3_weekly_goals_completed_total", type, _weeklyGoalCompleted.GetValueOrDefault(type));
-        }
-        AppendCounter(output, "step3_weekly_goals_expired_incomplete_total", Interlocked.Read(ref _weeklyGoalExpiredIncomplete));
-        AppendCounter(output, "step3_weekly_goals_late_finalized_total", Interlocked.Read(ref _weeklyGoalLateFinalized));
         output.AppendLine("# TYPE step3_http_request_duration_seconds summary");
         output.Append("step3_http_request_duration_seconds_count ")
             .Append(Interlocked.Read(ref _httpRequests))
@@ -148,10 +91,4 @@ public sealed class ServiceMetrics
     {
         output.Append(name).Append("{tier=\"").Append(tier.Replace("\"", "")).Append("\"} ").Append(value).AppendLine();
     }
-
-    private static void AppendReasonSample(StringBuilder output, string name, string reason, long value) =>
-        output.Append(name).Append("{reason=\"").Append(reason.Replace("\"", "")).Append("\"} ").Append(value).AppendLine();
-
-    private static void AppendMissionSample(StringBuilder output, string name, string type, long value) =>
-        output.Append(name).Append("{type=\"").Append(type.Replace("\"", "")).Append("\"} ").Append(value).AppendLine();
 }

api/QuestionsApi/Services/Step3SystemBackfillCommand.cs

@@ -1,53 +0,0 @@
-using MongoDB.Bson;
-using MongoDB.Driver;
-using QuestionsApi.Models;
-
-namespace QuestionsApi.Services;
-
-public static class Step3SystemBackfillCommand
-{
-    public const string Confirmation = "BACKFILL_STEP3_SYSTEMS";
-
-    public static async Task<int> RunAsync(IConfiguration configuration, string[] args, TextWriter output)
-    {
-        var apply = args.Contains("--apply", StringComparer.Ordinal);
-        var confirmIndex = Array.IndexOf(args, "--confirm");
-        var confirmation = confirmIndex >= 0 && confirmIndex + 1 < args.Length ? args[confirmIndex + 1] : "";
-        var database = new MongoDatabaseProvider(configuration).Database;
-        var questions = database.GetCollection<Question>("Questions");
-        var all = await questions.Find(FilterDefinition<Question>.Empty).ToListAsync();
-        var classified = all.Select(question => (Question: question, System: Step3SystemCatalog.Derive(question) ?? "")).ToList();
-        var changes = classified.Where(item => item.System.Length > 0 && item.Question.Step3System != item.System).ToList();
-        var unmapped = classified.Count(item => item.System.Length == 0);
-        await output.WriteLineAsync($"Questions requiring Step3System backfill: {changes.Count}; unmapped: {unmapped}.");
-        foreach (var group in classified.Where(item => item.System.Length == 0)
-                     .GroupBy(item => $"{item.Question.System} | {item.Question.PerformanceCategory} | {item.Question.Discipline}")
-                     .OrderByDescending(group => group.Count()).ThenBy(group => group.Key, StringComparer.Ordinal))
-            await output.WriteLineAsync($"Unmapped ({group.Count()}): {group.Key}; ids: {string.Join(", ", group.Select(item => item.Question.ExternalId).Take(10))}");
-        if (!apply)
-        {
-            await output.WriteLineAsync($"Dry run only. Re-run with --apply --confirm {Confirmation}.");
-            return 0;
-        }
-        if (confirmation != Confirmation)
-        {
-            await output.WriteLineAsync($"Refusing migration: --confirm {Confirmation} is required.");
-            return 2;
-        }
-        if (changes.Count > 0)
-        {
-            var writes = changes.Select(item => new UpdateOneModel<Question>(
-                Builders<Question>.Filter.Eq(question => question.Id, item.Question.Id),
-                Builders<Question>.Update.Set(question => question.Step3System, item.System))).ToList();
-            await questions.BulkWriteAsync(writes, new BulkWriteOptions { IsOrdered = false });
-        }
-        var remaining = await questions.CountDocumentsAsync(new BsonDocumentFilterDefinition<Question>(
-            new BsonDocument("$or", new BsonArray
-            {
-                new BsonDocument(nameof(Question.Step3System), new BsonDocument("$exists", false)),
-                new BsonDocument(nameof(Question.Step3System), "")
-            })));
-        await output.WriteLineAsync($"Backfilled {changes.Count}; unmapped or empty Step3System: {remaining}.");
-        return 0;
-    }
-}

api/QuestionsApi/Services/Step3SystemCatalog.cs

@@ -1,74 +0,0 @@
-using QuestionsApi.Models;
-
-namespace QuestionsApi.Services;
-
-public static class Step3SystemCatalog
-{
-    private static readonly IReadOnlyDictionary<string, string> Overrides = new Dictionary<string, string>(StringComparer.Ordinal)
-    {
-        ["d5-expansion-pediatrics-urea-cycle-hyperammonemia-001"] = "Endocrine System",
-        ["d5-expansion-pediatrics-neonatal-hsv-disseminated-001"] = "Immune System, Blood & Lymphoreticular System, and Multisystem Processes/Disorders",
-        ["d5-expansion-pediatrics-cdh-delivery-stabilization-001"] = "Respiratory System",
-        ["d5-expansion-pediatrics-hie-therapeutic-hypothermia-001"] = "Nervous System & Special Senses",
-        ["d5-expansion-pediatrics-fnait-intracranial-bleeding-001"] = "Immune System, Blood & Lymphoreticular System, and Multisystem Processes/Disorders",
-        ["nbme6-s3-i029-infant-hyperchloremic-acidosis-growth-risk"] = "Renal/Urinary & Male Reproductive Systems",
-        ["form7-s1-i042-genitourinary-syndrome-menopause"] = "Pregnancy/Childbirth & Female Reproductive System & Breast",
-        ["free137-i019-inguinal-node-vulvar-source"] = "Pregnancy/Childbirth & Female Reproductive System & Breast",
-        ["free137-i061-klinefelter-confirmation"] = "Renal/Urinary & Male Reproductive Systems",
-        ["form7-s1-i009-cremasteric-reflex"] = "Renal/Urinary & Male Reproductive Systems",
-        ["form7-s2-i015-acrosome-head"] = "Renal/Urinary & Male Reproductive Systems",
-        ["nbme6-s1-i033-prostate-primary-osteoblastic-metastases"] = "Renal/Urinary & Male Reproductive Systems",
-        ["nbme6-s3-i043-lytic-lesion-hematuria-staging"] = "Renal/Urinary & Male Reproductive Systems"
-    };
-    public static readonly string[] All =
-    [
-        "Human Development",
-        "Immune System, Blood & Lymphoreticular System, and Multisystem Processes/Disorders",
-        "Behavioral Health",
-        "Nervous System & Special Senses",
-        "Skin & Subcutaneous Tissue",
-        "Musculoskeletal System",
-        "Cardiovascular System",
-        "Respiratory System",
-        "Gastrointestinal System",
-        "Renal/Urinary & Male Reproductive Systems",
-        "Pregnancy/Childbirth & Female Reproductive System & Breast",
-        "Endocrine System",
-        "Biostatistics & Epidemiology/Population Health & Interpretation of the Medical Literature",
-        "Social Sciences: Communication Skills/Ethics/Patient Safety"
-    ];
-
-    public static string? Normalize(Question question) =>
-        Normalize(question.Step3System)
-        ?? Derive(question);
-
-    public static string? Derive(Question question) =>
-        Overrides.GetValueOrDefault(question.ExternalId)
-        ?? Normalize(question.System) ?? Normalize(question.PerformanceCategory) ?? Normalize(question.Discipline);
-
-    public static string? Normalize(string? value)
-    {
-        if (string.IsNullOrWhiteSpace(value)) return null;
-        var trimmed = value.Trim();
-        var exact = All.FirstOrDefault(system => string.Equals(system, trimmed, StringComparison.OrdinalIgnoreCase));
-        if (exact is not null) return exact;
-        var lower = trimmed.ToLowerInvariant();
-        if (Has(lower, "human development", "well patient", "preventive", "health maintenance", "geriatr", "age-related", "neonat")) return All[0];
-        if (Has(lower, "social science", "communication", "ethic", "patient safety", "professionalism", "systems-based")) return All[13];
-        if (Has(lower, "pregnan", "obstetric", "gynec", "female reproductive", "breast", "puerper")) return All[10];
-        if (Has(lower, "renal", "urinary", "male reproductive", "urolog", "nephro")) return All[9];
-        if (Has(lower, "biostat", "epidemi", "population health", "medical literature")) return All[12];
-        if (Has(lower, "immune", "immun", "blood", "hemat", "lymph", "multisystem", "infectious", "toxicolog", "poisoning", "oncolog", "trauma")) return All[1];
-        if (Has(lower, "behavior", "psychi", "mental health")) return All[2];
-        if (Has(lower, "nervous", "neuro", "special sense", "ophthalm", "eye & adnexa", "otolaryng", "ear, nose", " ent")) return All[3];
-        if (Has(lower, "skin", "derm", "subcutaneous", "integument")) return All[4];
-        if (Has(lower, "musculo", "orthop", "rheumat")) return All[5];
-        if (Has(lower, "cardio", "circulatory", "peripheral vascular")) return All[6];
-        if (Has(lower, "resp", "pulmon")) return All[7];
-        if (Has(lower, "gastro", "digest", "hepato", "oral/dental")) return All[8];
-        if (Has(lower, "endocr", "metabolic")) return All[11];
-        return null;
-    }
-
-    private static bool Has(string value, params string[] fragments) => fragments.Any(value.Contains);
-}

api/QuestionsApi/Services/StudySessionStore.cs

@@ -1,307 +0,0 @@
-using MongoDB.Driver;
-using QuestionsApi.Models;
-
-namespace QuestionsApi.Services;
-
-public sealed class StudySessionStore
-{
-    private readonly IMongoCollection<StudySession> _sessions;
-    private readonly DashboardStore _dashboard;
-    private readonly CreditStore _credits;
-    private readonly ReviewQueueStore _reviews;
-    private readonly TimeProvider _clock;
-
-    public StudySessionStore(
-        MongoDatabaseProvider mongo,
-        DashboardStore dashboard,
-        CreditStore credits,
-        ReviewQueueStore reviews,
-        TimeProvider clock)
-    {
-        _sessions = mongo.Database.GetCollection<StudySession>("StudySessions");
-        _dashboard = dashboard;
-        _credits = credits;
-        _reviews = reviews;
-        _clock = clock;
-        _sessions.Indexes.CreateOne(new CreateIndexModel<StudySession>(
-            Builders<StudySession>.IndexKeys.Ascending(value => value.UserId).Ascending(value => value.ClientSessionId),
-            new CreateIndexOptions { Unique = true, Name = "uq_study_session_client" }));
-        _sessions.Indexes.CreateOne(new CreateIndexModel<StudySession>(
-            Builders<StudySession>.IndexKeys.Ascending(value => value.UserId).Ascending(value => value.State),
-            new CreateIndexOptions { Name = "study_session_user_state" }));
-    }
-
-    public async Task<StudySession> CreateAsync(string userId, CreateStudySessionRequest request)
-    {
-        Validate(request);
-        var existing = await _sessions.Find(value => value.UserId == userId
-            && value.ClientSessionId == request.ClientSessionId).FirstOrDefaultAsync();
-        if (existing is not null) return existing;
-        var now = _clock.GetUtcNow().UtcDateTime;
-        await CloseStaleAsync(userId, now);
-        var activeSimulation = await _sessions.Find(value => value.UserId == userId
-            && value.State == StudySessionStates.Active && value.GoalType == StudyGoalTypes.SimulationBlock)
-            .AnyAsync();
-        if (activeSimulation) throw new InvalidOperationException("Finish the active simulation block before starting another study session.");
-        await _sessions.UpdateManyAsync(
-            value => value.UserId == userId && value.State == StudySessionStates.Active,
-            Builders<StudySession>.Update.Set(value => value.State, StudySessionStates.Interrupted)
-                .Set(value => value.CompletedUtc, now).Set(value => value.UpdatedUtc, now));
-        var dashboard = await _dashboard.GetAsync(userId, now);
-        var normalizedSystem = string.IsNullOrWhiteSpace(request.Step3System)
-            ? "" : Step3SystemCatalog.Normalize(request.Step3System) ?? throw new ArgumentException("Invalid Step 3 system.");
-        var target = request.GoalType switch
-        {
-            StudyGoalTypes.QuestionCount => Math.Clamp(request.TargetValue, 5, 40),
-            StudyGoalTypes.Duration => Math.Clamp(request.TargetValue, 10, 60),
-            StudyGoalTypes.WeakSystem => 10,
-            StudyGoalTypes.DueReviews => Math.Clamp(request.TargetValue, 1, 20),
-            _ => request.TargetValue
-        };
-        if (request.GoalType == StudyGoalTypes.DueReviews)
-        {
-            var pending = checked((int)await _reviews.CountPendingAsync(userId, normalizedSystem));
-            if (pending == 0) throw new ArgumentException("No reviews are currently due.");
-            target = Math.Min(target, pending);
-        }
-        var mastery = dashboard.Systems.FirstOrDefault(value => value.System == normalizedSystem);
-        var session = new StudySession
-        {
-            UserId = userId, ClientSessionId = request.ClientSessionId,
-            GoalType = request.GoalType, TargetValue = target, Mode = request.Mode,
-            Step3System = normalizedSystem, State = StudySessionStates.Active,
-            CreatedUtc = now, UpdatedUtc = now,
-            TargetEndUtc = request.GoalType == StudyGoalTypes.Duration ? now.AddMinutes(target) : null,
-            InitialMasteryScore = mastery?.MasteryScore, InitialMasteryState = mastery?.MasteryState ?? "",
-            InitialReadiness = dashboard.ExamReadinessProjectedPassPercent
-        };
-        await _sessions.InsertOneAsync(session);
-        return session;
-    }
-
-    public async Task<StudySession?> GetActiveAsync(string userId)
-    {
-        await CloseStaleAsync(userId, _clock.GetUtcNow().UtcDateTime);
-        return await _sessions.Find(value => value.UserId == userId && value.State == StudySessionStates.Active)
-            .SortByDescending(value => value.CreatedUtc).FirstOrDefaultAsync();
-    }
-
-    public async Task<StudySession?> GetOwnedAsync(string id, string userId) =>
-        await _sessions.Find(value => value.Id == id && value.UserId == userId).FirstOrDefaultAsync();
-
-    public async Task<StudySessionEnvelope?> RecordQuestionAsync(
-        string id, string userId, QuestionAttempt attempt, Question question, IReadOnlyCollection<CreditAward> awards)
-    {
-        var session = await GetOwnedAsync(id, userId);
-        if (session is null || session.State != StudySessionStates.Active) return null;
-        if (session.GoalType == StudyGoalTypes.DueReviews || session.GoalType == StudyGoalTypes.SimulationBlock) return null;
-        if (session.GoalType == StudyGoalTypes.WeakSystem
-            && Step3SystemCatalog.Normalize(question) != session.Step3System) return null;
-        if (!attempt.IsSkip)
-            await ApplyEventAsync(session, $"question:{attempt.Id}", 1, attempt.IsCorrect ? 1 : 0, 0, 0, awards);
-        return await EvaluateAsync(id, userId);
-    }
-
-    public async Task<StudySessionEnvelope?> RecordReviewAsync(
-        string id, string userId, QuestionReviewAttempt attempt, bool recovered, IReadOnlyCollection<CreditAward> awards)
-    {
-        var session = await GetOwnedAsync(id, userId);
-        if (session is null || session.State != StudySessionStates.Active || session.GoalType != StudyGoalTypes.DueReviews)
-            return null;
-        await ApplyEventAsync(session, $"review:{attempt.Id}", 0, attempt.IsCorrect ? 1 : 0, 1, recovered ? 1 : 0, awards);
-        return await EvaluateAsync(id, userId);
-    }
-
-    public async Task<StudySessionEnvelope?> FinishEarlyAsync(string id, string userId)
-    {
-        var now = _clock.GetUtcNow().UtcDateTime;
-        await _sessions.UpdateOneAsync(value => value.Id == id && value.UserId == userId
-            && value.State == StudySessionStates.Active,
-            Builders<StudySession>.Update.Set(value => value.State, StudySessionStates.EndedEarly)
-                .Set(value => value.CompletedUtc, now).Set(value => value.UpdatedUtc, now));
-        var session = await GetOwnedAsync(id, userId);
-        if (session is null) return null;
-        await SnapshotFinalAsync(session);
-        return Envelope(session);
-    }
-
-    public Task<StudySessionEnvelope?> CheckAsync(string id, string userId) => EvaluateAsync(id, userId);
-
-    public async Task<StudySession> EnsureSimulationBlockAsync(string userId, string simulationId, int block)
-    {
-        var clientId = $"simulation:{simulationId}:{block}";
-        var existing = await _sessions.Find(value => value.UserId == userId && value.ClientSessionId == clientId).FirstOrDefaultAsync();
-        if (existing is not null) return existing;
-        var now = _clock.GetUtcNow().UtcDateTime;
-        await _sessions.UpdateManyAsync(value => value.UserId == userId && value.State == StudySessionStates.Active,
-            Builders<StudySession>.Update.Set(value => value.State, StudySessionStates.Interrupted)
-                .Set(value => value.CompletedUtc, now).Set(value => value.UpdatedUtc, now));
-        var dashboard = await _dashboard.GetAsync(userId, now);
-        var session = new StudySession
-        {
-            UserId = userId, ClientSessionId = clientId, GoalType = StudyGoalTypes.SimulationBlock,
-            TargetValue = 1, Mode = "Simulation", State = StudySessionStates.Active,
-            SimulationId = simulationId, SimulationBlock = block, CreatedUtc = now, UpdatedUtc = now,
-            InitialReadiness = dashboard.ExamReadinessProjectedPassPercent
-        };
-        try { await _sessions.InsertOneAsync(session); }
-        catch (MongoWriteException) { return await _sessions.Find(value => value.UserId == userId && value.ClientSessionId == clientId).FirstAsync(); }
-        return session;
-    }
-
-    public async Task<StudySessionEnvelope> CompleteSimulationBlockAsync(string userId, string simulationId, int block)
-    {
-        var session = await EnsureSimulationBlockAsync(userId, simulationId, block);
-        if (session.State == StudySessionStates.Active)
-        {
-            var now = _clock.GetUtcNow().UtcDateTime;
-            await _sessions.UpdateOneAsync(value => value.Id == session.Id && value.State == StudySessionStates.Active,
-                Builders<StudySession>.Update.Set(value => value.QuestionsCompleted, 1)
-                    .Set(value => value.State, StudySessionStates.Completed).Set(value => value.CompletedUtc, now)
-                    .Set(value => value.UpdatedUtc, now));
-            session = (await GetOwnedAsync(session.Id!, userId))!;
-            await ApplyCompletionBonusAsync(session);
-            await SnapshotFinalAsync(session);
-        }
-        return Envelope((await GetOwnedAsync(session.Id!, userId))!);
-    }
-
-    public StudySessionEnvelope Envelope(StudySession session) => new()
-    {
-        Progress = Progress(session),
-        Summary = session.State == StudySessionStates.Active ? null : Summary(session)
-    };
-
-    private async Task ApplyEventAsync(
-        StudySession session, string eventId, int questions, int correct, int reviews, int recovered,
-        IReadOnlyCollection<CreditAward> awards)
-    {
-        var now = _clock.GetUtcNow().UtcDateTime;
-        var filter = Builders<StudySession>.Filter.Eq(value => value.Id, session.Id)
-            & Builders<StudySession>.Filter.Eq(value => value.State, StudySessionStates.Active)
-            & Builders<StudySession>.Filter.AnyNin(value => value.AppliedEventIds, [eventId]);
-        var update = Builders<StudySession>.Update.AddToSet(value => value.AppliedEventIds, eventId)
-            .Inc(value => value.QuestionsCompleted, questions).Inc(value => value.Correct, correct)
-            .Inc(value => value.ReviewsCompleted, reviews).Inc(value => value.Recovered, recovered)
-            .Inc(value => value.CoinsEarned, awards.Sum(value => value.Amount)).Set(value => value.UpdatedUtc, now);
-        foreach (var award in awards) update = update.Push(value => value.CoinAwards, award);
-        await _sessions.UpdateOneAsync(filter, update);
-    }
-
-    private async Task<StudySessionEnvelope?> EvaluateAsync(string id, string userId)
-    {
-        var session = await GetOwnedAsync(id, userId);
-        if (session is null) return null;
-        if (session.State == StudySessionStates.Active && Reached(session, _clock.GetUtcNow().UtcDateTime))
-        {
-            var now = _clock.GetUtcNow().UtcDateTime;
-            var changed = await _sessions.UpdateOneAsync(value => value.Id == id && value.UserId == userId
-                && value.State == StudySessionStates.Active,
-                Builders<StudySession>.Update.Set(value => value.State, StudySessionStates.Completed)
-                    .Set(value => value.CompletedUtc, now).Set(value => value.UpdatedUtc, now));
-            session = (await GetOwnedAsync(id, userId))!;
-            if (changed.ModifiedCount == 1)
-            {
-                await ApplyCompletionBonusAsync(session);
-                await SnapshotFinalAsync(session);
-                session = (await GetOwnedAsync(id, userId))!;
-            }
-        }
-        return Envelope(session);
-    }
-
-    private async Task ApplyCompletionBonusAsync(StudySession session)
-    {
-        if (!BonusEligible(session)) return;
-        var result = await _credits.AwardAsync(session.UserId, new CreditAwardRequest(
-            $"session:{session.Id}:complete", 3, CreditReasonCodes.SessionGoalComplete, "Completed a study session goal",
-            "study_session", session.Id!, true));
-        if (result.Award is null) return;
-        await _sessions.UpdateOneAsync(value => value.Id == session.Id,
-            Builders<StudySession>.Update.Inc(value => value.CoinsEarned, result.Award.Amount)
-                .Push(value => value.CoinAwards, result.Award));
-    }
-
-    private async Task SnapshotFinalAsync(StudySession session)
-    {
-        var dashboard = await _dashboard.GetAsync(session.UserId, _clock.GetUtcNow().UtcDateTime);
-        var mastery = dashboard.Systems.FirstOrDefault(value => value.System == session.Step3System);
-        await _sessions.UpdateOneAsync(value => value.Id == session.Id,
-            Builders<StudySession>.Update.Set(value => value.FinalMasteryScore, mastery == null ? null : mastery.MasteryScore)
-                .Set(value => value.FinalMasteryState, mastery?.MasteryState ?? "")
-                .Set(value => value.FinalReadiness, dashboard.ExamReadinessProjectedPassPercent));
-    }
-
-    private async Task CloseStaleAsync(string userId, DateTime now) =>
-        await _sessions.UpdateManyAsync(value => value.UserId == userId && value.State == StudySessionStates.Active
-            && value.UpdatedUtc < now.AddHours(-12),
-            Builders<StudySession>.Update.Set(value => value.State, StudySessionStates.Interrupted)
-                .Set(value => value.CompletedUtc, now).Set(value => value.UpdatedUtc, now));
-
-    private static bool Reached(StudySession session, DateTime now) => session.GoalType switch
-    {
-        StudyGoalTypes.Duration => session.TargetEndUtc <= now && session.QuestionsCompleted > 0,
-        StudyGoalTypes.DueReviews => session.ReviewsCompleted >= session.TargetValue,
-        _ => session.QuestionsCompleted >= session.TargetValue
-    };
-
-    private static bool BonusEligible(StudySession session) => session.GoalType switch
-    {
-        StudyGoalTypes.Duration => session.TargetValue >= 10 && session.QuestionsCompleted >= 5,
-        StudyGoalTypes.DueReviews => session.ReviewsCompleted >= 5,
-        StudyGoalTypes.SimulationBlock => true,
-        _ => session.QuestionsCompleted >= 5
-    };
-
-    private StudySessionProgress Progress(StudySession session)
-    {
-        var completed = session.GoalType == StudyGoalTypes.DueReviews ? session.ReviewsCompleted
-            : session.GoalType == StudyGoalTypes.Duration
-                ? Math.Min(session.TargetValue * 60, (int)((session.CompletedUtc ?? _clock.GetUtcNow().UtcDateTime) - session.CreatedUtc).TotalSeconds)
-                : session.QuestionsCompleted;
-        return new StudySessionProgress
-        {
-            Id = session.Id ?? "", State = session.State, GoalType = session.GoalType,
-            TargetValue = session.TargetValue, CompletedValue = completed,
-            QuestionsCompleted = session.QuestionsCompleted,
-            SecondsRemaining = session.TargetEndUtc.HasValue
-                ? Math.Max(0, (int)(session.TargetEndUtc.Value - _clock.GetUtcNow().UtcDateTime).TotalSeconds) : 0,
-            GoalReached = session.State == StudySessionStates.Completed
-        };
-    }
-
-    private StudySessionSummary Summary(StudySession session)
-    {
-        var progress = Progress(session);
-        return new StudySessionSummary
-        {
-            Id = session.Id ?? "", State = session.State, GoalType = session.GoalType,
-            TargetValue = session.TargetValue, CompletedValue = progress.CompletedValue,
-            QuestionsCompleted = session.QuestionsCompleted, Correct = session.Correct,
-            Accuracy = session.QuestionsCompleted == 0 ? 0 : (int)Math.Round(100.0 * session.Correct / session.QuestionsCompleted),
-            ReviewsCompleted = session.ReviewsCompleted, Recovered = session.Recovered,
-            ElapsedSeconds = Math.Max(0, (int)((session.CompletedUtc ?? _clock.GetUtcNow().UtcDateTime) - session.CreatedUtc).TotalSeconds),
-            CoinsEarned = session.CoinsEarned, CoinAwards = session.CoinAwards,
-            Step3System = session.Step3System,
-            MasteryScoreChange = session.InitialMasteryScore.HasValue && session.FinalMasteryScore.HasValue
-                ? session.FinalMasteryScore - session.InitialMasteryScore : null,
-            InitialMasteryState = session.InitialMasteryState, FinalMasteryState = session.FinalMasteryState,
-            ReadinessChange = session.InitialReadiness.HasValue && session.FinalReadiness.HasValue
-                ? session.FinalReadiness - session.InitialReadiness : null,
-            ReadinessExplanation = session.FinalReadiness != session.InitialReadiness
-                ? "Readiness changed after a completed exam simulation."
-                : "A completed exam simulation is required to update readiness.",
-            GoalBonusAwarded = session.CoinAwards.Any(value => value.ReasonCode == CreditReasonCodes.SessionGoalComplete)
-        };
-    }
-
-    private static void Validate(CreateStudySessionRequest request)
-    {
-        if (!Guid.TryParse(request.ClientSessionId, out _)) throw new ArgumentException("clientSessionId must be a UUID.");
-        if (!StudyGoalTypes.All.Contains(request.GoalType) || request.GoalType == StudyGoalTypes.SimulationBlock)
-            throw new ArgumentException("Unsupported study goal type.");
-        if (request.GoalType == StudyGoalTypes.WeakSystem && string.IsNullOrWhiteSpace(request.Step3System))
-            throw new ArgumentException("A Step 3 system is required for a weak-system goal.");
-        if (request.Mode is not ("Tutor" or "Timed")) throw new ArgumentException("mode must be Tutor or Timed.");
-    }
-}

api/QuestionsApi/Services/UserProfileStore.cs

@@ -20,8 +20,7 @@ public sealed class UserProfileStore
         "ExternalIdentities", "ExternalAuthTransactions",
         "FlashcardDecks", "FlashcardNotes", "FlashcardSchedules", "FlashcardReviewLogs",
         "FlashcardMediaAssets", "FlashcardSettings", "FlashcardImportPreviews",
-        "UserCreditAccounts", "CreditLedgerEntries", "StudySessions", "DailyMissionSets", "WeeklyGoals",
-        "UserProgressions", "ProgressionWeeklySnapshots"
+        "UserCreditAccounts"
     ];
 
     public UserProfileStore(MongoDatabaseProvider mongo)

api/QuestionsApi/Services/WeeklyGoalStore.cs

@@ -1,275 +0,0 @@
-using MongoDB.Driver;
-using QuestionsApi.Models;
-
-namespace QuestionsApi.Services;
-
-public sealed class WeeklyGoalStore
-{
-    private readonly IMongoCollection<WeeklyGoal> _goals;
-    private readonly IMongoCollection<QuestionAttempt> _attempts;
-    private readonly IMongoCollection<QuestionReviewAttempt> _reviews;
-    private readonly IMongoCollection<ReviewQueueItem> _queue;
-    private readonly IMongoCollection<FlashcardReviewLog> _flashReviews;
-    private readonly IMongoCollection<FlashcardSchedule> _flashSchedules;
-    private readonly IMongoCollection<FlashcardNote> _flashNotes;
-    private readonly IMongoCollection<CcsAttempt> _ccsAttempts;
-    private readonly IMongoCollection<StudySession> _studySessions;
-    private readonly IMongoCollection<ExamSimulation> _simulations;
-    private readonly QuestionStore _questions;
-    private readonly CreditStore _credits;
-    private readonly TimeProvider _clock;
-    private readonly ServiceMetrics _metrics;
-
-    public WeeklyGoalStore(MongoDatabaseProvider mongo, QuestionStore questions, CreditStore credits,
-        TimeProvider clock, ServiceMetrics metrics)
-    {
-        var db = mongo.Database;
-        _goals = db.GetCollection<WeeklyGoal>("WeeklyGoals");
-        _attempts = db.GetCollection<QuestionAttempt>("QuestionAttempts");
-        _reviews = db.GetCollection<QuestionReviewAttempt>("QuestionReviewAttempts");
-        _queue = db.GetCollection<ReviewQueueItem>("ReviewQueueItems");
-        _flashReviews = db.GetCollection<FlashcardReviewLog>("FlashcardReviewLogs");
-        _flashSchedules = db.GetCollection<FlashcardSchedule>("FlashcardSchedules");
-        _flashNotes = db.GetCollection<FlashcardNote>("FlashcardNotes");
-        _ccsAttempts = db.GetCollection<CcsAttempt>("CcsAttempts");
-        _studySessions = db.GetCollection<StudySession>("StudySessions");
-        _simulations = db.GetCollection<ExamSimulation>("ExamSimulations");
-        _questions = questions;
-        _credits = credits;
-        _clock = clock;
-        _metrics = metrics;
-        _goals.Indexes.CreateOne(new CreateIndexModel<WeeklyGoal>(
-            Builders<WeeklyGoal>.IndexKeys.Ascending(value => value.UserId).Ascending(value => value.WeekStartUtc),
-            new CreateIndexOptions { Unique = true, Name = "uq_weekly_goal_user_start" }));
-    }
-
-    public async Task<WeeklyGoalEnvelope> GetAsync(
-        string userId, DashboardResponse dashboard, IReadOnlyCollection<Question> published)
-    {
-        var now = _clock.GetUtcNow().UtcDateTime;
-        var awards = await FinalizeExpiredAsync(userId, now);
-        var start = WeekStart(now);
-        var goal = await _goals.Find(value => value.UserId == userId && value.WeekStartUtc == start)
-            .FirstOrDefaultAsync();
-        if (goal is null)
-        {
-            var reviewed = await _reviews.CountDocumentsAsync(value => value.UserId == userId && value.IsCorrect
-                && value.CreatedUtc >= start && value.CreatedUtc < start.AddDays(7));
-            var pending = await _queue.CountDocumentsAsync(value => value.UserId == userId
-                && value.State == ReviewQueueStates.Pending);
-            var availableReviews = checked((int)Math.Min(int.MaxValue, reviewed + pending));
-            var remediation = ChooseRemediation(availableReviews);
-            var eligible = SelectHardSystems(dashboard, published);
-            goal = new WeeklyGoal
-            {
-                Id = $"{userId}|{start:yyyy-MM-dd}", UserId = userId, WeekStartUtc = start,
-                ExpiresUtc = start.AddDays(7), CreatedUtc = now,
-                RemediationType = remediation.Type, RemediationTarget = remediation.Target,
-                EligibleSystems = eligible
-            };
-            try
-            {
-                await _goals.InsertOneAsync(goal);
-                _metrics.WeeklyGoalAssigned(goal.RemediationType);
-            }
-            catch (MongoWriteException exception) when (exception.WriteError.Category == ServerErrorCategory.DuplicateKey)
-            {
-                goal = await _goals.Find(value => value.UserId == userId && value.WeekStartUtc == start).FirstAsync();
-            }
-        }
-        var evaluated = await EvaluateAsync(goal);
-        awards.AddRange(evaluated.Awards);
-        return new WeeklyGoalEnvelope
-        {
-            State = evaluated.Response, CreditAwards = awards,
-            Credits = await _credits.GetStatusAsync(userId)
-        };
-    }
-
-    public static DateTime WeekStart(DateTime value)
-    {
-        var date = value.ToUniversalTime().Date;
-        var offset = ((int)date.DayOfWeek + 6) % 7;
-        return date.AddDays(-offset);
-    }
-
-    public static List<string> SelectHardSystems(
-        DashboardResponse dashboard, IReadOnlyCollection<Question> published)
-    {
-        var counts = published.Where(question => question.Difficulty >= 4)
-            .GroupBy(Step3SystemCatalog.Normalize).Where(group => group.Key is not null)
-            .ToDictionary(group => group.Key!, group => group.Count());
-        var ordered = dashboard.Systems.Where(system => counts.GetValueOrDefault(system.System) > 0)
-            .OrderBy(system => MasteryRank(system.MasteryState)).ThenBy(system => system.MasteryScore)
-            .ThenBy(system => system.Difficulty4PlusSuccessful).Select(system => system.System).ToList();
-        var result = new List<string>();
-        var available = 0;
-        foreach (var system in ordered)
-        {
-            result.Add(system);
-            available += counts[system];
-            if (available >= 5 || result.Count == 3) break;
-        }
-        return result;
-    }
-
-    public static (string Type, int Target) ChooseRemediation(int availableReviews) =>
-        availableReviews >= 5
-            ? (WeeklyRemediationTypes.Reviews, Math.Min(15, availableReviews))
-            : (WeeklyRemediationTypes.HardCorrect, 5);
-
-    public static int CountActiveDays(IEnumerable<DateTime> timestamps) =>
-        timestamps.Select(value => value.ToUniversalTime().Date).Distinct().Count();
-
-    public static bool QualifiesHardAttempt(WeeklyGoal goal, QuestionAttempt attempt, Question question) =>
-        !attempt.IsSkip && attempt.IsCorrect && attempt.CreatedUtc >= goal.WeekStartUtc
-        && attempt.CreatedUtc < goal.ExpiresUtc && question.Difficulty >= 4
-        && goal.EligibleSystems.Contains(Step3SystemCatalog.Normalize(question) ?? "");
-
-    private async Task<List<CreditAward>> FinalizeExpiredAsync(string userId, DateTime now)
-    {
-        var awards = new List<CreditAward>();
-        var expired = await _goals.Find(value => value.UserId == userId && value.ExpiresUtc <= now
-            && !value.ExpirationRecorded).ToListAsync();
-        foreach (var goal in expired)
-        {
-            var wasCompleted = goal.CompletedUtc.HasValue;
-            var result = await EvaluateAsync(goal);
-            awards.AddRange(result.Awards);
-            var latest = await _goals.Find(value => value.Id == goal.Id).FirstAsync();
-            var recorded = await _goals.UpdateOneAsync(value => value.Id == goal.Id && !value.ExpirationRecorded,
-                Builders<WeeklyGoal>.Update.Set(value => value.ExpirationRecorded, true));
-            if (recorded.ModifiedCount == 1 && !latest.CompletedUtc.HasValue) _metrics.WeeklyGoalExpiredIncomplete();
-            if (recorded.ModifiedCount == 1 && !wasCompleted && latest.CompletedUtc.HasValue)
-                _metrics.WeeklyGoalLateFinalized();
-        }
-        return awards;
-    }
-
-    private async Task<(WeeklyGoalResponse Response, List<CreditAward> Awards)> EvaluateAsync(WeeklyGoal goal)
-    {
-        var evidence = await EvidenceAsync(goal);
-        var complete = evidence.ActiveDays >= 4 && evidence.Systems.Count >= 3
-            && evidence.Remediation >= goal.RemediationTarget;
-        if (complete && !goal.CompletedUtc.HasValue)
-        {
-            var completedUtc = _clock.GetUtcNow().UtcDateTime;
-            var changed = await _goals.UpdateOneAsync(value => value.Id == goal.Id && value.CompletedUtc == null,
-                Builders<WeeklyGoal>.Update.Set(value => value.CompletedUtc, completedUtc));
-            goal.CompletedUtc = completedUtc;
-            if (changed.ModifiedCount == 1) _metrics.WeeklyGoalCompleted(goal.RemediationType);
-        }
-        var awards = new List<CreditAward>();
-        if (complete && !goal.RewardIssued)
-        {
-            var operationId = $"weekly-goal:{goal.Id}:complete";
-            var result = await _credits.AwardAsync(goal.UserId, new CreditAwardRequest(
-                operationId, 10, CreditReasonCodes.WeeklyGoalComplete,
-                "Completed the balanced weekly study goal", "weekly_goal", goal.Id, true));
-            if (result.Award is not null) awards.Add(result.Award);
-            var applied = result.Award ?? await _credits.GetAppliedAwardAsync(goal.UserId, operationId);
-            var amount = applied?.Amount ?? 0;
-            await _goals.UpdateOneAsync(value => value.Id == goal.Id && !value.RewardIssued,
-                Builders<WeeklyGoal>.Update.Set(value => value.RewardIssued, true)
-                    .Set(value => value.RewardAmount, amount));
-            goal.RewardIssued = true;
-            goal.RewardAmount = amount;
-        }
-        return (Response(goal, evidence), awards);
-    }
-
-    private async Task<WeeklyEvidence> EvidenceAsync(WeeklyGoal goal)
-    {
-        var start = goal.WeekStartUtc;
-        var end = goal.ExpiresUtc;
-        var attemptsTask = _attempts.Find(value => value.UserId == goal.UserId && !value.IsSkip
-            && value.CreatedUtc >= start && value.CreatedUtc < end).ToListAsync();
-        var reviewsTask = _reviews.Find(value => value.UserId == goal.UserId && value.IsCorrect
-            && value.CreatedUtc >= start && value.CreatedUtc < end).ToListAsync();
-        var flashTask = _flashReviews.Find(value => value.UserId == goal.UserId && value.UndoneUtc == null
-            && value.ReviewedUtc >= start && value.ReviewedUtc < end).ToListAsync();
-        var ccsTask = _ccsAttempts.Find(value => value.UserId == goal.UserId
-            && value.State == CcsAttemptStates.Completed && value.CompletedUtc >= start && value.CompletedUtc < end)
-            .ToListAsync();
-        var blocksTask = _studySessions.Find(value => value.UserId == goal.UserId
-            && value.GoalType == StudyGoalTypes.SimulationBlock && value.State == StudySessionStates.Completed
-            && value.CompletedUtc >= start && value.CompletedUtc < end).ToListAsync();
-        var simulationsTask = _simulations.Find(value => value.UserId == goal.UserId
-            && value.Responses.Any(response => response.UpdatedUtc >= start && response.UpdatedUtc < end)).ToListAsync();
-        await Task.WhenAll(attemptsTask, reviewsTask, flashTask, ccsTask, blocksTask, simulationsTask);
-
-        var attempts = attemptsTask.Result;
-        var reviews = reviewsTask.Result;
-        var flash = flashTask.Result;
-        var dates = attempts.Select(value => value.CreatedUtc)
-            .Concat(reviews.Select(value => value.CreatedUtc.Date))
-            .Concat(flash.Select(value => value.ReviewedUtc))
-            .Concat(ccsTask.Result.Select(value => value.CompletedUtc!.Value))
-            .Concat(blocksTask.Result.Select(value => value.CompletedUtc!.Value)).ToList();
-
-        var questionIds = attempts.Select(value => value.QuestionExternalId)
-            .Concat(reviews.Select(value => value.QuestionExternalId))
-            .Concat(simulationsTask.Result.SelectMany(value => value.Responses)
-                .Where(value => value.UpdatedUtc >= start && value.UpdatedUtc < end && !string.IsNullOrWhiteSpace(value.ChoiceId))
-                .Select(value => value.QuestionExternalId)).ToHashSet(StringComparer.Ordinal);
-        if (flash.Count > 0)
-        {
-            var cardIds = flash.Select(value => value.CardId).Distinct().ToList();
-            var schedules = await _flashSchedules.Find(value => cardIds.Contains(value.Id!)).ToListAsync();
-            var noteIds = schedules.Select(value => value.NoteId).Distinct().ToList();
-            var notes = await _flashNotes.Find(value => noteIds.Contains(value.Id!)
-                && value.SourceQuestionExternalId != "").ToListAsync();
-            foreach (var note in notes) questionIds.Add(note.SourceQuestionExternalId);
-        }
-        var questionMap = await _questions.GetByExternalIdsAsync(questionIds);
-        var systems = questionMap.Values.Select(Step3SystemCatalog.Normalize)
-            .Where(value => !string.IsNullOrWhiteSpace(value)).Select(value => value!).Distinct().ToHashSet();
-        var hardCorrect = attempts.Count(attempt => questionMap.TryGetValue(attempt.QuestionExternalId, out var question)
-            && QualifiesHardAttempt(goal, attempt, question));
-        return new WeeklyEvidence
-        {
-            ActiveDays = CountActiveDays(dates), Systems = systems,
-            Remediation = goal.RemediationType == WeeklyRemediationTypes.Reviews ? reviews.Count : hardCorrect
-        };
-    }
-
-    private static WeeklyGoalResponse Response(WeeklyGoal goal, WeeklyEvidence evidence)
-    {
-        var components = new List<WeeklyGoalComponentResponse>
-        {
-            Component("active_days", "Study on 4 different days", evidence.ActiveDays, 4),
-            Component("system_breadth", "Study 3 Step 3 systems", evidence.Systems.Count, 3),
-            Component(goal.RemediationType,
-                goal.RemediationType == WeeklyRemediationTypes.Reviews
-                    ? $"Complete {goal.RemediationTarget} scheduled reviews"
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-            Completed = progress >= target };
-
-    private static int MasteryRank(string state) => state switch
-    {
-        MasteryStates.Unseen => 0, MasteryStates.Learning => 1, MasteryStates.Practicing => 2,
-        MasteryStates.Strong => 3, _ => 4
-    };
-
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-        public HashSet<string> Systems { get; set; } = [];
-        public int Remediation { get; set; }
-    }
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