test(api): add resetDb helper + per-test isolation (proof: sessions suite)

apps/api/test/helpers.ts

@@ -1,7 +1,7 @@
 import type { Hono } from 'hono';
 import { auth } from '../src/auth';
 import { db } from '../src/db/client';
-import { activities } from '../src/db/schema';
+import { account, activities, session, user, verification, workSessions } from '../src/db/schema';
 
 const PASSWORD = 'sterk-wachtwoord-123';
 const json = { 'content-type': 'application/json' };
@@ -44,6 +44,18 @@ export function bearer(token: string): Record<string, string> {
   return { authorization: `Bearer ${token}`, 'content-type': 'application/json' };
 }
 
+// Wipe all data rows (schema stays; migration already ran once in setup.ts).
+// Lets a domain suite start from an empty DB in beforeEach instead of inheriting
+// rows from earlier test files (removes the accumulate-and-scope fragility).
+export async function resetDb(): Promise<void> {
+  await db.delete(workSessions);
+  await db.delete(session);
+  await db.delete(account);
+  await db.delete(verification);
+  await db.delete(user);
+  await db.delete(activities);
+}
+
 // Insert an activity straight into the DB (test setup that should not depend on authz).
 export async function seedActivity(
   name: string,