diff --git a/api/tests/Feature/Person/PersonSoftDeleteTest.php b/api/tests/Feature/Person/PersonSoftDeleteTest.php
new file mode 100644
index 00000000..019a828e
--- /dev/null
+++ b/api/tests/Feature/Person/PersonSoftDeleteTest.php
@@ -0,0 +1,100 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature\Person;
+
+use App\Models\CrowdType;
+use App\Models\Event;
+use App\Models\Organisation;
+use App\Models\Person;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+/**
+ * WS-4 Commit 4 — WS-1 finding D-05 verification.
+ *
+ * SCHEMA.md §3.5.11 Rule 3 lists `persons` under "Soft delete YES".
+ * This test pins the documented behaviour — delete/restore/forceDelete,
+ * withTrashed and onlyTrashed visibility — so the ARTIST_ADVANCE and
+ * EVENT_REGISTRATION workflows (WS-6) can rely on it without a second
+ * verification pass.
+ *
+ * Pre-flight found the implementation already in place
+ * (2026_04_08_220000_create_persons_table.php line 27 has
+ * `$table->softDeletes()`; `app/Models/Person.php` lines 18 + 24 carry
+ * the `SoftDeletes` trait). No code change required — this file is the
+ * behavioural contract.
+ */
+final class PersonSoftDeleteTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private Person $person;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $organisation = Organisation::factory()->create();
+        $event = Event::factory()->for($organisation)->create();
+        $crowdType = CrowdType::factory()->for($organisation)->create();
+
+        $this->person = Person::factory()
+            ->for($event)
+            ->for($crowdType)
+            ->create();
+    }
+
+    public function test_delete_sets_deleted_at_and_hides_row_from_default_queries(): void
+    {
+        $id = $this->person->id;
+
+        $this->person->delete();
+
+        $this->assertNotNull($this->person->fresh()?->deleted_at);
+        $this->assertNull(
+            Person::query()->find($id),
+            'Soft-deleted person must not appear in default queries'
+        );
+    }
+
+    public function test_with_trashed_returns_deleted_row(): void
+    {
+        $id = $this->person->id;
+        $this->person->delete();
+
+        $trashed = Person::withTrashed()->find($id);
+
+        $this->assertNotNull($trashed);
+        $this->assertSame($id, $trashed->id);
+    }
+
+    public function test_only_trashed_counts_soft_deleted_rows(): void
+    {
+        $this->assertSame(0, Person::onlyTrashed()->count());
+
+        $this->person->delete();
+
+        $this->assertSame(1, Person::onlyTrashed()->count());
+    }
+
+    public function test_restore_clears_deleted_at(): void
+    {
+        $this->person->delete();
+        $this->assertNotNull($this->person->fresh()?->deleted_at);
+
+        $this->person->restore();
+
+        $this->assertNull($this->person->fresh()?->deleted_at);
+        $this->assertNotNull(Person::query()->find($this->person->id));
+    }
+
+    public function test_force_delete_removes_row_permanently(): void
+    {
+        $id = $this->person->id;
+        $this->person->forceDelete();
+
+        $this->assertNull(Person::withTrashed()->find($id));
+    }
+}
diff --git a/dev-docs/BACKLOG.md b/dev-docs/BACKLOG.md
index 4dae1366..ab9b2132 100644
--- a/dev-docs/BACKLOG.md
+++ b/dev-docs/BACKLOG.md
@@ -373,6 +373,19 @@ form-builder UI), omdat screenshots pas zin hebben als de UI staat.
 
 ---
 
+### DOC-04 — `scripts/install-claude-sync-hooks.sh` opnemen in SETUP/onboarding
+
+**Aanleiding:** WS-4 pre-flight audit vond dat `scripts/sync-claude-docs.sh`
+bestaat en door de post-commit hook draait, maar de hook-installer
+(`scripts/install-claude-sync-hooks.sh`) is niet terug te vinden in de
+developer onboarding-instructies. Nieuwe clones missen de hook.
+**Wat:** Voeg een regel aan `dev-docs/SETUP.md` (of een post-install
+checklist) toe die nieuwe developers opdraagt `install-claude-sync-hooks.sh`
+te runnen. 1 regel, geen scope-impact.
+**Prioriteit:** Laag — nice-to-have, niet blokkerend voor dev of CI.
+
+---
+
 ### FORM-05 — Smart identity-match on public submission values
 
 **Stub-status (S3a PR 2, 2026-04-23):** Public event_registration