diff --git a/app/Enums/BuildGroupType.php b/app/Enums/BuildGroupType.php
new file mode 100644
index 0000000000..82547b532f
--- /dev/null
+++ b/app/Enums/BuildGroupType.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Enums;
+
+enum BuildGroupType: string
+{
+    case DAILY = 'Daily';
+    case LATEST = 'Latest';
+}
diff --git a/app/Models/BuildGroup.php b/app/Models/BuildGroup.php
index 83021e3d69..de0b312d32 100644
--- a/app/Models/BuildGroup.php
+++ b/app/Models/BuildGroup.php
@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use App\Enums\BuildGroupType;
 use Database\Factories\BuildGroupFactory;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -22,7 +23,7 @@
  * @property int $summaryemail
  * @property int $includesubprojectotal // Should this be a boolean?
  * @property int $emailcommitters // Should this be a boolean?
- * @property string $type
+ * @property BuildGroupType $type
  *
  * @mixin Builder<BuildGroup>
  */
@@ -57,6 +58,7 @@ class BuildGroup extends Model
         'summaryemail' => 'integer',
         'includesubprojectotal' => 'integer',
         'emailcommitters' => 'integer',
+        'type' => BuildGroupType::class,
     ];
 
     /**
diff --git a/app/cdash/app/Model/BuildGroup.php b/app/cdash/app/Model/BuildGroup.php
index f31cf05882..a2b251f0c9 100644
--- a/app/cdash/app/Model/BuildGroup.php
+++ b/app/cdash/app/Model/BuildGroup.php
@@ -17,11 +17,13 @@
 
 namespace CDash\Model;
 
+use App\Enums\BuildGroupType;
 use App\Models\BuildGroup as EloquentBuildGroup;
 use CDash\Database;
 use Illuminate\Support\Carbon;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Log;
+use InvalidArgumentException;
 
 class BuildGroup
 {
@@ -42,7 +44,7 @@ public function __construct()
             'endtime' => Carbon::create(1980),
             'description' => '',
             'summaryemail' => 0,
-            'type' => 'Daily',
+            'type' => BuildGroupType::DAILY,
             'includesubprojectotal' => 1,
             'emailcommitters' => 0,
         ]);
@@ -233,12 +235,20 @@ public function GetType(): string|false
             Log::error('BuildGroup GetType(): Id not set');
             return false;
         }
-        return $this->eloquent_model->type;
+        return $this->eloquent_model->type->value;
     }
 
-    public function SetType(string $type): void
+    public function SetType(string|BuildGroupType $type): void
     {
-        $this->eloquent_model->type = $type;
+        if ($type instanceof BuildGroupType) {
+            $this->eloquent_model->type = $type;
+        } else {
+            $this->eloquent_model->type = match ($type) {
+                'Daily' => BuildGroupType::DAILY,
+                'Latest' => BuildGroupType::LATEST,
+                default => throw new InvalidArgumentException("Invalid build group type: $type"),
+            };
+        }
     }
 
     /**
diff --git a/database/migrations/2026_09_10_163431_buildgroup_type_enum.php b/database/migrations/2026_09_10_163431_buildgroup_type_enum.php
new file mode 100644
index 0000000000..3d78720e79
--- /dev/null
+++ b/database/migrations/2026_09_10_163431_buildgroup_type_enum.php
@@ -0,0 +1,31 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        // We drop the type first in case the database has been truncated previously.
+        DB::statement('DROP TYPE IF EXISTS buildgrouptype');
+        DB::statement("CREATE TYPE buildgrouptype AS ENUM ('Daily', 'Latest')");
+
+        DB::statement('ALTER TABLE buildgroup ALTER COLUMN type DROP DEFAULT');
+
+        DB::statement("
+            ALTER TABLE buildgroup
+            ALTER COLUMN \"type\" TYPE buildgrouptype
+            USING CASE \"type\"
+                WHEN 'Daily' THEN 'Daily'::buildgrouptype
+                WHEN 'Latest' THEN 'Latest'::buildgrouptype
+                ELSE 'Daily'::buildgrouptype
+            END
+        ");
+
+        DB::statement("ALTER TABLE buildgroup ALTER COLUMN type SET DEFAULT 'Daily'::buildgrouptype");
+    }
+
+    public function down(): void
+    {
+    }
+};