diff --git a/OakArchive/OakArchive.csproj b/OakArchive/OakArchive.csproj
index 7c977dc..9f0707a 100644
--- a/OakArchive/OakArchive.csproj
+++ b/OakArchive/OakArchive.csproj
@@ -14,6 +14,7 @@
     </ItemGroup>
 
     <ItemGroup>
+      <PackageReference Include="CoenM.ImageSharp.ImageHash" Version="1.3.6" />
       <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.7" />
       <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="10.0.7" />
       <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.7">
@@ -28,13 +29,7 @@
     </ItemGroup>
 
     <ItemGroup>
-      <Folder Include="Controllers\" />
-      <Folder Include="Entities\CardMarket\" />
-      <Folder Include="Entities\Cards\" />
-      <Folder Include="Entities\Collection\" />
-      <Folder Include="Entities\TCGdex\" />
-      <Folder Include="Entities\User\" />
-      <Folder Include="Models\" />
+      <Folder Include="Controllers\V1\" />
     </ItemGroup>
 
 </Project>
diff --git a/OakArchive/Program.cs b/OakArchive/Program.cs
index 0ece349..e76c8b1 100644
--- a/OakArchive/Program.cs
+++ b/OakArchive/Program.cs
@@ -1,21 +1,67 @@
+using Microsoft.EntityFrameworkCore;
+using OakArchive.Database;
+using OakArchive.Services;
+
 namespace OakArchive;
 
 public class Program
 {
-    public static void Main(string[] args)
+    public static async Task Main(string[] args)
     {
         var builder = WebApplication.CreateBuilder(args);
 
-        // Add services to the container.
 
         builder.Services.AddControllers();
 
+        builder.Services.AddDbContext<ApplicationDbContext>(options =>
+            options.UseNpgsql(builder.Configuration["DefaultConnection"]));
+
+
+        builder.Services.AddMemoryCache(); // Registriert das native IMemoryCache von Microsoft
+        builder.Services.AddSingleton<IMemoryCacheService, MemoryCacheService>();
+
+        builder.Services.AddHttpClient<ITcgDexService, TcgDexService>(client =>
+        {
+            client.BaseAddress = new Uri("https://api.tcgdex.net/v2/");
+            client.DefaultRequestHeaders.Add("Accept", "application/json");
+        });
+
+        builder.Services.AddScoped<ITcgDexDataUpdater, TcgDexDataUpdater>();
+
         var app = builder.Build();
 
-        // Configure the HTTP request pipeline.
+        app.Lifetime.ApplicationStarted.Register(async () =>
+        {
+            // Da ApplicationStarted synchron registriert, machen wir hier einen neuen asynchronen Scope auf
+            using var scope = app.Services.CreateScope();
+            try
+            {
+                var context = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
+
+                Console.WriteLine("[INFO] Prüfe auf ausstehende Datenbank-Migrationen...");
+
+                // Führt alle ausstehenden Migrationen auf der PostgreSQL-Datenbank aus.
+                // Falls die Datenbank noch gar nicht existiert, wird sie hier automatisch erstellt!
+                await context.Database.MigrateAsync();
+
+                var updater = scope.ServiceProvider.GetRequiredService<ITcgDexDataUpdater>();
+
+                Console.WriteLine("[INFO] === Starte TCGdex Test-Sync im Hintergrund ===");
+
+                var result = await updater.SyncBaseDataFromTcgDex();
+
+                Console.WriteLine($"[INFO] === Test-Sync beendet! Neue Daten geladen: {result} ===");
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"[FEHLER] !!! Fehler beim Test-Sync: {ex.Message} !!!");
+                Console.WriteLine(ex.StackTrace);
+            }
+        });
 
         app.UseAuthorization();
 
+        app.UseStaticFiles();
 
         app.MapControllers();
 
diff --git a/OakArchive/Util/PerceptualHashHelper.cs b/OakArchive/Util/PerceptualHashHelper.cs
new file mode 100644
index 0000000..604ce8c
--- /dev/null
+++ b/OakArchive/Util/PerceptualHashHelper.cs
@@ -0,0 +1,47 @@
+using CoenM.ImageHash.HashAlgorithms;
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.PixelFormats;
+using SixLabors.ImageSharp.Processing;
+
+namespace OakArchive.Util;
+
+public class PerceptualHashHelper
+{
+    private static readonly PerceptualHash _perceptualHash = new();
+
+    private const int TargetWidth = 600;
+    private const int TargetHeight = 840;
+    private const int Margin = 15;
+    
+    public static ulong GenerateHash(byte[] rawImage)
+    {
+        using var image = Image.Load<Rgba32>(rawImage);
+
+        image.Mutate(x => x.Resize(TargetWidth, TargetHeight));
+
+        return _perceptualHash.Hash(image);
+    }
+    
+    public static ulong GenerateHashWithMargin(byte[] rawImage)
+    {
+        using var image = Image.Load<Rgba32>(rawImage);
+
+        const int maxContentWidth = TargetWidth - (2 * Margin);
+        const int maxContentHeight = TargetHeight - (2 * Margin);
+
+        image.Mutate(x => x.Resize(new ResizeOptions
+        {
+            Size = new Size(maxContentWidth, maxContentHeight),
+            Mode = ResizeMode.Max 
+        }));
+
+        using var canvas = new Image<Rgba32>(TargetWidth, TargetHeight, Color.Black);
+    
+        var posX = (TargetWidth - image.Width) / 2;
+        var posY = (TargetHeight - image.Height) / 2;
+
+        canvas.Mutate(x => x.DrawImage(image, new Point(posX, posY), 1f));
+        
+        return _perceptualHash.Hash(canvas);
+    }
+}
\ No newline at end of file
diff --git a/compose.yaml b/compose.yaml
index d4c7bd8..7cdb608 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -4,13 +4,12 @@
     build:
       context: .
       dockerfile: OakArchive/Dockerfile
-    # Falls die DB in einer anderen Datei ist, nimm depends_on raus, 
-    # da Compose nur Services innerhalb derselben Datei überwachen kann.
     networks:
       - postgres-network
     environment:
-      # WICHTIG: Host muss der 'container_name' oder 'service_name' der DB sein
-      - CONNECTION_STRING=Host=OmniDB;Database=oak_db;Username=admin;Password=${DB_PASSWORD}
+      - DefaultConnection=Host=OmniDB;Database=oak_db;Username=admin;Password=${DB_PASSWORD}
+    volumes:
+      - C:\Users\larsh\Documents\docker\oakarchive\Cards:/app/Cards
 
 networks:
   postgres-network: