Add administration specific thing to preferences.

database/migrations/2024_04_01_174351_expand_preferences_table.php

@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\QueryException;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        try {
+            Schema::table(
+                'preferences',
+                static function (Blueprint $table): void {
+                    if (!Schema::hasColumn('preferences', 'user_group_id')) {
+                        $table->bigInteger('user_group_id', false, true)->nullable()->after('user_id');
+                        $table->foreign('user_group_id', 'preferences_to_ugi')->references('id')->on('user_groups')->onDelete('set null')->onUpdate('cascade');
+                    }
+                }
+            );
+        } catch (QueryException $e) {
+            app('log')->error(sprintf('Could not execute query: %s', $e->getMessage()));
+            app('log')->error('If the column or index already exists (see error), this is not an problem. Otherwise, please open a GitHub discussion.');
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        //
+    }
+};