Wheels 4.0 lifts multi-tenancy out of plugin territory and into the framework core. Per-request datasource switching catches every query and every job on the way to the database, and tenant-aware background jobs come along for the ride.
Wheels 4.0 ships a production-ready job queue that needs only your database. You get a persistent CLI worker, live monitoring, configurable backoff, and tenant-aware enqueueing without any extra services. Redis still wins for very high throughput and pub/sub fan-out — this post names where the DB-backed queue is the right call and where it is not.