diff --git a/c3stream.cs b/c3stream.cs
index 003da4c..49bddac 100644
--- a/c3stream.cs
+++ b/c3stream.cs
@@ -1,25 +1,40 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using c3stream.Pages;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Hosting;
+using Newtonsoft.Json;
 
 namespace c3stream {
 	public static class c3stream {
-		public const  string DataPath  = "data";
-		public const  string DbFile    = "_c3stream.json";
-		public const  string CachePath = "/mnt/storage/archive/Video/congress/";
-		public const  string CacheUrl  = "https://mirror.c3stream.de/";
-		public static object Lock      = new object();
-		public static string DbPath    = Path.Combine(DataPath, DbFile);
+		public const  string           DataPath  = "data";
+		public const  string           DbFile    = "_c3stream.json";
+		public const  string           CachePath = "/mnt/storage/archive/Video/congress/";
+		public const  string           CacheUrl  = "https://mirror.c3stream.de/";
+		public static object           Lock      = new object();
+		public static string           DbPath    = Path.Combine(DataPath, DbFile);
+		public static List<UserStatus> UserData  = new List<UserStatus>();
 
 		public static void Main(string[] args) {
 			if (!Directory.Exists(DataPath))
 				Directory.CreateDirectory(DataPath);
 			if (!File.Exists(DbPath))
 				ConferenceModel.WriteEventMetadata();
-			CreateHostBuilder(args).Build().Run();
+			ConferenceModel.ReadEventMetadata();
+
+			foreach (var e in ConferenceModel.EventMetadata.FindAll(p => p.State != null)) {
+				foreach (var state in e.State) {
+					lock (Lock) {
+						UserData.Add(new UserStatus(state.Guid, e.Guid, state.State));
+					}
+				}
+			}
+			WriteUserData();
+
+			//CreateHostBuilder(args).Build().Run();
 		}
 
 		public static void UpdateCookie(HttpRequest resquest, HttpResponse response, string redirectUri) {
@@ -40,6 +55,24 @@ namespace c3stream {
 			}
 		}
 
+		public static void WriteUserData() {
+			lock (Lock) {
+				File.WriteAllText(Path.Combine(DataPath, "c3stream.user.json"), JsonConvert.SerializeObject(UserData));
+			}
+		}
+
+		public class UserStatus {
+			public readonly string TalkId;
+			public readonly string UserId;
+			public          string State;
+
+			public UserStatus(string userId, string talkId, string state = "unwatched") {
+				UserId = userId;
+				State  = state;
+				TalkId = talkId;
+			}
+		}
+
 		public static IHostBuilder CreateHostBuilder(string[] args) =>
 			Host.CreateDefaultBuilder(args).ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup<Startup>(); });
 	}