improvement: Add link to duplicate domain

fix: duplicate domain error
fix: remove fqdn constraint from db, because it is checked on app level

database/migrations/2024_10_10_081444_remove_constraint_from_service_applications_fqdn.php

@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('service_applications', function (Blueprint $table) {
+            $table->dropUnique(['fqdn']);
+        });
+        Schema::table('applications', function (Blueprint $table) {
+            $table->dropUnique(['fqdn']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('service_applications', function (Blueprint $table) {
+            $table->unique('fqdn');
+        });
+        Schema::table('applications', function (Blueprint $table) {
+            $table->unique('fqdn');
+        });
+    }
+};