feat: payload logging (on/off + gzip) via appsettings + fix destroy messages ref

Services/AnthropicService.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.IO.Compression;
 using System.Net.Http;
 using System.Net.Http.Headers;
 using System.Text;
@@ -19,14 +20,18 @@ public class AnthropicService
     private readonly ToolService _toolService;
     private readonly DatabaseService _db;
     private readonly MemoryService _memoryService;
+    private readonly bool _payloadLogging;
+    private readonly bool _payloadLoggingGzip;
 
-    public AnthropicService(IHttpClientFactory httpFactory, string token, ToolService toolService, DatabaseService db, MemoryService memoryService = null)
+    public AnthropicService(IHttpClientFactory httpFactory, string token, ToolService toolService, DatabaseService db, MemoryService memoryService = null, bool payloadLogging = false, bool payloadLoggingGzip = false)
     {
         _httpFactory = httpFactory;
         _token = token;
         _toolService = toolService;
         _db = db;
         _memoryService = memoryService;
+        _payloadLogging = payloadLogging;
+        _payloadLoggingGzip = payloadLoggingGzip;
     }
 
     public async Task StreamChat(
@@ -416,15 +421,28 @@ public class AnthropicService
         return finalText.Length > 0 ? finalText.ToString() : "(Keine Textantwort)";
     }
 
-    private static void LogPayload(string json, string sessionId, string chainId, int iteration)
+    private void LogPayload(string json, string sessionId, string chainId, int iteration)
     {
+        if (!_payloadLogging) return;
         try
         {
             var logsDir = Path.Combine(AppContext.BaseDirectory, "data", "logs");
             Directory.CreateDirectory(logsDir);
             var timestamp = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
-            var fileName = $"{timestamp}-{sessionId}-{chainId}-iter{iteration}-payload.json";
-            File.WriteAllText(Path.Combine(logsDir, fileName), json);
+            var baseName = $"{timestamp}-{sessionId}-{chainId}-iter{iteration}-payload";
+
+            if (_payloadLoggingGzip)
+            {
+                var filePath = Path.Combine(logsDir, baseName + ".json.gz");
+                using var fs = File.Create(filePath);
+                using var gz = new GZipStream(fs, CompressionLevel.Fastest);
+                using var writer = new StreamWriter(gz, Encoding.UTF8);
+                writer.Write(json);
+            }
+            else
+            {
+                File.WriteAllText(Path.Combine(logsDir, baseName + ".json"), json);
+            }
         }
         catch { /* Logging darf nie die App crashen */ }
     }