diff --git a/.gitea/workflows/hub-check.yml b/.gitea/workflows/hub-check.yml
index 1518179..7b7e010 100644
--- a/.gitea/workflows/hub-check.yml
+++ b/.gitea/workflows/hub-check.yml
@@ -7,11 +7,10 @@ name: hub check
 
 on:
   push:
-  pull_request:
   workflow_dispatch:
 
 concurrency:
-  group: hub-check-${{ github.workflow }}-${{ github.ref }}
+  group: hub-check-${{ github.ref }}
   cancel-in-progress: true
 
 jobs:
diff --git a/hub/test/integration/helpers.ts b/hub/test/integration/helpers.ts
index 60f8ed2..29491b3 100644
--- a/hub/test/integration/helpers.ts
+++ b/hub/test/integration/helpers.ts
@@ -69,16 +69,18 @@ export async function resetDb(): Promise<void> {
       END IF;
     END $$;
   `);
+  const leftover = await prisma.organization.count();
+  if (leftover !== 0) {
+    throw new Error(`resetDb truncate left ${leftover} organization row(s)`);
+  }
   await seedTestOrganization();
 }
+
 export async function seedTestOrganization(
   id: string = DEFAULT_ORG_ID,
   slug: string = "test-default",
 ): Promise<void> {
-  // Prefer explicit create-after-wipe over upsert: leftover half-states after
-  // interrupted tests made Prisma upsert hit unique(id) while where saw zero.
   await prisma.$transaction(async (tx) => {
-    await tx.organization.deleteMany({ where: { OR: [{ id }, { slug }] } });
     await tx.organization.create({
       data: {
         id,
diff --git a/hub/vitest.config.ts b/hub/vitest.config.ts
index f9623a9..0b64ad5 100644
--- a/hub/vitest.config.ts
+++ b/hub/vitest.config.ts
@@ -7,6 +7,7 @@ export default defineConfig({
     // concurrent truncate/insert races. Unit tests are fast either way.
     pool: "forks",
     fileParallelism: false,
+    maxWorkers: 1,
     env: { NODE_ENV: "test" },
   },
 });