diff --git a/README.md b/README.md
index 24023fa..0cc384e 100644
--- a/README.md
+++ b/README.md
@@ -331,3 +331,11 @@ eigene Datensätze erhalten (Migration 0011).
 Vor dem Update einer bestehenden Installation eine Datenbanksicherung
 erstellen, dann `python manage.py migrate` ausführen. Ein Löschen der
 Datenbank ist nicht nötig und würde Geräte und Benutzerkonten entfernen.
+
+## USB AIO station API
+
+The USB station resolves hardware identity with `POST /api/v1/devices/resolve/`, then reads the returned inventory number, workflow `stage`, and status. For `INTAKE` devices only, `POST /api/v1/devices/<number>/intake/` accepts verified CPU/model/RAM/storage measurements plus `hwid` and `expected_revision`. Later workflow stages reject intake writes.
+
+`POST /api/v1/devices/<number>/inspection/` accepts a UUID `request_id`, `hwid`, `expected_revision`, phase (`STARTED`, `IN_PROGRESS`, `COMPLETE`), technician, notes and a dictionary of test results. Each result preserves outcome, notes, evidence and attempt history. The API moves allowed devices to `INSPECTION`, sets status to `Inspektion`, adds a readable inspection record and retains the structured snapshot. A unique request ID prevents duplicate records after lost responses; reused IDs with different content are rejected. Inventory workflow checks, hardware matching and API-key permissions remain enforced. Completed inspections require a named technician and no unfinished results; unavailable tests remain distinct from hardware failures.
+
+Apply migrations through `0015_inspectionsubmission` before deploying the new USB application. Wi-Fi credentials and inventory API keys stay on USB persistent storage, not in this repository.
diff --git a/inventory/api_identity.py b/inventory/api_identity.py
new file mode 100644
index 0000000..215b319
--- /dev/null
+++ b/inventory/api_identity.py
@@ -0,0 +1,88 @@
+"""Atomic hardware identity registration for intake clients."""
+import re
+import uuid
+from django.db import transaction
+from django.db.models import Q
+from rest_framework import serializers
+from rest_framework.response import Response
+from rest_framework.views import APIView
+from .api import SecureAPIResponseMixin, StrictSerializer, DeviceSerializer
+from .models import Device, DeviceIdentity, NumberSequence, ChoiceValue, AuditLog
+from .query import COMPUTER_RELATIONS
+from .services import add_audit
+
+
+def canonical_hwid(value):
+    value = value.strip().lower()
+    if value.startswith('dmi-uuid:'):
+        try:
+            token = uuid.UUID(value[9:])
+        except ValueError:
+            raise serializers.ValidationError('Ungültige Hardware-UUID.')
+        if token.int in (0, (1 << 128) - 1):
+            raise serializers.ValidationError('Platzhalter-UUID ist nicht erlaubt.')
+        return 'dmi-uuid:' + str(token)
+    if re.fullmatch(r'dmi-serial-sha256:[0-9a-f]{64}', value):
+        return value
+    raise serializers.ValidationError('Verifizierbare Hardware-Kennung erforderlich.')
+
+
+class IdentitySerializer(StrictSerializer):
+    hwid = serializers.CharField(max_length=100)
+    aliases = serializers.ListField(child=serializers.CharField(max_length=100), max_length=2, required=False, default=list)
+    device_kind = serializers.ChoiceField(choices=['Laptop', 'Desktop', 'AiO'])
+    model = serializers.CharField(max_length=200, required=False, default='')
+
+    def validate_aliases(self, values):
+        return list(dict.fromkeys(canonical_hwid(v) for v in values))
+
+    def validate_hwid(self, value):
+        return canonical_hwid(value)
+
+
+class DeviceResolveView(SecureAPIResponseMixin, APIView):
+    @transaction.atomic
+    def post(self, request):
+        data = IdentitySerializer(data=request.data)
+        data.is_valid(raise_exception=True)
+        values = data.validated_data
+        hwid = values['hwid']
+        # Serialize allocation and identity lookup across clients and processes.
+        NumberSequence.objects.select_for_update().get_or_create(name='device')
+        keys = list(dict.fromkeys([hwid, *values['aliases']]))
+        # At most one value per source. Differing UUIDs/serials need review.
+        if len({k.split(':')[0] for k in keys}) != len(keys):
+            return Response({'detail': 'Widersprüchliche Hardware-Kennungen.'}, status=409)
+        ids = set(DeviceIdentity.objects.filter(hwid__in=keys).values_list('device_id', flat=True))
+        query = Q()
+        for relation in COMPUTER_RELATIONS:
+            for key in keys:
+                query |= Q(**{f'{relation}__hwid__iexact': key})
+                if key.startswith('dmi-uuid:'):
+                    query |= Q(**{f'{relation}__hwid__iexact': key[9:]})
+        ids.update(Device.objects.filter(query).values_list('pk', flat=True))
+        if len(ids) > 1:
+            return Response({'detail': 'Hardware-Kennungen sind mehreren Geräten zugeordnet.'}, status=409)
+        device = Device.objects.get(pk=next(iter(ids))) if ids else None
+        if device is not None:
+            if device.archived_at:
+                return Response({'detail': 'Gerät ist archiviert; zuerst im Inventory prüfen.'}, status=409)
+            if values['model'] and device.model and values['model'].casefold() != device.model.strip().casefold():
+                return Response({'detail': 'Hardware-Kennung vorhanden, aber Modell stimmt nicht überein.'}, status=409)
+            stored = list(device.hardware_identities.values_list('hwid', flat=True))
+            for key in keys:
+                if any(old.split(':')[0] == key.split(':')[0] and old != key for old in stored):
+                    return Response({'detail': 'UUID oder Seriennummer hat sich geändert; Gerät manuell prüfen.'}, status=409)
+            for key in keys:
+                DeviceIdentity.objects.get_or_create(hwid=key, defaults={'device': device})
+            return Response(DeviceSerializer(device).data)
+        status = ChoiceValue.objects.filter(kind='status', active=True, label__iexact='Eingang').first()
+        kind = ChoiceValue.objects.filter(kind='device_type', active=True, label__iexact=values['device_kind']).first()
+        if not status or not kind:
+            raise serializers.ValidationError('Aktiver Status Eingang und passender Gerätetyp müssen konfiguriert sein.')
+        device = Device.objects.create(status=status, device_type=kind, hwid=hwid, model=values['model'])
+        for key in keys:
+            DeviceIdentity.objects.create(hwid=key, device=device)
+        add_audit(request.user, device, AuditLog.Action.CREATE,
+                  new=f'Gerät #{device.number} per Hardware-Kennung', api_client=request.auth.name)
+        return Response(DeviceSerializer(device).data, status=201)
diff --git a/inventory/api_station.py b/inventory/api_station.py
new file mode 100644
index 0000000..03dbbd5
--- /dev/null
+++ b/inventory/api_station.py
@@ -0,0 +1,98 @@
+"""USB station: guarded intake updates and idempotent inspection snapshots."""
+import hashlib
+import json
+from django.db import transaction
+from django.shortcuts import get_object_or_404
+from rest_framework import serializers
+from rest_framework.response import Response
+from rest_framework.views import APIView
+from .api import SecureAPIResponseMixin, StrictSerializer, DeviceSerializer, apply_changes
+from .api_identity import canonical_hwid
+from .models import Device, DeviceIdentity, ChoiceValue, InspectionSubmission, InspectionRecord, AuditLog
+from .services import add_audit
+from .workflow import advance_device
+
+class IdentityRequest(StrictSerializer):
+    hwid = serializers.CharField(max_length=100)
+    expected_revision = serializers.IntegerField(min_value=1)
+    def validate_hwid(self, value): return canonical_hwid(value)
+
+class SpecsSerializer(StrictSerializer):
+    model = serializers.CharField(max_length=200, required=False)
+    cpu = serializers.CharField(max_length=200, required=False)
+    ram_gb = serializers.IntegerField(min_value=1, max_value=2048, required=False)
+    ssd_gb = serializers.IntegerField(min_value=1, required=False)
+    hdd_gb = serializers.IntegerField(min_value=1, required=False)
+
+class IntakeRequest(IdentityRequest):
+    specifications = SpecsSerializer()
+
+class ResultSerializer(StrictSerializer):
+    outcome = serializers.ChoiceField(choices=['NOT_TESTED','NOT_APPLICABLE','PASS','HARDWARE_FAILURE','UNAVAILABLE','SETUP_PROBLEM','NEEDS_REVIEW'])
+    notes = serializers.CharField(max_length=10000, allow_blank=True, required=False, default='')
+    evidence = serializers.CharField(max_length=100000, allow_blank=True, required=False, default='')
+    history = serializers.ListField(child=serializers.JSONField(), max_length=500, required=False, default=list)
+
+class InspectionRequest(IdentityRequest):
+    request_id = serializers.UUIDField()
+    phase = serializers.ChoiceField(choices=['STARTED','IN_PROGRESS','COMPLETE'])
+    technician = serializers.CharField(max_length=200, allow_blank=True)
+    notes = serializers.CharField(max_length=10000, allow_blank=True)
+    results = serializers.DictField(child=ResultSerializer())
+    def validate_results(self, value):
+        if len(value)>50 or len(json.dumps(value))>500000:
+            raise serializers.ValidationError('Too many inspection results.')
+        if any(len(k)>80 for k in value): raise serializers.ValidationError('Invalid test name.')
+        return value
+    def validate(self, attrs):
+        if attrs['phase']=='COMPLETE' and (not attrs['technician'].strip() or not attrs['results'] or any(r['outcome'] in ['NOT_TESTED','NEEDS_REVIEW'] for r in attrs['results'].values())):
+            raise serializers.ValidationError('Complete all tests and enter the technician name first.')
+        return attrs
+
+def locked_device(number, hwid):
+    d=get_object_or_404(Device.objects.select_for_update(), number=number, archived_at__isnull=True)
+    if not DeviceIdentity.objects.filter(device=d,hwid=hwid).exists():
+        raise serializers.ValidationError('Hardware identity does not match this device.')
+    return d
+
+class IntakeSyncView(SecureAPIResponseMixin, APIView):
+    @transaction.atomic
+    def post(self, request, number):
+        s=IntakeRequest(data=request.data);s.is_valid(raise_exception=True);v=s.validated_data
+        d=locked_device(number,v['hwid'])
+        if d.stage != Device.Stage.INTAKE or d.revision != v['expected_revision']:
+            return Response({'detail':'Device state changed. Refresh before intake sync.'},status=409)
+        changes={k:x for k,x in v['specifications'].items() if getattr(d,k)!=x}
+        if changes:
+            d=apply_changes(d,changes,user=request.user,api_client=request.auth.name,expected_revision=d.revision)
+        return Response(DeviceSerializer(d).data)
+
+class InspectionSyncView(SecureAPIResponseMixin, APIView):
+    @transaction.atomic
+    def post(self, request, number):
+        s=InspectionRequest(data=request.data);s.is_valid(raise_exception=True);v=s.validated_data
+        d=locked_device(number,v['hwid'])
+        payload={k:x for k,x in request.data.items() if k not in ['expected_revision','request_id']}
+        digest=hashlib.sha256(json.dumps(payload,sort_keys=True,separators=(',',':')).encode()).hexdigest()
+        previous=InspectionSubmission.objects.filter(request_id=v['request_id']).first()
+        if previous:
+            if previous.device_id != d.pk or previous.payload_hash != digest:
+                return Response({'detail':'Request ID already used for different results.'},status=409)
+            return Response(DeviceSerializer(d).data)
+        if d.revision != v['expected_revision'] or d.stage not in [Device.Stage.INTAKE,Device.Stage.INSPECTION,Device.Stage.REPAIR]:
+            return Response({'detail':'Device state changed. Refresh before inspection sync.'},status=409)
+        if d.stage != Device.Stage.INSPECTION:
+            d=advance_device(d.pk,Device.Stage.INSPECTION,user=request.user,note='USB inspection',expected_revision=d.revision)
+        state=ChoiceValue.objects.get(kind='status',label='Inspektion',active=True)
+        if d.status_id != state.pk:
+            old=d.status;d.status=state;d.save(update_fields=['status'])
+            add_audit(request.user,d,AuditLog.Action.UPDATE,'Status',old,state,api_client=request.auth.name)
+        else:
+            d.save(update_fields=['updated_at'])
+        InspectionSubmission.objects.create(request_id=v['request_id'],device=d,payload_hash=digest,payload=payload,recorded_by=request.user)
+        lines=[f"USB {v['phase']} · {v['technician']}",v['notes']]
+        lines += [f"{key}: {result['outcome']} — {result['notes']}" for key,result in v['results'].items()]
+        summary='\n'.join(lines)
+        InspectionRecord.objects.create(device=d,defects=summary,recorded_by=request.user)
+        add_audit(request.user,d,AuditLog.Action.UPDATE,'USB inspection','',summary,api_client=request.auth.name)
+        return Response(DeviceSerializer(d).data,status=201)
diff --git a/inventory/api_urls.py b/inventory/api_urls.py
index 45f557d..063fdc2 100644
--- a/inventory/api_urls.py
+++ b/inventory/api_urls.py
@@ -3,9 +3,15 @@ from django.urls import path
 from .api import BulkUpdateView, ChoicesView, DeviceDetailView, DeviceListView
 
 
+from .api_identity import DeviceResolveView
+from .api_station import IntakeSyncView, InspectionSyncView
+
 app_name = "inventory-api"
 
 urlpatterns = [
+    path("devices/<int:number>/intake/", IntakeSyncView.as_view(), name="device-intake"),
+    path("devices/<int:number>/inspection/", InspectionSyncView.as_view(), name="device-inspection"),
+    path("devices/resolve/", DeviceResolveView.as_view(), name="device-resolve"),
     path("devices/", DeviceListView.as_view(), name="device-list"),
     path("devices/bulk-update/", BulkUpdateView.as_view(), name="device-bulk-update"),
     path("devices/<int:number>/", DeviceDetailView.as_view(), name="device-detail"),
diff --git a/inventory/migrations/0014_deviceidentity.py b/inventory/migrations/0014_deviceidentity.py
new file mode 100644
index 0000000..dc6940d
--- /dev/null
+++ b/inventory/migrations/0014_deviceidentity.py
@@ -0,0 +1,11 @@
+from django.db import migrations, models
+import django.db.models.deletion
+
+class Migration(migrations.Migration):
+    dependencies = [('inventory', '0013_deviceregistration')]
+    operations = [migrations.CreateModel(name='DeviceIdentity', fields=[
+        ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+        ('hwid', models.CharField(max_length=100, unique=True)),
+        ('created_at', models.DateTimeField(auto_now_add=True)),
+        ('device', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='hardware_identities', to='inventory.device')),
+    ])]
diff --git a/inventory/migrations/0015_inspectionsubmission.py b/inventory/migrations/0015_inspectionsubmission.py
new file mode 100644
index 0000000..25b3638
--- /dev/null
+++ b/inventory/migrations/0015_inspectionsubmission.py
@@ -0,0 +1,16 @@
+from django.db import migrations, models
+import django.db.models.deletion
+from django.conf import settings
+
+def add_status(apps, schema_editor):
+    apps.get_model('inventory','ChoiceValue').objects.get_or_create(kind='status',label='Inspektion',defaults={'active':True})
+
+class Migration(migrations.Migration):
+    dependencies=[('inventory','0014_deviceidentity'),migrations.swappable_dependency(settings.AUTH_USER_MODEL)]
+    operations=[migrations.CreateModel(name='InspectionSubmission',fields=[
+        ('id',models.BigAutoField(auto_created=True,primary_key=True,serialize=False,verbose_name='ID')),
+        ('request_id',models.UUIDField(unique=True)),('payload_hash',models.CharField(max_length=64)),
+        ('payload',models.JSONField()),('created_at',models.DateTimeField(auto_now_add=True)),
+        ('device',models.ForeignKey(on_delete=django.db.models.deletion.PROTECT,related_name='usb_inspections',to='inventory.device')),
+        ('recorded_by',models.ForeignKey(null=True,on_delete=django.db.models.deletion.SET_NULL,to=settings.AUTH_USER_MODEL)),
+    ]),migrations.RunPython(add_status,migrations.RunPython.noop)]
diff --git a/inventory/models.py b/inventory/models.py
index 3cb466c..15b064f 100644
--- a/inventory/models.py
+++ b/inventory/models.py
@@ -570,3 +570,18 @@ class ImportJob(TimeStampedModel):
     headers = models.JSONField(default=list)
     preview_rows = models.JSONField(default=list)
     result = models.JSONField(default=dict)
+
+
+class DeviceIdentity(models.Model):
+    """Stable intake identity, independent of mutable specifications and USBs."""
+    hwid = models.CharField(max_length=100, unique=True)
+    device = models.ForeignKey(Device, on_delete=models.PROTECT, related_name='hardware_identities')
+    created_at = models.DateTimeField(auto_now_add=True)
+
+class InspectionSubmission(models.Model):
+    request_id = models.UUIDField(unique=True)
+    device = models.ForeignKey(Device, on_delete=models.PROTECT, related_name='usb_inspections')
+    payload_hash = models.CharField(max_length=64)
+    payload = models.JSONField()
+    recorded_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True)
+    created_at = models.DateTimeField(auto_now_add=True)
diff --git a/inventory/test_identity.py b/inventory/test_identity.py
new file mode 100644
index 0000000..bea3f03
--- /dev/null
+++ b/inventory/test_identity.py
@@ -0,0 +1,84 @@
+import json
+import uuid
+from datetime import timedelta
+from concurrent.futures import ThreadPoolExecutor
+from threading import Barrier
+from django.contrib.auth.models import User
+from django.db import close_old_connections, IntegrityError, transaction
+from django.test import TestCase, TransactionTestCase, Client, skipUnlessDBFeature
+from django.utils import timezone
+from .models import Device, DeviceIdentity, ChoiceValue, InventoryAPIKey, NumberSequence
+
+class IdentityTests(TestCase):
+    def setUp(self):
+        self.user = User.objects.create_user('identity-operator', is_superuser=True)
+        _, self.key = InventoryAPIKey.objects.create_key(name='identity', service_user=self.user,
+            can_read=True, can_write=True, expiry_date=timezone.now()+timedelta(days=1))
+        self.status = ChoiceValue.objects.create(kind='status', label='Eingang')
+        self.kind = ChoiceValue.objects.create(kind='device_type', label='Laptop')
+        self.payload = {'hwid': 'dmi-uuid:'+str(uuid.uuid4()), 'device_kind': 'Laptop', 'model': 'Test Laptop'}
+    def post(self, data=None, key=None):
+        return self.client.post('/api/v1/devices/resolve/', json.dumps(data or self.payload), content_type='application/json', HTTP_AUTHORIZATION='Api-Key '+(key or self.key))
+    def test_repeat_uses_same_number_and_preserves_repairs(self):
+        a=self.post(); self.assertEqual(a.status_code,201,a.content)
+        device=Device.objects.get(); device.comment='Repaired'; device.save()
+        b=self.post(); self.assertEqual(b.status_code,200,b.content)
+        self.assertEqual(a.json()['number'],b.json()['number'])
+        self.assertEqual(Device.objects.get().comment,'Repaired')
+        self.assertEqual(DeviceIdentity.objects.count(),1)
+    def test_existing_raw_uuid_is_reused(self):
+        d=Device.objects.create(status=self.status,device_type=self.kind,hwid=self.payload['hwid'][9:],model='Test Laptop')
+        r=self.post(); self.assertEqual(r.status_code,200,r.content); self.assertEqual(r.json()['number'],d.number)
+    def test_invalid_identifier_and_model_conflict(self):
+        for hwid in ['','unknown','dmi-uuid:00000000-0000-0000-0000-000000000000','dmi-uuid:ffffffff-ffff-ffff-ffff-ffffffffffff']:
+            self.assertEqual(self.post({**self.payload,'hwid':hwid}).status_code,400)
+        self.post(); self.assertEqual(self.post({**self.payload,'model':'Different'}).status_code,409)
+        self.assertEqual(Device.objects.count(),1)
+    def test_existing_ambiguous_or_archived_is_not_duplicated(self):
+        d=Device.objects.create(status=self.status,device_type=self.kind,hwid=self.payload['hwid'],archived_at=timezone.now())
+        self.assertEqual(self.post().status_code,409)
+        Device.objects.create(status=self.status,device_type=self.kind,hwid=self.payload['hwid'])
+        self.assertEqual(self.post().status_code,409)
+        self.assertEqual(Device.objects.count(),2)
+    def test_readonly_cannot_register(self):
+        _,key=InventoryAPIKey.objects.create_key(name='read',service_user=self.user,can_read=True,can_write=False,expiry_date=timezone.now()+timedelta(days=1))
+        self.assertEqual(self.post(key=key).status_code,403)
+        self.assertFalse(Device.objects.exists())
+    def test_serial_fallback_then_uuid_does_not_duplicate(self):
+        serial='dmi-serial-sha256:'+'a'*64
+        first=self.post({**self.payload,'hwid':serial})
+        second=self.post({**self.payload,'aliases':[serial]})
+        self.assertEqual(first.status_code,201,first.content)
+        self.assertEqual(second.status_code,200,second.content)
+        self.assertEqual(first.json()['number'],second.json()['number'])
+        self.assertEqual(DeviceIdentity.objects.count(),2)
+        conflict=self.post({**self.payload,'aliases':['dmi-serial-sha256:'+'b'*64]})
+        self.assertEqual(conflict.status_code,409,conflict.content)
+        self.assertEqual(Device.objects.count(),1)
+
+    def test_database_enforces_unique_identity(self):
+        self.post()
+        with self.assertRaises(IntegrityError), transaction.atomic():
+            DeviceIdentity.objects.create(hwid=self.payload['hwid'],device=Device.objects.get())
+
+class ConcurrentIdentityTests(TransactionTestCase):
+    @skipUnlessDBFeature('has_select_for_update')
+    def test_two_clients_allocate_once(self):
+        user=User.objects.create_user('concurrent-identity',is_superuser=True)
+        _,key=InventoryAPIKey.objects.create_key(name='identity',service_user=user,can_read=True,can_write=True,expiry_date=timezone.now()+timedelta(days=1))
+        ChoiceValue.objects.create(kind='status',label='Eingang')
+        ChoiceValue.objects.create(kind='device_type',label='Laptop')
+        NumberSequence.objects.update_or_create(name='device',defaults={'last_value':0})
+        payload={'hwid':'dmi-uuid:'+str(uuid.uuid4()),'device_kind':'Laptop'}
+        barrier=Barrier(2)
+        def submit(_):
+            close_old_connections()
+            try:
+                barrier.wait(timeout=10)
+                r=Client().post('/api/v1/devices/resolve/',json.dumps(payload),content_type='application/json',HTTP_AUTHORIZATION='Api-Key '+key)
+                return r.status_code,r.json()['number']
+            finally: close_old_connections()
+        with ThreadPoolExecutor(max_workers=2) as pool: results=list(pool.map(submit,range(2)))
+        self.assertEqual(sorted(x[0] for x in results),[200,201])
+        self.assertEqual(len({x[1] for x in results}),1)
+        self.assertEqual(Device.objects.count(),1)
diff --git a/inventory/test_station.py b/inventory/test_station.py
new file mode 100644
index 0000000..51842ec
--- /dev/null
+++ b/inventory/test_station.py
@@ -0,0 +1,51 @@
+import json,uuid
+from datetime import timedelta
+from django.test import TestCase
+from django.contrib.auth.models import User
+from django.utils import timezone
+from .models import Device,DeviceIdentity,ChoiceValue,InventoryAPIKey,InspectionSubmission,InspectionRecord
+
+class StationTests(TestCase):
+    def setUp(self):
+        self.user=User.objects.create_user('station',is_superuser=True)
+        _,self.key=InventoryAPIKey.objects.create_key(name='station',service_user=self.user,can_read=True,can_write=True,expiry_date=timezone.now()+timedelta(days=1))
+        state=ChoiceValue.objects.create(kind='status',label='Eingang')
+        ChoiceValue.objects.get_or_create(kind='status',label='Inspektion',defaults={'active':True})
+        kind=ChoiceValue.objects.create(kind='device_type',label='Laptop')
+        self.d=Device.objects.create(status=state,device_type=kind,model='Test',ram_gb=8)
+        self.hwid='dmi-uuid:'+str(uuid.uuid4())
+        DeviceIdentity.objects.create(hwid=self.hwid,device=self.d)
+    def post(self,route,body,key=None):
+        return self.client.post(f'/api/v1/devices/{self.d.number}/{route}/',json.dumps(body),content_type='application/json',HTTP_AUTHORIZATION='Api-Key '+(key or self.key))
+    def inspection(self,phase='STARTED'):
+        self.d.refresh_from_db()
+        return {'hwid':self.hwid,'expected_revision':self.d.revision,'request_id':str(uuid.uuid4()),'phase':phase,'technician':'Tech','notes':'','results':{'wifi':{'outcome':'PASS','notes':'Connected','history':[]}}}
+    def test_intake_specs_then_start_changes_stage_and_status(self):
+        r=self.post('intake',{'hwid':self.hwid,'expected_revision':self.d.revision,'specifications':{'ram_gb':16,'ssd_gb':512}})
+        self.assertEqual(r.status_code,200,r.content);self.assertEqual(r.json()['stage'],'INTAKE')
+        r=self.post('inspection',self.inspection());self.assertEqual(r.status_code,201,r.content)
+        self.assertEqual(r.json()['stage'],'INSPECTION');self.assertEqual(r.json()['status']['label'],'Inspektion')
+        self.assertEqual(InspectionSubmission.objects.count(),1)
+    def test_repeat_and_completion_preserve_structured_results(self):
+        body=self.inspection('COMPLETE');body['results']['wifi']['outcome']='UNAVAILABLE'
+        r=self.post('inspection',body);self.assertEqual(r.status_code,201,r.content)
+        self.assertEqual(self.post('inspection',body).status_code,200)
+        self.assertEqual(InspectionSubmission.objects.count(),1);self.assertEqual(InspectionRecord.objects.count(),1)
+        self.assertEqual(InspectionSubmission.objects.get().payload['results']['wifi']['outcome'],'UNAVAILABLE')
+        body['notes']='different';self.assertEqual(self.post('inspection',body).status_code,409)
+    def test_incomplete_cannot_be_completed(self):
+        body=self.inspection('COMPLETE');body['results']['wifi']['outcome']='NOT_TESTED'
+        self.assertEqual(self.post('inspection',body).status_code,400)
+        self.assertFalse(InspectionSubmission.objects.exists())
+    def test_stale_revision_wrong_device_and_later_stages_blocked(self):
+        body=self.inspection();self.d.comment='Changed';self.d.save()
+        self.assertEqual(self.post('inspection',body).status_code,409)
+        body=self.inspection();body['hwid']='dmi-uuid:'+str(uuid.uuid4())
+        self.assertEqual(self.post('inspection',body).status_code,400)
+        self.d.stage='STORAGE';self.d.save()
+        self.assertEqual(self.post('inspection',self.inspection()).status_code,409)
+        self.assertEqual(self.post('intake',{'hwid':self.hwid,'expected_revision':self.d.revision,'specifications':{'ram_gb':32}}).status_code,409)
+        self.d.refresh_from_db();self.assertEqual(self.d.ram_gb,8)
+    def test_readonly_cannot_change_inspection(self):
+        _,key=InventoryAPIKey.objects.create_key(name='read',service_user=self.user,can_read=True,can_write=False,expiry_date=timezone.now()+timedelta(days=1))
+        self.assertEqual(self.post('inspection',self.inspection(),key).status_code,403)
diff --git a/inventory/workflow.py b/inventory/workflow.py
index 637f2ea..bdee5fa 100644
--- a/inventory/workflow.py
+++ b/inventory/workflow.py
@@ -17,6 +17,7 @@ TRANSITIONS = {
     Device.Stage.ISSUED: {Device.Stage.INTAKE},
 }
 STATUS_BY_STAGE = {
+    Device.Stage.INSPECTION: "Inspektion",
     Device.Stage.INTAKE: "Eingang",
     Device.Stage.REPAIR: "Defekt",
     Device.Stage.STORAGE: "Fertig",