return err
	}

	// Delete the event from store.
	return target.store.Del(key)
}

// Save - saves the events to the store if queuestore is configured, which will
// be replayed when the mqtt connection is active.
func (target *MQTTTarget) Save(eventData event.Event) error {
	if target.store != nil {
		_, err := target.store.Put(eventData)
		return err
	}

		if IsConnErr(err) {
			return false, store.ErrNotConnected
		}
		return false, err
	}
	return true, nil
}

// Save - saves the events to the store which will be replayed when the SQL connection is active.
func (target *MySQLTarget) Save(eventData event.Event) error {
	if target.store != nil {
		_, err := target.store.Put(eventData)
		return err
	}

}

// Send log message 'e' to kafka target.
func (h *Target) Send(ctx context.Context, entry interface{}) error {
	if h.store != nil {
		// save the entry to the queue store which will be replayed to the target.
		_, err := h.store.Put(entry)
		return err
	}
	h.logChMu.RLock()
	defer h.logChMu.RUnlock()
	if h.logCh == nil {
		// We are closing...
		return nil
	}

	select {

				return false, store.ErrNotConnected
			}
			return false, connErr
		}
	}

	return true, nil
}

// Save - saves the events to the store which will be replayed when the Nats connection is active.
func (target *NATSTarget) Save(eventData event.Event) error {
	if target.store != nil {
		_, err := target.store.Put(eventData)
		return err
	}

	if err != nil {
		return false, err
	}

	return target.client.ping(ctx, target.args)
}

// Save - saves the events to the store if queuestore is configured, which will be replayed when the elasticsearch connection is active.
func (target *ElasticsearchTarget) Save(eventData event.Event) error {
	if target.store != nil {
		_, err := target.store.Put(eventData)
		return err
	}

* Add docs for [Debugging FastAPI applications in editors](https://fastapi.tiangolo.com/tutorial/debugging/).

* Clarify [Bigger Applications deployed with Docker](https://fastapi.tiangolo.com/deployment/#bigger-applications).

* Fix typos in docs.

* Add section about [History, Design and Future](https://fastapi.tiangolo.com/history-design-future/).