NewGracefulContext will create a GracefulContext with an idle time which should be longer than a typical operation cadence, and a "force after" duration which should be long enough to let some amount of operations to finish.

NewOutbox creates a new Outbox with a MongoDB URI: `mongodb://hostname`.

NewOutboxWithClient creates a new Outbox with a client.

WithWatchToken sets a token, used for watching outbox events stored with the same token.

Settings for how old different kind of unprocessed events needs to be to be processed by the periodic sweep.

Interval in which to do a sweep of various unprocessed events.

GracefulContext is a context that can be gracefully cancelled after the original context has been canceled, but with a grace period to let operations finish.

Outbox implements an eventhorizon.Outbox for MongoDB.

Option is an option setter used to configure creation.