diff --git a/app/Http/Controllers/Api/CityController.php b/app/Http/Controllers/Api/CityController.php
index e57387c..2c1f1e6 100644
--- a/app/Http/Controllers/Api/CityController.php
+++ b/app/Http/Controllers/Api/CityController.php
@@ -3,13 +3,19 @@
 namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
+use App\Http\Requests\Api\StoreCityRequest;
+use App\Http\Requests\Api\UpdateCityRequest;
+use App\Http\Resources\CityResource;
 use App\Models\City;
-use App\Models\Lecturer;
-use Dedoc\Scramble\Attributes\ExcludeRouteFromDocs;
 use Dedoc\Scramble\Attributes\Group;
 use Dedoc\Scramble\Attributes\QueryParameter;
+use Dedoc\Scramble\Attributes\Response as ResponseAttribute;
 use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\AnonymousResourceCollection;
+use Illuminate\Support\Facades\Gate;
+use Symfony\Component\HttpFoundation\Response;
 
 #[Group(name: 'Stammdaten', weight: 5)]
 class CityController extends Controller
@@ -41,27 +47,64 @@ class CityController extends Controller
             ->get();
     }
 
-    #[ExcludeRouteFromDocs]
-    public function store(Request $request)
+    /**
+     * Stadt anlegen
+     *
+     * Erlaubt einem authentifizierten Nutzer, eine Stadt programmatisch anzulegen.
+     * Der Ersteller (created_by) wird automatisch gesetzt.
+     */
+    #[ResponseAttribute(status: 401, description: 'Nicht authentifiziert.')]
+    #[ResponseAttribute(status: 422, description: 'Validierungsfehler.')]
+    public function store(StoreCityRequest $request): JsonResponse
     {
-        //
+        $city = City::create($request->validated());
+
+        return CityResource::make($city->fresh())
+            ->response()
+            ->setStatusCode(Response::HTTP_CREATED);
     }
 
-    #[ExcludeRouteFromDocs]
-    public function show(Lecturer $lecturer)
+    /**
+     * Stadt aktualisieren
+     *
+     * Aktualisiert eine Stadt; nur fuer den Ersteller oder einen Super-Admin.
+     */
+    #[ResponseAttribute(status: 403, description: 'Nur der Ersteller oder ein Super-Admin darf die Stadt aendern.')]
+    #[ResponseAttribute(status: 422, description: 'Validierungsfehler.')]
+    public function update(UpdateCityRequest $request, City $city): CityResource
     {
-        //
+        $city->update($request->validated());
+
+        return CityResource::make($city->fresh());
     }
 
-    #[ExcludeRouteFromDocs]
-    public function update(Request $request, Lecturer $lecturer)
+    /**
+     * Eigene Staedte auflisten
+     *
+     * Liefert alle vom authentifizierten Nutzer erstellten Staedte, alphabetisch sortiert.
+     */
+    public function mine(Request $request): AnonymousResourceCollection
     {
-        //
+        Gate::authorize('viewAny', City::class);
+
+        $cities = City::query()
+            ->where('created_by', $request->user()->id)
+            ->orderBy('name')
+            ->get();
+
+        return CityResource::collection($cities);
     }
 
-    #[ExcludeRouteFromDocs]
-    public function destroy(Lecturer $lecturer)
+    /**
+     * Eigene Stadt anzeigen
+     *
+     * Zeigt eine einzelne, vom authentifizierten Nutzer erstellte Stadt.
+     */
+    #[ResponseAttribute(status: 403, description: 'Nur der Ersteller oder ein Super-Admin darf die Stadt sehen.')]
+    public function mineShow(City $city): CityResource
     {
-        //
+        Gate::authorize('view', $city);
+
+        return CityResource::make($city);
     }
 }
diff --git a/app/Http/Controllers/Api/LecturerController.php b/app/Http/Controllers/Api/LecturerController.php
index 4346dc9..faac6b4 100644
--- a/app/Http/Controllers/Api/LecturerController.php
+++ b/app/Http/Controllers/Api/LecturerController.php
@@ -3,12 +3,19 @@
 namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
+use App\Http\Requests\Api\StoreLecturerRequest;
+use App\Http\Requests\Api\UpdateLecturerRequest;
+use App\Http\Resources\LecturerResource;
 use App\Models\Lecturer;
-use Dedoc\Scramble\Attributes\ExcludeRouteFromDocs;
 use Dedoc\Scramble\Attributes\Group;
 use Dedoc\Scramble\Attributes\QueryParameter;
+use Dedoc\Scramble\Attributes\Response as ResponseAttribute;
 use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\AnonymousResourceCollection;
+use Illuminate\Support\Facades\Gate;
+use Symfony\Component\HttpFoundation\Response;
 
 #[Group(name: 'Referenten', weight: 4)]
 class LecturerController extends Controller
@@ -48,38 +55,63 @@ class LecturerController extends Controller
     }
 
     /**
-     * Store a newly created resource in storage.
+     * Referent anlegen
+     *
+     * Erlaubt einem authentifizierten Nutzer, einen Referenten programmatisch anzulegen.
+     * Der Ersteller (created_by) wird automatisch gesetzt.
      */
-    #[ExcludeRouteFromDocs]
-    public function store(Request $request)
+    #[ResponseAttribute(status: 401, description: 'Nicht authentifiziert.')]
+    #[ResponseAttribute(status: 422, description: 'Validierungsfehler.')]
+    public function store(StoreLecturerRequest $request): JsonResponse
     {
-        //
+        $lecturer = Lecturer::create($request->validated());
+
+        return LecturerResource::make($lecturer->fresh())
+            ->response()
+            ->setStatusCode(Response::HTTP_CREATED);
     }
 
     /**
-     * Display the specified resource.
+     * Referent aktualisieren
+     *
+     * Aktualisiert einen Referenten; nur fuer den Ersteller oder einen Super-Admin.
      */
-    #[ExcludeRouteFromDocs]
-    public function show(Lecturer $lecturer)
+    #[ResponseAttribute(status: 403, description: 'Nur der Ersteller oder ein Super-Admin darf den Referenten aendern.')]
+    #[ResponseAttribute(status: 422, description: 'Validierungsfehler.')]
+    public function update(UpdateLecturerRequest $request, Lecturer $lecturer): LecturerResource
     {
-        //
+        $lecturer->update($request->validated());
+
+        return LecturerResource::make($lecturer->fresh());
     }
 
     /**
-     * Update the specified resource in storage.
+     * Eigene Referenten auflisten
+     *
+     * Liefert alle vom authentifizierten Nutzer erstellten Referenten, alphabetisch sortiert.
      */
-    #[ExcludeRouteFromDocs]
-    public function update(Request $request, Lecturer $lecturer)
+    public function mine(Request $request): AnonymousResourceCollection
     {
-        //
+        Gate::authorize('viewAny', Lecturer::class);
+
+        $lecturers = Lecturer::query()
+            ->where('created_by', $request->user()->id)
+            ->orderBy('name')
+            ->get();
+
+        return LecturerResource::collection($lecturers);
     }
 
     /**
-     * Remove the specified resource from storage.
+     * Eigenen Referenten anzeigen
+     *
+     * Zeigt einen einzelnen, vom authentifizierten Nutzer erstellten Referenten.
      */
-    #[ExcludeRouteFromDocs]
-    public function destroy(Lecturer $lecturer)
+    #[ResponseAttribute(status: 403, description: 'Nur der Ersteller oder ein Super-Admin darf den Referenten sehen.')]
+    public function mineShow(Lecturer $lecturer): LecturerResource
     {
-        //
+        Gate::authorize('view', $lecturer);
+
+        return LecturerResource::make($lecturer);
     }
 }
diff --git a/app/Http/Controllers/Api/MeetupController.php b/app/Http/Controllers/Api/MeetupController.php
index f30b700..70e51b9 100644
--- a/app/Http/Controllers/Api/MeetupController.php
+++ b/app/Http/Controllers/Api/MeetupController.php
@@ -3,13 +3,19 @@
 namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
+use App\Http\Requests\Api\StoreMeetupRequest;
+use App\Http\Requests\Api\UpdateMeetupRequest;
+use App\Http\Resources\MeetupResource;
 use App\Models\Meetup;
 use Dedoc\Scramble\Attributes\ExcludeRouteFromDocs;
 use Dedoc\Scramble\Attributes\Group;
 use Dedoc\Scramble\Attributes\QueryParameter;
 use Dedoc\Scramble\Attributes\Response;
 use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\AnonymousResourceCollection;
+use Illuminate\Support\Facades\Gate;
 
 #[Group(name: 'Meetups', weight: 3)]
 class MeetupController extends Controller
@@ -63,27 +69,64 @@ class MeetupController extends Controller
             });
     }
 
-    #[ExcludeRouteFromDocs]
-    public function store(Request $request)
+    /**
+     * Meetup anlegen
+     *
+     * Erlaubt einem authentifizierten Nutzer, ein Meetup programmatisch anzulegen.
+     * Der Ersteller (created_by) wird automatisch gesetzt.
+     */
+    #[Response(status: 401, description: 'Nicht authentifiziert.')]
+    #[Response(status: 422, description: 'Validierungsfehler.')]
+    public function store(StoreMeetupRequest $request): JsonResponse
     {
-        //
+        $meetup = Meetup::create($request->validated());
+
+        return MeetupResource::make($meetup->fresh())
+            ->response()
+            ->setStatusCode(\Symfony\Component\HttpFoundation\Response::HTTP_CREATED);
     }
 
-    #[ExcludeRouteFromDocs]
-    public function show(Meetup $meetup)
+    /**
+     * Meetup aktualisieren
+     *
+     * Aktualisiert ein Meetup; nur fuer den Ersteller oder einen Super-Admin.
+     */
+    #[Response(status: 403, description: 'Nur der Ersteller oder ein Super-Admin darf das Meetup aendern.')]
+    #[Response(status: 422, description: 'Validierungsfehler.')]
+    public function update(UpdateMeetupRequest $request, Meetup $meetup): MeetupResource
     {
-        //
+        $meetup->update($request->validated());
+
+        return MeetupResource::make($meetup->fresh());
     }
 
-    #[ExcludeRouteFromDocs]
-    public function update(Request $request, Meetup $meetup)
+    /**
+     * Eigene Meetups auflisten
+     *
+     * Liefert alle vom authentifizierten Nutzer erstellten Meetups, alphabetisch sortiert.
+     */
+    public function mine(Request $request): AnonymousResourceCollection
     {
-        //
+        Gate::authorize('viewAny', Meetup::class);
+
+        $meetups = Meetup::query()
+            ->where('created_by', $request->user()->id)
+            ->orderBy('name')
+            ->get();
+
+        return MeetupResource::collection($meetups);
     }
 
-    #[ExcludeRouteFromDocs]
-    public function destroy(Meetup $meetup)
+    /**
+     * Eigenes Meetup anzeigen
+     *
+     * Zeigt ein einzelnes, vom authentifizierten Nutzer erstelltes Meetup.
+     */
+    #[Response(status: 403, description: 'Nur der Ersteller oder ein Super-Admin darf das Meetup sehen.')]
+    public function mineShow(Meetup $meetup): MeetupResource
     {
-        //
+        Gate::authorize('view', $meetup);
+
+        return MeetupResource::make($meetup);
     }
 }
diff --git a/app/Http/Controllers/Api/MeetupEventController.php b/app/Http/Controllers/Api/MeetupEventController.php
index 6384060..b4c88a1 100644
--- a/app/Http/Controllers/Api/MeetupEventController.php
+++ b/app/Http/Controllers/Api/MeetupEventController.php
@@ -3,11 +3,20 @@
 namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
+use App\Http\Requests\Api\StoreMeetupEventRequest;
+use App\Http\Requests\Api\UpdateMeetupEventRequest;
+use App\Http\Resources\MeetupEventResource;
 use App\Models\MeetupEvent;
 use Carbon\Carbon;
 use Dedoc\Scramble\Attributes\Group;
 use Dedoc\Scramble\Attributes\PathParameter;
+use Dedoc\Scramble\Attributes\Response as ResponseAttribute;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\AnonymousResourceCollection;
 use Illuminate\Support\Collection;
+use Illuminate\Support\Facades\Gate;
+use Symfony\Component\HttpFoundation\Response;
 
 #[Group(name: 'Meetups', weight: 3)]
 class MeetupEventController extends Controller
@@ -66,4 +75,65 @@ class MeetupEventController extends Controller
         ],
         );
     }
+
+    /**
+     * Meetup-Event anlegen
+     *
+     * Erlaubt einem authentifizierten Nutzer, ein Meetup-Event programmatisch anzulegen.
+     * Der Ersteller (created_by) wird automatisch gesetzt.
+     */
+    #[ResponseAttribute(status: 401, description: 'Nicht authentifiziert.')]
+    #[ResponseAttribute(status: 422, description: 'Validierungsfehler.')]
+    public function store(StoreMeetupEventRequest $request): JsonResponse
+    {
+        $meetupEvent = MeetupEvent::create($request->validated());
+
+        return MeetupEventResource::make($meetupEvent->fresh())
+            ->response()
+            ->setStatusCode(Response::HTTP_CREATED);
+    }
+
+    /**
+     * Meetup-Event aktualisieren
+     *
+     * Aktualisiert ein Meetup-Event; nur fuer den Ersteller oder einen Super-Admin.
+     */
+    #[ResponseAttribute(status: 403, description: 'Nur der Ersteller oder ein Super-Admin darf das Meetup-Event aendern.')]
+    #[ResponseAttribute(status: 422, description: 'Validierungsfehler.')]
+    public function update(UpdateMeetupEventRequest $request, MeetupEvent $meetupEvent): MeetupEventResource
+    {
+        $meetupEvent->update($request->validated());
+
+        return MeetupEventResource::make($meetupEvent->fresh());
+    }
+
+    /**
+     * Eigene Meetup-Events auflisten
+     *
+     * Liefert alle vom authentifizierten Nutzer erstellten Meetup-Events, nach Startzeit absteigend sortiert.
+     */
+    public function mine(Request $request): AnonymousResourceCollection
+    {
+        Gate::authorize('viewAny', MeetupEvent::class);
+
+        $meetupEvents = MeetupEvent::query()
+            ->where('created_by', $request->user()->id)
+            ->orderByDesc('start')
+            ->get();
+
+        return MeetupEventResource::collection($meetupEvents);
+    }
+
+    /**
+     * Eigenes Meetup-Event anzeigen
+     *
+     * Zeigt ein einzelnes, vom authentifizierten Nutzer erstelltes Meetup-Event.
+     */
+    #[ResponseAttribute(status: 403, description: 'Nur der Ersteller oder ein Super-Admin darf das Meetup-Event sehen.')]
+    public function mineShow(MeetupEvent $meetupEvent): MeetupEventResource
+    {
+        Gate::authorize('view', $meetupEvent);
+
+        return MeetupEventResource::make($meetupEvent);
+    }
 }
diff --git a/app/Http/Controllers/Api/VenueController.php b/app/Http/Controllers/Api/VenueController.php
index decef41..95ce05c 100644
--- a/app/Http/Controllers/Api/VenueController.php
+++ b/app/Http/Controllers/Api/VenueController.php
@@ -3,13 +3,19 @@
 namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
-use App\Models\Lecturer;
+use App\Http\Requests\Api\StoreVenueRequest;
+use App\Http\Requests\Api\UpdateVenueRequest;
+use App\Http\Resources\VenueResource;
 use App\Models\Venue;
-use Dedoc\Scramble\Attributes\ExcludeRouteFromDocs;
 use Dedoc\Scramble\Attributes\Group;
 use Dedoc\Scramble\Attributes\QueryParameter;
+use Dedoc\Scramble\Attributes\Response as ResponseAttribute;
 use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\AnonymousResourceCollection;
+use Illuminate\Support\Facades\Gate;
+use Symfony\Component\HttpFoundation\Response;
 
 #[Group(name: 'Stammdaten', weight: 5)]
 class VenueController extends Controller
@@ -50,38 +56,63 @@ class VenueController extends Controller
     }
 
     /**
-     * Store a newly created resource in storage.
+     * Veranstaltungsort anlegen
+     *
+     * Erlaubt einem authentifizierten Nutzer, einen Veranstaltungsort programmatisch anzulegen.
+     * Der Ersteller (created_by) wird automatisch gesetzt.
      */
-    #[ExcludeRouteFromDocs]
-    public function store(Request $request)
+    #[ResponseAttribute(status: 401, description: 'Nicht authentifiziert.')]
+    #[ResponseAttribute(status: 422, description: 'Validierungsfehler.')]
+    public function store(StoreVenueRequest $request): JsonResponse
     {
-        //
+        $venue = Venue::create($request->validated());
+
+        return VenueResource::make($venue->fresh())
+            ->response()
+            ->setStatusCode(Response::HTTP_CREATED);
     }
 
     /**
-     * Display the specified resource.
+     * Veranstaltungsort aktualisieren
+     *
+     * Aktualisiert einen Veranstaltungsort; nur fuer den Ersteller oder einen Super-Admin.
      */
-    #[ExcludeRouteFromDocs]
-    public function show(Lecturer $lecturer)
+    #[ResponseAttribute(status: 403, description: 'Nur der Ersteller oder ein Super-Admin darf den Veranstaltungsort aendern.')]
+    #[ResponseAttribute(status: 422, description: 'Validierungsfehler.')]
+    public function update(UpdateVenueRequest $request, Venue $venue): VenueResource
     {
-        //
+        $venue->update($request->validated());
+
+        return VenueResource::make($venue->fresh());
     }
 
     /**
-     * Update the specified resource in storage.
+     * Eigene Veranstaltungsorte auflisten
+     *
+     * Liefert alle vom authentifizierten Nutzer erstellten Veranstaltungsorte, alphabetisch sortiert.
      */
-    #[ExcludeRouteFromDocs]
-    public function update(Request $request, Lecturer $lecturer)
+    public function mine(Request $request): AnonymousResourceCollection
     {
-        //
+        Gate::authorize('viewAny', Venue::class);
+
+        $venues = Venue::query()
+            ->where('created_by', $request->user()->id)
+            ->orderBy('name')
+            ->get();
+
+        return VenueResource::collection($venues);
     }
 
     /**
-     * Remove the specified resource from storage.
+     * Eigenen Veranstaltungsort anzeigen
+     *
+     * Zeigt einen einzelnen, vom authentifizierten Nutzer erstellten Veranstaltungsort.
      */
-    #[ExcludeRouteFromDocs]
-    public function destroy(Lecturer $lecturer)
+    #[ResponseAttribute(status: 403, description: 'Nur der Ersteller oder ein Super-Admin darf den Veranstaltungsort sehen.')]
+    public function mineShow(Venue $venue): VenueResource
     {
-        //
+        Gate::authorize('view', $venue);
+
+        return VenueResource::make($venue);
     }
 }
diff --git a/app/Http/Requests/Api/StoreCityRequest.php b/app/Http/Requests/Api/StoreCityRequest.php
new file mode 100644
index 0000000..8b927c9
--- /dev/null
+++ b/app/Http/Requests/Api/StoreCityRequest.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Http\Requests\Api;
+
+use App\Models\City;
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreCityRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()->can('create', City::class);
+    }
+
+    /**
+     * @return array<string, array<int, string>>
+     */
+    public function rules(): array
+    {
+        return [
+            'country_id' => ['required', 'integer', 'exists:countries,id'],
+            'name' => ['required', 'string', 'max:255'],
+            'longitude' => ['required', 'numeric'],
+            'latitude' => ['required', 'numeric'],
+            'population' => ['nullable', 'integer'],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'country_id.exists' => 'Das angegebene Land existiert nicht.',
+        ];
+    }
+}
diff --git a/app/Http/Requests/Api/StoreLecturerRequest.php b/app/Http/Requests/Api/StoreLecturerRequest.php
new file mode 100644
index 0000000..6c434f7
--- /dev/null
+++ b/app/Http/Requests/Api/StoreLecturerRequest.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Http\Requests\Api;
+
+use App\Models\Lecturer;
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreLecturerRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()->can('create', Lecturer::class);
+    }
+
+    /**
+     * @return array<string, array<int, string>>
+     */
+    public function rules(): array
+    {
+        return [
+            'name' => ['required', 'string', 'max:255'],
+            'subtitle' => ['nullable', 'string'],
+            'intro' => ['nullable', 'string'],
+            'description' => ['nullable', 'string'],
+            'active' => ['boolean'],
+            'website' => ['nullable', 'url', 'max:255'],
+            'twitter_username' => ['nullable', 'string', 'max:255'],
+            'nostr' => ['nullable', 'string', 'max:255'],
+            'lightning_address' => ['nullable', 'string', 'max:255'],
+            'lnurl' => ['nullable', 'string'],
+            'node_id' => ['nullable', 'string', 'max:255'],
+            'paynym' => ['nullable', 'string'],
+            'team_id' => ['nullable', 'integer', 'exists:teams,id'],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'team_id.exists' => 'Das angegebene Team existiert nicht.',
+        ];
+    }
+}
diff --git a/app/Http/Requests/Api/StoreMeetupEventRequest.php b/app/Http/Requests/Api/StoreMeetupEventRequest.php
new file mode 100644
index 0000000..8faa6f7
--- /dev/null
+++ b/app/Http/Requests/Api/StoreMeetupEventRequest.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Http\Requests\Api;
+
+use App\Enums\RecurrenceType;
+use App\Models\MeetupEvent;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class StoreMeetupEventRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()->can('create', MeetupEvent::class);
+    }
+
+    /**
+     * @return array<string, array<int, mixed>>
+     */
+    public function rules(): array
+    {
+        return [
+            'meetup_id' => ['required', 'integer', 'exists:meetups,id'],
+            'start' => ['required', 'date'],
+            'location' => ['nullable', 'string', 'max:255'],
+            'description' => ['nullable', 'string'],
+            'link' => ['nullable', 'url', 'max:255'],
+            'recurrence_type' => ['nullable', Rule::enum(RecurrenceType::class)],
+            'recurrence_day_of_week' => ['nullable', 'string', 'max:255'],
+            'recurrence_day_position' => ['nullable', 'string', 'max:255'],
+            'recurrence_interval' => ['nullable', 'integer'],
+            'recurrence_end_date' => ['nullable', 'date', 'after_or_equal:start'],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'meetup_id.exists' => 'Das angegebene Meetup existiert nicht.',
+        ];
+    }
+}
diff --git a/app/Http/Requests/Api/StoreMeetupRequest.php b/app/Http/Requests/Api/StoreMeetupRequest.php
new file mode 100644
index 0000000..b68f715
--- /dev/null
+++ b/app/Http/Requests/Api/StoreMeetupRequest.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Http\Requests\Api;
+
+use App\Models\Meetup;
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreMeetupRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()->can('create', Meetup::class);
+    }
+
+    /**
+     * @return array<string, array<int, string>>
+     */
+    public function rules(): array
+    {
+        return [
+            'name' => ['required', 'string', 'max:255'],
+            'city_id' => ['required', 'integer', 'exists:cities,id'],
+            'intro' => ['nullable', 'string'],
+            'telegram_link' => ['nullable', 'url', 'max:255'],
+            'webpage' => ['nullable', 'url', 'max:255'],
+            'twitter_username' => ['nullable', 'string', 'max:255'],
+            'matrix_group' => ['nullable', 'string', 'max:255'],
+            'nostr' => ['nullable', 'string'],
+            'simplex' => ['nullable', 'string'],
+            'signal' => ['nullable', 'string', 'max:255'],
+            'community' => ['nullable', 'string', 'max:255'],
+            'visible_on_map' => ['boolean'],
+            'is_active' => ['boolean'],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'city_id.exists' => 'Die angegebene Stadt existiert nicht.',
+        ];
+    }
+}
diff --git a/app/Http/Requests/Api/StoreVenueRequest.php b/app/Http/Requests/Api/StoreVenueRequest.php
new file mode 100644
index 0000000..830d031
--- /dev/null
+++ b/app/Http/Requests/Api/StoreVenueRequest.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Http\Requests\Api;
+
+use App\Models\Venue;
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreVenueRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()->can('create', Venue::class);
+    }
+
+    /**
+     * @return array<string, array<int, string>>
+     */
+    public function rules(): array
+    {
+        return [
+            'city_id' => ['required', 'integer', 'exists:cities,id'],
+            'name' => ['required', 'string', 'max:255'],
+            'street' => ['required', 'string', 'max:255'],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'city_id.exists' => 'Die angegebene Stadt existiert nicht.',
+        ];
+    }
+}
diff --git a/app/Http/Requests/Api/UpdateCityRequest.php b/app/Http/Requests/Api/UpdateCityRequest.php
new file mode 100644
index 0000000..b3d2889
--- /dev/null
+++ b/app/Http/Requests/Api/UpdateCityRequest.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Http\Requests\Api;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdateCityRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()->can('update', $this->route('city'));
+    }
+
+    /**
+     * @return array<string, array<int, string>>
+     */
+    public function rules(): array
+    {
+        return [
+            'country_id' => ['sometimes', 'required', 'integer', 'exists:countries,id'],
+            'name' => ['sometimes', 'required', 'string', 'max:255'],
+            'longitude' => ['sometimes', 'required', 'numeric'],
+            'latitude' => ['sometimes', 'required', 'numeric'],
+            'population' => ['sometimes', 'nullable', 'integer'],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'country_id.exists' => 'Das angegebene Land existiert nicht.',
+        ];
+    }
+}
diff --git a/app/Http/Requests/Api/UpdateLecturerRequest.php b/app/Http/Requests/Api/UpdateLecturerRequest.php
new file mode 100644
index 0000000..c5b405d
--- /dev/null
+++ b/app/Http/Requests/Api/UpdateLecturerRequest.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Http\Requests\Api;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdateLecturerRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()->can('update', $this->route('lecturer'));
+    }
+
+    /**
+     * @return array<string, array<int, string>>
+     */
+    public function rules(): array
+    {
+        return [
+            'name' => ['sometimes', 'required', 'string', 'max:255'],
+            'subtitle' => ['sometimes', 'nullable', 'string'],
+            'intro' => ['sometimes', 'nullable', 'string'],
+            'description' => ['sometimes', 'nullable', 'string'],
+            'active' => ['sometimes', 'boolean'],
+            'website' => ['sometimes', 'nullable', 'url', 'max:255'],
+            'twitter_username' => ['sometimes', 'nullable', 'string', 'max:255'],
+            'nostr' => ['sometimes', 'nullable', 'string', 'max:255'],
+            'lightning_address' => ['sometimes', 'nullable', 'string', 'max:255'],
+            'lnurl' => ['sometimes', 'nullable', 'string'],
+            'node_id' => ['sometimes', 'nullable', 'string', 'max:255'],
+            'paynym' => ['sometimes', 'nullable', 'string'],
+            'team_id' => ['sometimes', 'nullable', 'integer', 'exists:teams,id'],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'team_id.exists' => 'Das angegebene Team existiert nicht.',
+        ];
+    }
+}
diff --git a/app/Http/Requests/Api/UpdateMeetupEventRequest.php b/app/Http/Requests/Api/UpdateMeetupEventRequest.php
new file mode 100644
index 0000000..7133fa0
--- /dev/null
+++ b/app/Http/Requests/Api/UpdateMeetupEventRequest.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Http\Requests\Api;
+
+use App\Enums\RecurrenceType;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class UpdateMeetupEventRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()->can('update', $this->route('meetupEvent'));
+    }
+
+    /**
+     * @return array<string, array<int, mixed>>
+     */
+    public function rules(): array
+    {
+        return [
+            'meetup_id' => ['sometimes', 'required', 'integer', 'exists:meetups,id'],
+            'start' => ['sometimes', 'required', 'date'],
+            'location' => ['sometimes', 'nullable', 'string', 'max:255'],
+            'description' => ['sometimes', 'nullable', 'string'],
+            'link' => ['sometimes', 'nullable', 'url', 'max:255'],
+            'recurrence_type' => ['sometimes', 'nullable', Rule::enum(RecurrenceType::class)],
+            'recurrence_day_of_week' => ['sometimes', 'nullable', 'string', 'max:255'],
+            'recurrence_day_position' => ['sometimes', 'nullable', 'string', 'max:255'],
+            'recurrence_interval' => ['sometimes', 'nullable', 'integer'],
+            'recurrence_end_date' => ['sometimes', 'nullable', 'date', 'after_or_equal:start'],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'meetup_id.exists' => 'Das angegebene Meetup existiert nicht.',
+        ];
+    }
+}
diff --git a/app/Http/Requests/Api/UpdateMeetupRequest.php b/app/Http/Requests/Api/UpdateMeetupRequest.php
new file mode 100644
index 0000000..51593b6
--- /dev/null
+++ b/app/Http/Requests/Api/UpdateMeetupRequest.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Http\Requests\Api;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdateMeetupRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()->can('update', $this->route('meetup'));
+    }
+
+    /**
+     * @return array<string, array<int, string>>
+     */
+    public function rules(): array
+    {
+        return [
+            'name' => ['sometimes', 'required', 'string', 'max:255'],
+            'city_id' => ['sometimes', 'required', 'integer', 'exists:cities,id'],
+            'intro' => ['sometimes', 'nullable', 'string'],
+            'telegram_link' => ['sometimes', 'nullable', 'url', 'max:255'],
+            'webpage' => ['sometimes', 'nullable', 'url', 'max:255'],
+            'twitter_username' => ['sometimes', 'nullable', 'string', 'max:255'],
+            'matrix_group' => ['sometimes', 'nullable', 'string', 'max:255'],
+            'nostr' => ['sometimes', 'nullable', 'string'],
+            'simplex' => ['sometimes', 'nullable', 'string'],
+            'signal' => ['sometimes', 'nullable', 'string', 'max:255'],
+            'community' => ['sometimes', 'nullable', 'string', 'max:255'],
+            'visible_on_map' => ['sometimes', 'boolean'],
+            'is_active' => ['sometimes', 'boolean'],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'city_id.exists' => 'Die angegebene Stadt existiert nicht.',
+        ];
+    }
+}
diff --git a/app/Http/Requests/Api/UpdateVenueRequest.php b/app/Http/Requests/Api/UpdateVenueRequest.php
new file mode 100644
index 0000000..3bfa2cb
--- /dev/null
+++ b/app/Http/Requests/Api/UpdateVenueRequest.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Http\Requests\Api;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdateVenueRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user()->can('update', $this->route('venue'));
+    }
+
+    /**
+     * @return array<string, array<int, string>>
+     */
+    public function rules(): array
+    {
+        return [
+            'city_id' => ['sometimes', 'required', 'integer', 'exists:cities,id'],
+            'name' => ['sometimes', 'required', 'string', 'max:255'],
+            'street' => ['sometimes', 'required', 'string', 'max:255'],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function messages(): array
+    {
+        return [
+            'city_id.exists' => 'Die angegebene Stadt existiert nicht.',
+        ];
+    }
+}
diff --git a/app/Http/Resources/CityResource.php b/app/Http/Resources/CityResource.php
new file mode 100644
index 0000000..faa1c26
--- /dev/null
+++ b/app/Http/Resources/CityResource.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Http\Resources;
+
+use App\Models\City;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/**
+ * @mixin City
+ */
+class CityResource extends JsonResource
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'country_id' => $this->country_id,
+            'name' => $this->name,
+            'slug' => $this->slug,
+            'longitude' => $this->longitude,
+            'latitude' => $this->latitude,
+            'population' => $this->population,
+            'created_by' => $this->created_by,
+            'created_at' => $this->created_at,
+            'updated_at' => $this->updated_at,
+        ];
+    }
+}
diff --git a/app/Http/Resources/LecturerResource.php b/app/Http/Resources/LecturerResource.php
new file mode 100644
index 0000000..ecfbd9b
--- /dev/null
+++ b/app/Http/Resources/LecturerResource.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Http\Resources;
+
+use App\Models\Lecturer;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/**
+ * @mixin Lecturer
+ */
+class LecturerResource extends JsonResource
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'name' => $this->name,
+            'slug' => $this->slug,
+            'subtitle' => $this->subtitle,
+            'intro' => $this->intro,
+            'description' => $this->description,
+            'active' => $this->active,
+            'website' => $this->website,
+            'twitter_username' => $this->twitter_username,
+            'nostr' => $this->nostr,
+            'lightning_address' => $this->lightning_address,
+            'lnurl' => $this->lnurl,
+            'node_id' => $this->node_id,
+            'paynym' => $this->paynym,
+            'team_id' => $this->team_id,
+            'created_by' => $this->created_by,
+            'created_at' => $this->created_at,
+            'updated_at' => $this->updated_at,
+        ];
+    }
+}
diff --git a/app/Http/Resources/MeetupEventResource.php b/app/Http/Resources/MeetupEventResource.php
new file mode 100644
index 0000000..612ec87
--- /dev/null
+++ b/app/Http/Resources/MeetupEventResource.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Http\Resources;
+
+use App\Models\MeetupEvent;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/**
+ * @mixin MeetupEvent
+ */
+class MeetupEventResource extends JsonResource
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'meetup_id' => $this->meetup_id,
+            'start' => $this->start,
+            'location' => $this->location,
+            'description' => $this->description,
+            'link' => $this->link,
+            'recurrence_type' => $this->recurrence_type,
+            'recurrence_day_of_week' => $this->recurrence_day_of_week,
+            'recurrence_day_position' => $this->recurrence_day_position,
+            'recurrence_interval' => $this->recurrence_interval,
+            'recurrence_end_date' => $this->recurrence_end_date,
+            'created_by' => $this->created_by,
+            'created_at' => $this->created_at,
+            'updated_at' => $this->updated_at,
+        ];
+    }
+}
diff --git a/app/Http/Resources/MeetupResource.php b/app/Http/Resources/MeetupResource.php
new file mode 100644
index 0000000..d9d10b7
--- /dev/null
+++ b/app/Http/Resources/MeetupResource.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Http\Resources;
+
+use App\Models\Meetup;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/**
+ * @mixin Meetup
+ */
+class MeetupResource extends JsonResource
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'name' => $this->name,
+            'slug' => $this->slug,
+            'city_id' => $this->city_id,
+            'intro' => $this->intro,
+            'telegram_link' => $this->telegram_link,
+            'webpage' => $this->webpage,
+            'twitter_username' => $this->twitter_username,
+            'matrix_group' => $this->matrix_group,
+            'nostr' => $this->nostr,
+            'simplex' => $this->simplex,
+            'signal' => $this->signal,
+            'community' => $this->community,
+            'visible_on_map' => $this->visible_on_map,
+            'is_active' => $this->is_active,
+            'last_event_at' => $this->last_event_at,
+            'created_by' => $this->created_by,
+            'created_at' => $this->created_at,
+            'updated_at' => $this->updated_at,
+        ];
+    }
+}
diff --git a/app/Http/Resources/VenueResource.php b/app/Http/Resources/VenueResource.php
new file mode 100644
index 0000000..6dcf44a
--- /dev/null
+++ b/app/Http/Resources/VenueResource.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Http\Resources;
+
+use App\Models\Venue;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/**
+ * @mixin Venue
+ */
+class VenueResource extends JsonResource
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'city_id' => $this->city_id,
+            'name' => $this->name,
+            'slug' => $this->slug,
+            'street' => $this->street,
+            'created_by' => $this->created_by,
+            'created_at' => $this->created_at,
+            'updated_at' => $this->updated_at,
+        ];
+    }
+}
diff --git a/app/Policies/CityPolicy.php b/app/Policies/CityPolicy.php
new file mode 100644
index 0000000..a6ac78e
--- /dev/null
+++ b/app/Policies/CityPolicy.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Policies;
+
+use App\Models\City;
+use App\Models\User;
+use App\Policies\Concerns\ChecksCreatorOwnership;
+
+class CityPolicy
+{
+    use ChecksCreatorOwnership;
+
+    public function viewAny(User $user): bool
+    {
+        return true;
+    }
+
+    public function view(User $user, City $city): bool
+    {
+        return $this->owns($user, $city);
+    }
+
+    public function create(User $user): bool
+    {
+        return true;
+    }
+
+    public function update(User $user, City $city): bool
+    {
+        return $this->owns($user, $city);
+    }
+}
diff --git a/app/Policies/Concerns/ChecksCreatorOwnership.php b/app/Policies/Concerns/ChecksCreatorOwnership.php
new file mode 100644
index 0000000..2ef97e1
--- /dev/null
+++ b/app/Policies/Concerns/ChecksCreatorOwnership.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Policies\Concerns;
+
+use App\Models\User;
+use Illuminate\Database\Eloquent\Model;
+
+trait ChecksCreatorOwnership
+{
+    /**
+     * Nur der urspruengliche Ersteller (created_by) oder ein Super-Admin darf das Model veraendern.
+     */
+    protected function owns(User $user, Model $model): bool
+    {
+        return (int) $model->created_by === $user->id || $user->hasRole('super-admin');
+    }
+}
diff --git a/app/Policies/LecturerPolicy.php b/app/Policies/LecturerPolicy.php
new file mode 100644
index 0000000..04575da
--- /dev/null
+++ b/app/Policies/LecturerPolicy.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Policies;
+
+use App\Models\Lecturer;
+use App\Models\User;
+use App\Policies\Concerns\ChecksCreatorOwnership;
+
+class LecturerPolicy
+{
+    use ChecksCreatorOwnership;
+
+    public function viewAny(User $user): bool
+    {
+        return true;
+    }
+
+    public function view(User $user, Lecturer $lecturer): bool
+    {
+        return $this->owns($user, $lecturer);
+    }
+
+    public function create(User $user): bool
+    {
+        return true;
+    }
+
+    public function update(User $user, Lecturer $lecturer): bool
+    {
+        return $this->owns($user, $lecturer);
+    }
+}
diff --git a/app/Policies/MeetupEventPolicy.php b/app/Policies/MeetupEventPolicy.php
new file mode 100644
index 0000000..21989a2
--- /dev/null
+++ b/app/Policies/MeetupEventPolicy.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Policies;
+
+use App\Models\MeetupEvent;
+use App\Models\User;
+use App\Policies\Concerns\ChecksCreatorOwnership;
+
+class MeetupEventPolicy
+{
+    use ChecksCreatorOwnership;
+
+    public function viewAny(User $user): bool
+    {
+        return true;
+    }
+
+    public function view(User $user, MeetupEvent $meetupEvent): bool
+    {
+        return $this->owns($user, $meetupEvent);
+    }
+
+    public function create(User $user): bool
+    {
+        return true;
+    }
+
+    public function update(User $user, MeetupEvent $meetupEvent): bool
+    {
+        return $this->owns($user, $meetupEvent);
+    }
+}
diff --git a/app/Policies/MeetupPolicy.php b/app/Policies/MeetupPolicy.php
new file mode 100644
index 0000000..9d07a0a
--- /dev/null
+++ b/app/Policies/MeetupPolicy.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Policies;
+
+use App\Models\Meetup;
+use App\Models\User;
+use App\Policies\Concerns\ChecksCreatorOwnership;
+
+class MeetupPolicy
+{
+    use ChecksCreatorOwnership;
+
+    public function viewAny(User $user): bool
+    {
+        return true;
+    }
+
+    public function view(User $user, Meetup $meetup): bool
+    {
+        return $this->owns($user, $meetup);
+    }
+
+    public function create(User $user): bool
+    {
+        return true;
+    }
+
+    public function update(User $user, Meetup $meetup): bool
+    {
+        return $this->owns($user, $meetup);
+    }
+}
diff --git a/app/Policies/VenuePolicy.php b/app/Policies/VenuePolicy.php
new file mode 100644
index 0000000..b4aa91a
--- /dev/null
+++ b/app/Policies/VenuePolicy.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Policies;
+
+use App\Models\User;
+use App\Models\Venue;
+use App\Policies\Concerns\ChecksCreatorOwnership;
+
+class VenuePolicy
+{
+    use ChecksCreatorOwnership;
+
+    public function viewAny(User $user): bool
+    {
+        return true;
+    }
+
+    public function view(User $user, Venue $venue): bool
+    {
+        return $this->owns($user, $venue);
+    }
+
+    public function create(User $user): bool
+    {
+        return true;
+    }
+
+    public function update(User $user, Venue $venue): bool
+    {
+        return $this->owns($user, $venue);
+    }
+}
diff --git a/config/scramble.php b/config/scramble.php
index 8be79ea..455e8fe 100644
--- a/config/scramble.php
+++ b/config/scramble.php
@@ -43,7 +43,7 @@ return [
          */
         'description' => <<<'MARKDOWN'
         Willkommen bei der **Einundzwanzig API** – der öffentlichen Schnittstelle der
-        [Einundzwanzig](https://einundzwanzig.space) Bitcoin-Community-Plattform.
+        [Einundzwanzig](https://portal.einundzwanzig.space) Bitcoin-Community-Plattform.
 
         Über diese API erreichst du die Daten der dezentralen deutschsprachigen Bitcoin-Bewegung:
         Meetups und ihre Termine, Kurse und Kurs-Events, Referenten, Veranstaltungsorte sowie die
@@ -117,7 +117,7 @@ return [
      * ```
      */
     'servers' => [
-        'Production' => 'https://einundzwanzig.space/api',
+        'Production' => 'https://portal.einundzwanzig.space/api',
         'Local' => 'api',
     ],
 
diff --git a/routes/api.php b/routes/api.php
index a25c74f..4aba8f0 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -17,14 +17,14 @@ use Illuminate\Support\Facades\Route;
 Route::middleware(['throttle:60,1'])
     ->as('api.')
     ->group(function () {
-        Route::resource('countries', CountryController::class);
+        Route::resource('countries', CountryController::class)->only(['index']);
         Route::get('meetup/ical', [MeetupController::class, 'ical'])->name('api.meetup.ical');
-        Route::resource('meetup', MeetupController::class);
-        Route::resource('lecturers', LecturerController::class);
+        Route::resource('meetup', MeetupController::class)->only(['index']);
+        Route::resource('lecturers', LecturerController::class)->only(['index']);
         Route::resource('courses', CourseController::class)
             ->only(['index', 'show']);
-        Route::resource('cities', CityController::class);
-        Route::resource('venues', VenueController::class);
+        Route::resource('cities', CityController::class)->only(['index']);
+        Route::resource('venues', VenueController::class)->only(['index']);
         Route::get('nostrplebs', NostrPlebController::class);
         Route::get('meetups', MeetupMapController::class);
         Route::get('meetup-events/{date?}', MeetupEventController::class);
@@ -50,6 +50,31 @@ Route::middleware('auth:sanctum')
             ->name('course-events.store');
         Route::patch('course-events/{courseEvent}', [CourseEventController::class, 'update'])
             ->name('course-events.update');
+
+        Route::post('lecturers', [LecturerController::class, 'store'])->name('lecturers.store');
+        Route::patch('lecturers/{lecturer}', [LecturerController::class, 'update'])->name('lecturers.update');
+        Route::get('my-lecturers', [LecturerController::class, 'mine'])->name('lecturers.mine');
+        Route::get('my-lecturers/{lecturer}', [LecturerController::class, 'mineShow'])->name('lecturers.mine.show');
+
+        Route::post('venues', [VenueController::class, 'store'])->name('venues.store');
+        Route::patch('venues/{venue}', [VenueController::class, 'update'])->name('venues.update');
+        Route::get('my-venues', [VenueController::class, 'mine'])->name('venues.mine');
+        Route::get('my-venues/{venue}', [VenueController::class, 'mineShow'])->name('venues.mine.show');
+
+        Route::post('cities', [CityController::class, 'store'])->name('cities.store');
+        Route::patch('cities/{city}', [CityController::class, 'update'])->name('cities.update');
+        Route::get('my-cities', [CityController::class, 'mine'])->name('cities.mine');
+        Route::get('my-cities/{city}', [CityController::class, 'mineShow'])->name('cities.mine.show');
+
+        Route::post('meetup', [MeetupController::class, 'store'])->name('meetup.store');
+        Route::patch('meetup/{meetup}', [MeetupController::class, 'update'])->name('meetup.update');
+        Route::get('my-meetups', [MeetupController::class, 'mine'])->name('meetup.mine');
+        Route::get('my-meetups/{meetup}', [MeetupController::class, 'mineShow'])->name('meetup.mine.show');
+
+        Route::post('meetup-events', [MeetupEventController::class, 'store'])->name('meetup-events.store');
+        Route::patch('meetup-events/{meetupEvent}', [MeetupEventController::class, 'update'])->name('meetup-events.update');
+        Route::get('my-meetup-events', [MeetupEventController::class, 'mine'])->name('meetup-events.mine');
+        Route::get('my-meetup-events/{meetupEvent}', [MeetupEventController::class, 'mineShow'])->name('meetup-events.mine.show');
     });
 
 Route::get('/lnurl-auth-callback', [LnurlAuthController::class, 'callback'])
diff --git a/tests/Feature/Api/CityWriteApiTest.php b/tests/Feature/Api/CityWriteApiTest.php
new file mode 100644
index 0000000..ba4450b
--- /dev/null
+++ b/tests/Feature/Api/CityWriteApiTest.php
@@ -0,0 +1,93 @@
+<?php
+
+use App\Models\City;
+use App\Models\Country;
+use App\Models\User;
+use Laravel\Sanctum\Sanctum;
+
+it('rejects a guest', function () {
+    $response = $this->postJson('/api/cities', [
+        'name' => 'Ansbach',
+        'country_id' => Country::factory()->create()->id,
+    ]);
+
+    $response->assertUnauthorized();
+});
+
+it('lets an authenticated user create', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+
+    $response = $this->postJson('/api/cities', [
+        'name' => 'Ansbach',
+        'country_id' => Country::factory()->create()->id,
+        'longitude' => 10.5806,
+        'latitude' => 49.3034,
+    ]);
+
+    $response->assertCreated();
+
+    $this->assertDatabaseHas('cities', [
+        'name' => 'Ansbach',
+        'created_by' => $user->id,
+    ]);
+});
+
+it('fails validation', function () {
+    Sanctum::actingAs(User::factory()->create());
+
+    $response = $this->postJson('/api/cities', []);
+
+    $response->assertUnprocessable()
+        ->assertJsonValidationErrors(['name', 'country_id']);
+});
+
+it('lets the owner update', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+
+    $model = City::factory()->create(['created_by' => $user->id]);
+
+    $response = $this->patchJson("/api/cities/{$model->id}", [
+        'name' => 'Nürnberg',
+    ]);
+
+    $response->assertSuccessful()
+        ->assertJsonPath('data.name', 'Nürnberg');
+});
+
+it('forbids updating someone elses', function () {
+    $owner = User::factory()->create();
+    $model = City::factory()->create(['created_by' => $owner->id]);
+
+    Sanctum::actingAs(User::factory()->create());
+
+    $response = $this->patchJson("/api/cities/{$model->id}", [
+        'name' => 'Nürnberg',
+    ]);
+
+    $response->assertForbidden();
+});
+
+it('returns only own in mine index', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+
+    City::factory()->create(['created_by' => $user->id]);
+    City::factory()->create(['created_by' => $user->id]);
+    City::factory()->create(['created_by' => User::factory()->create()->id]);
+
+    $response = $this->getJson('/api/my-cities');
+
+    $response->assertSuccessful();
+
+    expect($response->json('data'))->toHaveCount(2);
+});
+
+it('forbids viewing someone elses in mine show', function () {
+    $owner = User::factory()->create();
+    $model = City::factory()->create(['created_by' => $owner->id]);
+
+    Sanctum::actingAs(User::factory()->create());
+
+    $response = $this->getJson("/api/my-cities/{$model->id}");
+
+    $response->assertForbidden();
+});
diff --git a/tests/Feature/Api/LecturerWriteApiTest.php b/tests/Feature/Api/LecturerWriteApiTest.php
new file mode 100644
index 0000000..6a7dc08
--- /dev/null
+++ b/tests/Feature/Api/LecturerWriteApiTest.php
@@ -0,0 +1,82 @@
+<?php
+
+use App\Models\Lecturer;
+use App\Models\User;
+use Laravel\Sanctum\Sanctum;
+
+it('rejects a guest', function () {
+    $this->postJson('/api/lecturers', [
+        'name' => 'Saifedean Ammous',
+    ])->assertUnauthorized();
+});
+
+it('lets an authenticated user create', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+
+    $this->postJson('/api/lecturers', [
+        'name' => 'Saifedean Ammous',
+    ])
+        ->assertCreated()
+        ->assertJsonPath('data.name', 'Saifedean Ammous');
+
+    $this->assertDatabaseHas('lecturers', [
+        'name' => 'Saifedean Ammous',
+        'created_by' => $user->id,
+    ]);
+});
+
+it('fails validation', function () {
+    Sanctum::actingAs(User::factory()->create());
+
+    $this->postJson('/api/lecturers', [])
+        ->assertUnprocessable()
+        ->assertJsonValidationErrors(['name']);
+});
+
+it('lets the owner update', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+    $lecturer = Lecturer::factory()->create(['created_by' => $user->id]);
+
+    $this->patchJson('/api/lecturers/'.$lecturer->id, [
+        'name' => 'Knut Svanholm',
+    ])
+        ->assertSuccessful()
+        ->assertJsonPath('data.name', 'Knut Svanholm');
+});
+
+it('forbids updating someone elses', function () {
+    $owner = User::factory()->create();
+    $lecturer = Lecturer::factory()->create(['created_by' => $owner->id]);
+
+    Sanctum::actingAs(User::factory()->create());
+
+    $this->patchJson('/api/lecturers/'.$lecturer->id, [
+        'name' => 'Knut Svanholm',
+    ])->assertForbidden();
+});
+
+it('returns only own in mine index', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+    $other = User::factory()->create();
+
+    Lecturer::factory()->count(2)->create(['created_by' => $user->id]);
+    Lecturer::factory()->create(['created_by' => $other->id]);
+
+    $response = $this->getJson('/api/my-lecturers');
+
+    $response->assertSuccessful();
+    expect($response->json('data'))->toHaveCount(2);
+    collect($response->json('data'))->each(
+        fn ($lecturer) => expect($lecturer['created_by'])->toBe($user->id)
+    );
+});
+
+it('forbids viewing someone elses in mine show', function () {
+    $owner = User::factory()->create();
+    $lecturer = Lecturer::factory()->create(['created_by' => $owner->id]);
+
+    Sanctum::actingAs(User::factory()->create());
+
+    $this->getJson('/api/my-lecturers/'.$lecturer->id)
+        ->assertForbidden();
+});
diff --git a/tests/Feature/Api/MeetupEventWriteApiTest.php b/tests/Feature/Api/MeetupEventWriteApiTest.php
new file mode 100644
index 0000000..e09ea6e
--- /dev/null
+++ b/tests/Feature/Api/MeetupEventWriteApiTest.php
@@ -0,0 +1,88 @@
+<?php
+
+use App\Models\Meetup;
+use App\Models\MeetupEvent;
+use App\Models\User;
+use Laravel\Sanctum\Sanctum;
+
+it('rejects a guest', function () {
+    $response = $this->postJson('/api/meetup-events', []);
+
+    $response->assertUnauthorized();
+});
+
+it('lets an authenticated user create', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+
+    $response = $this->postJson('/api/meetup-events', [
+        'meetup_id' => Meetup::factory()->create()->id,
+        'start' => '2026-08-01 18:00:00',
+        'location' => 'Marktplatz',
+    ]);
+
+    $response->assertCreated();
+
+    $this->assertDatabaseHas('meetup_events', [
+        'location' => 'Marktplatz',
+        'created_by' => $user->id,
+    ]);
+});
+
+it('fails validation', function () {
+    Sanctum::actingAs(User::factory()->create());
+
+    $response = $this->postJson('/api/meetup-events', []);
+
+    $response->assertUnprocessable()
+        ->assertJsonValidationErrors(['meetup_id', 'start']);
+});
+
+it('lets the owner update', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+
+    $model = MeetupEvent::factory()->create(['created_by' => $user->id]);
+
+    $response = $this->patchJson("/api/meetup-events/{$model->id}", [
+        'location' => 'Rathaus',
+    ]);
+
+    $response->assertSuccessful()
+        ->assertJsonPath('data.location', 'Rathaus');
+});
+
+it('forbids updating someone elses', function () {
+    $owner = User::factory()->create();
+    $model = MeetupEvent::factory()->create(['created_by' => $owner->id]);
+
+    Sanctum::actingAs(User::factory()->create());
+
+    $response = $this->patchJson("/api/meetup-events/{$model->id}", [
+        'location' => 'Rathaus',
+    ]);
+
+    $response->assertForbidden();
+});
+
+it('returns only own in mine index', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+
+    MeetupEvent::factory()->count(2)->create(['created_by' => $user->id]);
+    MeetupEvent::factory()->create(['created_by' => User::factory()->create()->id]);
+
+    $response = $this->getJson('/api/my-meetup-events');
+
+    $response->assertSuccessful();
+
+    expect($response->json('data'))->toHaveCount(2);
+});
+
+it('forbids viewing someone elses in mine show', function () {
+    $owner = User::factory()->create();
+    $model = MeetupEvent::factory()->create(['created_by' => $owner->id]);
+
+    Sanctum::actingAs(User::factory()->create());
+
+    $response = $this->getJson("/api/my-meetup-events/{$model->id}");
+
+    $response->assertForbidden();
+});
diff --git a/tests/Feature/Api/MeetupWriteApiTest.php b/tests/Feature/Api/MeetupWriteApiTest.php
new file mode 100644
index 0000000..ef74f37
--- /dev/null
+++ b/tests/Feature/Api/MeetupWriteApiTest.php
@@ -0,0 +1,84 @@
+<?php
+
+use App\Models\City;
+use App\Models\Meetup;
+use App\Models\User;
+use Laravel\Sanctum\Sanctum;
+
+it('rejects a guest', function () {
+    $this->postJson('/api/meetup', [
+        'name' => 'Einundzwanzig Ansbach',
+        'city_id' => City::factory()->create()->id,
+    ])->assertUnauthorized();
+});
+
+it('lets an authenticated user create', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+
+    $this->postJson('/api/meetup', [
+        'name' => 'Einundzwanzig Ansbach',
+        'city_id' => City::factory()->create()->id,
+    ])
+        ->assertCreated()
+        ->assertJsonPath('data.name', 'Einundzwanzig Ansbach');
+
+    $this->assertDatabaseHas('meetups', [
+        'name' => 'Einundzwanzig Ansbach',
+        'created_by' => $user->id,
+    ]);
+});
+
+it('fails validation', function () {
+    Sanctum::actingAs(User::factory()->create());
+
+    $this->postJson('/api/meetup', [])
+        ->assertUnprocessable()
+        ->assertJsonValidationErrors(['name', 'city_id']);
+});
+
+it('lets the owner update', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+    $meetup = Meetup::factory()->create(['created_by' => $user->id]);
+
+    $this->patchJson('/api/meetup/'.$meetup->id, [
+        'name' => 'Plan B Lugano',
+    ])
+        ->assertSuccessful()
+        ->assertJsonPath('data.name', 'Plan B Lugano');
+});
+
+it('forbids updating someone elses', function () {
+    $owner = User::factory()->create();
+    $meetup = Meetup::factory()->create(['created_by' => $owner->id]);
+
+    Sanctum::actingAs(User::factory()->create());
+
+    $this->patchJson('/api/meetup/'.$meetup->id, [
+        'name' => 'Plan B Lugano',
+    ])->assertForbidden();
+});
+
+it('returns only own in mine index', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+    $other = User::factory()->create();
+
+    Meetup::factory()->count(2)->create(['created_by' => $user->id]);
+    Meetup::factory()->create(['created_by' => $other->id]);
+
+    $response = $this->getJson('/api/my-meetups');
+
+    $response->assertSuccessful();
+    expect($response->json('data'))->toHaveCount(2);
+    collect($response->json('data'))->each(
+        fn ($meetup) => expect($meetup['created_by'])->toBe($user->id)
+    );
+});
+
+it('forbids viewing someone elses in mine show', function () {
+    $owner = User::factory()->create();
+    $meetup = Meetup::factory()->create(['created_by' => $owner->id]);
+
+    Sanctum::actingAs(User::factory()->create());
+
+    $this->getJson('/api/my-meetups/'.$meetup->id)->assertForbidden();
+});
diff --git a/tests/Feature/Api/VenueWriteApiTest.php b/tests/Feature/Api/VenueWriteApiTest.php
new file mode 100644
index 0000000..0300a87
--- /dev/null
+++ b/tests/Feature/Api/VenueWriteApiTest.php
@@ -0,0 +1,83 @@
+<?php
+
+use App\Models\City;
+use App\Models\User;
+use App\Models\Venue;
+use Laravel\Sanctum\Sanctum;
+
+it('rejects a guest', function () {
+    $this->postJson('/api/venues', [
+        'name' => 'Bitcoin Hub',
+        'city_id' => City::factory()->create()->id,
+    ])->assertUnauthorized();
+});
+
+it('lets an authenticated user create', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+
+    $this->postJson('/api/venues', [
+        'name' => 'Bitcoin Hub',
+        'city_id' => City::factory()->create()->id,
+        'street' => 'Satoshi Street 21',
+    ])->assertCreated();
+
+    $this->assertDatabaseHas('venues', [
+        'name' => 'Bitcoin Hub',
+        'created_by' => $user->id,
+    ]);
+});
+
+it('fails validation', function () {
+    Sanctum::actingAs(User::factory()->create());
+
+    $this->postJson('/api/venues', [])
+        ->assertUnprocessable()
+        ->assertJsonValidationErrors(['name', 'city_id']);
+});
+
+it('lets the owner update', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+    $model = Venue::factory()->create(['created_by' => $user->id]);
+
+    $this->patchJson('/api/venues/'.$model->id, [
+        'name' => 'Orange Hub',
+    ])
+        ->assertSuccessful()
+        ->assertJsonPath('data.name', 'Orange Hub');
+});
+
+it('forbids updating someone elses', function () {
+    $owner = User::factory()->create();
+    $model = Venue::factory()->create(['created_by' => $owner->id]);
+
+    Sanctum::actingAs(User::factory()->create());
+
+    $this->patchJson('/api/venues/'.$model->id, [
+        'name' => 'Orange Hub',
+    ])->assertForbidden();
+});
+
+it('returns only own in mine index', function () {
+    Sanctum::actingAs($user = User::factory()->create());
+    $other = User::factory()->create();
+
+    Venue::factory()->count(2)->create(['created_by' => $user->id]);
+    Venue::factory()->create(['created_by' => $other->id]);
+
+    $response = $this->getJson('/api/my-venues');
+
+    $response->assertSuccessful();
+    expect($response->json('data'))->toHaveCount(2);
+    collect($response->json('data'))->each(
+        fn ($venue) => expect($venue['created_by'])->toBe($user->id)
+    );
+});
+
+it('forbids viewing someone elses in mine show', function () {
+    $owner = User::factory()->create();
+    $model = Venue::factory()->create(['created_by' => $owner->id]);
+
+    Sanctum::actingAs(User::factory()->create());
+
+    $this->getJson('/api/my-venues/'.$model->id)->assertForbidden();
+});