diff --git a/DorkNet.Server.Tests/SchemaBootstrapParityTests.cs b/DorkNet.Server.Tests/SchemaBootstrapParityTests.cs
new file mode 100644
index 0000000..3060da9
--- /dev/null
+++ b/DorkNet.Server.Tests/SchemaBootstrapParityTests.cs
@@ -0,0 +1,271 @@
+using System.Text.RegularExpressions;
+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+using DorkNet.Server.Data;
+
+namespace DorkNet.Server.Tests;
+
+/// <summary>
+/// Guards the two ways a column reaches a database that already exists, because
+/// getting either one wrong is invisible until a live server starts returning
+/// 500s.
+///
+/// Every other test in this suite runs against a FRESH database, where
+/// <c>EnsureCreated</c> builds the whole schema straight from the entity model —
+/// so every column always exists and none of this is exercised. Only an
+/// *existing* database can be missing a column, and that is exactly what took
+/// down club home, matchmake/dorm, the presence heartbeat and the chat inbox at
+/// once: three columns were added to the entity model with an EF migration, but
+/// the Postgres path never replays migrations, so a deployed database never got
+/// them.
+///
+/// The two mechanisms, and the invariant each test asserts:
+///
+/// <list type="number">
+/// <item><b>SQLite</b> applies committed EF migrations via <c>Database.Migrate()</c>.
+/// So the migration history alone must be able to build the current model.</item>
+/// <item><b>Postgres</b> is <c>EnsureCreated</c>-only and NEVER replays
+/// migrations. A database created before a column existed only gets it from an
+/// idempotent <c>Ensure*</c> ALTER in <see cref="DorkNet.Server.Startup"/>'s
+/// DatabaseBootstrap. So anything added after the Initial migration must appear
+/// there too.</item>
+/// </list>
+/// </summary>
+public sealed class SchemaBootstrapParityTests
+{
+    /// <summary>Every table and column in the entity model must be reachable on
+    /// a database that already exists — via a committed migration, an
+    /// idempotent <c>Ensure*</c> patch, or both.
+    ///
+    /// That union is exactly what boot does: SQLite runs <c>Database.Migrate()</c>
+    /// and then the <c>Ensure*</c> helpers, and Postgres runs the helpers alone.
+    /// A property with NEITHER reaches only brand-new databases, and every
+    /// query touching it throws at runtime on a deployed server.
+    ///
+    /// The union is asserted rather than migrations alone because a large amount
+    /// of the schema legitimately predates this rule and lives only in the
+    /// helpers. Tightening that up is a separate cleanup; what must never happen
+    /// is a column covered by nothing.</summary>
+    [Fact]
+    public async Task Every_model_column_reaches_an_existing_database()
+    {
+        await using var connection = new SqliteConnection("DataSource=:memory:");
+        await connection.OpenAsync();
+
+        var options = new DbContextOptionsBuilder<DorkNetDbContext>()
+            .UseSqlite(connection)
+            .Options;
+
+        await using var db = new DorkNetDbContext(options);
+        await db.Database.MigrateAsync();
+
+        var actual = await ReadSqliteSchemaAsync(connection);
+        var (patchedTables, patchedColumns) = ReadBootstrapPatches(postgresOnly: false);
+        var missing = new List<string>();
+
+        foreach (var entity in db.Model.GetEntityTypes())
+        {
+            var table = entity.GetTableName();
+            if (string.IsNullOrEmpty(table)) continue;
+
+            var migrated = actual.TryGetValue(table, out var columns);
+            if (!migrated && !patchedTables.Contains(table))
+            {
+                missing.Add($"{table} (whole table)");
+                continue;
+            }
+            // A table the helpers create carries its own columns in the same
+            // CREATE, so only migrated tables need a per-column check.
+            if (!migrated) continue;
+
+            foreach (var property in entity.GetProperties())
+            {
+                var column = property.GetColumnName();
+                if (string.IsNullOrEmpty(column)) continue;
+                if (columns!.Contains(column)) continue;
+                if (patchedColumns.Contains($"{table}.{column}")) continue;
+                missing.Add($"{table}.{column}");
+            }
+        }
+
+        Assert.True(missing.Count == 0,
+            $"""
+             {missing.Count} model table(s)/column(s) are covered by NOTHING.
+
+             They exist on a freshly-created database (EnsureCreated builds the
+             whole model) but never appear on one that already exists, so a
+             deployed server throws "no such column" / "column does not exist"
+             on every request that touches them.
+
+             Add a migration AND an idempotent ALTER in an Ensure*Async helper in
+             DorkNet.Server/Startup/DatabaseBootstrap.cs for:
+
+             {string.Join(Environment.NewLine, missing.Order(StringComparer.Ordinal))}
+             """);
+    }
+
+    /// <summary>Every column added AFTER the Initial migration must also be
+    /// added by an idempotent Postgres <c>ALTER</c> in DatabaseBootstrap.
+    ///
+    /// Postgres never replays migrations, so a migration alone reaches only
+    /// brand-new databases. A production database created before the column
+    /// existed gets it from the Ensure* helpers or not at all — the exact hole
+    /// that broke matchmake/dorm (PrivateInstances.RoomCode),
+    /// club/home/me (Clubs.ClubChatEnabled) and the chat inbox
+    /// (ChatMessages.ModerationState).</summary>
+    [Fact]
+    public void Post_initial_columns_are_patched_for_existing_postgres_databases()
+    {
+        var migrations = FindRepoDirectory("DorkNet.Server", "Migrations");
+        var (patchedTables, patchedColumns) = ReadBootstrapPatches(postgresOnly: true);
+
+        // Anything AddColumn'd by a migration other than Initial post-dates the
+        // baseline, so an existing Postgres database will not have it.
+        var gaps = new List<string>();
+        foreach (var file in Directory.GetFiles(migrations, "*.cs"))
+        {
+            var name = Path.GetFileNameWithoutExtension(file);
+            if (name.Contains("Designer", StringComparison.Ordinal)) continue;
+            if (name.Contains("Initial", StringComparison.Ordinal)) continue;
+            if (name.Contains("ModelSnapshot", StringComparison.Ordinal)) continue;
+
+            var text = File.ReadAllText(file);
+            foreach (Match m in Regex.Matches(text,
+                         @"AddColumn<[^>]+>\(\s*name:\s*""(?<column>\w+)""\s*,\s*table:\s*""(?<table>\w+)""",
+                         RegexOptions.Singleline))
+            {
+                var table = m.Groups["table"].Value;
+                var column = m.Groups["column"].Value;
+                if (patchedTables.Contains(table)) continue;      // whole table is created by a patch
+                if (patchedColumns.Contains($"{table}.{column}")) continue;
+                gaps.Add($"{table}.{column}  (added by {name})");
+            }
+
+            foreach (Match m in Regex.Matches(text,
+                         @"CreateTable\(\s*name:\s*""(?<table>\w+)""",
+                         RegexOptions.Singleline))
+            {
+                var table = m.Groups["table"].Value;
+                if (!patchedTables.Contains(table))
+                    gaps.Add($"{table} (whole table, created by {name})");
+            }
+        }
+
+        Assert.True(gaps.Count == 0,
+            $"""
+             {gaps.Count} schema change(s) reach new databases only.
+
+             The Postgres path is EnsureCreated-only and never replays
+             migrations, so a migration alone does NOT add these to a database
+             that already exists — a deployed server will throw
+             "column does not exist" on every request that touches them.
+
+             Add an idempotent ALTER/CREATE to an Ensure*Async helper in
+             DorkNet.Server/Startup/DatabaseBootstrap.cs for:
+
+             {string.Join(Environment.NewLine, gaps.Order(StringComparer.Ordinal))}
+             """);
+    }
+
+    /// <summary>Tables and columns the <c>Ensure*</c> helpers add by raw SQL.
+    ///
+    /// The helpers are private, so this reads their statements out of the source
+    /// rather than executing them. In that source the SQL sits inside verbatim
+    /// strings, so a quoted identifier appears as two literal quote characters
+    /// (<c>""Playlists""</c>).
+    ///
+    /// <paramref name="postgresOnly"/> keys off <c>IF NOT EXISTS</c>: the
+    /// Postgres branch uses it, while the SQLite branch omits it and swallows
+    /// the duplicate-column error instead. So requiring it isolates the branch
+    /// that an existing Postgres database actually depends on.</summary>
+    private static (HashSet<string> Tables, HashSet<string> Columns) ReadBootstrapPatches(
+        bool postgresOnly)
+    {
+        var bootstrap = Path.Combine(
+            FindRepoDirectory("DorkNet.Server", "Startup"), "DatabaseBootstrap.cs");
+        Assert.True(File.Exists(bootstrap), $"missing {bootstrap}");
+        var sql = File.ReadAllText(bootstrap);
+
+        // The source mixes both C# string styles, so a quoted identifier shows
+        // up as either two quote characters (verbatim, @"... ""X"" ...") or one
+        // (raw, """... "X" ..."""). Accept either.
+        const string Q = "\"{1,2}";
+        var ifNotExists = postgresOnly ? @"IF\s+NOT\s+EXISTS\s+" : @"(?:IF\s+NOT\s+EXISTS\s+)?";
+
+        var columns = Regex
+            .Matches(sql,
+                $@"ALTER\s+TABLE\s+{Q}(?<table>\w+){Q}\s+ADD\s+COLUMN\s+{ifNotExists}{Q}(?<column>\w+){Q}",
+                RegexOptions.IgnoreCase)
+            .Select(m => $"{m.Groups["table"].Value}.{m.Groups["column"].Value}")
+            .ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var tables = Regex
+            .Matches(sql,
+                $@"CREATE\s+TABLE\s+IF\s+NOT\s+EXISTS\s+{Q}(?<table>\w+){Q}",
+                RegexOptions.IgnoreCase)
+            .Select(m => m.Groups["table"].Value)
+            .ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        // Some helpers loop a column-name array through one interpolated ALTER
+        // (EnsureGameRewardColumnsAsync does). The statement alone only shows
+        // "{col}", so pair each such ALTER with the nearest preceding
+        // `new[] { "A", "B" }` and expand it.
+        foreach (Match alter in Regex.Matches(sql,
+                     $@"ALTER\s+TABLE\s+{Q}(?<table>\w+){Q}\s+ADD\s+COLUMN\s+{ifNotExists}{Q}\{{(?<var>\w+)\}}{Q}",
+                     RegexOptions.IgnoreCase))
+        {
+            var loop = Regex.Matches(
+                    sql[..alter.Index],
+                    $@"foreach\s*\(\s*var\s+{Regex.Escape(alter.Groups["var"].Value)}\s+in\s+new\[\]\s*\{{(?<items>[^}}]*)\}}")
+                .Cast<Match>()
+                .LastOrDefault();
+            if (loop is null) continue;
+
+            foreach (Match item in Regex.Matches(loop.Groups["items"].Value, "\"(?<name>\\w+)\""))
+                columns.Add($"{alter.Groups["table"].Value}.{item.Groups["name"].Value}");
+        }
+
+        return (tables, columns);
+    }
+
+    private static async Task<Dictionary<string, HashSet<string>>> ReadSqliteSchemaAsync(
+        SqliteConnection connection)
+    {
+        var schema = new Dictionary<string, HashSet<string>>(StringComparer.OrdinalIgnoreCase);
+
+        var tables = new List<string>();
+        await using (var cmd = connection.CreateCommand())
+        {
+            cmd.CommandText =
+                "SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%';";
+            await using var reader = await cmd.ExecuteReaderAsync();
+            while (await reader.ReadAsync()) tables.Add(reader.GetString(0));
+        }
+
+        foreach (var table in tables)
+        {
+            var columns = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+            await using var cmd = connection.CreateCommand();
+            cmd.CommandText = $"PRAGMA table_info(\"{table}\");";
+            await using var reader = await cmd.ExecuteReaderAsync();
+            while (await reader.ReadAsync()) columns.Add(reader.GetString(1));
+            schema[table] = columns;
+        }
+
+        return schema;
+    }
+
+    /// <summary>Walk up from the test binaries to the repo root, then into the
+    /// requested source directory.</summary>
+    private static string FindRepoDirectory(params string[] segments)
+    {
+        var dir = new DirectoryInfo(AppContext.BaseDirectory);
+        while (dir is not null && !File.Exists(Path.Combine(dir.FullName, "DorkNet.sln")))
+            dir = dir.Parent;
+
+        Assert.NotNull(dir);
+        var path = Path.Combine(new[] { dir!.FullName }.Concat(segments).ToArray());
+        Assert.True(Directory.Exists(path), $"missing source directory {path}");
+        return path;
+    }
+}
diff --git a/DorkNet.Server/Migrations/20260727200252_Client2023WireFixes.cs b/DorkNet.Server/Migrations/20260727200252_Client2023WireFixes.cs
index 69c7597..e2ffc18 100644
--- a/DorkNet.Server/Migrations/20260727200252_Client2023WireFixes.cs
+++ b/DorkNet.Server/Migrations/20260727200252_Client2023WireFixes.cs
@@ -51,7 +51,7 @@ namespace DorkNet.Server.Migrations
                 table: "Playlists",
                 type: "INTEGER",
                 nullable: false,
-                defaultValue: false);
+                defaultValue: true);
 
             migrationBuilder.AddColumn<bool>(
                 name: "SupportsLevelVoting",
@@ -65,21 +65,21 @@ namespace DorkNet.Server.Migrations
                 table: "Playlists",
                 type: "INTEGER",
                 nullable: false,
-                defaultValue: false);
+                defaultValue: true);
 
             migrationBuilder.AddColumn<bool>(
                 name: "SupportsTeleportVR",
                 table: "Playlists",
                 type: "INTEGER",
                 nullable: false,
-                defaultValue: false);
+                defaultValue: true);
 
             migrationBuilder.AddColumn<bool>(
                 name: "SupportsWalkVR",
                 table: "Playlists",
                 type: "INTEGER",
                 nullable: false,
-                defaultValue: false);
+                defaultValue: true);
 
             migrationBuilder.AddColumn<int>(
                 name: "WarningMask",