diff --git a/Core/YearTransition/GraduatingGradeResolver.cs b/Core/YearTransition/GraduatingGradeResolver.cs
new file mode 100644
index 0000000..4710e90
--- /dev/null
+++ b/Core/YearTransition/GraduatingGradeResolver.cs
@@ -0,0 +1,32 @@
+using Core.Models;
+
+namespace Core.YearTransition;
+
+/// <summary>
+/// Resolves the graduating grade from chapter school level configuration.
+/// </summary>
+public static class GraduatingGradeResolver
+{
+    /// <summary>
+    /// Middle school students graduate after grade 8; high school after grade 12.
+    /// Returns null when school level is unset (both / unspecified).
+    /// </summary>
+    public static int? FromSchoolLevel(SchoolLevel? schoolLevel) => schoolLevel switch
+    {
+        SchoolLevel.MiddleSchool => 8,
+        SchoolLevel.HighSchool => 12,
+        _ => null
+    };
+
+    /// <summary>
+    /// Human-readable label for wizard display.
+    /// </summary>
+    public static string Describe(SchoolLevel schoolLevel, int graduatingGrade) => schoolLevel switch
+    {
+        SchoolLevel.MiddleSchool =>
+            $"Middle school chapter — students graduate after grade {graduatingGrade}",
+        SchoolLevel.HighSchool =>
+            $"High school chapter — students graduate after grade {graduatingGrade}",
+        _ => $"Students graduate after grade {graduatingGrade}"
+    };
+}
diff --git a/Core/YearTransition/YearTransitionPlanner.cs b/Core/YearTransition/YearTransitionPlanner.cs
new file mode 100644
index 0000000..a7ad58b
--- /dev/null
+++ b/Core/YearTransition/YearTransitionPlanner.cs
@@ -0,0 +1,294 @@
+using Core.Entities;
+
+namespace Core.YearTransition;
+
+/// <summary>
+/// Inputs for building a year-transition plan.
+/// </summary>
+public sealed class YearTransitionRequest
+{
+    public required IReadOnlyList<Student> Students { get; init; }
+    public required IReadOnlySet<int> ReturningStudentIds { get; init; }
+    public IReadOnlyDictionary<OfficerRole, int?> OfficerAssignments { get; init; }
+        = new Dictionary<OfficerRole, int?>();
+    public required int GraduatingGrade { get; init; }
+    public required string TargetCompetitionYear { get; init; }
+    public IReadOnlyList<string> PastedNames { get; init; } = [];
+}
+
+/// <summary>
+/// Preview of a year transition before it is applied.
+/// </summary>
+public sealed class YearTransitionPlan
+{
+    public required string TargetCompetitionYear { get; init; }
+    public required int GraduatingGrade { get; init; }
+    public required IReadOnlyList<StudentPromotion> Promotions { get; init; }
+    public required IReadOnlyList<Student> StudentsToRemove { get; init; }
+    public required IReadOnlyList<OfficerAssignmentChange> OfficerChanges { get; init; }
+    public required IReadOnlyList<string> UnmatchedPastedNames { get; init; }
+    public required IReadOnlyList<string> AmbiguousPastedNames { get; init; }
+    public required IReadOnlyList<string> Warnings { get; init; }
+
+    public int ReturningCount => Promotions.Count;
+    public int RemovalCount => StudentsToRemove.Count;
+}
+
+public sealed class StudentPromotion
+{
+    public required Student Student { get; init; }
+    public required int PreviousGrade { get; init; }
+    public required int NewGrade { get; init; }
+    public required int PreviousTsaYear { get; init; }
+    public required int NewTsaYear { get; init; }
+    public OfficerRole? PreviousOfficerRole { get; init; }
+    public OfficerRole? NewOfficerRole { get; init; }
+}
+
+public sealed class OfficerAssignmentChange
+{
+    public required OfficerRole Role { get; init; }
+    public Student? NewOfficer { get; init; }
+    public Student? PreviousOfficer { get; init; }
+}
+
+/// <summary>
+/// Pure planner for year-end student promotion, graduation, and officer assignment.
+/// </summary>
+public static class YearTransitionPlanner
+{
+    private const int AbsoluteMaxGrade = 12;
+
+    /// <summary>
+    /// Students at or above the graduating grade are suggested as non-returning.
+    /// </summary>
+    public static bool SuggestReturning(Student student, int graduatingGrade) =>
+        student.Grade < graduatingGrade;
+
+    /// <summary>
+    /// Parses pasted name lines and matches them to students.
+    /// </summary>
+    public static NameMatchResult MatchPastedNames(
+        IReadOnlyList<Student> students,
+        IEnumerable<string> pastedLines)
+    {
+        var matchedIds = new HashSet<int>();
+        var unmatched = new List<string>();
+        var ambiguous = new List<string>();
+
+        foreach (var rawLine in pastedLines)
+        {
+            var line = rawLine.Trim();
+            if (string.IsNullOrWhiteSpace(line))
+                continue;
+
+            var matches = FindNameMatches(students, line).ToList();
+            if (matches.Count == 0)
+            {
+                unmatched.Add(line);
+            }
+            else if (matches.Count > 1)
+            {
+                ambiguous.Add(line);
+                foreach (var match in matches)
+                    matchedIds.Add(match.Id);
+            }
+            else
+            {
+                matchedIds.Add(matches[0].Id);
+            }
+        }
+
+        return new NameMatchResult(matchedIds, unmatched, ambiguous);
+    }
+
+    public static YearTransitionPlan Build(YearTransitionRequest request)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        if (request.GraduatingGrade is < 5 or > AbsoluteMaxGrade)
+            throw new ArgumentOutOfRangeException(nameof(request), "Graduating grade must be between 5 and 12.");
+
+        var studentsById = request.Students.ToDictionary(s => s.Id);
+        var warnings = new List<string>();
+        var promotions = new List<StudentPromotion>();
+        var toRemove = new List<Student>();
+
+        var nameMatch = MatchPastedNames(request.Students, request.PastedNames);
+        warnings.AddRange(nameMatch.AmbiguousNames.Select(n =>
+            $"Pasted name '{n}' matched more than one student."));
+
+        // Officer role -> student id from request (null = vacant)
+        var newOfficerByRole = Enum.GetValues<OfficerRole>()
+            .ToDictionary(
+                role => role,
+                role => request.OfficerAssignments.TryGetValue(role, out var id) ? id : null);
+
+        // Detect same student assigned to multiple offices
+        var assignedStudentIds = newOfficerByRole.Values
+            .Where(id => id.HasValue)
+            .Select(id => id!.Value)
+            .ToList();
+        var duplicateOfficerStudents = assignedStudentIds
+            .GroupBy(id => id)
+            .Where(g => g.Count() > 1)
+            .Select(g => g.Key)
+            .ToHashSet();
+
+        foreach (var studentId in duplicateOfficerStudents)
+        {
+            if (studentsById.TryGetValue(studentId, out var student))
+            {
+                warnings.Add($"{student.LastNameFirstName} is assigned to more than one officer role.");
+            }
+        }
+
+        // Build new officer role lookup for returning students
+        var newRoleByStudentId = new Dictionary<int, OfficerRole>();
+        foreach (var (role, studentId) in newOfficerByRole)
+        {
+            if (!studentId.HasValue)
+                continue;
+
+            if (!request.ReturningStudentIds.Contains(studentId.Value))
+            {
+                var name = studentsById.TryGetValue(studentId.Value, out var s)
+                    ? s.LastNameFirstName
+                    : $"Id {studentId.Value}";
+                warnings.Add($"{role} is assigned to {name}, who is not marked returning.");
+                continue;
+            }
+
+            if (duplicateOfficerStudents.Contains(studentId.Value))
+                continue;
+
+            newRoleByStudentId[studentId.Value] = role;
+        }
+
+        foreach (var student in request.Students.OrderBy(s => s.LastName).ThenBy(s => s.FirstName))
+        {
+            if (request.ReturningStudentIds.Contains(student.Id))
+            {
+                var newGrade = Math.Min(AbsoluteMaxGrade,
+                    Math.Min(request.GraduatingGrade, student.Grade + 1));
+                var newTsaYear = student.TsaYear + 1;
+
+                if (student.Grade >= request.GraduatingGrade)
+                {
+                    warnings.Add(
+                        $"{student.LastNameFirstName} is at or above graduating grade {request.GraduatingGrade} but marked returning; grade stays at {newGrade}.");
+                }
+
+                OfficerRole? assignedRole = newRoleByStudentId.TryGetValue(student.Id, out var role)
+                    ? role
+                    : null;
+
+                promotions.Add(new StudentPromotion
+                {
+                    Student = student,
+                    PreviousGrade = student.Grade,
+                    NewGrade = newGrade,
+                    PreviousTsaYear = student.TsaYear,
+                    NewTsaYear = newTsaYear,
+                    PreviousOfficerRole = student.OfficerRole,
+                    NewOfficerRole = assignedRole
+                });
+            }
+            else
+            {
+                toRemove.Add(student);
+            }
+        }
+
+        var officerChanges = Enum.GetValues<OfficerRole>()
+            .Select(role =>
+            {
+                var previous = request.Students.FirstOrDefault(s => s.OfficerRole == role);
+                Student? next = null;
+                if (newOfficerByRole.TryGetValue(role, out var nextId) &&
+                    nextId.HasValue &&
+                    studentsById.TryGetValue(nextId.Value, out var nextStudent) &&
+                    request.ReturningStudentIds.Contains(nextId.Value) &&
+                    !duplicateOfficerStudents.Contains(nextId.Value))
+                {
+                    next = nextStudent;
+                }
+
+                return new OfficerAssignmentChange
+                {
+                    Role = role,
+                    PreviousOfficer = previous,
+                    NewOfficer = next
+                };
+            })
+            .ToList();
+
+        return new YearTransitionPlan
+        {
+            TargetCompetitionYear = request.TargetCompetitionYear,
+            GraduatingGrade = request.GraduatingGrade,
+            Promotions = promotions,
+            StudentsToRemove = toRemove,
+            OfficerChanges = officerChanges,
+            UnmatchedPastedNames = nameMatch.UnmatchedNames,
+            AmbiguousPastedNames = nameMatch.AmbiguousNames,
+            Warnings = warnings
+        };
+    }
+
+    private static IEnumerable<Student> FindNameMatches(IReadOnlyList<Student> students, string line)
+    {
+        var comparer = StringComparer.OrdinalIgnoreCase;
+
+        // Exact full-name matches first
+        var fullMatches = students.Where(s =>
+            comparer.Equals(s.FirstNameLastName, line) ||
+            comparer.Equals(s.LastNameFirstName, line)).ToList();
+        if (fullMatches.Count > 0)
+            return fullMatches;
+
+        var (first, last) = ParseName(line);
+        if (string.IsNullOrWhiteSpace(first) && string.IsNullOrWhiteSpace(last))
+            return [];
+
+        return students.Where(s =>
+            comparer.Equals(s.FirstName.Trim(), first) &&
+            comparer.Equals(s.LastName.Trim(), last));
+    }
+
+    /// <summary>
+    /// Parses a name line into (first, last), using <see cref="Student.ParseNameParts"/> for
+    /// "Last, First" and a last-space split for "First Last".
+    /// </summary>
+    private static (string First, string Last) ParseName(string fullName)
+    {
+        var trimmed = fullName.Trim();
+        if (trimmed.Contains(','))
+        {
+            var parts = Student.ParseNameParts(trimmed);
+            return (parts.Item1.Trim(), parts.Item2.Trim());
+        }
+
+        var lastSpace = trimmed.LastIndexOf(' ');
+        if (lastSpace <= 0)
+            return (trimmed, string.Empty);
+
+        return (trimmed[..lastSpace].Trim(), trimmed[(lastSpace + 1)..].Trim());
+    }
+}
+
+public sealed class NameMatchResult
+{
+    public NameMatchResult(
+        IReadOnlySet<int> matchedStudentIds,
+        IReadOnlyList<string> unmatchedNames,
+        IReadOnlyList<string> ambiguousNames)
+    {
+        MatchedStudentIds = matchedStudentIds;
+        UnmatchedNames = unmatchedNames;
+        AmbiguousNames = ambiguousNames;
+    }
+
+    public IReadOnlySet<int> MatchedStudentIds { get; }
+    public IReadOnlyList<string> UnmatchedNames { get; }
+    public IReadOnlyList<string> AmbiguousNames { get; }
+}
diff --git a/DEPLOYMENT.md b/DEPLOYMENT.md
index e8b12f0..d24db05 100644
--- a/DEPLOYMENT.md
+++ b/DEPLOYMENT.md
@@ -172,6 +172,31 @@ docker-compose logs -f webapp
 
 ---
 
+## Data Persistence (SQLite + Backups)
+
+The app stores its SQLite database and runtime config under **`Data/`** (capital D) relative to the content root:
+
+| Path in container | Purpose |
+|-------------------|---------|
+| `/app/Data/app.db` | Live SQLite database |
+| `/app/Data/appsettings.json` | Chapter settings overrides (e.g. CompetitionYear) |
+| `/app/Data/backups/pre-rollover-*.db` | Automatic backups created by New Year Rollover |
+
+**Docker volume mount must use capital `Data`:**
+
+```yaml
+volumes:
+  - ./data:/app/Data
+```
+
+On Linux, `./data:/app/data` is a **different** path and will not persist the database or rollover backups. After a correct mount, host files appear under `./data/` (for example `./data/app.db` and `./data/backups/`).
+
+Ensure the container user can write to the mounted directory (the image runs as a non-root `APP_UID`). If directory creation for `backups/` fails, year rollover aborts before changing data.
+
+For the rollover workflow itself, see `docs/instructions/year-rollover.md`.
+
+---
+
 ## Managing Users
 
 ### Adding a New User
@@ -310,10 +335,11 @@ curl http://localhost:8080
 - [ ] Set file permissions to 600
 - [ ] Configured HTTPS/SSL certificates
 - [ ] Updated `ASPNETCORE_URLS` for production domain
-- [ ] Configured volume for database persistence
+- [ ] Configured volume for database persistence as `./data:/app/Data` (capital D)
+- [ ] Verified `app.db` appears on the host under `./data/` after first run
 - [ ] Removed development endpoints (already done in code)
 - [ ] Set up log monitoring
-- [ ] Configured automatic backups
+- [ ] Confirmed year-rollover backups write to `./data/backups/` (see `docs/instructions/year-rollover.md`)
 - [ ] Tested login with all user roles
 - [ ] Tested rate limiting (5 failed attempts)
 - [ ] Documented admin password securely
diff --git a/Tests/YearTransition/YearTransitionPlanner_Tests.cs b/Tests/YearTransition/YearTransitionPlanner_Tests.cs
new file mode 100644
index 0000000..6e40132
--- /dev/null
+++ b/Tests/YearTransition/YearTransitionPlanner_Tests.cs
@@ -0,0 +1,230 @@
+using Core.Entities;
+using Core.Models;
+using Core.YearTransition;
+using NUnit.Framework;
+using Tests.Builders;
+
+namespace Tests.YearTransition;
+
+[TestFixture]
+public class GraduatingGradeResolver_Tests
+{
+    [Test]
+    public void FromSchoolLevel_MiddleSchool_Returns8()
+    {
+        Assert.That(GraduatingGradeResolver.FromSchoolLevel(SchoolLevel.MiddleSchool), Is.EqualTo(8));
+    }
+
+    [Test]
+    public void FromSchoolLevel_HighSchool_Returns12()
+    {
+        Assert.That(GraduatingGradeResolver.FromSchoolLevel(SchoolLevel.HighSchool), Is.EqualTo(12));
+    }
+
+    [Test]
+    public void FromSchoolLevel_Null_ReturnsNull()
+    {
+        Assert.That(GraduatingGradeResolver.FromSchoolLevel(null), Is.Null);
+    }
+}
+
+[TestFixture]
+public class YearTransitionPlanner_Tests
+{
+    [SetUp]
+    public void SetUp()
+    {
+        StudentBuilder.ResetIdCounter();
+    }
+
+    [Test]
+    public void SuggestReturning_BelowGraduatingGrade_IsTrue()
+    {
+        var student = StudentBuilder.Create("Ann", "Lee").WithGrade(7).Build();
+        Assert.That(YearTransitionPlanner.SuggestReturning(student, graduatingGrade: 8), Is.True);
+    }
+
+    [Test]
+    public void SuggestReturning_AtGraduatingGrade_IsFalse()
+    {
+        var student = StudentBuilder.Create("Ann", "Lee").WithGrade(8).Build();
+        Assert.That(YearTransitionPlanner.SuggestReturning(student, graduatingGrade: 8), Is.False);
+    }
+
+    [Test]
+    public void Build_PromotesReturningStudents_MiddleSchool()
+    {
+        var returning = StudentBuilder.Create("Ann", "Lee").WithGrade(6).WithTsaYear(1).Build();
+        var graduating = StudentBuilder.Create("Bob", "Smith").WithGrade(8).WithTsaYear(3).Build();
+
+        var plan = YearTransitionPlanner.Build(new YearTransitionRequest
+        {
+            Students = [returning, graduating],
+            ReturningStudentIds = new HashSet<int> { returning.Id },
+            GraduatingGrade = 8,
+            TargetCompetitionYear = "2027"
+        });
+
+        Assert.That(plan.ReturningCount, Is.EqualTo(1));
+        Assert.That(plan.RemovalCount, Is.EqualTo(1));
+        Assert.That(plan.Promotions[0].NewGrade, Is.EqualTo(7));
+        Assert.That(plan.Promotions[0].NewTsaYear, Is.EqualTo(2));
+        Assert.That(plan.StudentsToRemove[0].Id, Is.EqualTo(graduating.Id));
+    }
+
+    [Test]
+    public void Build_CapsGradeAtGraduatingGrade_HighSchool()
+    {
+        var senior = StudentBuilder.Create("Chris", "Young").WithGrade(12).WithTsaYear(4).Build();
+
+        var plan = YearTransitionPlanner.Build(new YearTransitionRequest
+        {
+            Students = [senior],
+            ReturningStudentIds = new HashSet<int> { senior.Id },
+            GraduatingGrade = 12,
+            TargetCompetitionYear = "2027"
+        });
+
+        Assert.That(plan.Promotions[0].NewGrade, Is.EqualTo(12));
+        Assert.That(plan.Promotions[0].NewTsaYear, Is.EqualTo(5));
+        Assert.That(plan.Warnings, Has.Some.Contain("graduating grade"));
+    }
+
+    [Test]
+    public void Build_CapsGradeAtEight_WhenMiddleSchoolReturnerAtGraduatingGrade()
+    {
+        var eighth = StudentBuilder.Create("Dana", "Nguyen").WithGrade(8).WithTsaYear(2).Build();
+
+        var plan = YearTransitionPlanner.Build(new YearTransitionRequest
+        {
+            Students = [eighth],
+            ReturningStudentIds = new HashSet<int> { eighth.Id },
+            GraduatingGrade = 8,
+            TargetCompetitionYear = "2027"
+        });
+
+        Assert.That(plan.Promotions[0].NewGrade, Is.EqualTo(8));
+        Assert.That(plan.Warnings, Has.Some.Contain("graduating grade"));
+    }
+
+    [Test]
+    public void Build_AssignsOfficersAndClearsOthers()
+    {
+        var president = StudentBuilder.Create("Eve", "Adams").WithGrade(7).AsPresident().Build();
+        var vp = StudentBuilder.Create("Frank", "Baker").WithGrade(6).Build();
+
+        var plan = YearTransitionPlanner.Build(new YearTransitionRequest
+        {
+            Students = [president, vp],
+            ReturningStudentIds = new HashSet<int> { president.Id, vp.Id },
+            GraduatingGrade = 8,
+            TargetCompetitionYear = "2027",
+            OfficerAssignments = new Dictionary<OfficerRole, int?>
+            {
+                [OfficerRole.President] = vp.Id,
+                [OfficerRole.VicePresident] = president.Id
+            }
+        });
+
+        var eve = plan.Promotions.Single(p => p.Student.Id == president.Id);
+        var frank = plan.Promotions.Single(p => p.Student.Id == vp.Id);
+
+        Assert.That(eve.PreviousOfficerRole, Is.EqualTo(OfficerRole.President));
+        Assert.That(eve.NewOfficerRole, Is.EqualTo(OfficerRole.VicePresident));
+        Assert.That(frank.NewOfficerRole, Is.EqualTo(OfficerRole.President));
+
+        var presidentChange = plan.OfficerChanges.Single(c => c.Role == OfficerRole.President);
+        Assert.That(presidentChange.PreviousOfficer!.Id, Is.EqualTo(president.Id));
+        Assert.That(presidentChange.NewOfficer!.Id, Is.EqualTo(vp.Id));
+    }
+
+    [Test]
+    public void Build_WarnsWhenOfficerAssignedToNonReturningStudent()
+    {
+        var returning = StudentBuilder.Create("Gina", "Cole").WithGrade(6).Build();
+        var leaving = StudentBuilder.Create("Hank", "Diaz").WithGrade(8).Build();
+
+        var plan = YearTransitionPlanner.Build(new YearTransitionRequest
+        {
+            Students = [returning, leaving],
+            ReturningStudentIds = new HashSet<int> { returning.Id },
+            GraduatingGrade = 8,
+            TargetCompetitionYear = "2027",
+            OfficerAssignments = new Dictionary<OfficerRole, int?>
+            {
+                [OfficerRole.President] = leaving.Id
+            }
+        });
+
+        Assert.That(plan.Warnings, Has.Some.Contain("not marked returning"));
+        Assert.That(plan.Promotions[0].NewOfficerRole, Is.Null);
+    }
+
+    [Test]
+    public void Build_WarnsWhenSameStudentHasTwoOffices()
+    {
+        var student = StudentBuilder.Create("Ivy", "Evans").WithGrade(7).Build();
+
+        var plan = YearTransitionPlanner.Build(new YearTransitionRequest
+        {
+            Students = [student],
+            ReturningStudentIds = new HashSet<int> { student.Id },
+            GraduatingGrade = 8,
+            TargetCompetitionYear = "2027",
+            OfficerAssignments = new Dictionary<OfficerRole, int?>
+            {
+                [OfficerRole.President] = student.Id,
+                [OfficerRole.Treasurer] = student.Id
+            }
+        });
+
+        Assert.That(plan.Warnings, Has.Some.Contain("more than one officer role"));
+        Assert.That(plan.Promotions[0].NewOfficerRole, Is.Null);
+    }
+
+    [Test]
+    public void MatchPastedNames_MatchesLastCommaFirstAndFirstLast()
+    {
+        var a = StudentBuilder.Create("Ann", "Lee").WithGrade(6).Build();
+        var b = StudentBuilder.Create("Bob", "Smith").WithGrade(7).Build();
+
+        var result = YearTransitionPlanner.MatchPastedNames(
+            [a, b],
+            ["Lee, Ann", "Bob Smith", "Nobody Here"]);
+
+        Assert.That(result.MatchedStudentIds, Is.EquivalentTo(new[] { a.Id, b.Id }));
+        Assert.That(result.UnmatchedNames, Is.EquivalentTo(new[] { "Nobody Here" }));
+    }
+
+    [Test]
+    public void MatchPastedNames_AmbiguousWhenDuplicateNames()
+    {
+        var a = StudentBuilder.Create("Ann", "Lee").WithGrade(6).Build();
+        var b = StudentBuilder.Create("Ann", "Lee").WithGrade(7).Build();
+
+        var result = YearTransitionPlanner.MatchPastedNames([a, b], ["Ann Lee"]);
+
+        Assert.That(result.AmbiguousNames, Is.EquivalentTo(new[] { "Ann Lee" }));
+        Assert.That(result.MatchedStudentIds, Is.EquivalentTo(new[] { a.Id, b.Id }));
+    }
+
+    [Test]
+    public void Build_IncludesUnmatchedAndAmbiguousFromPaste()
+    {
+        var a = StudentBuilder.Create("Ann", "Lee").WithGrade(6).Build();
+        var b = StudentBuilder.Create("Ann", "Lee").WithGrade(7).Build();
+
+        var plan = YearTransitionPlanner.Build(new YearTransitionRequest
+        {
+            Students = [a, b],
+            ReturningStudentIds = new HashSet<int> { a.Id },
+            GraduatingGrade = 8,
+            TargetCompetitionYear = "2027",
+            PastedNames = ["Ann Lee", "Zed Zulu"]
+        });
+
+        Assert.That(plan.AmbiguousPastedNames, Has.Member("Ann Lee"));
+        Assert.That(plan.UnmatchedPastedNames, Has.Member("Zed Zulu"));
+        Assert.That(plan.Warnings, Has.Some.Contain("matched more than one"));
+    }
+}
diff --git a/WebApp/Components/Pages/ChapterSettings.razor b/WebApp/Components/Pages/ChapterSettings.razor
index b032e85..7bb82dc 100644
--- a/WebApp/Components/Pages/ChapterSettings.razor
+++ b/WebApp/Components/Pages/ChapterSettings.razor
@@ -3,10 +3,10 @@
 @using WebApp.Authentication
 @using WebApp.Models
 @using WebApp.Components.Shared.Components
-@using System.Text.Json
+@using WebApp.Services
 @using Core.Models
-@inject IWebHostEnvironment Environment
 @inject IConfiguration Configuration
+@inject IChapterSettingsWriter ChapterSettingsWriter
 
 @rendermode InteractiveServer
 
@@ -125,19 +125,10 @@
 
     protected override void OnInitialized()
     {
-        // Load from IConfiguration
         _settings = Configuration.GetSection("ChapterSettings").Get<Models.ChapterSettings>()
                   ?? new Models.ChapterSettings();
     }
 
-    private string GetAppSettingsPath()
-    {
-        return Path.Combine(
-            Environment.ContentRootPath,
-            "Data",
-            "appsettings.json");
-    }
-
     private async Task SaveSettings()
     {
         if (_settings == null) return;
@@ -147,41 +138,7 @@
 
         try
         {
-            var appSettingsPath = GetAppSettingsPath();
-
-            // Ensure Data directory exists
-            var dataDir = Path.GetDirectoryName(appSettingsPath);
-            if (dataDir != null && !Directory.Exists(dataDir))
-            {
-                Directory.CreateDirectory(dataDir);
-            }
-
-            // Read existing appsettings or create new
-            JsonDocument? existingDoc = null;
-            Dictionary<string, object?> settings;
-
-            if (File.Exists(appSettingsPath))
-            {
-                var existingJson = await File.ReadAllTextAsync(appSettingsPath);
-                existingDoc = JsonDocument.Parse(existingJson);
-                settings = JsonSerializer.Deserialize<Dictionary<string, object?>>(existingJson)
-                          ?? new Dictionary<string, object?>();
-            }
-            else
-            {
-                settings = new Dictionary<string, object?>();
-            }
-
-            // Update ChapterSettings section
-            settings["ChapterSettings"] = _settings;
-
-            // Write back to file
-            var options = new JsonSerializerOptions { WriteIndented = true };
-            var json = JsonSerializer.Serialize(settings, options);
-            await File.WriteAllTextAsync(appSettingsPath, json);
-
-            existingDoc?.Dispose();
-
+            await ChapterSettingsWriter.WriteAsync(_settings);
             _statusMessage = "Settings saved successfully! Changes will take effect on next application restart.";
             _statusSeverity = Severity.Success;
         }
diff --git a/WebApp/Components/Pages/YearRollover.razor b/WebApp/Components/Pages/YearRollover.razor
new file mode 100644
index 0000000..8c22a50
--- /dev/null
+++ b/WebApp/Components/Pages/YearRollover.razor
@@ -0,0 +1,651 @@
+@page "/settings/new-year"
+@attribute [Authorize(Roles = AuthRoles.Administrator)]
+@implements IAsyncDisposable
+@using Core.Entities
+@using Core.Models
+@using Core.YearTransition
+@using Data
+@using Microsoft.EntityFrameworkCore
+@using WebApp.Authentication
+@using WebApp.Components.Shared.Components
+@using WebApp.Services
+@inject AppDbContext Context
+@inject IConfiguration Configuration
+@inject IYearRolloverService YearRolloverService
+@inject IDialogService DialogService
+@inject ISnackbar Snackbar
+@inject ILogger<YearRollover> Logger
+
+@rendermode InteractiveServer
+
+<PageHeader
+    Title="New Year Rollover"
+    Description="Promote returning students, set officers, and clear last season's data after an automatic database backup."
+    ShowBackButton="true"
+    BackButtonUrl="/settings/chapter" />
+
+<MudContainer MaxWidth="MaxWidth.Large" Class="mt-4 mb-8">
+    @if (_result != null)
+    {
+        <MudAlert Severity="Severity.Success" Class="mb-4" Variant="Variant.Filled">
+            Rollover to @_result.CompetitionYear completed successfully.
+        </MudAlert>
+        <MudPaper Class="pa-6 mb-4">
+            <MudText Typo="Typo.h5" Class="mb-3">Summary</MudText>
+            <MudText>Backup: <code>@_result.BackupPath</code></MudText>
+            <MudText>Students promoted: @_result.StudentsPromoted</MudText>
+            <MudText>Students removed: @_result.StudentsRemoved</MudText>
+            <MudText>Teams deleted: @_result.TeamsDeleted</MudText>
+            <MudText>Event rankings deleted: @_result.RankingsDeleted</MudText>
+            <MudText>Meeting histories deleted: @_result.MeetingHistoriesDeleted</MudText>
+            <MudText>Event occurrences deleted: @_result.EventOccurrencesDeleted</MudText>
+            <MudText Typo="Typo.subtitle1" Class="mt-3 mb-1">Officers</MudText>
+            <MudList T="string" Dense="true">
+                @foreach (var line in _result.OfficerSummary)
+                {
+                    <MudListItem T="string" Icon="@Icons.Material.Filled.Badge">@line</MudListItem>
+                }
+            </MudList>
+            <MudAlert Severity="Severity.Info" Class="mt-4" Dense="true">
+                Restart the application so printouts and the home page show the new competition year.
+                Then add new students, import the new state schedule, and clear Meeting Schedule browser state with Reset.
+            </MudAlert>
+        </MudPaper>
+    }
+    else if (_students == null)
+    {
+        <MudProgressCircular Indeterminate="true" />
+    }
+    else if (!_wizardUnlocked)
+    {
+        <MudPaper Class="pa-6 mb-4">
+            <MudAlert Severity="Severity.Error" Variant="Variant.Filled" Class="mb-4" Icon="@Icons.Material.Filled.Lock">
+                This wizard permanently changes production chapter data. It is locked until you intentionally unlock it.
+            </MudAlert>
+
+            <MudText Typo="Typo.h5" Class="mb-3">Before you continue</MudText>
+            <MudText Typo="Typo.body2" Class="mb-3">
+                Unlocking lets you plan a rollover. Applying it will still require a second typed confirmation.
+                An automatic database backup is created immediately before apply and is the only undo.
+            </MudText>
+
+            <MudList T="string" Dense="true" Class="mb-4">
+                <MudListItem T="string" Icon="@Icons.Material.Filled.DeleteForever" IconColor="Color.Error">
+                    Non-returning students are permanently deleted
+                </MudListItem>
+                <MudListItem T="string" Icon="@Icons.Material.Filled.Groups" IconColor="Color.Error">
+                    All teams, event rankings, and meeting history are cleared
+                </MudListItem>
+                <MudListItem T="string" Icon="@Icons.Material.Filled.Event" IconColor="Color.Warning">
+                    Event occurrences are cleared by default (state schedule)
+                </MudListItem>
+            </MudList>
+
+            <MudCheckBox @bind-Value="_ackDestructive" Color="Color.Error" Class="mb-2"
+                         Label="I understand this permanently deletes students and season data" />
+            <MudCheckBox @bind-Value="_ackBackupOnlyUndo" Color="Color.Error" Class="mb-4"
+                         Label="I understand the automatic backup is the only undo" />
+
+            <MudTextField @bind-Value="_unlockPhrase"
+                          Label="@($"Type {UnlockPhrase} to unlock")"
+                          Variant="Variant.Outlined"
+                          HelperText="@($"Confirmation is case-insensitive. Type exactly: {UnlockPhrase}")"
+                          Class="mb-4"
+                          Style="max-width: 320px;"
+                          Immediate="true" />
+
+            <MudButton Variant="Variant.Filled"
+                       Color="Color.Error"
+                       StartIcon="@Icons.Material.Filled.LockOpen"
+                       Disabled="!CanUnlockWizard"
+                       OnClick="UnlockWizard">
+                Unlock wizard
+            </MudButton>
+        </MudPaper>
+    }
+    else
+    {
+        <MudAlert Severity="Severity.Warning" Dense="true" Class="mb-3" Icon="@Icons.Material.Filled.LockOpen">
+            Wizard unlocked for this session. Close or refresh this page to lock it again.
+            <MudButton Variant="Variant.Text" Size="Size.Small" Color="Color.Default" Class="ml-2" OnClick="LockWizard">
+                Lock again
+            </MudButton>
+        </MudAlert>
+
+        <MudStepper @bind-ActiveIndex="Step" Class="mb-4">
+            <MudStep Title="Year">Year &amp; grades</MudStep>
+            <MudStep Title="Roster">Returning roster</MudStep>
+            <MudStep Title="Officers">Officers</MudStep>
+            <MudStep Title="Reset">Season reset</MudStep>
+            <MudStep Title="Apply">Preview &amp; apply</MudStep>
+        </MudStepper>
+
+        @if (Step == 0)
+        {
+            <MudPaper Class="pa-6 mb-4">
+                <MudText Typo="Typo.h5" Class="mb-3">Competition year</MudText>
+                <MudTextField @bind-Value="_targetYear"
+                              Label="Target competition year"
+                              Variant="Variant.Outlined"
+                              HelperText="Defaults to current year + 1"
+                              Class="mb-4"
+                              Style="max-width: 200px;" />
+
+                <MudText Typo="Typo.h5" Class="mb-2">Chapter type</MudText>
+                @if (_configuredSchoolLevel is { } configured)
+                {
+                    <MudAlert Severity="Severity.Info" Dense="true" Class="mb-3">
+                        @GraduatingGradeResolver.Describe(configured, _graduatingGrade!.Value)
+                        <MudLink Href="/settings/chapter" Class="ml-2">Change in Chapter Settings</MudLink>
+                    </MudAlert>
+                }
+                else
+                {
+                    <MudAlert Severity="Severity.Warning" Dense="true" Class="mb-3">
+                        School level is not set in Chapter Settings (Both MS and HS). Choose the chapter type for this rollover,
+                        then set it permanently on the <MudLink Href="/settings/chapter">Chapter Settings</MudLink> page.
+                    </MudAlert>
+                    <MudSelect T="SchoolLevel?" Value="_overrideSchoolLevel" Label="Chapter type for this rollover"
+                               Variant="Variant.Outlined" Class="mb-3" Style="max-width: 320px;"
+                               ValueChanged="OnOverrideSchoolLevelChanged">
+                        <MudSelectItem T="SchoolLevel?" Value="@SchoolLevel.MiddleSchool">Middle School (graduate after grade 8)</MudSelectItem>
+                        <MudSelectItem T="SchoolLevel?" Value="@SchoolLevel.HighSchool">High School (graduate after grade 12)</MudSelectItem>
+                    </MudSelect>
+                }
+
+                <MudAlert Severity="Severity.Normal" Dense="true" Class="mt-2">
+                    Applying the rollover will create an automatic backup at
+                    <code>Data/backups/pre-rollover-*.db</code> before making any changes.
+                    That backup is the only undo.
+                </MudAlert>
+            </MudPaper>
+        }
+        else if (Step == 1)
+        {
+            <MudPaper Class="pa-6 mb-4">
+                <MudText Typo="Typo.h5" Class="mb-3">Returning students</MudText>
+                <MudText Typo="Typo.body2" Class="mb-3 mud-text-secondary">
+                    Students at or above graduating grade @_graduatingGrade are unchecked by default.
+                    Paste a list of names (one per line) to check matches.
+                </MudText>
+
+                <MudTextField @bind-Value="_pasteBox"
+                              Label="Paste returning names (optional)"
+                              Variant="Variant.Outlined"
+                              Lines="4"
+                              Class="mb-2" />
+                <MudButton Variant="Variant.Outlined" Size="Size.Small" Class="mb-4" OnClick="ApplyPastedNames"
+                           StartIcon="@Icons.Material.Filled.ContentPaste">
+                    Apply pasted names
+                </MudButton>
+
+                @if (_pasteUnmatched.Count > 0)
+                {
+                    <MudAlert Severity="Severity.Warning" Dense="true" Class="mb-3">
+                        Unmatched: @string.Join("; ", _pasteUnmatched)
+                    </MudAlert>
+                }
+                @if (_pasteAmbiguous.Count > 0)
+                {
+                    <MudAlert Severity="Severity.Warning" Dense="true" Class="mb-3">
+                        Ambiguous (check manually): @string.Join("; ", _pasteAmbiguous)
+                    </MudAlert>
+                }
+
+                <MudTable Items="_students" Dense="true" Hover="true" Striped="true">
+                    <HeaderContent>
+                        <MudTh>Returning</MudTh>
+                        <MudTh>Name</MudTh>
+                        <MudTh>Grade</MudTh>
+                        <MudTh>TSA Year</MudTh>
+                        <MudTh>Officer</MudTh>
+                    </HeaderContent>
+                    <RowTemplate>
+                        <MudTd>
+                            <MudCheckBox T="bool" Value="_returningIds.Contains(context.Id)"
+                                         ValueChanged="(bool v) => SetReturning(context.Id, v)"
+                                         Dense="true" Color="Color.Primary" />
+                        </MudTd>
+                        <MudTd>@context.LastNameFirstName</MudTd>
+                        <MudTd>@context.Grade</MudTd>
+                        <MudTd>@context.TsaYear</MudTd>
+                        <MudTd>@(context.OfficerRole?.ToString() ?? "—")</MudTd>
+                    </RowTemplate>
+                </MudTable>
+                <MudText Typo="Typo.caption" Class="mt-2">
+                    @_returningIds.Count returning · @(_students.Count - _returningIds.Count) will be removed
+                </MudText>
+            </MudPaper>
+        }
+        else if (Step == 2)
+        {
+            <MudPaper Class="pa-6 mb-4">
+                <MudText Typo="Typo.h5" Class="mb-3">New officer slate</MudText>
+                <MudText Typo="Typo.body2" Class="mb-4 mud-text-secondary">
+                    Leave a role blank to leave that office vacant. Only returning students are listed.
+                    New students who will be officers can be assigned later on the student edit page.
+                </MudText>
+                <MudGrid>
+                    @foreach (var role in _officerRoles)
+                    {
+                        <MudItem xs="12" md="6">
+                            <MudSelect T="int?" Value="GetOfficerSelection(role)"
+                                       ValueChanged="(int? id) => SetOfficerSelection(role, id)"
+                                       Label="@role.ToString()"
+                                       Variant="Variant.Outlined"
+                                       Clearable="true">
+                                @foreach (var student in ReturningStudents)
+                                {
+                                    <MudSelectItem T="int?" Value="@student.Id">@student.LastNameFirstName</MudSelectItem>
+                                }
+                            </MudSelect>
+                        </MudItem>
+                    }
+                </MudGrid>
+            </MudPaper>
+        }
+        else if (Step == 3)
+        {
+            <MudPaper Class="pa-6 mb-4">
+                <MudText Typo="Typo.h5" Class="mb-3">Season reset</MudText>
+                <MudAlert Severity="Severity.Warning" Dense="true" Class="mb-3">
+                    The following are always cleared: all teams, all event rankings, and all meeting history records.
+                    Written notes on the Notes page are not affected.
+                </MudAlert>
+                <MudCheckBox @bind-Value="_clearEventOccurrences" Color="Color.Primary" Label="Clear all event occurrences (state schedule)" />
+                <MudText Typo="Typo.caption" Class="mud-text-secondary">
+                    Leave this checked unless you plan to keep last year's calendar rows. Import the new schedule afterward.
+                </MudText>
+            </MudPaper>
+        }
+        else if (Step == 4)
+        {
+            var plan = BuildPlan();
+            <MudPaper Class="pa-6 mb-4">
+                <MudText Typo="Typo.h5" Class="mb-3">Preview</MudText>
+                <MudText>Competition year → <strong>@plan.TargetCompetitionYear</strong></MudText>
+                <MudText>Promote <strong>@plan.ReturningCount</strong> students · Remove <strong>@plan.RemovalCount</strong> students</MudText>
+                <MudText>Clear teams, rankings, meeting history@( _clearEventOccurrences ? ", and event occurrences" : "" )</MudText>
+
+                @if (plan.Warnings.Count > 0)
+                {
+                    <MudAlert Severity="Severity.Warning" Class="mt-3 mb-2">
+                        <MudText Typo="Typo.subtitle2">Warnings</MudText>
+                        <ul class="mb-0">
+                            @foreach (var warning in plan.Warnings)
+                            {
+                                <li>@warning</li>
+                            }
+                        </ul>
+                    </MudAlert>
+                }
+
+                <MudExpansionPanels Class="mt-3 mb-3">
+                    <MudExpansionPanel Text="@($"Promotions ({plan.ReturningCount})")">
+                        <MudTable Items="plan.Promotions" Dense="true" Hover="true">
+                            <HeaderContent>
+                                <MudTh>Name</MudTh>
+                                <MudTh>Grade</MudTh>
+                                <MudTh>TSA Year</MudTh>
+                                <MudTh>Officer</MudTh>
+                            </HeaderContent>
+                            <RowTemplate>
+                                <MudTd>@context.Student.LastNameFirstName</MudTd>
+                                <MudTd>@context.PreviousGrade → @context.NewGrade</MudTd>
+                                <MudTd>@context.PreviousTsaYear → @context.NewTsaYear</MudTd>
+                                <MudTd>@(context.PreviousOfficerRole?.ToString() ?? "—") → @(context.NewOfficerRole?.ToString() ?? "—")</MudTd>
+                            </RowTemplate>
+                        </MudTable>
+                    </MudExpansionPanel>
+                    <MudExpansionPanel Text="@($"Removals ({plan.RemovalCount})")">
+                        <MudList T="string" Dense="true">
+                            @foreach (var student in plan.StudentsToRemove)
+                            {
+                                <MudListItem T="string">@student.LastNameFirstName (grade @student.Grade)</MudListItem>
+                            }
+                        </MudList>
+                    </MudExpansionPanel>
+                    <MudExpansionPanel Text="Officers">
+                        <MudList T="string" Dense="true">
+                            @foreach (var change in plan.OfficerChanges)
+                            {
+                                <MudListItem T="string">
+                                    @change.Role:
+                                    @(change.NewOfficer?.LastNameFirstName ?? "(vacant)")
+                                    @if (change.PreviousOfficer != null)
+                                    {
+                                        <span class="mud-text-secondary"> (was @change.PreviousOfficer.LastNameFirstName)</span>
+                                    }
+                                </MudListItem>
+                            }
+                        </MudList>
+                    </MudExpansionPanel>
+                </MudExpansionPanels>
+
+                <MudTextField @bind-Value="_applyConfirmYear"
+                              Label="@($"Type {_targetYear.Trim()} to enable Apply")"
+                              Variant="Variant.Outlined"
+                              HelperText="Must exactly match the target competition year above"
+                              Class="mb-4"
+                              Style="max-width: 280px;"
+                              Immediate="true" />
+
+                <MudButton Variant="Variant.Filled"
+                           Color="Color.Error"
+                           StartIcon="@Icons.Material.Filled.Warning"
+                           Disabled="_isApplying || !CanApply"
+                           OnClick="ConfirmAndApply">
+                    @if (_isApplying)
+                    {
+                        <MudProgressCircular Class="mr-2" Size="Size.Small" Indeterminate="true" />
+                        <span>Applying...</span>
+                    }
+                    else
+                    {
+                        <span>Apply rollover</span>
+                    }
+                </MudButton>
+            </MudPaper>
+        }
+
+        <MudStack Row="true" Justify="Justify.SpaceBetween" Class="mt-2">
+            <MudButton Variant="Variant.Text"
+                       Disabled="Step == 0 || _isApplying"
+                       OnClick="() => Step--">
+                Back
+            </MudButton>
+            @if (Step < 4)
+            {
+                <MudButton Variant="Variant.Filled"
+                           Color="Color.Primary"
+                           Disabled="!CanGoNext"
+                           OnClick="GoNext">
+                    Next
+                </MudButton>
+            }
+        </MudStack>
+    }
+</MudContainer>
+
+@code {
+    private const string UnlockPhrase = "ROLLOVER";
+
+    private CancellationTokenSource? _cancellationTokenSource;
+    private bool _isDisposed;
+    private bool _wizardUnlocked;
+    private bool _ackDestructive;
+    private bool _ackBackupOnlyUndo;
+    private string _unlockPhrase = "";
+    private string _applyConfirmYear = "";
+    private int _step;
+    private int Step
+    {
+        get => _step;
+        set
+        {
+            _step = value;
+            if (_step >= 1)
+                EnsureReturningDefaults();
+            if (_step >= 2)
+                PruneOfficerSelections();
+        }
+    }
+    private List<Student>? _students;
+    private HashSet<int> _returningIds = [];
+    private Dictionary<OfficerRole, int?> _officerSelections = [];
+    private readonly OfficerRole[] _officerRoles = Enum.GetValues<OfficerRole>();
+
+    private string _targetYear = "2027";
+    private SchoolLevel? _configuredSchoolLevel;
+    private SchoolLevel? _overrideSchoolLevel;
+    private int? _graduatingGrade;
+    private string _pasteBox = "";
+    private List<string> _pasteUnmatched = [];
+    private List<string> _pasteAmbiguous = [];
+    private bool _clearEventOccurrences = true;
+    private bool _isApplying;
+    private YearRolloverResult? _result;
+    private bool _returningInitialized;
+
+    private IEnumerable<Student> ReturningStudents =>
+        _students?.Where(s => _returningIds.Contains(s.Id)).OrderBy(s => s.LastName).ThenBy(s => s.FirstName)
+        ?? Enumerable.Empty<Student>();
+
+    private bool CanUnlockWizard =>
+        _ackDestructive &&
+        _ackBackupOnlyUndo &&
+        string.Equals(_unlockPhrase.Trim(), UnlockPhrase, StringComparison.OrdinalIgnoreCase);
+
+    private bool CanApply =>
+        _wizardUnlocked &&
+        _graduatingGrade.HasValue &&
+        !string.IsNullOrWhiteSpace(_targetYear) &&
+        string.Equals(_applyConfirmYear.Trim(), _targetYear.Trim(), StringComparison.Ordinal);
+
+    private bool CanGoNext => Step switch
+    {
+        0 => _graduatingGrade.HasValue && !string.IsNullOrWhiteSpace(_targetYear),
+        _ => true
+    };
+
+    protected override void OnInitialized()
+    {
+        _cancellationTokenSource = new CancellationTokenSource();
+
+        var currentYear = Configuration["ChapterSettings:CompetitionYear"] ?? "2026";
+        if (int.TryParse(currentYear, out var year))
+            _targetYear = (year + 1).ToString();
+        else
+            _targetYear = currentYear;
+
+        _configuredSchoolLevel = Configuration.GetSection("ChapterSettings").Get<WebApp.Models.ChapterSettings>()?.SchoolLevel
+            ?? ParseSchoolLevel(Configuration["ChapterSettings:SchoolLevel"]);
+        _graduatingGrade = GraduatingGradeResolver.FromSchoolLevel(_configuredSchoolLevel);
+    }
+
+    protected override async Task OnInitializedAsync()
+    {
+        try
+        {
+            var token = _cancellationTokenSource?.Token ?? CancellationToken.None;
+            _students = await Context.Students
+                .AsNoTracking()
+                .OrderBy(s => s.LastName)
+                .ThenBy(s => s.FirstName)
+                .ToListAsync(token);
+
+            foreach (var role in _officerRoles)
+                _officerSelections[role] = null;
+        }
+        catch (TaskCanceledException)
+        {
+            // disposed
+        }
+        catch (Exception ex)
+        {
+            Logger.LogError(ex, "Failed to load students for year rollover");
+            if (!_isDisposed)
+                Snackbar.Add($"Failed to load students: {ex.Message}", Severity.Error);
+        }
+    }
+
+    private static SchoolLevel? ParseSchoolLevel(string? value)
+    {
+        if (string.IsNullOrWhiteSpace(value))
+            return null;
+        return Enum.TryParse<SchoolLevel>(value, ignoreCase: true, out var parsed) ? parsed : null;
+    }
+
+    private void UnlockWizard()
+    {
+        if (!CanUnlockWizard)
+            return;
+
+        _wizardUnlocked = true;
+        Step = 0;
+        Snackbar.Add("Year rollover wizard unlocked for this session", Severity.Warning);
+    }
+
+    private void LockWizard()
+    {
+        _wizardUnlocked = false;
+        _ackDestructive = false;
+        _ackBackupOnlyUndo = false;
+        _unlockPhrase = "";
+        _applyConfirmYear = "";
+        Step = 0;
+    }
+
+    private void OnOverrideSchoolLevelChanged(SchoolLevel? value)
+    {
+        _overrideSchoolLevel = value;
+        _graduatingGrade = GraduatingGradeResolver.FromSchoolLevel(value);
+        _returningInitialized = false;
+    }
+
+    private void EnsureReturningDefaults()
+    {
+        if (_returningInitialized || _students == null || !_graduatingGrade.HasValue)
+            return;
+
+        _returningIds = _students
+            .Where(s => YearTransitionPlanner.SuggestReturning(s, _graduatingGrade.Value))
+            .Select(s => s.Id)
+            .ToHashSet();
+        _returningInitialized = true;
+    }
+
+    private void GoNext()
+    {
+        Step++;
+    }
+
+    private void SetReturning(int studentId, bool returning)
+    {
+        if (returning)
+            _returningIds.Add(studentId);
+        else
+        {
+            _returningIds.Remove(studentId);
+            PruneOfficerSelections();
+        }
+    }
+
+    private void ApplyPastedNames()
+    {
+        if (_students == null)
+            return;
+
+        var lines = _pasteBox.Split(['\r', '\n'], StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+        var result = YearTransitionPlanner.MatchPastedNames(_students, lines);
+        foreach (var id in result.MatchedStudentIds)
+            _returningIds.Add(id);
+        _pasteUnmatched = result.UnmatchedNames.ToList();
+        _pasteAmbiguous = result.AmbiguousNames.ToList();
+    }
+
+    private int? GetOfficerSelection(OfficerRole role) =>
+        _officerSelections.TryGetValue(role, out var id) ? id : null;
+
+    private void SetOfficerSelection(OfficerRole role, int? studentId)
+    {
+        _officerSelections[role] = studentId;
+    }
+
+    private void PruneOfficerSelections()
+    {
+        foreach (var role in _officerRoles)
+        {
+            if (_officerSelections.TryGetValue(role, out var id) &&
+                id.HasValue &&
+                !_returningIds.Contains(id.Value))
+            {
+                _officerSelections[role] = null;
+            }
+        }
+    }
+
+    private YearTransitionPlan BuildPlan()
+    {
+        return YearTransitionPlanner.Build(new YearTransitionRequest
+        {
+            Students = _students ?? [],
+            ReturningStudentIds = _returningIds,
+            OfficerAssignments = _officerSelections,
+            GraduatingGrade = _graduatingGrade ?? 8,
+            TargetCompetitionYear = _targetYear.Trim(),
+            PastedNames = []
+        });
+    }
+
+    private async Task ConfirmAndApply()
+    {
+        if (_isDisposed || !CanApply || !_wizardUnlocked)
+            return;
+
+        if (!string.Equals(_applyConfirmYear.Trim(), _targetYear.Trim(), StringComparison.Ordinal))
+        {
+            Snackbar.Add("Type the target competition year exactly to confirm.", Severity.Warning);
+            return;
+        }
+
+        var plan = BuildPlan();
+        var message =
+            $"This will permanently delete {plan.RemovalCount} student(s), all teams, all event rankings, " +
+            $"all meeting history{(_clearEventOccurrences ? ", and all event occurrences" : "")}. " +
+            $"An automatic database backup will be created first and is the only undo. Continue?";
+
+        var confirmed = await DialogService.ShowMessageBox(
+            "Confirm year rollover",
+            message,
+            yesText: "Yes, apply rollover",
+            cancelText: "Cancel");
+
+        if (confirmed != true || _isDisposed || !_wizardUnlocked)
+            return;
+
+        _isApplying = true;
+        try
+        {
+            var token = _cancellationTokenSource?.Token ?? CancellationToken.None;
+            _result = await YearRolloverService.ApplyAsync(new YearRolloverOptions
+            {
+                Plan = plan,
+                ClearEventOccurrences = _clearEventOccurrences
+            }, token);
+
+            if (!_isDisposed)
+                Snackbar.Add($"Rollover to {_result.CompetitionYear} complete", Severity.Success);
+        }
+        catch (TaskCanceledException)
+        {
+            // disposed
+        }
+        catch (JSDisconnectedException)
+        {
+            // connection lost
+        }
+        catch (Exception ex)
+        {
+            Logger.LogError(ex, "Year rollover apply failed");
+            if (!_isDisposed)
+                Snackbar.Add($"Rollover failed: {ex.Message}", Severity.Error);
+        }
+        finally
+        {
+            _isApplying = false;
+        }
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        if (!_isDisposed)
+        {
+            _isDisposed = true;
+            _cancellationTokenSource?.Cancel();
+            _cancellationTokenSource?.Dispose();
+            _cancellationTokenSource = null;
+        }
+        await ValueTask.CompletedTask;
+    }
+}
diff --git a/WebApp/Components/Shared/Layout/NavMenu.razor b/WebApp/Components/Shared/Layout/NavMenu.razor
index 809f890..b7474be 100644
--- a/WebApp/Components/Shared/Layout/NavMenu.razor
+++ b/WebApp/Components/Shared/Layout/NavMenu.razor
@@ -35,6 +35,7 @@
         <AuthorizeView Roles="Administrator">
             <MudDivider Class="my-2"/>
             <MudNavLink Href="/settings/chapter" Icon="@Icons.Material.Filled.School">Chapter Settings</MudNavLink>
+            <MudNavLink Href="/settings/new-year" Icon="@Icons.Material.Filled.EventRepeat">New Year Rollover (locked)</MudNavLink>
             <MudNavLink Href="/settings/validation" Icon="@Icons.Material.Filled.Tune">Validation Settings</MudNavLink>
         </AuthorizeView>
     </MudNavMenu>
diff --git a/WebApp/Program.cs b/WebApp/Program.cs
index c9626f4..531770b 100644
--- a/WebApp/Program.cs
+++ b/WebApp/Program.cs
@@ -201,6 +201,9 @@ builder.Services.AddScoped<WebApp.Services.MarkdownTablePasteService>();
 builder.Services.AddScoped<WebApp.Services.IMeetingScheduleStateService, WebApp.Services.MeetingScheduleStateService>();
 builder.Services.AddScoped<WebApp.Services.IMeetingScheduleClipboardService, WebApp.Services.MeetingScheduleClipboardService>();
 builder.Services.AddScoped<WebApp.Services.IMeetingScheduleDataService, WebApp.Services.MeetingScheduleDataService>();
+builder.Services.AddScoped<WebApp.Services.IChapterSettingsWriter, WebApp.Services.ChapterSettingsWriter>();
+builder.Services.AddScoped<WebApp.Services.IDatabaseBackupService, WebApp.Services.DatabaseBackupService>();
+builder.Services.AddScoped<WebApp.Services.IYearRolloverService, WebApp.Services.YearRolloverService>();
 
 builder.Services.Configure<StateScheduleHandoutOptions>(
     builder.Configuration.GetSection(StateScheduleHandoutOptions.SectionName));
diff --git a/WebApp/Services/ChapterSettingsWriter.cs b/WebApp/Services/ChapterSettingsWriter.cs
new file mode 100644
index 0000000..1781e5c
--- /dev/null
+++ b/WebApp/Services/ChapterSettingsWriter.cs
@@ -0,0 +1,67 @@
+using System.Text.Json;
+using WebApp.Models;
+
+namespace WebApp.Services;
+
+/// <summary>
+/// Persists chapter settings to <c>Data/appsettings.json</c>.
+/// </summary>
+public class ChapterSettingsWriter : IChapterSettingsWriter
+{
+    private readonly IWebHostEnvironment _environment;
+    private readonly IConfiguration _configuration;
+    private readonly ILogger<ChapterSettingsWriter> _logger;
+
+    public ChapterSettingsWriter(
+        IWebHostEnvironment environment,
+        IConfiguration configuration,
+        ILogger<ChapterSettingsWriter> logger)
+    {
+        _environment = environment;
+        _configuration = configuration;
+        _logger = logger;
+    }
+
+    public async Task WriteAsync(ChapterSettings settings, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(settings);
+
+        var appSettingsPath = GetAppSettingsPath();
+        var dataDir = Path.GetDirectoryName(appSettingsPath);
+        if (dataDir != null && !Directory.Exists(dataDir))
+        {
+            Directory.CreateDirectory(dataDir);
+        }
+
+        Dictionary<string, object?> root;
+        if (File.Exists(appSettingsPath))
+        {
+            var existingJson = await File.ReadAllTextAsync(appSettingsPath, cancellationToken);
+            root = JsonSerializer.Deserialize<Dictionary<string, object?>>(existingJson)
+                   ?? [];
+        }
+        else
+        {
+            root = [];
+        }
+
+        root["ChapterSettings"] = settings;
+
+        var options = new JsonSerializerOptions { WriteIndented = true };
+        var json = JsonSerializer.Serialize(root, options);
+        await File.WriteAllTextAsync(appSettingsPath, json, cancellationToken);
+
+        _logger.LogInformation("Chapter settings written to {Path}", appSettingsPath);
+    }
+
+    public async Task UpdateCompetitionYearAsync(string competitionYear, CancellationToken cancellationToken = default)
+    {
+        var settings = _configuration.GetSection("ChapterSettings").Get<ChapterSettings>()
+                       ?? new ChapterSettings();
+        settings.CompetitionYear = competitionYear;
+        await WriteAsync(settings, cancellationToken);
+    }
+
+    private string GetAppSettingsPath() =>
+        Path.Combine(_environment.ContentRootPath, "Data", "appsettings.json");
+}
diff --git a/WebApp/Services/DatabaseBackupService.cs b/WebApp/Services/DatabaseBackupService.cs
new file mode 100644
index 0000000..d8df90f
--- /dev/null
+++ b/WebApp/Services/DatabaseBackupService.cs
@@ -0,0 +1,48 @@
+using Data;
+using Microsoft.EntityFrameworkCore;
+
+namespace WebApp.Services;
+
+/// <summary>
+/// Creates SQLite database backups via VACUUM INTO.
+/// </summary>
+public class DatabaseBackupService : IDatabaseBackupService
+{
+    private readonly AppDbContext _context;
+    private readonly IWebHostEnvironment _environment;
+    private readonly ILogger<DatabaseBackupService> _logger;
+
+    public DatabaseBackupService(
+        AppDbContext context,
+        IWebHostEnvironment environment,
+        ILogger<DatabaseBackupService> logger)
+    {
+        _context = context;
+        _environment = environment;
+        _logger = logger;
+    }
+
+    public async Task<string> CreatePreRolloverBackupAsync(CancellationToken cancellationToken = default)
+    {
+        var backupsDir = Path.Combine(_environment.ContentRootPath, "Data", "backups");
+        Directory.CreateDirectory(backupsDir);
+
+        var fileName = $"pre-rollover-{DateTime.Now:yyyyMMdd-HHmmss}.db";
+        var backupPath = Path.Combine(backupsDir, fileName);
+
+        // Path is server-generated (never user input); escape single quotes for SQLite string literal.
+        var escapedPath = backupPath.Replace("'", "''", StringComparison.Ordinal);
+#pragma warning disable EF1002 // Path is fully server-controlled; VACUUM INTO cannot use parameters.
+        await _context.Database.ExecuteSqlRawAsync($"VACUUM INTO '{escapedPath}'", cancellationToken);
+#pragma warning restore EF1002
+
+        if (!File.Exists(backupPath))
+        {
+            throw new InvalidOperationException(
+                $"Database backup was requested but the file was not created at '{backupPath}'.");
+        }
+
+        _logger.LogInformation("Created pre-rollover database backup at {BackupPath}", backupPath);
+        return backupPath;
+    }
+}
diff --git a/WebApp/Services/IChapterSettingsWriter.cs b/WebApp/Services/IChapterSettingsWriter.cs
new file mode 100644
index 0000000..dd10c70
--- /dev/null
+++ b/WebApp/Services/IChapterSettingsWriter.cs
@@ -0,0 +1,19 @@
+using WebApp.Models;
+
+namespace WebApp.Services;
+
+/// <summary>
+/// Persists chapter settings to <c>Data/appsettings.json</c>.
+/// </summary>
+public interface IChapterSettingsWriter
+{
+    /// <summary>
+    /// Writes the given chapter settings, preserving other top-level sections in the file.
+    /// </summary>
+    Task WriteAsync(ChapterSettings settings, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Updates only the competition year while preserving other chapter settings from configuration.
+    /// </summary>
+    Task UpdateCompetitionYearAsync(string competitionYear, CancellationToken cancellationToken = default);
+}
diff --git a/WebApp/Services/IDatabaseBackupService.cs b/WebApp/Services/IDatabaseBackupService.cs
new file mode 100644
index 0000000..1c6dcd9
--- /dev/null
+++ b/WebApp/Services/IDatabaseBackupService.cs
@@ -0,0 +1,13 @@
+namespace WebApp.Services;
+
+/// <summary>
+/// Creates SQLite database backups.
+/// </summary>
+public interface IDatabaseBackupService
+{
+    /// <summary>
+    /// Creates a pre-rollover backup of the application database using SQLite VACUUM INTO.
+    /// </summary>
+    /// <returns>The absolute path of the backup file.</returns>
+    Task<string> CreatePreRolloverBackupAsync(CancellationToken cancellationToken = default);
+}
diff --git a/WebApp/Services/IYearRolloverService.cs b/WebApp/Services/IYearRolloverService.cs
new file mode 100644
index 0000000..40a7062
--- /dev/null
+++ b/WebApp/Services/IYearRolloverService.cs
@@ -0,0 +1,36 @@
+using Core.YearTransition;
+
+namespace WebApp.Services;
+
+/// <summary>
+/// Options for applying a year rollover.
+/// </summary>
+public sealed class YearRolloverOptions
+{
+    public required YearTransitionPlan Plan { get; init; }
+    public bool ClearEventOccurrences { get; init; } = true;
+}
+
+/// <summary>
+/// Result of a successful year rollover.
+/// </summary>
+public sealed class YearRolloverResult
+{
+    public required string BackupPath { get; init; }
+    public required int StudentsRemoved { get; init; }
+    public required int StudentsPromoted { get; init; }
+    public required int TeamsDeleted { get; init; }
+    public required int RankingsDeleted { get; init; }
+    public required int MeetingHistoriesDeleted { get; init; }
+    public required int EventOccurrencesDeleted { get; init; }
+    public required string CompetitionYear { get; init; }
+    public required IReadOnlyList<string> OfficerSummary { get; init; }
+}
+
+/// <summary>
+/// Applies a year-transition plan to the database.
+/// </summary>
+public interface IYearRolloverService
+{
+    Task<YearRolloverResult> ApplyAsync(YearRolloverOptions options, CancellationToken cancellationToken = default);
+}
diff --git a/WebApp/Services/YearRolloverService.cs b/WebApp/Services/YearRolloverService.cs
new file mode 100644
index 0000000..9f3a137
--- /dev/null
+++ b/WebApp/Services/YearRolloverService.cs
@@ -0,0 +1,182 @@
+using Core.YearTransition;
+using Data;
+using Microsoft.EntityFrameworkCore;
+
+namespace WebApp.Services;
+
+/// <summary>
+/// Applies a year-transition plan: backup, wipe season data, promote/remove students, update year.
+/// </summary>
+public class YearRolloverService : IYearRolloverService
+{
+    private readonly AppDbContext _context;
+    private readonly IDatabaseBackupService _backupService;
+    private readonly IChapterSettingsWriter _chapterSettingsWriter;
+    private readonly ILogger<YearRolloverService> _logger;
+
+    public YearRolloverService(
+        AppDbContext context,
+        IDatabaseBackupService backupService,
+        IChapterSettingsWriter chapterSettingsWriter,
+        ILogger<YearRolloverService> logger)
+    {
+        _context = context;
+        _backupService = backupService;
+        _chapterSettingsWriter = chapterSettingsWriter;
+        _logger = logger;
+    }
+
+    public async Task<YearRolloverResult> ApplyAsync(
+        YearRolloverOptions options,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+        ArgumentNullException.ThrowIfNull(options.Plan);
+
+        var plan = options.Plan;
+        var returningIds = plan.Promotions.Select(p => p.Student.Id).ToHashSet();
+        var removalIds = plan.StudentsToRemove.Select(s => s.Id).ToHashSet();
+
+        _logger.LogInformation(
+            "Starting year rollover to {Year}: {Returning} returning, {Removing} removing, clearOccurrences={ClearOccurrences}",
+            plan.TargetCompetitionYear,
+            plan.ReturningCount,
+            plan.RemovalCount,
+            options.ClearEventOccurrences);
+
+        // VACUUM INTO cannot run inside a transaction — backup first and abort if it fails.
+        var backupPath = await _backupService.CreatePreRolloverBackupAsync(cancellationToken);
+
+        int meetingHistoriesDeleted;
+        int teamsDeleted;
+        int rankingsDeleted;
+        int eventOccurrencesDeleted;
+        int studentsRemoved;
+        int studentsPromoted;
+        List<string> officerSummary;
+
+        await using (var transaction = await _context.Database.BeginTransactionAsync(cancellationToken))
+        {
+            try
+            {
+                // Delete season data with ExecuteDelete / SQL so we never leave tracked Team
+                // entities in the change tracker (Include+Remove then ExecuteDelete caused
+                // optimistic concurrency failures when later deleting captain students).
+                meetingHistoriesDeleted = await _context.TeamMeetingHistories.CountAsync(cancellationToken);
+                await _context.Database.ExecuteSqlRawAsync(
+                    """DELETE FROM "TeamMeetingHistoryTeams" """, cancellationToken);
+                await _context.Database.ExecuteSqlRawAsync(
+                    """DELETE FROM "TeamMeetingHistoryStudents" """, cancellationToken);
+                await _context.TeamMeetingHistories.ExecuteDeleteAsync(cancellationToken);
+
+                teamsDeleted = await _context.Teams.ExecuteDeleteAsync(cancellationToken);
+                rankingsDeleted = await _context.StudentEventRanking.ExecuteDeleteAsync(cancellationToken);
+
+                eventOccurrencesDeleted = 0;
+                if (options.ClearEventOccurrences)
+                {
+                    eventOccurrencesDeleted = await _context.EventOccurrences.ExecuteDeleteAsync(cancellationToken);
+                }
+
+                // Drop any stale tracked entities from earlier queries in this request scope.
+                _context.ChangeTracker.Clear();
+
+                var students = await _context.Students.ToListAsync(cancellationToken);
+                var toRemove = students.Where(s => removalIds.Contains(s.Id)).ToList();
+                var toPromote = students.Where(s => returningIds.Contains(s.Id)).ToList();
+
+                if (toRemove.Count != removalIds.Count)
+                {
+                    throw new InvalidOperationException(
+                        "Some students marked for removal were not found in the database. Aborting rollover.");
+                }
+
+                if (toPromote.Count != returningIds.Count)
+                {
+                    throw new InvalidOperationException(
+                        "Some returning students were not found in the database. Aborting rollover.");
+                }
+
+                // Extra students added while the wizard was open — refuse rather than leave them unprocessed.
+                var plannedIds = returningIds.Union(removalIds).ToHashSet();
+                var unexpected = students.Where(s => !plannedIds.Contains(s.Id)).ToList();
+                if (unexpected.Count > 0)
+                {
+                    var names = string.Join(", ", unexpected.Select(s => s.LastNameFirstName));
+                    throw new InvalidOperationException(
+                        $"Roster changed since the wizard loaded ({unexpected.Count} unexpected student(s): {names}). Reload the page and try again.");
+                }
+
+                _context.Students.RemoveRange(toRemove);
+
+                var promotionById = plan.Promotions.ToDictionary(p => p.Student.Id);
+                foreach (var student in toPromote)
+                {
+                    var promotion = promotionById[student.Id];
+                    student.Grade = promotion.NewGrade;
+                    student.TsaYear = promotion.NewTsaYear;
+                    student.OfficerRole = promotion.NewOfficerRole;
+                }
+
+                await _context.SaveChangesAsync(cancellationToken);
+                await transaction.CommitAsync(cancellationToken);
+
+                studentsRemoved = toRemove.Count;
+                studentsPromoted = toPromote.Count;
+                officerSummary = plan.OfficerChanges
+                    .Select(c => c.NewOfficer == null
+                        ? $"{c.Role}: (vacant)"
+                        : $"{c.Role}: {c.NewOfficer.LastNameFirstName}")
+                    .ToList();
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Year rollover failed after backup at {BackupPath}; rolling back database changes", backupPath);
+                await transaction.RollbackAsync(cancellationToken);
+                throw;
+            }
+        }
+
+        try
+        {
+            await _chapterSettingsWriter.UpdateCompetitionYearAsync(
+                plan.TargetCompetitionYear,
+                cancellationToken);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex,
+                "Year rollover DB changes committed but CompetitionYear file update failed. Backup={BackupPath}",
+                backupPath);
+            throw new InvalidOperationException(
+                $"Database rollover succeeded (backup at '{backupPath}'), but updating CompetitionYear failed: {ex.Message}. Set the year in Chapter Settings, then restart.",
+                ex);
+        }
+
+        var result = new YearRolloverResult
+        {
+            BackupPath = backupPath,
+            StudentsRemoved = studentsRemoved,
+            StudentsPromoted = studentsPromoted,
+            TeamsDeleted = teamsDeleted,
+            RankingsDeleted = rankingsDeleted,
+            MeetingHistoriesDeleted = meetingHistoriesDeleted,
+            EventOccurrencesDeleted = eventOccurrencesDeleted,
+            CompetitionYear = plan.TargetCompetitionYear,
+            OfficerSummary = officerSummary
+        };
+
+        _logger.LogInformation(
+            "Year rollover complete. Backup={BackupPath}, Removed={Removed}, Promoted={Promoted}, Teams={Teams}, Rankings={Rankings}, Histories={Histories}, Occurrences={Occurrences}, Officers={Officers}",
+            result.BackupPath,
+            result.StudentsRemoved,
+            result.StudentsPromoted,
+            result.TeamsDeleted,
+            result.RankingsDeleted,
+            result.MeetingHistoriesDeleted,
+            result.EventOccurrencesDeleted,
+            string.Join("; ", officerSummary));
+
+        return result;
+    }
+}
diff --git a/docker-compose.example.yml b/docker-compose.example.yml
index 49469c3..34e9355 100644
--- a/docker-compose.example.yml
+++ b/docker-compose.example.yml
@@ -26,8 +26,9 @@ services:
       # Option 1: Volume-mounted secrets file (recommended for easy editing)
       - ./auth-secrets.json:/app/secrets/auth-secrets.json:ro
 
-      # Database persistence
-      - ./data:/app/data
+      # Database persistence — must use capital D (/app/Data). Linux paths are
+      # case-sensitive; ./data:/app/data will NOT persist app.db or rollover backups.
+      - ./data:/app/Data
 
       # HTTPS certificate (if needed)
       # - ./certs:/https:ro
diff --git a/docs/instructions/year-rollover.md b/docs/instructions/year-rollover.md
new file mode 100644
index 0000000..59583eb
--- /dev/null
+++ b/docs/instructions/year-rollover.md
@@ -0,0 +1,67 @@
+# Year Rollover Runbook
+
+**Created:** 2026-08-14  
+**Last updated:** 2026-08-14  
+**Description:** How to roll the chapter into a new competition year using the locked New Year wizard.
+
+## Prerequisites
+
+1. Confirm **School Level** is set correctly on [Chapter Settings](/settings/chapter) (`Middle School` or `High School`). That drives the graduating grade (8 or 12).
+2. Have the list of **returning students** and the **new officer slate** ready.
+3. Plan a short maintenance window: after apply you must **restart the app** so printouts pick up the new competition year.
+4. On Docker, confirm the data volume is `./data:/app/Data` (capital **D**). See `DEPLOYMENT.md` — otherwise the automatic backup may not land on the host.
+
+## Steps
+
+1. Sign in as an **Administrator**.
+2. Open **New Year Rollover** at `/settings/new-year` (Admin nav: “New Year Rollover (locked)”).
+3. **Unlock the wizard** (required every session):
+   - Check both acknowledgment boxes.
+   - Type `ROLLOVER` and click **Unlock wizard**.
+   - Refreshing or using **Lock again** re-locks it.
+4. **Step 1 — Year & grades**
+   - Confirm the target competition year (defaults to current + 1).
+   - Confirm the chapter type / graduating grade shown from Chapter Settings.
+5. **Step 2 — Returning roster**
+   - Uncheck anyone who is not returning (grade at/above graduating is unchecked by default).
+   - Optionally paste a name list (`Last, First` or `First Last`) and click **Apply pasted names**.
+6. **Step 3 — Officers**
+   - Assign each office from returning students, or leave vacant.
+   - Officers who are brand-new students can be set later on the student edit page.
+7. **Step 4 — Season reset**
+   - Teams, event rankings, and meeting history are always cleared.
+   - Leave **Clear all event occurrences** checked unless you have a reason to keep last year's calendar rows.
+8. **Step 5 — Preview & apply**
+   - Review promotions, removals, officers, and warnings.
+   - Type the target competition year exactly to enable **Apply rollover**.
+   - Confirm the destructive dialog. The wizard creates `Data/backups/pre-rollover-yyyyMMdd-HHmmss.db` first; that file is the only undo.
+9. **Restart the application** so the home page and printouts show the new competition year.
+10. **Add new students** via `/students/create` or `/import`.
+    - `/import` is add-only and skips existing first+last name matches, so re-importing a full roster is safe for returners.
+11. **Import the new state schedule** from the calendar import page.
+12. On **Meeting Schedule**, click **Reset** once. That page keeps team/student ids in browser localStorage; after a rollover those ids are stale.
+13. Collect new event rankings and run team assignment as usual.
+
+## What is deleted vs kept
+
+| Cleared | Kept |
+|---------|------|
+| Non-returning students | Returning students (promoted) |
+| All teams | Event definitions (national catalog) |
+| All event rankings | Notes (including meeting notes by title) |
+| All meeting history attendance snapshots | Database backup under `Data/backups/` |
+| Event occurrences (when checked) | |
+
+## Backup location
+
+| Environment | Backup path |
+|-------------|-------------|
+| Local (`dotnet run`) | `WebApp/Data/backups/pre-rollover-*.db` |
+| Docker (with `./data:/app/Data`) | Host: `./data/backups/pre-rollover-*.db` (container: `/app/Data/backups/`) |
+
+## Restore from backup (emergency)
+
+1. Stop the application (or `docker-compose stop`).
+2. Replace `Data/app.db` (local) or `./data/app.db` (Docker host) with a copy of the `pre-rollover-*.db` file from the backups folder.
+3. If needed, restore `CompetitionYear` in `Data/appsettings.json` / `./data/appsettings.json` (or Chapter Settings after restart).
+4. Start the application.