diff --git a/Backend/models/user.go b/Backend/models/user.go
index 1e87b3d..373ae27 100644
--- a/Backend/models/user.go
+++ b/Backend/models/user.go
@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"log"
+	"log/slog"
 	"time"
 
 	"github.com/alexedwards/scs/v2"
@@ -62,7 +63,6 @@ func GetAllUsers() ([]User, error) {
 	qStr, err := DB.Prepare((`SELECT card_uid, vorname, nachname,arbeitszeit_per_tag, arbeitszeit_per_woche FROM s_personal_daten;`))
 	var users []User
 	if err != nil {
-		fmt.Printf("Error preparing query statement %v\n", err)
 		return users, err
 	}
 	defer qStr.Close()
@@ -90,7 +90,6 @@ func (u *User) GetAll() ([]User, error) {
 	qStr, err := DB.Prepare((`SELECT card_uid, vorname, nachname FROM s_personal_daten;`))
 	var users []User
 	if err != nil {
-		fmt.Printf("Error preparing query statement %v\n", err)
 		return users, err
 	}
 	defer qStr.Close()
@@ -136,7 +135,7 @@ func (u *User) ArbeitszeitProWocheFrac(fraction float32) time.Duration {
 func (u *User) CheckAnwesenheit() bool {
 	qStr, err := DB.Prepare((`SELECT check_in_out FROM anwesenheit WHERE card_uid = $1 AND "timestamp"::date = now()::date ORDER BY "timestamp" DESC LIMIT 1;`))
 	if err != nil {
-		fmt.Printf("Error preparing query statement %v\n", err)
+		slog.Debug("Error preparing query statement.", "error", err)
 		return false
 	}
 	defer qStr.Close()
@@ -210,7 +209,7 @@ func (u *User) Login(password string) bool {
 	var loginSuccess bool
 	qStr, err := DB.Prepare((`SELECT (pass_hash = crypt($2, pass_hash)) AS pass_hash FROM user_password WHERE personal_nummer = $1;`))
 	if err != nil {
-		log.Println("Error preparing db statement", err)
+		slog.Debug("Error preparing query statement.", "error", err)
 		return false
 	}
 	defer qStr.Close()
@@ -302,7 +301,7 @@ func (u *User) GetLastWorkWeekSubmission() time.Time {
     ) AS letzte_buchung;
 `)
 	if err != nil {
-		log.Println("Error preparing statement!", err)
+		slog.Debug("Error preparing query statement.", "error", err)
 		return lastSub
 	}
 	err = qStr.QueryRow(u.PersonalNummer, u.CardUID).Scan(&lastSub)