Added better constraints checks with more to follow.

config/backend.spec.php

@@ -1,37 +0,0 @@
-<?php
-
-/**
- * Last update: 2024-04-26
- *
- * servers.yaml backend spec.
- * This file defines the backend spec.
- * The dot (.) notation means the key is subarray of the parent key.
- * the boolean at the end of the key means if the key should be visible in the config:edit/view command.
- */
-return [
-    'name' => true,
-    'type' => true,
-    'url' => true,
-    'token' => true,
-    'uuid' => true,
-    'user' => true,
-    'export.enabled' => true,
-    'export.lastSync' => true,
-    'import.enabled' => true,
-    'import.lastSync' => true,
-    'webhook.token' => true,
-    'webhook.match.user' => true,
-    'webhook.match.uuid' => true,
-    'options.ignore' => true,
-    'options.LIBRARY_SEGMENT' => true,
-    'options.ADMIN_TOKEN' => false,
-    'options.DUMP_PAYLOAD' => false,
-    'options.DEBUG_TRACE' => false,
-    'options.IMPORT_METADATA_ONLY' => false,
-    'options.DRY_RUN' => false,
-    'options.client.timeout' => false,
-    'options.client.http_version' => false,
-    'options.use_old_progress_endpoint' => false,
-    'options.MAX_EPISODE_RANGE' => false,
-];
-

config/servers.spec.php

@@ -1,7 +1,7 @@
 <?php
 
 /**
- * Last update: 2024-05-14
+ * Last update: 2024-05-17
  *
  * servers.yaml backend spec.
  *
@@ -14,13 +14,15 @@ return [
         'type' => 'string',
         'visible' => true,
         'description' => 'The name of the backend.',
+        'immutable' => true,
     ],
     [
         'key' => 'type',
         'type' => 'string',
         'visible' => true,
         'description' => 'The type of the backend.',
-        'choices' => ['plex', 'emby', 'jellyfin']
+        'choices' => ['plex', 'emby', 'jellyfin'],
+        'immutable' => true,
     ],
     [
         'key' => 'url',
@@ -54,7 +56,7 @@ return [
     ],
     [
         'key' => 'export.lastSync',
-        'type' => 'integer',
+        'type' => 'int',
         'visible' => true,
         'description' => 'The last time data was exported to the backend.',
     ],
@@ -66,7 +68,7 @@ return [
     ],
     [
         'key' => 'import.lastSync',
-        'type' => 'integer',
+        'type' => 'int',
         'visible' => true,
         'description' => 'The last time data was imported from the backend.',
     ],
@@ -139,7 +141,7 @@ return [
     ],
     [
         'key' => 'options.client.timeout',
-        'type' => 'integer',
+        'type' => 'int',
         'visible' => false,
         'description' => 'The http timeout per request to the backend.',
     ],