diff --git a/app/Services/Inventory/DependencyExtractionService.php b/app/Services/Inventory/DependencyExtractionService.php
index b197564..46e7119 100644
--- a/app/Services/Inventory/DependencyExtractionService.php
+++ b/app/Services/Inventory/DependencyExtractionService.php
@@ -25,6 +25,17 @@ public function extractForPolicyData(InventoryItem $item, array $policyData): ar
         $edges = $edges->merge($this->extractAssignments($item, $policyData, $warnings));
         $edges = $edges->merge($this->extractScopedBy($item, $policyData));
 
+        $edges = $edges
+            ->unique(fn (array $e) => implode('|', [
+                (string) ($e['tenant_id'] ?? ''),
+                (string) ($e['source_type'] ?? ''),
+                (string) ($e['source_id'] ?? ''),
+                (string) ($e['target_type'] ?? ''),
+                (string) ($e['target_id'] ?? ''),
+                (string) ($e['relationship_type'] ?? ''),
+            ]))
+            ->values();
+
         // Enforce max 50 outbound edges by priority: assigned_to > scoped_by > others
         $priorities = [
             RelationshipType::AssignedToInclude->value => 1,
diff --git a/tests/Unit/DependencyExtractionServiceTest.php b/tests/Unit/DependencyExtractionServiceTest.php
index f0f83de..fc9173e 100644
--- a/tests/Unit/DependencyExtractionServiceTest.php
+++ b/tests/Unit/DependencyExtractionServiceTest.php
@@ -80,3 +80,35 @@
             && ($context['policy_id'] ?? null) === $item->external_id)
         ->once();
 });
+
+it('deduplicates edges before upsert to avoid conflict errors', function () {
+    $tenant = \App\Models\Tenant::factory()->create();
+
+    $item = \App\Models\InventoryItem::factory()->create([
+        'tenant_id' => $tenant->getKey(),
+        'policy_type' => 'settingsCatalogPolicy',
+        'external_id' => 'pol-dup-1',
+    ]);
+
+    $svc = app(\App\Services\Inventory\DependencyExtractionService::class);
+
+    $policyData = [
+        'id' => 'pol-dup-1',
+        'assignments' => [
+            ['target' => ['groupId' => 'group-1', '@odata.type' => '#microsoft.graph.groupAssignmentTarget']],
+            ['target' => ['groupId' => 'group-1', '@odata.type' => '#microsoft.graph.groupAssignmentTarget']],
+        ],
+        'roleScopeTagIds' => ['0', '0'],
+    ];
+
+    $warnings = $svc->extractForPolicyData($item, $policyData);
+    expect($warnings)->toBeArray()->toBeEmpty();
+
+    $edges = \App\Models\InventoryLink::query()
+        ->where('tenant_id', $tenant->getKey())
+        ->where('source_id', 'pol-dup-1')
+        ->get();
+
+    expect($edges->where('relationship_type', 'assigned_to_include'))->toHaveCount(1);
+    expect($edges->where('relationship_type', 'scoped_by'))->toHaveCount(1);
+});