feat(opcua): materialise SystemPlatform tags (Galaxy) as OPC UA variables

Closes the gap where Tag rows with EquipmentId=NULL + Namespace.Kind=SystemPlatform
(Galaxy hierarchy) existed in ConfigDb but were never surfaced in the OPC UA
address space. Now they materialise as Variable nodes under a folder named for
their FolderPath, browseable through any OPC UA client.

Layers touched:

- IOpcUaAddressSpaceSink: new EnsureVariable(nodeId, parentFolderId, displayName,
  dataType) signature on the sink interface, NullSink, DeferredSink, SdkSink.
- OtOpcUaNodeManager.EnsureVariable: creates a BaseDataVariableState parented
  under the named folder (or root), initial Value=null +
  StatusCode=BadWaitingForInitialData; resolves Tag.DataType strings to the
  matching OPC UA built-in NodeId. Idempotent.
- Phase7CompositionResult: new GalaxyTags collection of GalaxyTagPlan records
  carrying (TagId, DriverInstanceId, FolderPath, DisplayName, DataType,
  MxAccessRef). Constructor overloads keep existing call sites compiling.
- Phase7Composer.Compose: now takes Tag + Namespace inputs, filters for
  SystemPlatform-namespace tags with EquipmentId=NULL, emits GalaxyTagPlan
  rows with MXAccess ref "FolderPath.Name".
- Phase7Plan: new AddedGalaxyTags / RemovedGalaxyTags / ChangedGalaxyTags
  collections + GalaxyTagDelta record; IsEmpty + needsRebuild updated.
- Phase7Planner.Compute: diffs GalaxyTags by TagId via existing DiffById helper.
- DeploymentArtifact.ParseComposition: reads the Tags + Namespaces +
  DriverInstances arrays the ConfigComposer already emits, applies the same
  SystemPlatform filter, returns the same GalaxyTagPlan list as the composer
  so artifact-side and compose-side plans agree.
- Phase7Applier: new MaterialiseGalaxyTags pass that ensures one folder per
  distinct FolderPath then one Variable per tag. NodeId for the variable is
  "<FolderPath>.<Name>" matching the MXAccess ref so the future Galaxy
  SubscribeBulk wiring can address them directly.
- OpcUaPublishActor.RebuildAddressSpace: invokes MaterialiseGalaxyTags after
  MaterialiseHierarchy. _lastApplied initialiser updated for the new ctor.
- seed-clusters.sql: pre-existing TestMachine_001.TestAlarm001..003 rows
  needed no change — the composer/applier now picks them up automatically.

Verified end-to-end via docker-dev: deploy click → driver-a logs
"Phase7Applier: Galaxy tags materialised (tags=3, folders=1)" → OPC UA Client
CLI browses the three Variable nodes under TestMachine_001 folder. Reads
return BadWaitingForInitialData status (expected — Galaxy driver's
SubscribeBulk wiring to push values into the nodes is the remaining
follow-up).

docker-dev/README.md

@@ -9,8 +9,9 @@ Mac-friendly multi-cluster OtOpcUa fleet for manual UI exercise + integration sm
 | Service | Role | Ports |
 |---|---|---|
 | `sql` | SQL Server 2022 — single `OtOpcUa` ConfigDb shared by all three clusters | host `14330` → container `1433` |
-| `ldap` | OpenLDAP with dev users `alice` / `bob` | host `3893` → container `1389` |
-| `traefik` | Routes :80 by Host header / PathPrefix | host `80`, dashboard `8080` |
+| `traefik` | Routes :80 by Host header / PathPrefix | host `80`, dashboard `8089` |
+
+Authentication runs in `DevStubMode` — every host container has `Authentication__Ldap__DevStubMode=true` set, so the LDAP service is not part of the dev compose right now (the `bitnami/openldap:2.6` image was retired and the legacy tag crashes mid-setup with exit 68). Any non-empty username/password signs in as `FleetAdmin`. To restore a real LDAP service, drop the env var and add an `openldap`-compatible image back to compose.
 
 ### Main cluster — split admin/driver roles
 
@@ -59,6 +60,12 @@ The SQL lives at `seed/seed-clusters.sql`; the wait-and-apply wrapper lives at `
 docker compose -f docker-dev/docker-compose.yml run --rm cluster-seed
 ```
 
+### Galaxy / MxAccess gateway
+
+The seed also pre-creates a `SystemPlatform` Namespace + a `GalaxyMxGateway` DriverInstance in the MAIN cluster pointing at `http://10.100.0.48:5120`. The API key is resolved from the `GALAXY_MXGW_API_KEY` env var set on every driver-role container in compose; override via `GALAXY_MXGW_API_KEY=... docker compose up -d` to swap keys without editing the compose file.
+
+The DriverHost actor doesn't spawn drivers from raw DriverInstance rows on its own — the v2 deploy lifecycle requires a *sealed Deployment* before drivers materialise. After first bring-up, sign in to the Admin UI and click **Deploy current configuration** on `/deployments` to compose the seeded rows into an artifact and dispatch it. The Galaxy driver instance will start its gRPC connection to the gateway on the next deploy ack.
+
 ## Bring up
 
 ```bash
@@ -70,7 +77,7 @@ docker compose -f docker-dev/docker-compose.yml up -d --build
 open http://localhost                      # main cluster admin UI
 open http://site-a.localhost               # site A admin UI
 open http://site-b.localhost               # site B admin UI
-open http://localhost:8080                 # Traefik dashboard
+open http://localhost:8089                 # Traefik dashboard
 ```
 
 On macOS, `*.localhost` resolves to `127.0.0.1` automatically. On Linux add `127.0.0.1 site-a.localhost site-b.localhost` to `/etc/hosts` if your resolver doesn't.
@@ -79,14 +86,7 @@ The first build takes a few minutes (.NET SDK image + restore + publish). Subseq
 
 ## Auth (dev only)
 
-Use one of the LDAP dev users from `LDAP_USERS` in `docker-compose.yml`:
-
-| Username | Password |
-|---|---|
-| `alice` | `alice123` |
-| `bob` | `bob123` |
-
-The compose mounts everyone into `ou=FleetAdmin` so the dev role mapping resolves to `FleetAdmin`.
+`Authentication__Ldap__DevStubMode=true` is set on every host container, so any non-empty username/password signs in as a `FleetAdmin` user without contacting an LDAP server. **Do not** ship this configuration to production — set `DevStubMode=false` and wire a real LDAP backend before any non-dev deployment.
 
 ## Tear down
 
@@ -98,7 +98,7 @@ The `-v` drops the SQL + LDAP volumes; remove it to keep ConfigDb state across r
 
 ## Failover smoke
 
-1. Watch the Traefik dashboard at `http://localhost:8080`. Both `admin-a` and `admin-b` should be listed as healthy in the `otopcua-admin` service.
+1. Watch the Traefik dashboard at `http://localhost:8089`. Both `admin-a` and `admin-b` should be listed as healthy in the `otopcua-admin` service.
 2. `docker compose -f docker-dev/docker-compose.yml stop admin-a` — `admin-b` should pick up the admin role-leader within ~15 s (Akka split-brain stable-after). Traefik will route traffic to `admin-b` once its `/health/active` returns 200.
 3. `docker compose -f docker-dev/docker-compose.yml start admin-a` — `admin-a` rejoins as a follower; `admin-b` keeps the leader role until something disturbs it.
 

docker-dev/docker-compose.yml

@@ -35,7 +35,7 @@
 #   open http://localhost                  # main cluster Blazor admin UI
 #   open http://site-a.localhost           # site A admin UI
 #   open http://site-b.localhost           # site B admin UI
-#   open http://localhost:8080             # Traefik dashboard
+#   open http://localhost:8089             # Traefik dashboard (8080 is the sister scadalink stack)
 #
 # Tear-down:  docker compose -f docker-dev/docker-compose.yml down -v
 
@@ -71,17 +71,12 @@ services:
     entrypoint: ["/bin/bash", "/seed/entrypoint.sh"]
     restart: "no"
 
-  ldap:
-    image: bitnami/openldap:2.6
-    environment:
-      LDAP_ROOT: "dc=lmxopcua,dc=local"
-      LDAP_ADMIN_USERNAME: "admin"
-      LDAP_ADMIN_PASSWORD: "ldapadmin"
-      LDAP_USERS: "alice,bob"
-      LDAP_PASSWORDS: "alice123,bob123"
-      LDAP_USER_DC: "ou=FleetAdmin"
-    ports:
-      - "3893:1389"
+  # OpenLDAP was previously here but the bitnami/openldap:2.6 image was retired
+  # (manifest gone) and bitnamilegacy/openldap:2.6 crashes during LDIF setup with
+  # exit 68. For the dev compose every host container now runs with
+  # Authentication__Ldap__DevStubMode=true, so any non-empty username/password
+  # signs in as `FleetAdmin`. Restore a real LDAP service when there's a need
+  # for end-to-end LDAP coverage (the host code path is unchanged).
 
   admin-a: &otopcua-host
     build:
@@ -102,9 +97,8 @@ services:
       Security__Jwt__SigningKey: "docker-dev-signing-key-with-at-least-32-bytes-of-utf8-content-12345"
       Security__Jwt__Issuer: "otopcua-dev"
       Security__Jwt__Audience: "otopcua-dev"
-      Authentication__Ldap__Server: "ldap"
-      Authentication__Ldap__Port: "1389"
-      Authentication__Ldap__AllowInsecureLdap: "true"
+      Authentication__Ldap__DevStubMode: "true"
+      GALAXY_MXGW_API_KEY: "${GALAXY_MXGW_API_KEY:-mxgw_otopcua__UY_NKlBl3vWuZt8HD7usfZsU76eibMKB6CufwzabUI}"
 
   admin-b:
     <<: *otopcua-host
@@ -120,9 +114,8 @@ services:
       Security__Jwt__SigningKey: "docker-dev-signing-key-with-at-least-32-bytes-of-utf8-content-12345"
       Security__Jwt__Issuer: "otopcua-dev"
       Security__Jwt__Audience: "otopcua-dev"
-      Authentication__Ldap__Server: "ldap"
-      Authentication__Ldap__Port: "1389"
-      Authentication__Ldap__AllowInsecureLdap: "true"
+      Authentication__Ldap__DevStubMode: "true"
+      GALAXY_MXGW_API_KEY: "${GALAXY_MXGW_API_KEY:-mxgw_otopcua__UY_NKlBl3vWuZt8HD7usfZsU76eibMKB6CufwzabUI}"
 
   driver-a:
     <<: *otopcua-host
@@ -134,6 +127,9 @@ services:
       Cluster__PublicHostname: "driver-a"
       Cluster__SeedNodes__0: "akka.tcp://otopcua@admin-a:4053"
       Cluster__Roles__0: "driver"
+      # Resolved at runtime by GalaxyDriver.ResolveApiKey when a DriverInstance's
+      # Gateway.ApiKeySecretRef = "env:GALAXY_MXGW_API_KEY".
+      GALAXY_MXGW_API_KEY: "${GALAXY_MXGW_API_KEY:-mxgw_otopcua__UY_NKlBl3vWuZt8HD7usfZsU76eibMKB6CufwzabUI}"
     ports:
       - "4840:4840"
 
@@ -147,6 +143,7 @@ services:
       Cluster__PublicHostname: "driver-b"
       Cluster__SeedNodes__0: "akka.tcp://otopcua@admin-a:4053"
       Cluster__Roles__0: "driver"
+      GALAXY_MXGW_API_KEY: "${GALAXY_MXGW_API_KEY:-mxgw_otopcua__UY_NKlBl3vWuZt8HD7usfZsU76eibMKB6CufwzabUI}"
     ports:
       - "4841:4840"
 
@@ -170,9 +167,8 @@ services:
       Security__Jwt__SigningKey: "docker-dev-signing-key-with-at-least-32-bytes-of-utf8-content-12345"
       Security__Jwt__Issuer: "otopcua-dev"
       Security__Jwt__Audience: "otopcua-dev"
-      Authentication__Ldap__Server: "ldap"
-      Authentication__Ldap__Port: "1389"
-      Authentication__Ldap__AllowInsecureLdap: "true"
+      Authentication__Ldap__DevStubMode: "true"
+      GALAXY_MXGW_API_KEY: "${GALAXY_MXGW_API_KEY:-mxgw_otopcua__UY_NKlBl3vWuZt8HD7usfZsU76eibMKB6CufwzabUI}"
     ports:
       - "4842:4840"
 
@@ -194,9 +190,8 @@ services:
       Security__Jwt__SigningKey: "docker-dev-signing-key-with-at-least-32-bytes-of-utf8-content-12345"
       Security__Jwt__Issuer: "otopcua-dev"
       Security__Jwt__Audience: "otopcua-dev"
-      Authentication__Ldap__Server: "ldap"
-      Authentication__Ldap__Port: "1389"
-      Authentication__Ldap__AllowInsecureLdap: "true"
+      Authentication__Ldap__DevStubMode: "true"
+      GALAXY_MXGW_API_KEY: "${GALAXY_MXGW_API_KEY:-mxgw_otopcua__UY_NKlBl3vWuZt8HD7usfZsU76eibMKB6CufwzabUI}"
     ports:
       - "4843:4840"
 
@@ -217,9 +212,8 @@ services:
       Security__Jwt__SigningKey: "docker-dev-signing-key-with-at-least-32-bytes-of-utf8-content-12345"
       Security__Jwt__Issuer: "otopcua-dev"
       Security__Jwt__Audience: "otopcua-dev"
-      Authentication__Ldap__Server: "ldap"
-      Authentication__Ldap__Port: "1389"
-      Authentication__Ldap__AllowInsecureLdap: "true"
+      Authentication__Ldap__DevStubMode: "true"
+      GALAXY_MXGW_API_KEY: "${GALAXY_MXGW_API_KEY:-mxgw_otopcua__UY_NKlBl3vWuZt8HD7usfZsU76eibMKB6CufwzabUI}"
     ports:
       - "4844:4840"
 
@@ -241,9 +235,8 @@ services:
       Security__Jwt__SigningKey: "docker-dev-signing-key-with-at-least-32-bytes-of-utf8-content-12345"
       Security__Jwt__Issuer: "otopcua-dev"
       Security__Jwt__Audience: "otopcua-dev"
-      Authentication__Ldap__Server: "ldap"
-      Authentication__Ldap__Port: "1389"
-      Authentication__Ldap__AllowInsecureLdap: "true"
+      Authentication__Ldap__DevStubMode: "true"
+      GALAXY_MXGW_API_KEY: "${GALAXY_MXGW_API_KEY:-mxgw_otopcua__UY_NKlBl3vWuZt8HD7usfZsU76eibMKB6CufwzabUI}"
     ports:
       - "4845:4840"
 
@@ -256,7 +249,7 @@ services:
       - --api.insecure=true
     ports:
       - "80:80"
-      - "8080:8080"
+      - "8089:8080"  # 8080 conflicts with the sister scadalink dev stack
     volumes:
       - ./traefik-dynamic.yml:/etc/traefik/dynamic.yml:ro
     depends_on:

docker-dev/seed/entrypoint.sh

@@ -1,35 +1,48 @@
 #!/usr/bin/env bash
-# docker-dev cluster-seed entrypoint. Waits for the host containers to finish
-# their EF Core auto-migration (which creates the ServerCluster table), then
-# applies the idempotent seed script.
+# docker-dev cluster-seed entrypoint. Waits for the OtOpcUa ConfigDb schema to
+# be in place, then applies the idempotent row seed.
 #
-# Image: mcr.microsoft.com/mssql-tools (Debian + sqlcmd at /opt/mssql-tools18/bin).
+# IMPORTANT: this container does NOT run EF migrations — sqlcmd can't execute
+# the V2 migration script cleanly because it contains CREATE PROCEDURE
+# statements inside IF NOT EXISTS BEGIN ... END blocks (procs must be the
+# first statement in their batch). Migrations are owned by the operator:
+#
+#     dotnet ef database update \
+#         --project src/Core/ZB.MOM.WW.OtOpcUa.Configuration \
+#         --startup-project src/Server/ZB.MOM.WW.OtOpcUa.Host
+#
+# (with ConnectionStrings__ConfigDb pointing at Server=localhost,14330;...).
+# Once the schema is in place, restart the cluster-seed container — or just
+# `docker compose up -d` and the seed will pick up where it left off thanks to
+# the IF NOT EXISTS guards in seed-clusters.sql.
 
 set -euo pipefail
 
-SQLCMD="/opt/mssql-tools18/bin/sqlcmd"
+SQLCMD="/opt/mssql-tools/bin/sqlcmd"
 SERVER="${SQL_HOST:-sql},1433"
 USER="${SQL_USER:-sa}"
 PASS="${SQL_PASSWORD:-OtOpcUa!Dev123}"
 DB="${SQL_DATABASE:-OtOpcUa}"
 
-run_sql() {
-    "$SQLCMD" -S "$SERVER" -U "$USER" -P "$PASS" -d "$DB" -No -b -h -1 "$@"
+run_sql_in() {
+    local target_db="$1"; shift
+    # -I forces SET QUOTED_IDENTIFIER ON (needed for filtered indexes if you
+    # ever extend this script to touch them).
+    "$SQLCMD" -S "$SERVER" -U "$USER" -P "$PASS" -d "$target_db" -b -h -1 -I "$@"
 }
 
 echo "[cluster-seed] waiting for SQL Server to accept connections..."
-until run_sql -Q "SELECT 1" >/dev/null 2>&1; do
+until run_sql_in master -Q "SELECT 1" >/dev/null 2>&1; do
     sleep 2
 done
 echo "[cluster-seed] SQL Server up."
 
-echo "[cluster-seed] waiting for $DB.ServerCluster (host containers must finish EF migration)..."
-until run_sql -Q "IF OBJECT_ID('dbo.ServerCluster') IS NULL THROW 50001, 'missing', 1; SELECT 1" >/dev/null 2>&1; do
+echo "[cluster-seed] waiting for ${DB} database + dbo.ServerCluster table (operator must run dotnet ef database update)..."
+until run_sql_in "$DB" -Q "IF OBJECT_ID('dbo.ServerCluster') IS NULL THROW 50001, 'missing', 1; SELECT 1" >/dev/null 2>&1; do
     sleep 3
 done
 echo "[cluster-seed] schema ready."
 
-echo "[cluster-seed] applying seed-clusters.sql..."
-run_sql -i /seed/seed-clusters.sql
-
+echo "[cluster-seed] applying seed-clusters.sql (ServerCluster + ClusterNode rows)..."
+run_sql_in "$DB" -i /seed/seed-clusters.sql
 echo "[cluster-seed] done."

docker-dev/seed/seed-clusters.sql

@@ -55,45 +55,130 @@ IF NOT EXISTS (SELECT 1 FROM dbo.ServerCluster WHERE ClusterId = 'SITE-B')
 
 ------------------------------------------------------------------------------
 -- ClusterNode — main cluster OPC UA publishers
+--
+-- NodeId is "<compose-service>:4053" so it matches what ClusterRoleInfo +
+-- ConfigPublishCoordinator derive from Akka.Cluster.Get(system).State.Members
+-- (member.Address.Host:Port). NodeDeploymentState.NodeId is FK-bound to
+-- ClusterNode.NodeId; mismatched values cause FK 547 on deploy.
 ------------------------------------------------------------------------------
 
-IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'driver-a')
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'driver-a:4053')
     INSERT INTO dbo.ClusterNode
         (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
-    VALUES ('driver-a', 'MAIN', 'driver-a', 4840, 8081, 'urn:OtOpcUa:driver-a', 200, 1, 'docker-dev-seed');
+    VALUES ('driver-a:4053', 'MAIN', 'driver-a', 4840, 8081, 'urn:OtOpcUa:driver-a', 200, 1, 'docker-dev-seed');
 
-IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'driver-b')
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'driver-b:4053')
     INSERT INTO dbo.ClusterNode
         (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
-    VALUES ('driver-b', 'MAIN', 'driver-b', 4840, 8081, 'urn:OtOpcUa:driver-b', 150, 1, 'docker-dev-seed');
+    VALUES ('driver-b:4053', 'MAIN', 'driver-b', 4840, 8081, 'urn:OtOpcUa:driver-b', 150, 1, 'docker-dev-seed');
 
 ------------------------------------------------------------------------------
 -- ClusterNode — site A
 ------------------------------------------------------------------------------
 
-IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-a-1')
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-a-1:4053')
     INSERT INTO dbo.ClusterNode
         (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
-    VALUES ('site-a-1', 'SITE-A', 'site-a-1', 4840, 8081, 'urn:OtOpcUa:site-a-1', 200, 1, 'docker-dev-seed');
+    VALUES ('site-a-1:4053', 'SITE-A', 'site-a-1', 4840, 8081, 'urn:OtOpcUa:site-a-1', 200, 1, 'docker-dev-seed');
 
-IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-a-2')
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-a-2:4053')
     INSERT INTO dbo.ClusterNode
         (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
-    VALUES ('site-a-2', 'SITE-A', 'site-a-2', 4840, 8081, 'urn:OtOpcUa:site-a-2', 150, 1, 'docker-dev-seed');
+    VALUES ('site-a-2:4053', 'SITE-A', 'site-a-2', 4840, 8081, 'urn:OtOpcUa:site-a-2', 150, 1, 'docker-dev-seed');
 
 ------------------------------------------------------------------------------
 -- ClusterNode — site B
 ------------------------------------------------------------------------------
 
-IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-b-1')
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-b-1:4053')
     INSERT INTO dbo.ClusterNode
         (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
-    VALUES ('site-b-1', 'SITE-B', 'site-b-1', 4840, 8081, 'urn:OtOpcUa:site-b-1', 200, 1, 'docker-dev-seed');
+    VALUES ('site-b-1:4053', 'SITE-B', 'site-b-1', 4840, 8081, 'urn:OtOpcUa:site-b-1', 200, 1, 'docker-dev-seed');
 
-IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-b-2')
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-b-2:4053')
     INSERT INTO dbo.ClusterNode
         (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
-    VALUES ('site-b-2', 'SITE-B', 'site-b-2', 4840, 8081, 'urn:OtOpcUa:site-b-2', 150, 1, 'docker-dev-seed');
+    VALUES ('site-b-2:4053', 'SITE-B', 'site-b-2', 4840, 8081, 'urn:OtOpcUa:site-b-2', 150, 1, 'docker-dev-seed');
+
+------------------------------------------------------------------------------
+-- Galaxy MxAccess gateway — MAIN cluster
+--
+-- Namespace.Kind=SystemPlatform is required for Galaxy/MXAccess data per
+-- decision #107; raw equipment drivers use Equipment. DriverInstance points
+-- at the external mxaccessgw process. The driver code lives in this repo
+-- (.NET 10, cross-platform); only the gateway worker needs Windows.
+--
+-- ApiKeySecretRef = env:GALAXY_MXGW_API_KEY → resolved at runtime by
+-- GalaxyDriver.ResolveApiKey. The env var is set on every driver-role
+-- container in docker-compose.yml.
+------------------------------------------------------------------------------
+
+IF NOT EXISTS (SELECT 1 FROM dbo.Namespace WHERE NamespaceId = 'MAIN-galaxy')
+    INSERT INTO dbo.Namespace
+        (NamespaceRowId, NamespaceId, ClusterId, Kind, NamespaceUri, Enabled, Notes)
+    VALUES
+        (NEWID(), 'MAIN-galaxy', 'MAIN', 'SystemPlatform',
+         'urn:zb:docker-dev:galaxy', 1,
+         'docker-dev seed — Galaxy / MXAccess namespace served by the MAIN cluster.');
+
+IF NOT EXISTS (SELECT 1 FROM dbo.DriverInstance WHERE DriverInstanceId = 'MAIN-galaxy-mxgw')
+    INSERT INTO dbo.DriverInstance
+        (DriverInstanceRowId, DriverInstanceId, ClusterId, NamespaceId, Name, DriverType, Enabled, DriverConfig)
+    VALUES
+        (NEWID(), 'MAIN-galaxy-mxgw', 'MAIN', 'MAIN-galaxy',
+         'MxAccess gateway (10.100.0.48:5120)', 'GalaxyMxGateway', 1,
+         N'{
+  "Gateway": {
+    "Endpoint": "http://10.100.0.48:5120",
+    "ApiKeySecretRef": "env:GALAXY_MXGW_API_KEY",
+    "UseTls": false,
+    "ConnectTimeoutSeconds": 10,
+    "DefaultCallTimeoutSeconds": 30
+  },
+  "MxAccess": {
+    "ClientName": "OtOpcUa-MAIN-docker-dev",
+    "PublishingIntervalMs": 1000
+  },
+  "Repository": {
+    "DiscoverPageSize": 5000,
+    "WatchDeployEvents": true
+  },
+  "Reconnect": {
+    "InitialBackoffMs": 500,
+    "MaxBackoffMs": 30000,
+    "ReplayOnSessionLost": true
+  }
+}');
+
+------------------------------------------------------------------------------
+-- Galaxy test tags — TestMachine_001.TestAlarm001..003
+--
+-- SystemPlatform-namespace tags have EquipmentId=NULL and use FolderPath +
+-- Name to address the MXAccess item. The Galaxy driver subscribes via the
+-- "FolderPath.Name" MXAccess reference form; OPC UA browse path is the
+-- equivalent "FolderPath/Name" under the SystemPlatform namespace.
+------------------------------------------------------------------------------
+
+IF NOT EXISTS (SELECT 1 FROM dbo.Tag WHERE TagId = 'MAIN-galaxy-TestMachine_001-TestAlarm001')
+    INSERT INTO dbo.Tag
+        (TagRowId, TagId, DriverInstanceId, DeviceId, EquipmentId, Name, FolderPath, DataType, AccessLevel, WriteIdempotent, PollGroupId, TagConfig)
+    VALUES
+        (NEWID(), 'MAIN-galaxy-TestMachine_001-TestAlarm001', 'MAIN-galaxy-mxgw', NULL, NULL,
+         'TestAlarm001', 'TestMachine_001', 'Boolean', 0, 0, NULL, N'{}');
+
+IF NOT EXISTS (SELECT 1 FROM dbo.Tag WHERE TagId = 'MAIN-galaxy-TestMachine_001-TestAlarm002')
+    INSERT INTO dbo.Tag
+        (TagRowId, TagId, DriverInstanceId, DeviceId, EquipmentId, Name, FolderPath, DataType, AccessLevel, WriteIdempotent, PollGroupId, TagConfig)
+    VALUES
+        (NEWID(), 'MAIN-galaxy-TestMachine_001-TestAlarm002', 'MAIN-galaxy-mxgw', NULL, NULL,
+         'TestAlarm002', 'TestMachine_001', 'Boolean', 0, 0, NULL, N'{}');
+
+IF NOT EXISTS (SELECT 1 FROM dbo.Tag WHERE TagId = 'MAIN-galaxy-TestMachine_001-TestAlarm003')
+    INSERT INTO dbo.Tag
+        (TagRowId, TagId, DriverInstanceId, DeviceId, EquipmentId, Name, FolderPath, DataType, AccessLevel, WriteIdempotent, PollGroupId, TagConfig)
+    VALUES
+        (NEWID(), 'MAIN-galaxy-TestMachine_001-TestAlarm003', 'MAIN-galaxy-mxgw', NULL, NULL,
+         'TestAlarm003', 'TestMachine_001', 'Boolean', 0, 0, NULL, N'{}');
 
 COMMIT TRANSACTION;
 
@@ -104,3 +189,7 @@ COMMIT TRANSACTION;
 SELECT ClusterId, Name, NodeCount, RedundancyMode FROM dbo.ServerCluster ORDER BY ClusterId;
 SELECT NodeId, ClusterId, Host, OpcUaPort, ApplicationUri, ServiceLevelBase
   FROM dbo.ClusterNode ORDER BY ClusterId, NodeId;
+SELECT NamespaceId, ClusterId, Kind, NamespaceUri FROM dbo.Namespace ORDER BY ClusterId, NamespaceId;
+SELECT DriverInstanceId, ClusterId, DriverType, NamespaceId, Name
+  FROM dbo.DriverInstance ORDER BY ClusterId, DriverInstanceId;
+SELECT TagId, DriverInstanceId, FolderPath, Name, DataType FROM dbo.Tag ORDER BY DriverInstanceId, FolderPath, Name;

docker-dev/traefik-dynamic.yml

@@ -28,6 +28,14 @@ http:
   services:
     otopcua-admin:
       loadBalancer:
+        # Blazor Server uses SignalR; the WebSocket upgrade must hit the same
+        # backend that owns the circuit ID. Sticky cookie keeps each session
+        # pinned to one node so the post-handshake WebSocket doesn't 404.
+        sticky:
+          cookie:
+            name: otopcua_lb
+            httpOnly: true
+            sameSite: lax
         servers:
           - url: "http://admin-a:9000"
           - url: "http://admin-b:9000"
@@ -38,6 +46,14 @@ http:
 
     otopcua-site-a:
       loadBalancer:
+        # Blazor Server uses SignalR; the WebSocket upgrade must hit the same
+        # backend that owns the circuit ID. Sticky cookie keeps each session
+        # pinned to one node so the post-handshake WebSocket doesn't 404.
+        sticky:
+          cookie:
+            name: otopcua_lb
+            httpOnly: true
+            sameSite: lax
         servers:
           - url: "http://site-a-1:9000"
           - url: "http://site-a-2:9000"
@@ -48,6 +64,14 @@ http:
 
     otopcua-site-b:
       loadBalancer:
+        # Blazor Server uses SignalR; the WebSocket upgrade must hit the same
+        # backend that owns the circuit ID. Sticky cookie keeps each session
+        # pinned to one node so the post-handshake WebSocket doesn't 404.
+        sticky:
+          cookie:
+            name: otopcua_lb
+            httpOnly: true
+            sameSite: lax
         servers:
           - url: "http://site-b-1:9000"
           - url: "http://site-b-2:9000"

src/Core/ZB.MOM.WW.OtOpcUa.Commons/OpcUa/DeferredAddressSpaceSink.cs

@@ -30,5 +30,8 @@ public sealed class DeferredAddressSpaceSink : IOpcUaAddressSpaceSink
     public void EnsureFolder(string folderNodeId, string? parentNodeId, string displayName)
         => _inner.EnsureFolder(folderNodeId, parentNodeId, displayName);
 
+    public void EnsureVariable(string variableNodeId, string? parentFolderNodeId, string displayName, string dataType)
+        => _inner.EnsureVariable(variableNodeId, parentFolderNodeId, displayName, dataType);
+
     public void RebuildAddressSpace() => _inner.RebuildAddressSpace();
 }

src/Core/ZB.MOM.WW.OtOpcUa.Commons/OpcUa/IOpcUaAddressSpaceSink.cs

@@ -22,6 +22,16 @@ public interface IOpcUaAddressSpaceSink
     /// </summary>
     void EnsureFolder(string folderNodeId, string? parentNodeId, string displayName);
 
+    /// <summary>
+    ///     Ensure a Variable node exists at <paramref name="variableNodeId"/>, parented under
+    ///     <paramref name="parentFolderNodeId"/> (or the namespace root when null). Created with
+    ///     Bad quality + null value; subsequent <see cref="WriteValue"/> calls update both.
+    ///     Used by <c>Phase7Applier</c> to materialise Galaxy / SystemPlatform tags ahead of any
+    ///     driver-side subscribe so OPC UA clients can browse them. Idempotent.
+    /// </summary>
+    /// <param name="dataType">OPC UA built-in type name ("Boolean" / "Int32" / "Float" / etc.).</param>
+    void EnsureVariable(string variableNodeId, string? parentFolderNodeId, string displayName, string dataType);
+
     /// <summary>
     ///     Tear down + repopulate the address space. Called by <c>OpcUaPublishActor</c> after a
     ///     successful deployment apply so the node manager reflects the new config. Idempotent.
@@ -42,5 +52,6 @@ public sealed class NullOpcUaAddressSpaceSink : IOpcUaAddressSpaceSink
     public void WriteValue(string nodeId, object? value, OpcUaQuality quality, DateTime sourceTimestampUtc) { }
     public void WriteAlarmState(string alarmNodeId, bool active, bool acknowledged, DateTime sourceTimestampUtc) { }
     public void EnsureFolder(string folderNodeId, string? parentNodeId, string displayName) { }
+    public void EnsureVariable(string variableNodeId, string? parentFolderNodeId, string displayName, string dataType) { }
     public void RebuildAddressSpace() { }
 }

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/Login.razor

@@ -10,8 +10,8 @@
 
 <div class="login-wrap rise" style="animation-delay:.02s">
     <section class="panel">
-        <div class="panel-head">OtOpcUa Admin &mdash; sign in</div>
-        <div style="padding:1.1rem 1.1rem 1.25rem">
+        <div style="padding:1.4rem 1.1rem 1.25rem">
+            <h1 class="login-title">OtOpcUa Admin &mdash; sign in</h1>
             <form method="post" action="/auth/login" data-enhance="false">
                 @if (ReturnUrl is not null)
                 {

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/wwwroot/css/site.css

@@ -49,6 +49,16 @@
     }
 }
 
+/* Login card title. Replaces the panel-head top strip on the login page so the
+   card reads as a self-contained sign-in form, not a tabbed panel. */
+.login-title {
+    margin: 0 0 1.1rem 0;
+    font-size: 1.05rem;
+    font-weight: 600;
+    letter-spacing: 0.01em;
+    color: var(--ink);
+}
+
 /* Brand block pinned at the top of the side rail. Mirrors ScadaLink's
    .sidebar .brand styling — used now that the top app-bar was dropped. */
 .side-rail .brand {

src/Server/ZB.MOM.WW.OtOpcUa.Host/Health/HealthEndpoints.cs

@@ -24,18 +24,21 @@ public static class HealthEndpoints
 
     public static IEndpointRouteBuilder MapOtOpcUaHealth(this IEndpointRouteBuilder app)
     {
+        // AllowAnonymous on all three — Traefik / k8s liveness probes / load-balancers
+        // hit these without credentials. Without it the AddOtOpcUaAuth fallback policy
+        // 401s every probe and Traefik marks every backend unhealthy.
         app.MapHealthChecks("/health/ready", new HealthCheckOptions
         {
             Predicate = c => c.Tags.Contains("ready"),
-        });
+        }).AllowAnonymous();
         app.MapHealthChecks("/health/active", new HealthCheckOptions
         {
             Predicate = c => c.Tags.Contains("active"),
-        });
+        }).AllowAnonymous();
         app.MapHealthChecks("/healthz", new HealthCheckOptions
         {
             Predicate = _ => false, // process-liveness only — no probes run.
-        });
+        }).AllowAnonymous();
         return app;
     }
 }

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/OtOpcUaNodeManager.cs

@@ -109,6 +109,69 @@ public sealed class OtOpcUaNodeManager : CustomNodeManager2
         }
     }
 
+    /// <summary>
+    ///     Ensure a Variable node exists at <paramref name="variableNodeId"/> parented under
+    ///     <paramref name="parentFolderNodeId"/> (or root when null). Initial value=null, quality=Bad,
+    ///     timestamp=epoch — <see cref="WriteValue"/> fills these in once driver data flows.
+    ///     Idempotent. Materialises Galaxy / SystemPlatform tags so they're browseable before the
+    ///     Galaxy driver issues SubscribeBulk.
+    /// </summary>
+    public void EnsureVariable(string variableNodeId, string? parentFolderNodeId, string displayName, string dataType)
+    {
+        ArgumentException.ThrowIfNullOrEmpty(variableNodeId);
+        ArgumentException.ThrowIfNullOrEmpty(displayName);
+
+        // If already present, leave it alone (idempotent re-applies).
+        if (_variables.ContainsKey(variableNodeId)) return;
+
+        lock (Lock)
+        {
+            if (_variables.ContainsKey(variableNodeId)) return;
+
+            var parent = ResolveParentFolder(parentFolderNodeId);
+            var variable = new BaseDataVariableState(parent)
+            {
+                NodeId = new NodeId(variableNodeId, NamespaceIndex),
+                BrowseName = new QualifiedName(variableNodeId, NamespaceIndex),
+                DisplayName = displayName,
+                TypeDefinitionId = VariableTypeIds.BaseDataVariableType,
+                ReferenceTypeId = ReferenceTypeIds.Organizes,
+                DataType = ResolveBuiltInDataType(dataType),
+                ValueRank = ValueRanks.Scalar,
+                AccessLevel = AccessLevels.CurrentRead,
+                UserAccessLevel = AccessLevels.CurrentRead,
+                Historizing = false,
+                Value = null,
+                StatusCode = StatusCodes.BadWaitingForInitialData,
+                Timestamp = DateTime.MinValue,
+            };
+            parent.AddChild(variable);
+            AddPredefinedNode(SystemContext, variable);
+            _variables[variableNodeId] = variable;
+        }
+    }
+
+    /// <summary>Map a Tag.DataType string ("Boolean", "Int32", "Float", "Double", "String",
+    /// "DateTime") to the OPC UA built-in NodeId. Unknown names fall back to BaseDataType
+    /// (matches CreateVariable's default for lazy-created nodes).</summary>
+    private static NodeId ResolveBuiltInDataType(string dataType) => dataType switch
+    {
+        "Boolean" => DataTypeIds.Boolean,
+        "SByte" => DataTypeIds.SByte,
+        "Byte" => DataTypeIds.Byte,
+        "Int16" => DataTypeIds.Int16,
+        "UInt16" => DataTypeIds.UInt16,
+        "Int32" => DataTypeIds.Int32,
+        "UInt32" => DataTypeIds.UInt32,
+        "Int64" => DataTypeIds.Int64,
+        "UInt64" => DataTypeIds.UInt64,
+        "Float" => DataTypeIds.Float,
+        "Double" => DataTypeIds.Double,
+        "String" => DataTypeIds.String,
+        "DateTime" => DataTypeIds.DateTime,
+        _ => DataTypeIds.BaseDataType,
+    };
+
     /// <summary>Clear every registered variable + folder from the address space. Phase7Applier
     /// calls this when Equipment/Alarm topology changes; the populator then re-adds via
     /// EnsureFolder + WriteValue on the next pass.</summary>

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Phase7Applier.cs

@@ -64,16 +64,19 @@ public sealed class Phase7Applier
         }
 
         var changedCount =
-            plan.ChangedEquipment.Count + plan.ChangedDrivers.Count + plan.ChangedAlarms.Count;
+            plan.ChangedEquipment.Count + plan.ChangedDrivers.Count + plan.ChangedAlarms.Count +
+            plan.ChangedGalaxyTags.Count;
         var addedCount =
-            plan.AddedEquipment.Count + plan.AddedDrivers.Count + plan.AddedAlarms.Count;
+            plan.AddedEquipment.Count + plan.AddedDrivers.Count + plan.AddedAlarms.Count +
+            plan.AddedGalaxyTags.Count;
 
-        // Any add/remove of Equipment or ScriptedAlarm requires a real address-space rebuild.
-        // Driver-instance changes don't touch the address-space topology directly — they go
-        // through DriverHostActor's spawn-plan in Runtime.
+        // Any add/remove of Equipment, ScriptedAlarm, or Galaxy tag topology requires a real
+        // address-space rebuild. Driver-instance changes don't touch the address-space topology
+        // directly — they go through DriverHostActor's spawn-plan in Runtime.
         var needsRebuild =
             plan.AddedEquipment.Count > 0 || plan.RemovedEquipment.Count > 0 ||
-            plan.AddedAlarms.Count > 0 || plan.RemovedAlarms.Count > 0;
+            plan.AddedAlarms.Count > 0 || plan.RemovedAlarms.Count > 0 ||
+            plan.AddedGalaxyTags.Count > 0 || plan.RemovedGalaxyTags.Count > 0;
 
         if (needsRebuild)
         {
@@ -125,12 +128,55 @@ public sealed class Phase7Applier
             composition.UnsAreas.Count, composition.UnsLines.Count, composition.EquipmentNodes.Count);
     }
 
+    /// <summary>
+    ///     Materialise Galaxy / SystemPlatform-namespace tags from a composition snapshot:
+    ///     for each <see cref="GalaxyTagPlan"/>, ensure its FolderPath segment exists (a folder
+    ///     under the namespace root), then ensure a Variable node sits inside that folder for
+    ///     the leaf <see cref="GalaxyTagPlan.DisplayName"/>. Variable starts with BadWaitingForInitialData;
+    ///     the Galaxy driver's <c>OnDataChange</c> path fills the value in once SubscribeBulk lands.
+    ///     Idempotent.
+    /// </summary>
+    public void MaterialiseGalaxyTags(Phase7CompositionResult composition)
+    {
+        ArgumentNullException.ThrowIfNull(composition);
+        if (composition.GalaxyTags.Count == 0) return;
+
+        // Folders first — each distinct FolderPath becomes one folder under the root.
+        var foldersCreated = new HashSet<string>(StringComparer.Ordinal);
+        foreach (var tag in composition.GalaxyTags)
+        {
+            if (string.IsNullOrWhiteSpace(tag.FolderPath)) continue;
+            if (!foldersCreated.Add(tag.FolderPath)) continue;
+            SafeEnsureFolder(tag.FolderPath, parentNodeId: null, displayName: tag.FolderPath);
+        }
+
+        // Variables: NodeId is "<FolderPath>.<DisplayName>" so it matches the MXAccess ref the
+        // Galaxy driver subscribes to. Browse-path lookup via OPC UA Translate is the canonical
+        // resolution; flat NodeId keeps the address space lookup cheap.
+        foreach (var tag in composition.GalaxyTags)
+        {
+            var nodeId = string.IsNullOrWhiteSpace(tag.FolderPath) ? tag.DisplayName : tag.MxAccessRef;
+            var parent = string.IsNullOrWhiteSpace(tag.FolderPath) ? null : tag.FolderPath;
+            SafeEnsureVariable(nodeId, parent, tag.DisplayName, tag.DataType);
+        }
+
+        _logger.LogInformation(
+            "Phase7Applier: Galaxy tags materialised (tags={Tags}, folders={Folders})",
+            composition.GalaxyTags.Count, foldersCreated.Count);
+    }
+
     private void SafeEnsureFolder(string nodeId, string? parentNodeId, string displayName)
     {
         try { _sink.EnsureFolder(nodeId, parentNodeId, displayName); }
         catch (Exception ex) { _logger.LogWarning(ex, "Phase7Applier: EnsureFolder threw for {Node}", nodeId); }
     }
 
+    private void SafeEnsureVariable(string nodeId, string? parentNodeId, string displayName, string dataType)
+    {
+        try { _sink.EnsureVariable(nodeId, parentNodeId, displayName, dataType); }
+        catch (Exception ex) { _logger.LogWarning(ex, "Phase7Applier: EnsureVariable threw for {Node}", nodeId); }
+    }
+
     private void SafeWriteAlarmState(string nodeId, bool active, bool acknowledged, DateTime ts)
     {
         try { _sink.WriteAlarmState(nodeId, active, acknowledged, ts); }

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Phase7Composer.cs

@@ -1,25 +1,40 @@
 using ZB.MOM.WW.OtOpcUa.Configuration.Entities;
+using ZB.MOM.WW.OtOpcUa.Configuration.Enums;
 
 namespace ZB.MOM.WW.OtOpcUa.OpcUaServer;
 
 /// <summary>Outcome of <see cref="Phase7Composer.Compose"/> — pure value tuple, no side effects.
 /// <see cref="UnsAreas"/> + <see cref="UnsLines"/> carry the UNS topology so the applier can
 /// materialise the Area/Line/Equipment folder hierarchy in the address space; equipment carries
-/// its parent line id so the applier knows where to hang each equipment folder.</summary>
+/// its parent line id so the applier knows where to hang each equipment folder.
+/// <see cref="GalaxyTags"/> carries SystemPlatform-namespace tags (Galaxy hierarchy) so the
+/// applier can materialise their FolderPath + Variable nodes ahead of any driver subscribe.</summary>
 public sealed record Phase7CompositionResult(
     IReadOnlyList<UnsAreaProjection> UnsAreas,
     IReadOnlyList<UnsLineProjection> UnsLines,
     IReadOnlyList<EquipmentNode> EquipmentNodes,
     IReadOnlyList<DriverInstancePlan> DriverInstancePlans,
-    IReadOnlyList<ScriptedAlarmPlan> ScriptedAlarmPlans)
+    IReadOnlyList<ScriptedAlarmPlan> ScriptedAlarmPlans,
+    IReadOnlyList<GalaxyTagPlan> GalaxyTags)
 {
-    /// <summary>Convenience constructor for tests + earlier callers that don't yet carry UNS topology.</summary>
+    /// <summary>Convenience constructor for tests + earlier callers that don't carry UNS or Galaxy data.</summary>
     public Phase7CompositionResult(
         IReadOnlyList<EquipmentNode> equipmentNodes,
         IReadOnlyList<DriverInstancePlan> driverInstancePlans,
         IReadOnlyList<ScriptedAlarmPlan> scriptedAlarmPlans)
         : this(Array.Empty<UnsAreaProjection>(), Array.Empty<UnsLineProjection>(),
-               equipmentNodes, driverInstancePlans, scriptedAlarmPlans)
+               equipmentNodes, driverInstancePlans, scriptedAlarmPlans, Array.Empty<GalaxyTagPlan>())
+    {
+    }
+
+    /// <summary>Convenience constructor for callers carrying UNS but not Galaxy data.</summary>
+    public Phase7CompositionResult(
+        IReadOnlyList<UnsAreaProjection> unsAreas,
+        IReadOnlyList<UnsLineProjection> unsLines,
+        IReadOnlyList<EquipmentNode> equipmentNodes,
+        IReadOnlyList<DriverInstancePlan> driverInstancePlans,
+        IReadOnlyList<ScriptedAlarmPlan> scriptedAlarmPlans)
+        : this(unsAreas, unsLines, equipmentNodes, driverInstancePlans, scriptedAlarmPlans, Array.Empty<GalaxyTagPlan>())
     {
     }
 }
@@ -30,6 +45,21 @@ public sealed record EquipmentNode(string EquipmentId, string DisplayName, strin
 public sealed record DriverInstancePlan(string DriverInstanceId, string DriverType, string ConfigJson);
 public sealed record ScriptedAlarmPlan(string ScriptedAlarmId, string EquipmentId, string PredicateScriptId, string MessageTemplate);
 
+/// <summary>
+///     One Galaxy / SystemPlatform-namespace tag from a <see cref="Tag"/> row where
+///     <see cref="Tag.EquipmentId"/> is null. Carries the FolderPath segment that the applier
+///     turns into a folder, the leaf <see cref="DisplayName"/> for the Variable, the OPC UA
+///     <see cref="DataType"/>, and the dot-form MXAccess reference (<see cref="MxAccessRef"/>)
+///     that the Galaxy driver consumes when subscribing.
+/// </summary>
+public sealed record GalaxyTagPlan(
+    string TagId,
+    string DriverInstanceId,
+    string FolderPath,
+    string DisplayName,
+    string DataType,
+    string MxAccessRef);
+
 /// <summary>
 /// Pure composer that flattens the live-edit DB tables into the address-space build plan a
 /// driver-role host needs. Same inputs → same outputs, no logging, no DB writes. The driver-role
@@ -43,19 +73,32 @@ public sealed record ScriptedAlarmPlan(string ScriptedAlarmId, string EquipmentI
 /// </summary>
 public static class Phase7Composer
 {
-    /// <summary>Convenience overload for legacy callers + tests that don't yet supply UNS topology.</summary>
+    /// <summary>Convenience overload for legacy callers + tests that don't yet supply UNS / Galaxy data.</summary>
     public static Phase7CompositionResult Compose(
         IReadOnlyList<Equipment> equipment,
         IReadOnlyList<DriverInstance> driverInstances,
         IReadOnlyList<ScriptedAlarm> scriptedAlarms) =>
-        Compose(Array.Empty<UnsArea>(), Array.Empty<UnsLine>(), equipment, driverInstances, scriptedAlarms);
+        Compose(Array.Empty<UnsArea>(), Array.Empty<UnsLine>(), equipment, driverInstances, scriptedAlarms,
+                Array.Empty<Tag>(), Array.Empty<Namespace>());
+
+    /// <summary>UNS-aware overload that doesn't yet supply Galaxy tags.</summary>
+    public static Phase7CompositionResult Compose(
+        IReadOnlyList<UnsArea> unsAreas,
+        IReadOnlyList<UnsLine> unsLines,
+        IReadOnlyList<Equipment> equipment,
+        IReadOnlyList<DriverInstance> driverInstances,
+        IReadOnlyList<ScriptedAlarm> scriptedAlarms) =>
+        Compose(unsAreas, unsLines, equipment, driverInstances, scriptedAlarms,
+                Array.Empty<Tag>(), Array.Empty<Namespace>());
 
     public static Phase7CompositionResult Compose(
         IReadOnlyList<UnsArea> unsAreas,
         IReadOnlyList<UnsLine> unsLines,
         IReadOnlyList<Equipment> equipment,
         IReadOnlyList<DriverInstance> driverInstances,
-        IReadOnlyList<ScriptedAlarm> scriptedAlarms)
+        IReadOnlyList<ScriptedAlarm> scriptedAlarms,
+        IReadOnlyList<Tag> tags,
+        IReadOnlyList<Namespace> namespaces)
     {
         var areas = unsAreas
             .OrderBy(a => a.UnsAreaId, StringComparer.Ordinal)
@@ -82,6 +125,30 @@ public static class Phase7Composer
             .Select(a => new ScriptedAlarmPlan(a.ScriptedAlarmId, a.EquipmentId, a.PredicateScriptId, a.MessageTemplate))
             .ToList();
 
-        return new Phase7CompositionResult(areas, lines, nodes, plans, alarms);
+        // SystemPlatform tags = Galaxy tags. Match each tag to its DriverInstance and that
+        // driver's Namespace; emit only when the namespace kind is SystemPlatform AND the tag
+        // has no EquipmentId (per the entity invariant for SystemPlatform).
+        var driversById = driverInstances.ToDictionary(d => d.DriverInstanceId, StringComparer.Ordinal);
+        var namespacesById = namespaces.ToDictionary(n => n.NamespaceId, StringComparer.Ordinal);
+
+        var galaxyTags = tags
+            .Where(t => t.EquipmentId is null)
+            .Where(t => driversById.TryGetValue(t.DriverInstanceId, out var di)
+                        && namespacesById.TryGetValue(di.NamespaceId, out var ns)
+                        && ns.Kind == NamespaceKind.SystemPlatform)
+            .OrderBy(t => t.DriverInstanceId, StringComparer.Ordinal)
+            .ThenBy(t => t.FolderPath, StringComparer.Ordinal)
+            .ThenBy(t => t.Name, StringComparer.Ordinal)
+            .Select(t => new GalaxyTagPlan(
+                TagId: t.TagId,
+                DriverInstanceId: t.DriverInstanceId,
+                FolderPath: t.FolderPath ?? string.Empty,
+                DisplayName: t.Name,
+                DataType: t.DataType,
+                // MXAccess reference: "FolderPath.Name" when FolderPath is set, else just "Name".
+                MxAccessRef: string.IsNullOrWhiteSpace(t.FolderPath) ? t.Name : $"{t.FolderPath}.{t.Name}"))
+            .ToList();
+
+        return new Phase7CompositionResult(areas, lines, nodes, plans, alarms, galaxyTags);
     }
 }

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Phase7Plan.cs

@@ -21,16 +21,21 @@ public sealed record Phase7Plan(
     IReadOnlyList<Phase7Plan.DriverDelta> ChangedDrivers,
     IReadOnlyList<ScriptedAlarmPlan> AddedAlarms,
     IReadOnlyList<ScriptedAlarmPlan> RemovedAlarms,
-    IReadOnlyList<Phase7Plan.AlarmDelta> ChangedAlarms)
+    IReadOnlyList<Phase7Plan.AlarmDelta> ChangedAlarms,
+    IReadOnlyList<GalaxyTagPlan> AddedGalaxyTags,
+    IReadOnlyList<GalaxyTagPlan> RemovedGalaxyTags,
+    IReadOnlyList<Phase7Plan.GalaxyTagDelta> ChangedGalaxyTags)
 {
     public bool IsEmpty =>
         AddedEquipment.Count == 0 && RemovedEquipment.Count == 0 && ChangedEquipment.Count == 0 &&
         AddedDrivers.Count == 0 && RemovedDrivers.Count == 0 && ChangedDrivers.Count == 0 &&
-        AddedAlarms.Count == 0 && RemovedAlarms.Count == 0 && ChangedAlarms.Count == 0;
+        AddedAlarms.Count == 0 && RemovedAlarms.Count == 0 && ChangedAlarms.Count == 0 &&
+        AddedGalaxyTags.Count == 0 && RemovedGalaxyTags.Count == 0 && ChangedGalaxyTags.Count == 0;
 
     public sealed record EquipmentDelta(EquipmentNode Previous, EquipmentNode Current);
     public sealed record DriverDelta(DriverInstancePlan Previous, DriverInstancePlan Current);
     public sealed record AlarmDelta(ScriptedAlarmPlan Previous, ScriptedAlarmPlan Current);
+    public sealed record GalaxyTagDelta(GalaxyTagPlan Previous, GalaxyTagPlan Current);
 }
 
 public static class Phase7Planner
@@ -61,10 +66,16 @@ public static class Phase7Planner
             a => a.ScriptedAlarmId,
             (a, b) => new Phase7Plan.AlarmDelta(a, b));
 
+        var (addedGalaxy, removedGalaxy, changedGalaxy) = DiffById(
+            previous.GalaxyTags, next.GalaxyTags,
+            t => t.TagId,
+            (a, b) => new Phase7Plan.GalaxyTagDelta(a, b));
+
         return new Phase7Plan(
             addedEq, removedEq, changedEq,
             addedDrv, removedDrv, changedDrv,
-            addedAlarm, removedAlarm, changedAlarm);
+            addedAlarm, removedAlarm, changedAlarm,
+            addedGalaxy, removedGalaxy, changedGalaxy);
     }
 
     private static (IReadOnlyList<T> Added, IReadOnlyList<T> Removed, IReadOnlyList<TDelta> Changed)

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/SdkAddressSpaceSink.cs

@@ -27,5 +27,8 @@ public sealed class SdkAddressSpaceSink : IOpcUaAddressSpaceSink
     public void EnsureFolder(string folderNodeId, string? parentNodeId, string displayName)
         => _nodeManager.EnsureFolder(folderNodeId, parentNodeId, displayName);
 
+    public void EnsureVariable(string variableNodeId, string? parentFolderNodeId, string displayName, string dataType)
+        => _nodeManager.EnsureVariable(variableNodeId, parentFolderNodeId, displayName, dataType);
+
     public void RebuildAddressSpace() => _nodeManager.RebuildAddressSpace();
 }

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Drivers/DeploymentArtifact.cs

@@ -101,8 +101,9 @@ public static class DeploymentArtifact
             var equipment = ReadArray(root, "Equipment", ReadEquipmentNode);
             var drivers = ReadArray(root, "DriverInstances", ReadDriverPlan);
             var alarms = ReadArray(root, "ScriptedAlarms", ReadAlarmPlan);
+            var galaxyTags = BuildGalaxyTagPlans(root, drivers);
 
-            return new Phase7CompositionResult(areas, lines, equipment, drivers, alarms);
+            return new Phase7CompositionResult(areas, lines, equipment, drivers, alarms, galaxyTags);
         }
         catch (JsonException)
         {
@@ -115,7 +116,87 @@ public static class DeploymentArtifact
         Array.Empty<UnsLineProjection>(),
         Array.Empty<EquipmentNode>(),
         Array.Empty<DriverInstancePlan>(),
-        Array.Empty<ScriptedAlarmPlan>());
+        Array.Empty<ScriptedAlarmPlan>(),
+        Array.Empty<GalaxyTagPlan>());
+
+    /// <summary>
+    ///     Cross-reference the artifact's Tags + Namespaces + DriverInstances arrays to find
+    ///     SystemPlatform-namespace tags (Galaxy hierarchy), then emit one <see cref="GalaxyTagPlan"/>
+    ///     per qualifying tag. Mirrors <c>Phase7Composer.Compose</c>'s filter so a compose-side
+    ///     plan and an artifact-decode plan agree on the same set of tags.
+    /// </summary>
+    private static IReadOnlyList<GalaxyTagPlan> BuildGalaxyTagPlans(JsonElement root, IReadOnlyList<DriverInstancePlan> drivers)
+    {
+        if (!root.TryGetProperty("Tags", out var tagsArr) || tagsArr.ValueKind != JsonValueKind.Array)
+            return Array.Empty<GalaxyTagPlan>();
+        if (!root.TryGetProperty("Namespaces", out var nsArr) || nsArr.ValueKind != JsonValueKind.Array)
+            return Array.Empty<GalaxyTagPlan>();
+        if (!root.TryGetProperty("DriverInstances", out var diArr) || diArr.ValueKind != JsonValueKind.Array)
+            return Array.Empty<GalaxyTagPlan>();
+
+        // namespaceId → Kind ("SystemPlatform"/"Equipment"/"Simulated") — enum serialises as int by default,
+        // but ConfigComposer's snapshot uses default JsonSerializer which writes numbers. Tolerate both.
+        var systemPlatformNamespaces = new HashSet<string>(StringComparer.Ordinal);
+        foreach (var el in nsArr.EnumerateArray())
+        {
+            if (el.ValueKind != JsonValueKind.Object) continue;
+            var id = el.TryGetProperty("NamespaceId", out var idEl) ? idEl.GetString() : null;
+            if (string.IsNullOrWhiteSpace(id)) continue;
+            if (!el.TryGetProperty("Kind", out var kindEl)) continue;
+            var isSystemPlatform = kindEl.ValueKind switch
+            {
+                JsonValueKind.Number => kindEl.GetInt32() == 1, // NamespaceKind.SystemPlatform = 1
+                JsonValueKind.String => string.Equals(kindEl.GetString(), "SystemPlatform", StringComparison.Ordinal),
+                _ => false,
+            };
+            if (isSystemPlatform) systemPlatformNamespaces.Add(id!);
+        }
+
+        // driverInstanceId → namespaceId
+        var driverToNamespace = new Dictionary<string, string>(StringComparer.Ordinal);
+        foreach (var el in diArr.EnumerateArray())
+        {
+            if (el.ValueKind != JsonValueKind.Object) continue;
+            var id = el.TryGetProperty("DriverInstanceId", out var idEl) ? idEl.GetString() : null;
+            var ns = el.TryGetProperty("NamespaceId", out var nsEl) ? nsEl.GetString() : null;
+            if (!string.IsNullOrWhiteSpace(id) && !string.IsNullOrWhiteSpace(ns))
+                driverToNamespace[id!] = ns!;
+        }
+
+        var result = new List<GalaxyTagPlan>(tagsArr.GetArrayLength());
+        foreach (var el in tagsArr.EnumerateArray())
+        {
+            if (el.ValueKind != JsonValueKind.Object) continue;
+            // Skip tags with non-null EquipmentId (Equipment-namespace tags belong to a different path).
+            if (el.TryGetProperty("EquipmentId", out var eqEl) && eqEl.ValueKind != JsonValueKind.Null) continue;
+
+            var tagId = el.TryGetProperty("TagId", out var tEl) ? tEl.GetString() : null;
+            var di = el.TryGetProperty("DriverInstanceId", out var diEl) ? diEl.GetString() : null;
+            var name = el.TryGetProperty("Name", out var nmEl) ? nmEl.GetString() : null;
+            var folder = el.TryGetProperty("FolderPath", out var fpEl) && fpEl.ValueKind != JsonValueKind.Null
+                ? fpEl.GetString() : null;
+            var dataType = el.TryGetProperty("DataType", out var dtEl) ? dtEl.GetString() : null;
+
+            if (string.IsNullOrWhiteSpace(tagId) || string.IsNullOrWhiteSpace(di) || string.IsNullOrWhiteSpace(name))
+                continue;
+            if (!driverToNamespace.TryGetValue(di!, out var nsId)) continue;
+            if (!systemPlatformNamespaces.Contains(nsId)) continue;
+
+            var folderPath = folder ?? string.Empty;
+            var mxRef = string.IsNullOrWhiteSpace(folderPath) ? name! : $"{folderPath}.{name}";
+            result.Add(new GalaxyTagPlan(tagId!, di!, folderPath, name!, dataType ?? "BaseDataType", mxRef));
+        }
+
+        result.Sort((a, b) =>
+        {
+            var byDriver = string.CompareOrdinal(a.DriverInstanceId, b.DriverInstanceId);
+            if (byDriver != 0) return byDriver;
+            var byFolder = string.CompareOrdinal(a.FolderPath, b.FolderPath);
+            if (byFolder != 0) return byFolder;
+            return string.CompareOrdinal(a.DisplayName, b.DisplayName);
+        });
+        return result;
+    }
 
     private static IReadOnlyList<T> ReadArray<T>(JsonElement root, string propertyName, Func<JsonElement, T?> reader)
         where T : class

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Drivers/DriverInstanceActor.cs

@@ -66,9 +66,15 @@ public sealed class DriverInstanceActor : ReceiveActor, IWithTimers
 
     /// <summary>
     /// Returns true when the driver should boot in DEV-STUB mode based on host platform and
-    /// configured roles. Mirrors plan §Task 55: Windows-only driver types (Galaxy, Wonderware
-    /// Historian) are stubbed when running on non-Windows OR when the host carries the
-    /// <c>dev</c> role.
+    /// configured roles. Only the v1 in-process types stay Windows-only:
+    /// <list type="bullet">
+    ///   <item><c>"Galaxy"</c> — legacy MXAccess COM proxy (retired in PR 7.2; gated for any
+    ///         leftover DriverInstance rows that still reference the old type name).</item>
+    ///   <item><c>"Historian.Wonderware"</c> — Wonderware Historian sidecar over Windows-only
+    ///         named pipes.</item>
+    /// </list>
+    /// The v2 <c>"GalaxyMxGateway"</c> driver talks gRPC to an external mxaccessgw process,
+    /// so it runs on any platform .NET 10 supports — Linux containers included. Not stubbed.
     /// </summary>
     public static bool ShouldStub(string driverType, IEnumerable<string> roles)
     {

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/OpcUa/OpcUaPublishActor.cs

@@ -45,9 +45,12 @@ public sealed class OpcUaPublishActor : ReceiveActor
     private int _writes;
     private byte _lastServiceLevel;
     private Phase7CompositionResult _lastApplied = new(
+        Array.Empty<UnsAreaProjection>(),
+        Array.Empty<UnsLineProjection>(),
         Array.Empty<EquipmentNode>(),
         Array.Empty<DriverInstancePlan>(),
-        Array.Empty<ScriptedAlarmPlan>());
+        Array.Empty<ScriptedAlarmPlan>(),
+        Array.Empty<GalaxyTagPlan>());
 
     public int WriteCount => _writes;
     public byte LastServiceLevel => _lastServiceLevel;
@@ -190,6 +193,10 @@ public sealed class OpcUaPublishActor : ReceiveActor
             // clients see Area/Line/Equipment as proper folders. Idempotent; Phase7Applier
             // skips folders that already exist with the same node id.
             _applier.MaterialiseHierarchy(composition);
+            // Galaxy / SystemPlatform tags get their own pass: ensures their FolderPath folder
+            // + Variable node exist so clients can browse them. The Galaxy driver fills values
+            // on a future SubscribeBulk pass; until then variables show BadWaitingForInitialData.
+            _applier.MaterialiseGalaxyTags(composition);
 
             OtOpcUaTelemetry.OpcUaSinkWrite.Add(1, new KeyValuePair<string, object?>("kind", "rebuild"));
             _log.Info("OpcUaPublish: applied rebuild (correlation={Correlation}, added={Added}, removed={Removed}, changed={Changed}, rebuild={Rebuild})",

src/Server/ZB.MOM.WW.OtOpcUa.Security/Endpoints/AuthEndpoints.cs

@@ -115,6 +115,13 @@ public static class AuthEndpoints
     private static async Task<IResult> LogoutAsync(HttpContext http)
     {
         await http.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
-        return Results.NoContent();
+
+        // Browser form POST → redirect to /login so the user lands somewhere visible.
+        // API callers that prefer the status-only contract should hit the endpoint with
+        // Accept: application/json and we'll hand them a 204 instead.
+        var wantsJson = http.Request.Headers.Accept.Any(v =>
+            v?.Contains("application/json", StringComparison.OrdinalIgnoreCase) == true);
+        if (wantsJson) return Results.NoContent();
+        return Results.Redirect("/login");
     }
 }