fix(machines) : pièce supprimée ne bloque plus la machine

Un lien machine_piece_links orphelin (pieceid pointant vers une pièce
supprimée) faisait charger les documents via l'id du lien
(GET /documents/piece/{linkId}) → 404 + toast bloquant, et la catégorie
restait affichée à vide.

- front : useEntityDocuments ne charge plus les documents pour un node
  pending (refreshDocuments + ensureDocumentsLoaded) + test
- back : migration Version20260529150000 réparant les 2 FK CASCADE vers
  pieces (fk_mpl_piece, fk_cfv_piece) jamais appliquées par
  Version20260528090000, avec nettoyage des orphelins (1 mpl + 3 cfv)

frontend/app/composables/useEntityDocuments.ts

@@ -56,7 +56,9 @@ export function useEntityDocuments(deps: EntityDocumentsDeps) {
   // CRUD operations
   const refreshDocuments = async () => {
     const e = entity()
-    if (!e?.id || e._structurePiece) return
+    // Pending / category-only nodes carry the link id (not a real entity id) and
+    // have no backing piece/composant — never request documents for them.
+    if (!e?.id || e._structurePiece || e.pendingEntity) return
     loadingDocuments.value = true
     try {
       const result: any = await loadDocumentsFn(e.id, { updateStore: false })
@@ -70,7 +72,8 @@ export function useEntityDocuments(deps: EntityDocumentsDeps) {
   }
 
   const ensureDocumentsLoaded = async () => {
-    if (documentsLoaded.value || !entity()?.id) return
+    const e = entity()
+    if (documentsLoaded.value || !e?.id || e.pendingEntity) return
     await refreshDocuments()
   }
 

frontend/tests/composables/useEntityDocuments.test.ts

@@ -0,0 +1,73 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+
+import { useEntityDocuments } from '~/composables/useEntityDocuments'
+
+// ---------------------------------------------------------------------------
+// Mocks
+// ---------------------------------------------------------------------------
+
+const mockLoadDocumentsByPiece = vi.fn()
+const mockLoadDocumentsByComponent = vi.fn()
+
+vi.mock('~/composables/useDocuments', () => ({
+  useDocuments: () => ({
+    loadDocumentsByPiece: mockLoadDocumentsByPiece,
+    loadDocumentsByComponent: mockLoadDocumentsByComponent,
+    uploadDocuments: vi.fn(),
+    deleteDocument: vi.fn(),
+    updateDocument: vi.fn(),
+  }),
+}))
+
+vi.mock('~/utils/documentPreview', () => ({
+  canPreviewDocument: () => true,
+}))
+
+beforeEach(() => {
+  vi.clearAllMocks()
+})
+
+// ---------------------------------------------------------------------------
+// refreshDocuments — pending / orphan entities
+// ---------------------------------------------------------------------------
+describe('refreshDocuments', () => {
+  it('does NOT load documents for a pending piece node (orphan link id is not a piece id)', async () => {
+    // A category-only / pending piece node: its `id` is the machinePieceLink id,
+    // there is no real piece behind it (pieceId is null).
+    const pendingNode = {
+      id: 'cl48179803369dd93b4a90b784', // machinePieceLink id, NOT a piece id
+      pieceId: null,
+      pendingEntity: true,
+      documents: [],
+    }
+
+    const { refreshDocuments } = useEntityDocuments({
+      entity: () => pendingNode,
+      entityType: 'piece',
+    })
+
+    await refreshDocuments()
+
+    expect(mockLoadDocumentsByPiece).not.toHaveBeenCalled()
+  })
+
+  it('loads documents for a real piece node using its piece id', async () => {
+    mockLoadDocumentsByPiece.mockResolvedValue({ success: true, data: [] })
+
+    const realNode = {
+      id: 'clrealpieceid000000000000',
+      pieceId: 'clrealpieceid000000000000',
+      pendingEntity: false,
+      documents: [],
+    }
+
+    const { refreshDocuments } = useEntityDocuments({
+      entity: () => realNode,
+      entityType: 'piece',
+    })
+
+    await refreshDocuments()
+
+    expect(mockLoadDocumentsByPiece).toHaveBeenCalledWith('clrealpieceid000000000000', { updateStore: false })
+  })
+})

migrations/Version20260529150000_AddMissingPieceCascadeFKs.php

@@ -0,0 +1,145 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Repair migration for Version20260528090000_FixPieceCascadeFKs.
+ *
+ * On some environments (prod included) that migration was recorded as executed
+ * but two of its six FKs to `pieces.id` never took effect:
+ *   - machine_piece_links.pieceid   (fk_mpl_piece)
+ *   - custom_field_values.pieceid   (fk_cfv_piece)
+ * Without them, deleting a Piece leaves orphan rows behind (a stale pieceid
+ * pointing to a non-existent piece), which surfaces as a "Catégorie sans item"
+ * ghost on the machine detail page and a 404 on /documents/piece/{id}.
+ *
+ * This migration re-applies ONLY those two missing pieces of the original one:
+ * snapshot orphans to audit_logs, delete them, then (re)add the FK with the
+ * correct ON DELETE CASCADE. Fully idempotent — safe where the FKs already exist.
+ */
+final class Version20260529150000_AddMissingPieceCascadeFKs extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Repair missing CASCADE FKs to pieces on machine_piece_links and custom_field_values (orphan cleanup + fk_mpl_piece / fk_cfv_piece)';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // =========================================================================
+        // 1. Audit log : snapshot des rows orphelines avant suppression.
+        // =========================================================================
+        $this->addSql(<<<'SQL'
+            INSERT INTO audit_logs (id, entitytype, entityid, action, snapshot, actorprofileid, createdat)
+            SELECT
+              'cl' || substring(md5(random()::text || clock_timestamp()::text), 1, 24),
+              'machine_piece_link',
+              l.id,
+              'delete',
+              json_build_object(
+                'id', l.id,
+                'machineId', l.machineid,
+                'pieceId', l.pieceid,
+                'note', 'Cleaned by FK cascade repair migration (Version20260529150000) - referenced piece no longer existed'
+              ),
+              NULL,
+              NOW()
+            FROM machine_piece_links l
+            WHERE l.pieceid IS NOT NULL
+              AND l.pieceid NOT IN (SELECT id FROM pieces)
+            SQL);
+
+        $this->addSql(<<<'SQL'
+            INSERT INTO audit_logs (id, entitytype, entityid, action, snapshot, actorprofileid, createdat)
+            SELECT
+              'cl' || substring(md5(random()::text || clock_timestamp()::text), 1, 24),
+              'custom_field_value',
+              v.id,
+              'delete',
+              json_build_object(
+                'id', v.id,
+                'pieceId', v.pieceid,
+                'note', 'Cleaned by FK cascade repair migration (Version20260529150000) - referenced piece no longer existed'
+              ),
+              NULL,
+              NOW()
+            FROM custom_field_values v
+            WHERE v.pieceid IS NOT NULL
+              AND v.pieceid NOT IN (SELECT id FROM pieces)
+            SQL);
+
+        // =========================================================================
+        // 2. Nettoyage des orphelins (avant ADD CONSTRAINT, sinon PG rejette).
+        // =========================================================================
+        $this->addSql(<<<'SQL'
+            DELETE FROM machine_piece_links
+            WHERE pieceid IS NOT NULL
+              AND pieceid NOT IN (SELECT id FROM pieces)
+            SQL);
+
+        $this->addSql(<<<'SQL'
+            DELETE FROM custom_field_values
+            WHERE pieceid IS NOT NULL
+              AND pieceid NOT IN (SELECT id FROM pieces)
+            SQL);
+
+        // =========================================================================
+        // 3. Drop des éventuelles FK existantes vers `pieces` (quel que soit leur
+        //    nom historique), puis ADD CONSTRAINT avec le bon ON DELETE.
+        // =========================================================================
+        $this->dropFksReferencingPieces('machine_piece_links', 'pieceid');
+        $this->addSql(<<<'SQL'
+            ALTER TABLE machine_piece_links ADD CONSTRAINT fk_mpl_piece
+              FOREIGN KEY (pieceid) REFERENCES pieces(id) ON DELETE CASCADE
+            SQL);
+
+        $this->dropFksReferencingPieces('custom_field_values', 'pieceid');
+        $this->addSql(<<<'SQL'
+            ALTER TABLE custom_field_values ADD CONSTRAINT fk_cfv_piece
+              FOREIGN KEY (pieceid) REFERENCES pieces(id) ON DELETE CASCADE
+            SQL);
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE machine_piece_links DROP CONSTRAINT IF EXISTS fk_mpl_piece');
+        $this->addSql('ALTER TABLE custom_field_values DROP CONSTRAINT IF EXISTS fk_cfv_piece');
+    }
+
+    /**
+     * Drop every FK on $table.$column that references the `pieces` table,
+     * regardless of its historic name. Idempotent.
+     */
+    private function dropFksReferencingPieces(string $table, string $column): void
+    {
+        $sql = <<<SQL
+            DO \$\$
+            DECLARE
+              fk_name TEXT;
+            BEGIN
+              FOR fk_name IN
+                SELECT tc.constraint_name
+                FROM information_schema.table_constraints tc
+                JOIN information_schema.key_column_usage kcu
+                  ON kcu.constraint_name = tc.constraint_name
+                 AND kcu.table_schema    = tc.table_schema
+                JOIN information_schema.constraint_column_usage ccu
+                  ON ccu.constraint_name = tc.constraint_name
+                 AND ccu.table_schema    = tc.table_schema
+                WHERE tc.table_name      = '{$table}'
+                  AND tc.constraint_type = 'FOREIGN KEY'
+                  AND kcu.column_name    = '{$column}'
+                  AND ccu.table_name     = 'pieces'
+              LOOP
+                EXECUTE format('ALTER TABLE {$table} DROP CONSTRAINT %I', fk_name);
+              END LOOP;
+            END \$\$;
+            SQL;
+        $this->addSql($sql);
+    }
+}