diff --git a/MoneyMap/Program.cs b/MoneyMap/Program.cs
index a478362..485cdd5 100644
--- a/MoneyMap/Program.cs
+++ b/MoneyMap/Program.cs
@@ -10,6 +10,15 @@ builder.Services.AddRazorPages();
 builder.Services.AddDbContext<MoneyMapContext>(options =>
     options.UseSqlServer(builder.Configuration.GetConnectionString("MoneyMapDb")));
 
+// Add session support
+builder.Services.AddDistributedMemoryCache();
+builder.Services.AddSession(options =>
+{
+    options.IdleTimeout = TimeSpan.FromMinutes(30);
+    options.Cookie.HttpOnly = true;
+    options.Cookie.IsEssential = true;
+});
+
 // Add the new services here
 builder.Services.AddScoped<ITransactionImporter, TransactionImporter>();
 builder.Services.AddScoped<ICardResolver, CardResolver>();
@@ -25,6 +34,13 @@ builder.Services.AddHttpClient<IReceiptParser, OpenAIReceiptParser>();
 
 var app = builder.Build();
 
+// Seed default category mappings on startup
+using (var scope = app.Services.CreateScope())
+{
+    var categorizer = scope.ServiceProvider.GetRequiredService<ITransactionCategorizer>();
+    await categorizer.SeedDefaultMappingsAsync();
+}
+
 // Configure the HTTP request pipeline.
 if (!app.Environment.IsDevelopment())
 {
@@ -37,6 +53,8 @@ app.UseStaticFiles();
 
 app.UseRouting();
 
+app.UseSession();
+
 app.UseAuthorization();
 
 app.MapRazorPages();