fix: backfill datacenters on migrate; resolve billing customer by user link

- migration seeds fsn/hel + any host-referenced code so existing installs
  keep selectable datacenters after upgrade
- Billing::customer() resolves via user_id, email only as legacy fallback

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Livewire/Billing.php

@@ -65,8 +65,13 @@ class Billing extends Component
     private function customer(): ?Customer
     {
         $user = auth()->user();
+        if (! $user) {
+            return null;
+        }
 
-        return $user ? Customer::query()->where('email', $user->email)->first() : null;
+        // Prefer the explicit link; fall back to email for legacy unlinked accounts.
+        return Customer::query()->where('user_id', $user->id)->first()
+            ?? Customer::query()->where('email', $user->email)->first();
     }
 
     public function render()

database/migrations/2026_07_25_090001_create_datacenters_table.php

@@ -2,7 +2,9 @@
 
 use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Schema;
+use Illuminate\Support\Str;
 
 return new class extends Migration
 {
@@ -17,6 +19,33 @@ return new class extends Migration
             $table->boolean('active')->default(true);
             $table->timestamps();
         });
+
+        // The host form now only offers codes from this table, so an existing
+        // install must not upgrade into an empty list. Backfill every code
+        // already referenced by a host, plus the previously hardcoded defaults.
+        $names = ['fsn' => 'Falkenstein', 'hel' => 'Helsinki'];
+        $locations = ['fsn' => 'DE', 'hel' => 'FI'];
+
+        $codes = ['fsn', 'hel'];
+        if (Schema::hasTable('hosts')) {
+            $codes = array_values(array_unique(array_merge(
+                $codes,
+                DB::table('hosts')->whereNotNull('datacenter')->distinct()->pluck('datacenter')->all(),
+            )));
+        }
+
+        $now = now();
+        foreach ($codes as $code) {
+            DB::table('datacenters')->insert([
+                'uuid' => (string) Str::uuid(),
+                'code' => $code,
+                'name' => $names[$code] ?? Str::upper($code),
+                'location' => $locations[$code] ?? null,
+                'active' => true,
+                'created_at' => $now,
+                'updated_at' => $now,
+            ]);
+        }
     }
 
     public function down(): void

tests/Feature/Admin/DatacenterTest.php

@@ -27,7 +27,7 @@ it('creates a datacenter', function () {
 });
 
 it('rejects a duplicate datacenter code', function () {
-    Datacenter::factory()->create(['code' => 'fsn']);
+    Datacenter::query()->firstOrCreate(['code' => 'fsn'], ['name' => 'Falkenstein']);
 
     Livewire::actingAs(admin())
         ->test(Datacenters::class)
@@ -45,7 +45,7 @@ it('toggles a datacenter active flag', function () {
 });
 
 it('offers only known datacenter codes when adding a host', function () {
-    Datacenter::factory()->create(['code' => 'fsn', 'name' => 'Falkenstein']);
+    Datacenter::query()->firstOrCreate(['code' => 'fsn'], ['name' => 'Falkenstein']);
 
     // unknown code rejected
     Livewire::actingAs(admin())

tests/Feature/Admin/HostManagementTest.php

@@ -39,7 +39,7 @@ it('lists real hosts for admins', function () {
 
 it('creates a host and starts onboarding with an encrypted password', function () {
     Queue::fake();
-    \App\Models\Datacenter::factory()->create(['code' => 'fsn']);
+    \App\Models\Datacenter::query()->firstOrCreate(['code' => 'fsn'], ['name' => 'Falkenstein']);
 
     Livewire::actingAs(admin())
         ->test(HostCreate::class)
@@ -62,7 +62,7 @@ it('creates a host and starts onboarding with an encrypted password', function (
 });
 
 it('rejects a duplicate public ip', function () {
-    \App\Models\Datacenter::factory()->create(['code' => 'fsn']);
+    \App\Models\Datacenter::query()->firstOrCreate(['code' => 'fsn'], ['name' => 'Falkenstein']);
     Host::factory()->create(['public_ip' => '203.0.113.99']);
 
     Livewire::actingAs(admin())