Drupal-Debug-Hints.md

@@ -72,6 +72,24 @@ You might also have to delete some config files the module comes with if you wan
 drush config-delete module_name.settings_name
 ```
 
+# Remove Module Config
+
+Sometimes `update.php` says:
+
+```
+    Module my_already_removed_module has a schema in the key_value store, but is missing from your site.
+    Module update_test_0 has a schema in the key_value store, but is not installed. 
+```
+
+As per [Drupal Doc](https://www.drupal.org/node/3137656), to fix this without reinstalling, you can run:
+
+```
+drush php-eval "\Drupal::keyValue('system.schema')->delete('my_already_removed_module');"
+drush php-eval "\Drupal::keyValue('system.schema')->delete('update_test_0');"
+```
+
+Alternatively, you can also install the module again, deactivate and uninstall it, and then remove the files. 
+
 # Fix Revision ID Field needs to be installed
 ```php
 drush eval "\$edum = \\Drupal::entityDefinitionUpdateManager(); \$fs = \\Drupal::service('entity_field.manager')->getFieldStorageDefinitions('wisski_individual');\$edum->updateFieldableEntityType(\Drupal::entityTypeManager()->getDefinition('wisski_individual'), \$fs);"