diff --git a/app/app/Services/Project/ProjectService.php b/app/app/Services/Project/ProjectService.php
index c2e798f7..24317d58 100644
--- a/app/app/Services/Project/ProjectService.php
+++ b/app/app/Services/Project/ProjectService.php
@@ -213,6 +213,56 @@ class ProjectService
         return ['updated' => $updated, 'skipped' => $skipped, 'warnings' => []];
     }
 
+    private function assertNameUnique(int $tenantId, string $name, ?int $exceptId = null): void
+    {
+        $q = Project::where('tenant_id', $tenantId)->where('name', $name);
+        if ($exceptId !== null) {
+            $q->where('id', '!=', $exceptId);
+        }
+        if ($q->exists()) {
+            throw new HttpResponseException(response()->json([
+                'errors' => ['name' => ['Проект с таким названием у вас уже есть. Выберите другое название.']],
+            ], 422));
+        }
+    }
+
+    /** @param array<string,mixed> $data */
+    private function assertSourceUnique(int $tenantId, array $data, ?int $exceptId = null): void
+    {
+        $signalType = $data['signal_type'] ?? null;
+        $q = Project::where('tenant_id', $tenantId)->where('signal_type', $signalType);
+        if ($exceptId !== null) {
+            $q->where('id', '!=', $exceptId);
+        }
+
+        if (in_array($signalType, ['call', 'site'], true)) {
+            $identifier = (string) ($data['signal_identifier'] ?? '');
+            if ($identifier === '') {
+                return;
+            }
+            $q->where('signal_identifier', $identifier);
+        } elseif ($signalType === 'sms') {
+            $senders = (array) ($data['sms_senders'] ?? []);
+            $norm = collect($senders)->map(fn ($s) => mb_strtolower(trim((string) $s)))->sort()->values()->all();
+            if ($norm === []) {
+                return;
+            }
+            $keyword = $data['sms_keyword'] ?? null;
+            $q->where('sms_keyword', $keyword)
+                ->whereJsonContains('sms_senders', $norm)
+                ->whereRaw('jsonb_array_length(sms_senders::jsonb) = ?', [count($norm)]);
+        } else {
+            return;
+        }
+
+        $existing = $q->first();
+        if ($existing !== null) {
+            throw new HttpResponseException(response()->json([
+                'errors' => ['signal_identifier' => ["У вас уже есть проект с этим источником: «{$existing->name}»."]],
+            ], 422));
+        }
+    }
+
     public function create(Tenant $tenant, array $data): Project
     {
         $limit = (int) ($tenant->limits['max_projects'] ?? 10);
@@ -230,6 +280,10 @@ class ProjectService
         // PhonePrefixService / LeadRouter, удаляются в Plan 6.5 после переключения читателей.
         $data['region_mask'] = 255;
         $data['region_mode'] = 'include';
+
+        $this->assertNameUnique($tenant->id, (string) $data['name']);
+        $this->assertSourceUnique($tenant->id, $data);
+
         $project = Project::create($data);
 
         SyncSupplierProjectJob::dispatch($project->id);
diff --git a/app/phpstan-baseline.neon b/app/phpstan-baseline.neon
index e3356923..f1c480f9 100644
--- a/app/phpstan-baseline.neon
+++ b/app/phpstan-baseline.neon
@@ -2105,3 +2105,21 @@ parameters:
 			identifier: argument.type
 			count: 1
 			path: tests/Unit/Supplier/SupplierQuotaAllocatorTest.php
+
+		-
+			message: '#^Access to an undefined property Pest\\PendingCalls\\TestCall\:\:\$tenant\.$#'
+			identifier: property.notFound
+			count: 6
+			path: tests/Feature/Project/ProjectCreateDedupTest.php
+
+		-
+			message: '#^Call to an undefined method Pest\\PendingCalls\\TestCall\:\:fail\(\)\.$#'
+			identifier: method.notFound
+			count: 1
+			path: tests/Feature/Project/ProjectCreateDedupTest.php
+
+		-
+			message: '#^Call to an undefined method Symfony\\Component\\HttpFoundation\\Response\:\:getData\(\)\.$#'
+			identifier: method.notFound
+			count: 1
+			path: tests/Feature/Project/ProjectCreateDedupTest.php
diff --git a/app/tests/Feature/Project/ProjectCreateDedupTest.php b/app/tests/Feature/Project/ProjectCreateDedupTest.php
new file mode 100644
index 00000000..909dbfe9
--- /dev/null
+++ b/app/tests/Feature/Project/ProjectCreateDedupTest.php
@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Models\Project;
+use App\Models\Tenant;
+use App\Services\Project\ProjectService;
+use Illuminate\Http\Exceptions\HttpResponseException;
+
+beforeEach(function () {
+    $this->tenant = Tenant::factory()->create(['balance_leads' => 100]);
+});
+
+function makeCall(array $over = []): array
+{
+    return array_merge([
+        'name' => 'Проект A', 'signal_type' => 'call', 'signal_identifier' => '79991110000',
+        'daily_limit_target' => 5, 'regions' => [], 'delivery_days_mask' => 31,
+    ], $over);
+}
+
+it('blocks duplicate source within tenant with human message', function () {
+    app(ProjectService::class)->create($this->tenant, makeCall());
+    expect(fn () => app(ProjectService::class)
+        ->create($this->tenant, makeCall(['name' => 'Проект B'])))
+        ->toThrow(HttpResponseException::class);
+});
+
+it('allows same source for a different tenant (sharing)', function () {
+    $other = Tenant::factory()->create(['balance_leads' => 100]);
+    app(ProjectService::class)->create($this->tenant, makeCall());
+    $p = app(ProjectService::class)->create($other, makeCall(['name' => 'Проект B']));
+    expect($p)->toBeInstanceOf(Project::class);
+});
+
+it('blocks duplicate name within tenant with human message (not SQL)', function () {
+    app(ProjectService::class)->create($this->tenant, makeCall());
+    try {
+        app(ProjectService::class)
+            ->create($this->tenant, makeCall(['name' => 'Проект A', 'signal_identifier' => '79992220000']));
+        $this->fail('expected HttpResponseException');
+    } catch (HttpResponseException $e) {
+        $body = $e->getResponse()->getData(true);
+        expect($body['errors']['name'][0] ?? '')->not->toContain('SQLSTATE');
+    }
+});