diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Phase7Composer.cs b/src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Phase7Composer.cs
index 4ac1e333..481d21ac 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Phase7Composer.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Phase7Composer.cs
@@ -113,6 +113,11 @@ public sealed record EquipmentTagAlarmInfo(string AlarmType, int Severity);
 ///     that NodeId. <see cref="DependencyRefs"/> = the distinct <c>ctx.GetTag("…")</c> literals in
 ///     the script source.
 /// </summary>
+/// <param name="Historize">When true, this VirtualTag's values are historized (carried from the
+/// <c>VirtualTag.Historize</c> entity column). Threaded through the deploy-diff equality below so a
+/// Historize-only toggle is detected as a change. Defaults to <c>false</c> — matching both the entity
+/// default for an unset column and the artifact-decode default when the flag is absent/non-bool —
+/// which keeps existing positional+named ctor call sites compiling and preserves byte-parity.</param>
 public sealed record EquipmentVirtualTagPlan(
     string VirtualTagId,
     string EquipmentId,
@@ -120,12 +125,14 @@ public sealed record EquipmentVirtualTagPlan(
     string Name,
     string DataType,
     string Expression,
-    IReadOnlyList<string> DependencyRefs)
+    IReadOnlyList<string> DependencyRefs,
+    bool Historize = false)
 {
     /// <summary>Structural equality: the auto-generated record equality would compare
     /// <see cref="DependencyRefs"/> (an interface-typed list) BY REFERENCE, flagging every
     /// VirtualTag as "changed" on every parse (fresh list instances). Compare it element-wise
-    /// so a no-op redeploy diffs empty.</summary>
+    /// so a no-op redeploy diffs empty. <see cref="Historize"/> is included so a Historize-only
+    /// toggle is detected as a change.</summary>
     public bool Equals(EquipmentVirtualTagPlan? other) =>
         other is not null &&
         VirtualTagId == other.VirtualTagId &&
@@ -134,6 +141,7 @@ public sealed record EquipmentVirtualTagPlan(
         Name == other.Name &&
         DataType == other.DataType &&
         Expression == other.Expression &&
+        Historize == other.Historize &&
         DependencyRefs.SequenceEqual(other.DependencyRefs, StringComparer.Ordinal);
 
     public override int GetHashCode()
@@ -141,6 +149,7 @@ public sealed record EquipmentVirtualTagPlan(
         var hash = new HashCode();
         hash.Add(VirtualTagId); hash.Add(EquipmentId); hash.Add(FolderPath);
         hash.Add(Name); hash.Add(DataType); hash.Add(Expression);
+        hash.Add(Historize);
         foreach (var r in DependencyRefs) hash.Add(r, StringComparer.Ordinal);
         return hash.ToHashCode();
     }
@@ -385,7 +394,8 @@ public static class Phase7Composer
                     Name: v.Name,
                     DataType: v.DataType,
                     Expression: expanded,
-                    DependencyRefs: EquipmentScriptPaths.ExtractDependencyRefs(expanded));
+                    DependencyRefs: EquipmentScriptPaths.ExtractDependencyRefs(expanded),
+                    Historize: v.Historize);
             })
             .ToList();
 
diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/Phase7ComposerVirtualTagHistorizeTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/Phase7ComposerVirtualTagHistorizeTests.cs
new file mode 100644
index 00000000..a48499d4
--- /dev/null
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/Phase7ComposerVirtualTagHistorizeTests.cs
@@ -0,0 +1,70 @@
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.OtOpcUa.Configuration.Entities;
+using ZB.MOM.WW.OtOpcUa.Configuration.Enums;
+
+namespace ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests;
+
+/// <summary>
+/// Verifies the live-edit compose seam (<see cref="Phase7Composer.Compose"/>) carries the
+/// <see cref="VirtualTag.Historize"/> entity column onto the resulting
+/// <see cref="EquipmentVirtualTagPlan.Historize"/> (H5a). The flag was authored in the UI but
+/// never threaded onto the plan, leaving equipment-namespace runtime historization dead. Both a
+/// true and a false case are asserted so the default (false) and the explicit set both prove out.
+/// </summary>
+public sealed class Phase7ComposerVirtualTagHistorizeTests
+{
+    [Fact]
+    public void Compose_carries_virtual_tag_historize_flag_onto_plan()
+    {
+        var ns = new Namespace
+        {
+            NamespaceId = "ns-eq",
+            ClusterId = "c1",
+            Kind = NamespaceKind.Equipment,
+            NamespaceUri = "urn:eq",
+        };
+        var driver = new DriverInstance
+        {
+            DriverInstanceId = "drv-1",
+            ClusterId = "c1",
+            NamespaceId = "ns-eq",
+            Name = "Modbus1",
+            DriverType = "Modbus",
+            DriverConfig = "{}",
+        };
+        var area = new UnsArea { UnsAreaId = "area-1", ClusterId = "c1", Name = "filling" };
+        var line = new UnsLine { UnsLineId = "line-1", UnsAreaId = "area-1", Name = "line-1" };
+        var equip = new Equipment { EquipmentId = "eq-1", DriverInstanceId = "drv-1", UnsLineId = "line-1", Name = "TestMachine_001", MachineCode = "TESTMACHINE_001" };
+        var tag = new Tag
+        {
+            TagId = "tag-1",
+            DriverInstanceId = "drv-1",
+            EquipmentId = "eq-1",
+            Name = "Source",
+            DataType = "Int32",
+            AccessLevel = TagAccessLevel.Read,
+            TagConfig = "{\"FullName\":\"TestMachine_001.Source\",\"DataType\":\"Int32\"}",
+        };
+        var script = new Script
+        {
+            ScriptId = "s-1",
+            Name = "passthru",
+            SourceCode = "return ctx.GetTag(\"TestMachine_001.Source\").Value;",
+            SourceHash = "hash-1",
+        };
+        // Two VirtualTags off the same script: one historized, one not.
+        var vtHist = new VirtualTag { VirtualTagId = "vt-hist", EquipmentId = "eq-1", Name = "Historized", DataType = "Int32", ScriptId = "s-1", Historize = true };
+        var vtPlain = new VirtualTag { VirtualTagId = "vt-plain", EquipmentId = "eq-1", Name = "Plain", DataType = "Int32", ScriptId = "s-1", Historize = false };
+
+        var result = Phase7Composer.Compose(
+            new[] { area }, new[] { line }, new[] { equip },
+            new[] { driver }, Array.Empty<ScriptedAlarm>(),
+            new[] { tag }, new[] { ns },
+            virtualTags: new[] { vtHist, vtPlain },
+            scripts: new[] { script });
+
+        result.EquipmentVirtualTags.Single(p => p.VirtualTagId == "vt-hist").Historize.ShouldBeTrue();
+        result.EquipmentVirtualTags.Single(p => p.VirtualTagId == "vt-plain").Historize.ShouldBeFalse();
+    }
+}