A Postgres Listen/Notify based Notifier.

Usage

Specify the Postgres notifier in your Oban configuration:

config :my_app, Oban,
  notifier: Oban.Notifiers.Postgres

Caveats

The notifications system is built on PostgreSQL's LISTEN/NOTIFY functionality. Notifications are only delivered after a transaction completes and are de-duplicated before publishing. Typically, applications run Ecto in sandbox mode while testing, but sandbox mode wraps each test in a separate transaction that's rolled back after the test completes. That means the transaction is never committed, which prevents delivering any notifications.

To test using notifications you must run Ecto without sandbox mode enabled, or use Oban.Notifiers.PG instead.