Matheus d66170c795 feat: implement tenant isolation with PostgreSQL RLS ...

- users + tenant_memberships tables (tenant-scoped)
- RLS policy on tenant_memberships using set_config('app.current_tenant_id', ...)
- withTenantContext() helper for transaction-scoped tenant context
- separate non-superuser app role (b2bcall_app): the default Docker postgres
  user is SUPERUSER and always bypasses RLS even with FORCE, so the app must
  never connect through the migration/owner role. Documented in
  docs/TENANT_ISOLATION.md.
- automated isolation test proving tenant A never sees tenant B's data

2026-08-28 05:47:23 -03:00

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