diff --git a/persistence.go b/persistence.go
index 933fd10..b786665 100644
--- a/persistence.go
+++ b/persistence.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"log"
 )
 
 type ModelToPersistence struct {
@@ -25,6 +26,7 @@ func NewModelToPersistencePipeline(ctx context.Context, cfg Config) (Pipeline, e
 	if err != nil {
 		return Pipeline{}, err
 	}
+	writer = NewNoopQueue()
 	return Pipeline{
 		writer:  writer,
 		reader:  reader,
@@ -54,6 +56,7 @@ func newModelToPersistenceProcess(storage Storage) processFunc {
 			return nil, fmt.Errorf("failed to persist message: %w", err)
 		}
 
+		log.Printf("persisted models")
 		return json.Marshal(ModelIDs{
 			Event:   m.Event.ID,
 			Thread:  m.Thread.ID,
diff --git a/queue.go b/queue.go
index 6593aa0..8ae6878 100644
--- a/queue.go
+++ b/queue.go
@@ -108,12 +108,22 @@ func (q Queue) syn(ctx context.Context) ([]byte, []byte, error) {
 }
 
 func (q Queue) Ack(ctx context.Context, reservation string) error {
+	return q.ack(ctx, []byte(reservation))
+}
+
+func (q Queue) ack(ctx context.Context, reservation []byte) error {
 	if q.driver.DB == nil {
 		return nil
 	}
-	_, err := q.driver.ExecContext(ctx, `
+	result, err := q.driver.ExecContext(ctx, `
       DELETE FROM queue
       WHERE reservation==?
    `, reservation)
+	if err != nil {
+		return err
+	}
+	if n, _ := result.RowsAffected(); n != 1 {
+		return fmt.Errorf("failed to ack %s: %v rows affected", reservation, n)
+	}
 	return err
 }
diff --git a/slack.go b/slack.go
index 45a282c..d020070 100644
--- a/slack.go
+++ b/slack.go
@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"log"
 	"regexp"
 	"strconv"
 	"strings"
@@ -79,6 +80,8 @@ func newSlackToModelProcess(cfg Config) processFunc {
 		if s.Thread != "" && s.Source != "" && s.TS > 0 && s.Event != "" {
 			thread = model.NewThread(s.Thread, s.Source, s.TS, s.Channel, s.Event)
 		}
+
+		log.Printf("parsed slack message into models")
 		return json.Marshal(Models{
 			Event:   event,
 			Message: message,