Fix Server issue

app/src/Lib/Traits/PluggableModelTrait.php

@@ -197,15 +197,35 @@ protected function setPluginRelations() {
         continue;
       }
 
+      // Derive association alias from "Plugin.Model"
+      [$pluginName, $modelAlias] = explode('.', $m->plugin, 2);
+
+      // Skip if alias would clash with this table alias or already exists
+      if ($modelAlias === $this->getAlias()) {
+        // Avoid "Association alias 'X' is already set."
+        $this->llog('debug', "Skipping association for plugin '{$m->plugin}' due to alias clash with table alias '{$this->getAlias()}'");
+        continue;
+      }
+
+      if ($this->associations()->has($modelAlias)) {
+        // Association already defined elsewhere; don't rebind
+        $this->llog('debug', "Association '{$modelAlias}' already exists, skipping plugin relation '{$m->plugin}'");
+        continue;
+      }
+
       // In general, a model with a "plugin" field has a 1-1 relation
       // with the instantiated plugin configuration. eg: One instance
       // of a Server has exactly one SqlServer associated with it.
-      $this->hasOne($m->plugin)
-           ->setDependent(true)
-           ->setCascadeCallbacks(true);
-
-      // Cache the list of entry points that we found
-      $this->_pluginModels[] = $m->plugin;
+      // Bind by alias and explicitly set the className.
+      $this->hasOne($modelAlias)
+        ->setClassName($m->plugin)
+        ->setDependent(true)
+        ->setCascadeCallbacks(true);
+
+      // Cache the list of entry points that we found (avoid duplicates)
+      if (!in_array($m->plugin, $this->_pluginModels, true)) {
+        $this->_pluginModels[] = $m->plugin;
+      }
     }
 
     // isArtifactTable() might not be the exact right test here...

app/src/Model/Table/ServersTable.php

@@ -72,10 +72,7 @@ public function initialize(array $config): void {
     $this->hasMany('Pipelines')
          ->setForeignKey('match_server_id');
 
-// XXX Note this will bind to (eg) CoreServer but not (eg) SqlProvisioner
-// As of Cake 5 this is causing errors with the Servers alias already being set,
-// it's not clear that we need this anymore?
-    // $this->setPluginRelations();
+     $this->setPluginRelations();
 
     $this->setDisplayField('description');