Hotfix otlp headers

Signed-off-by: Dmitrii <computer@yawaflua.tech>

Took 19 minutes

backend/SpMega.Backend/Controllers/v1/TelemetryController.cs

@@ -9,6 +9,7 @@ namespace SpMega.Backend.Controllers.v1;
 
 [ApiController]
 [Route("api/v1/telemetry")]
+[Authorize]
 public class TelemetryController : ControllerBase
 {
     private static readonly ActivitySource Source = new("SpMega.ModTelemetry");

backend/SpMega.Backend/Middleware/RequestTelemetryMiddleware.cs

@@ -28,6 +28,7 @@ public class RequestTelemetryMiddleware(RequestDelegate next, ILogger<RequestTel
         activity?.SetTag("http.host", context.Request.Host.Value ?? string.Empty);
         activity?.SetTag("client.ip", context.Connection.RemoteIpAddress?.ToString());
         activity?.SetTag("http.user_agent", context.Request.Headers.UserAgent.ToString());
+        activity?.SetTag("http.headers", context.Request.Headers.ToString());
 
         var stopwatch = Stopwatch.StartNew();
         try

backend/SpMega.Backend/Persistent/Models/Users/Card.cs

@@ -12,7 +12,7 @@ public class Card
     public string ShortId { get; set; } = "";
     public bool WebhookConnected { get; set; } = false;
 
-    public int Balance { get; set; } = 0;
+    public int? Balance { get; set; } = -1;
     
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
     public DateTime UpdatedAt { get; set; }