diff --git a/database/migrations/2026_02_07_002108_alter_inventory_links_ids_to_text.php b/database/migrations/2026_02_07_002108_alter_inventory_links_ids_to_text.php
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+++ b/database/migrations/2026_02_07_002108_alter_inventory_links_ids_to_text.php
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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        $driver = DB::getDriverName();
+
+        if ($driver !== 'pgsql') {
+            // SQLite doesn't enforce UUID types; other drivers are not supported in this app.
+            return;
+        }
+
+        DB::statement('ALTER TABLE inventory_links ALTER COLUMN source_id TYPE text USING source_id::text');
+        DB::statement('ALTER TABLE inventory_links ALTER COLUMN target_id TYPE text USING target_id::text');
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        $driver = DB::getDriverName();
+
+        if ($driver !== 'pgsql') {
+            return;
+        }
+
+        // Best-effort rollback: non-UUID identifiers are coerced.
+        $uuidRegex = '^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$';
+        $sentinel = '00000000-0000-0000-0000-000000000000';
+
+        DB::statement(
+            "ALTER TABLE inventory_links ALTER COLUMN source_id TYPE uuid USING (CASE WHEN source_id ~* '{$uuidRegex}' THEN source_id::uuid ELSE '{$sentinel}'::uuid END)"
+        );
+
+        DB::statement(
+            "ALTER TABLE inventory_links ALTER COLUMN target_id TYPE uuid USING (CASE WHEN target_id IS NULL THEN NULL WHEN target_id ~* '{$uuidRegex}' THEN target_id::uuid ELSE NULL END)"
+        );
+    }
+};
diff --git a/specs/079-inventory-links-non-uuid-ids/plan.md b/specs/079-inventory-links-non-uuid-ids/plan.md
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+++ b/specs/079-inventory-links-non-uuid-ids/plan.md
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+# Plan: Inventory links support non-UUID IDs
+
+**Branch**: `079-inventory-links-non-uuid-ids`
+**Date**: 2026-02-07
+
+## Approach
+
+- Add a PostgreSQL migration to change `inventory_links.source_id` and `inventory_links.target_id` from `uuid` to `text`.
+- Add a pgsql-specific test that asserts the column types are `text` and that upserting an edge with a non-UUID `target_id` does not error.
+
+## Safety
+
+- Change is limited to `inventory_links` columns only.
+- Unique constraint and indexes continue to function on `text` columns.
+
+## Testing
+
+- Pest feature test under `tests/Feature/Inventory/`.
+- Run focused test + existing inventory extraction tests.
diff --git a/specs/079-inventory-links-non-uuid-ids/spec.md b/specs/079-inventory-links-non-uuid-ids/spec.md
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+++ b/specs/079-inventory-links-non-uuid-ids/spec.md
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+# Spec 079: Inventory links support non-UUID IDs
+
+**Date**: 2026-02-07
+
+## Problem
+
+Inventory dependency extraction writes edges into `inventory_links`. Some Microsoft Graph / Intune identifiers (notably scope tag IDs) can be non-UUID strings (e.g. `"0"`). The current schema defines `inventory_links.source_id` and `inventory_links.target_id` as UUID columns, causing PostgreSQL failures when non-UUID identifiers are inserted.
+
+## Goal
+
+Allow storing non-UUID identifiers in `inventory_links` without crashing inventory sync/extraction.
+
+## Requirements
+
+- `inventory_links.source_id` and `inventory_links.target_id` must accept arbitrary string identifiers.
+- Existing UUID identifiers must continue to work.
+- Behavior must be covered by tests.
+
+## Non-goals
+
+- No redesign of the dependency graph model.
+- No UI/Filament changes.
diff --git a/specs/079-inventory-links-non-uuid-ids/tasks.md b/specs/079-inventory-links-non-uuid-ids/tasks.md
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+++ b/specs/079-inventory-links-non-uuid-ids/tasks.md
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+# Tasks: Inventory links support non-UUID IDs
+
+## Phase 1: Spec + setup
+
+- [X] T001 Create spec folder and docs
+
+## Phase 2: Tests (TDD)
+
+- [X] T002 Add pgsql schema regression test in `tests/Feature/Inventory/InventoryLinksNonUuidIdsTest.php`
+
+## Phase 3: Implementation
+
+- [X] T003 Add migration to change `inventory_links.source_id` + `target_id` to `text` on PostgreSQL
+
+## Phase 4: Validation
+
+- [X] T004 Run tests: `vendor/bin/sail artisan test --compact tests/Feature/Inventory/InventoryLinksNonUuidIdsTest.php`
+- [X] T005 Run Pint: `vendor/bin/sail bin pint --dirty`
diff --git a/tests/Feature/Inventory/InventoryLinksNonUuidIdsTest.php b/tests/Feature/Inventory/InventoryLinksNonUuidIdsTest.php
new file mode 100644
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+++ b/tests/Feature/Inventory/InventoryLinksNonUuidIdsTest.php
@@ -0,0 +1,46 @@
+<?php
+
+use App\Models\InventoryItem;
+use App\Models\InventoryLink;
+use App\Models\Tenant;
+use App\Services\Inventory\DependencyExtractionService;
+use App\Support\Enums\RelationshipType;
+use Illuminate\Support\Facades\DB;
+
+it('stores non-UUID identifiers in inventory_links on PostgreSQL', function () {
+    $driver = DB::getDriverName();
+
+    $tenant = Tenant::factory()->create();
+    $item = InventoryItem::factory()->for($tenant)->create([
+        'external_id' => '11111111-1111-1111-1111-111111111111',
+    ]);
+
+    /** @var DependencyExtractionService $service */
+    $service = app(DependencyExtractionService::class);
+
+    $service->extractForPolicyData($item, [
+        'id' => $item->external_id,
+        'roleScopeTagIds' => ['0'],
+        'assignments' => [],
+    ]);
+
+    if ($driver === 'pgsql') {
+        $columnTypes = collect(DB::select(
+            "select column_name, data_type from information_schema.columns where table_name = 'inventory_links' and column_name in ('source_id', 'target_id')"
+        ))
+            ->mapWithKeys(fn (object $row) => [(string) $row->column_name => (string) $row->data_type]);
+
+        expect($columnTypes->get('source_id'))->toBe('text')
+            ->and($columnTypes->get('target_id'))->toBe('text');
+    }
+
+    expect(
+        InventoryLink::query()
+            ->where('tenant_id', $tenant->getKey())
+            ->where('source_type', 'inventory_item')
+            ->where('source_id', $item->external_id)
+            ->where('relationship_type', RelationshipType::ScopedBy->value)
+            ->where('target_id', '0')
+            ->exists()
+    )->toBeTrue();
+});