diff --git a/hub/test/integration/helpers.ts b/hub/test/integration/helpers.ts
index dc3efb6..e13c5cb 100644
--- a/hub/test/integration/helpers.ts
+++ b/hub/test/integration/helpers.ts
@@ -50,20 +50,25 @@ export const prisma = new PrismaClient({
 
 /** Truncate all tables before each test for isolation. */
 export async function resetDb(): Promise<void> {
-  // User and Organization are the aggregate roots for all domain rows; their
-  // declared FK cascades clear projects, search documents, permissions,
-  // sessions and connections without repeatedly truncating pg_trgm indexes.
-  // Event receipts and global audit rows are independent roots.
-  await prisma.$transaction([
-    prisma.feishuEventReceipt.deleteMany(),
-    prisma.auditEntry.deleteMany(),
-    // Permission resource ids are intentionally polymorphic strings, so these
-    // two tables have no FK to Project and must be cleared explicitly.
-    prisma.permissionGrant.deleteMany(),
-    prisma.permissionSettings.deleteMany(),
-    prisma.user.deleteMany(),
-    prisma.organization.deleteMany(),
-  ]);
+  // Hard reset via TRUNCATE CASCADE. Parent RESTRICT edges and leftover
+  // folder trees made deleteMany-based cleanup race Prisma upserts
+  // ("Unique constraint failed on id" while the where-branch saw no row).
+  await prisma.$executeRawUnsafe(`
+    DO $$
+    DECLARE
+      stmt text;
+    BEGIN
+      SELECT 'TRUNCATE TABLE ' || string_agg(format('%I.%I', schemaname, tablename), ', ')
+             || ' RESTART IDENTITY CASCADE'
+        INTO stmt
+      FROM pg_tables
+      WHERE schemaname = 'public'
+        AND tablename <> '_prisma_migrations';
+      IF stmt IS NOT NULL THEN
+        EXECUTE stmt;
+      END IF;
+    END $$;
+  `);
   await seedTestOrganization();
 }