Updated

EonaCat.Logger.LogServer/Models/LogEntry.cs

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+using EonaCat.Json;
+using Microsoft.AspNetCore.Mvc.Rendering;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Text.Json;
+
+namespace LogCentral.Server.Models;
+
+public class LogEntry
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+
+    public DateTime Timestamp { get; set; }
+
+    public string ApplicationName { get; set; } = default!;
+    public string ApplicationVersion { get; set; } = default!;
+    public string Environment { get; set; } = default!;
+    public string MachineName { get; set; } = default!;
+    public int Level { get; set; }
+    public string Category { get; set; } = default!;
+    public string Message { get; set; } = default!;
+
+    public string? Exception { get; set; }
+    public string? StackTrace { get; set; }
+
+    [Column(TypeName = "TEXT")]
+    public string? PropertiesJson { get; set; }
+
+    [NotMapped]
+    public Dictionary<string, object>? Properties
+    {
+        get => string.IsNullOrEmpty(PropertiesJson)
+            ? null
+            : JsonHelper.ToObject<Dictionary<string, object>>(PropertiesJson);
+        set => PropertiesJson = value == null ? null : JsonHelper.ToJson(value);
+    }
+
+    public string? UserId { get; set; }
+    public string? SessionId { get; set; }
+    public string? RequestId { get; set; }
+    public string? CorrelationId { get; set; }
+}
+
+public class Application
+{
+    public int Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string ApiKey { get; set; } = Guid.NewGuid().ToString();
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public bool IsActive { get; set; } = true;
+}