diff --git a/Elwig/Helpers/AppDbContext.cs b/Elwig/Helpers/AppDbContext.cs
index ec15c2b..57e791c 100644
--- a/Elwig/Helpers/AppDbContext.cs
+++ b/Elwig/Helpers/AppDbContext.cs
@@ -248,14 +248,6 @@ namespace Elwig.Helpers {
             return c + 1;
         }
 
-        public async Task<WineQualLevel> GetWineQualityLevel(double kmw, string? maxQualId = null) {
-            return await WineQualityLevels
-                .Where(q => !q.IsPredicate && (q.MinKmw == null || q.MinKmw <= kmw))
-                .Where(q => maxQualId == null || q.QualId == "WEI" || q.QualId == maxQualId)
-                .OrderBy(q => q.MinKmw)
-                .LastAsync();
-        }
-
         public void UpdateDeliveryPartModifiers(DeliveryPart part, IEnumerable<Modifier> oldModifiers, IEnumerable<Modifier> newModifiers) {
             foreach (var m in Modifiers.Where(m => m.Year == part.Year)) {
                 var mod = new DeliveryPartModifier {
diff --git a/Elwig/Windows/DeliveryAdminWindow.xaml.cs b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
index 7b11550..3e8ebc1 100644
--- a/Elwig/Windows/DeliveryAdminWindow.xaml.cs
+++ b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
@@ -8,6 +8,7 @@ using Elwig.ViewModels;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Win32;
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using System.Windows;
@@ -34,6 +35,8 @@ namespace Elwig.Windows {
 
         private readonly Button[] WeighingButtons;
 
+        private List<WineQualLevel> WineQualityLevels = [];
+
         public DeliveryAdminWindow(bool receipt = false) {
             InitializeComponent();
             CommandBindings.Add(new CommandBinding(CtrlF, FocusSearchInput));
@@ -483,7 +486,8 @@ namespace Elwig.Windows {
             var cultList = await ctx.WineCultivations.OrderBy(a => a.Name).Cast<object>().ToListAsync();
             cultList.Insert(0, new NullItem(""));
             ControlUtils.RenewItemsSource(CultivationInput, cultList, null, ControlUtils.RenewSourceDefault.First);
-            ControlUtils.RenewItemsSource(WineQualityLevelInput, await ctx.WineQualityLevels.ToListAsync());
+            WineQualityLevels = await ctx.WineQualityLevels.ToListAsync();
+            ControlUtils.RenewItemsSource(WineQualityLevelInput, WineQualityLevels);
             ControlUtils.RenewItemsSource(ModifiersInput, await ctx.Modifiers
                 .Where(m => m.Year == y && (!IsCreating || m.IsActive))
                 .OrderBy(m => m.Ordering)
@@ -1230,23 +1234,30 @@ namespace Elwig.Windows {
             }
         }
 
+        private WineQualLevel GetWineQualityLevel(double kmw, string? maxQualId = null) {
+            return WineQualityLevels
+                .Where(q => !q.IsPredicate && (q.MinKmw == null || q.MinKmw <= kmw))
+                .Where(q => maxQualId == null || q.QualId == "WEI" || q.QualId == maxQualId)
+                .OrderBy(q => q.MinKmw)
+                .Last();
+        }
+
         private void UpdateWineQualityLevels() {
-            using var ctx = new AppDbContext();
             if (!GetInputValid(GradationKmwInput)) {
                 UnsetDefaultValue(WineQualityLevelInput);
                 ComboBox_SelectionChanged(WineQualityLevelInput, null);
-                WineQualityLevelInput.ItemsSource = ctx.WineQualityLevels.ToList();
+                WineQualityLevelInput.ItemsSource = WineQualityLevels;
                 WineQualityLevelInput.SelectedItem = null;
                 return;
             }
             var kmw = (double)ViewModel.GradationKmw!;
             var max = ViewModel.WineVar?.MaxQualId;
             var quw = ViewModel.WineVar?.IsQuw ?? true;
-            WineQualityLevelInput.ItemsSource = ctx.WineQualityLevels
+            WineQualityLevelInput.ItemsSource = WineQualityLevels
                 .Where(q => q.MinKmw == null || q.MinKmw <= kmw)
                 .Where(q => quw || q.QualId == "WEI" || q.QualId == max)
                 .ToList();
-            var qual = ctx.GetWineQualityLevel(kmw, !quw ? max : null).GetAwaiter().GetResult();
+            var qual = GetWineQualityLevel(kmw, !quw ? max : null);
             SetDefaultValue(WineQualityLevelInput, qual);
             if (WineQualityLevelInput.SelectedItem == null || (WineQualityLevelInput.SelectedItem is WineQualLevel selected && !selected.IsPredicate)) {
                 ControlUtils.SelectItem(WineQualityLevelInput, qual);
@@ -1386,8 +1397,7 @@ namespace Elwig.Windows {
                 AbgewertetInput.IsChecked = false;
                 return;
             }
-            using var ctx = new AppDbContext();
-            var defQual = ctx.GetWineQualityLevel(ViewModel.GradationKmw!.Value, !(ViewModel.WineVar?.IsQuw ?? true) ? ViewModel.WineVar?.MaxQualId : null).GetAwaiter().GetResult();
+            var defQual = GetWineQualityLevel(ViewModel.GradationKmw!.Value, !(ViewModel.WineVar?.IsQuw ?? true) ? ViewModel.WineVar?.MaxQualId : null);
             AbgewertetInput.IsChecked = !qual.IsPredicate && defQual != qual;
         }