SingalR for realtime entitychanges

DiunaBI.API/Hubs/EntityChangeHub.cs

@@ -0,0 +1,16 @@
+using Microsoft.AspNetCore.SignalR;
+
+namespace DiunaBI.API.Hubs;
+
+public class EntityChangeHub : Hub
+{
+    public async Task SendEntityChange(string module, string id, string operation)
+    {
+        await Clients.All.SendAsync("EntityChanged", new
+        {
+            module,
+            id,
+            operation
+        });
+    }
+}

DiunaBI.API/Program.cs

@@ -4,8 +4,10 @@ using Microsoft.IdentityModel.Tokens;
 using System.IdentityModel.Tokens.Jwt;
 using System.Reflection;
 using System.Text;
+using DiunaBI.API.Hubs;
 using DiunaBI.API.Services;
 using DiunaBI.Infrastructure.Data;
+using DiunaBI.Infrastructure.Interceptors;
 using DiunaBI.Infrastructure.Services;
 using Google.Apis.Sheets.v4;
 using Serilog;
@@ -29,10 +31,17 @@ if (builder.Environment.IsProduction())
 
 var connectionString = builder.Configuration.GetConnectionString("SQLDatabase");
 
-builder.Services.AddDbContext<AppDbContext>(x =>
+// Register EntityChangeInterceptor
+builder.Services.AddSingleton<EntityChangeInterceptor>();
+
+builder.Services.AddDbContext<AppDbContext>((serviceProvider, options) =>
 {
-    x.UseSqlServer(connectionString, sqlOptions => sqlOptions.MigrationsAssembly("DiunaBI.Infrastructure"));
+    options.UseSqlServer(connectionString, sqlOptions => sqlOptions.MigrationsAssembly("DiunaBI.Infrastructure"));
-    x.EnableSensitiveDataLogging();
+    options.EnableSensitiveDataLogging();
+
+    // Add EntityChangeInterceptor
+    var interceptor = serviceProvider.GetRequiredService<EntityChangeInterceptor>();
+    options.AddInterceptors(interceptor);
 });
 
 builder.Services.AddCors(options =>
@@ -58,6 +67,9 @@ builder.Services.AddCors(options =>
 
 builder.Services.AddControllers();
 
+// SignalR
+builder.Services.AddSignalR();
+
 builder.Services.AddAuthentication(options =>
 {
     options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
@@ -244,6 +256,9 @@ app.Use(async (context, next) =>
 
 app.MapControllers();
 
+// SignalR Hub
+app.MapHub<EntityChangeHub>("/hubs/entitychanges");
+
 app.MapGet("/health", () => Results.Ok(new { status = "OK", timestamp = DateTime.UtcNow }))
     .AllowAnonymous();
 

DiunaBI.Infrastructure/DiunaBI.Infrastructure.csproj

@@ -26,4 +26,8 @@
         <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="10.0.0" />
     </ItemGroup>
 
+    <ItemGroup>
+        <FrameworkReference Include="Microsoft.AspNetCore.App" />
+    </ItemGroup>
+
 </Project>

DiunaBI.Infrastructure/Interceptors/EntityChangeInterceptor.cs

@@ -0,0 +1,201 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Diagnostics;
+using Microsoft.AspNetCore.SignalR;
+using Microsoft.Extensions.Logging;
+
+namespace DiunaBI.Infrastructure.Interceptors;
+
+public class EntityChangeInterceptor : SaveChangesInterceptor
+{
+    private readonly object? _hubContext;
+    private readonly ILogger<EntityChangeInterceptor>? _logger;
+    private readonly List<(string Module, string Id, string Operation)> _pendingChanges = new();
+
+    public EntityChangeInterceptor(IServiceProvider serviceProvider)
+    {
+        _logger = serviceProvider.GetService(typeof(ILogger<EntityChangeInterceptor>)) as ILogger<EntityChangeInterceptor>;
+
+        // Try to get hub context - it may not be registered in some scenarios (e.g., migrations)
+        try
+        {
+            var hubType = Type.GetType("DiunaBI.API.Hubs.EntityChangeHub, DiunaBI.API");
+            if (hubType != null)
+            {
+                var hubContextType = typeof(IHubContext<>).MakeGenericType(hubType);
+                _hubContext = serviceProvider.GetService(hubContextType);
+
+                if (_hubContext != null)
+                {
+                    _logger?.LogInformation("✅ EntityChangeInterceptor: Hub context initialized");
+                    Console.WriteLine("✅ EntityChangeInterceptor: Hub context initialized");
+                }
+                else
+                {
+                    _logger?.LogWarning("⚠️ EntityChangeInterceptor: Hub context is null");
+                    Console.WriteLine("⚠️ EntityChangeInterceptor: Hub context is null");
+                }
+            }
+            else
+            {
+                _logger?.LogWarning("⚠️ EntityChangeInterceptor: Hub type not found");
+                Console.WriteLine("⚠️ EntityChangeInterceptor: Hub type not found");
+            }
+        }
+        catch (Exception ex)
+        {
+            _logger?.LogError(ex, "❌ EntityChangeInterceptor: Failed to initialize hub context");
+            Console.WriteLine($"❌ EntityChangeInterceptor: Failed to initialize hub context: {ex.Message}");
+            _hubContext = null;
+        }
+    }
+
+    public override ValueTask<InterceptionResult<int>> SavingChangesAsync(
+        DbContextEventData eventData,
+        InterceptionResult<int> result,
+        CancellationToken cancellationToken = default)
+    {
+        _pendingChanges.Clear();
+
+        Console.WriteLine($"🔍 EntityChangeInterceptor.SavingChangesAsync called. HubContext null? {_hubContext == null}, Context null? {eventData.Context == null}");
+
+        if (_hubContext != null && eventData.Context != null)
+        {
+            // Capture changes BEFORE save
+            var entries = eventData.Context.ChangeTracker.Entries().ToList();
+            Console.WriteLine($"🔍 Found {entries.Count} total entries in ChangeTracker");
+
+            foreach (var entry in entries)
+            {
+                Console.WriteLine($"🔍 Entry: {entry.Metadata.ClrType.Name}, State: {entry.State}");
+
+                if (entry.State == EntityState.Added ||
+                    entry.State == EntityState.Modified ||
+                    entry.State == EntityState.Deleted)
+                {
+                    var module = entry.Metadata.GetTableName() ?? entry.Metadata.ClrType.Name;
+                    var id = GetEntityId(entry);
+                    var operation = entry.State switch
+                    {
+                        EntityState.Added => "created",
+                        EntityState.Modified => "updated",
+                        EntityState.Deleted => "deleted",
+                        _ => "unknown"
+                    };
+
+                    Console.WriteLine($"🔍 Detected change: {module} {id} {operation}");
+
+                    if (id != null)
+                    {
+                        _pendingChanges.Add((module, id, operation));
+                        Console.WriteLine($"✅ Added to pending changes: {module} {id} {operation}");
+                    }
+                    else
+                    {
+                        Console.WriteLine($"⚠️ Skipped (id is null): {module} {operation}");
+                    }
+                }
+            }
+
+            Console.WriteLine($"🔍 Total pending changes: {_pendingChanges.Count}");
+        }
+
+        return base.SavingChangesAsync(eventData, result, cancellationToken);
+    }
+
+    public override async ValueTask<int> SavedChangesAsync(
+        SaveChangesCompletedEventData eventData,
+        int result,
+        CancellationToken cancellationToken = default)
+    {
+        // Broadcast changes AFTER successful save
+        if (_hubContext != null && result > 0 && _pendingChanges.Any())
+        {
+            _logger?.LogInformation("📤 Broadcasting {Count} entity changes via SignalR", _pendingChanges.Count);
+            Console.WriteLine($"📤 Broadcasting {_pendingChanges.Count} entity changes via SignalR");
+
+            foreach (var (module, id, operation) in _pendingChanges)
+            {
+                try
+                {
+                    Console.WriteLine($"📤 Broadcasting: {module} {id} {operation}");
+
+                    // Use reflection to call hub methods since we can't reference the API project
+                    var clientsProperty = _hubContext.GetType().GetProperty("Clients");
+                    Console.WriteLine($"   🔍 Clients property: {clientsProperty != null}");
+
+                    if (clientsProperty != null)
+                    {
+                        var clients = clientsProperty.GetValue(_hubContext);
+                        Console.WriteLine($"   🔍 Clients value: {clients != null}, Type: {clients?.GetType().Name}");
+
+                        if (clients != null)
+                        {
+                            var allProperty = clients.GetType().GetProperty("All");
+                            Console.WriteLine($"   🔍 All property: {allProperty != null}");
+
+                            if (allProperty != null)
+                            {
+                                var allClients = allProperty.GetValue(clients);
+                                Console.WriteLine($"   🔍 AllClients value: {allClients != null}, Type: {allClients?.GetType().Name}");
+
+                                if (allClients != null)
+                                {
+                                    // SendAsync is an extension method, so we need to find it differently
+                                    // Look for the IClientProxy interface which has SendCoreAsync
+                                    var sendCoreAsyncMethod = allClients.GetType().GetMethod("SendCoreAsync");
+                                    Console.WriteLine($"   🔍 SendCoreAsync method found: {sendCoreAsyncMethod != null}");
+
+                                    if (sendCoreAsyncMethod != null)
+                                    {
+                                        // SendCoreAsync takes (string method, object?[] args, CancellationToken cancellationToken)
+                                        var task = sendCoreAsyncMethod.Invoke(allClients, new object[]
+                                        {
+                                            "EntityChanged",
+                                            new object[] { new { module, id, operation } },
+                                            cancellationToken
+                                        }) as Task;
+
+                                        Console.WriteLine($"   🔍 Task created: {task != null}");
+
+                                        if (task != null)
+                                        {
+                                            await task;
+                                            Console.WriteLine($"✅ Broadcast successful: {module} {id} {operation}");
+                                        }
+                                        else
+                                        {
+                                            Console.WriteLine($"❌ Task is null after invoke");
+                                        }
+                                    }
+                                    else
+                                    {
+                                        Console.WriteLine($"❌ SendCoreAsync method not found");
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+                catch (Exception ex)
+                {
+                    _logger?.LogError(ex, "❌ Failed to broadcast entity change");
+                    Console.WriteLine($"❌ Failed to broadcast: {ex.Message}");
+                    Console.WriteLine($"❌ Stack trace: {ex.StackTrace}");
+                }
+            }
+        }
+
+        _pendingChanges.Clear();
+        return await base.SavedChangesAsync(eventData, result, cancellationToken);
+    }
+
+    private static string? GetEntityId(Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry entry)
+    {
+        var keyProperty = entry.Metadata.FindPrimaryKey()?.Properties.FirstOrDefault();
+        if (keyProperty == null)
+            return null;
+
+        var value = entry.Property(keyProperty.Name).CurrentValue;
+        return value?.ToString();
+    }
+}

DiunaBI.UI.Shared/Components/JobListComponent.razor.cs

@@ -8,9 +8,10 @@ using Microsoft.JSInterop;
 
 namespace DiunaBI.UI.Shared.Components;
 
-public partial class JobListComponent : ComponentBase
+public partial class JobListComponent : ComponentBase, IDisposable
 {
     [Inject] private JobService JobService { get; set; } = default!;
+    [Inject] private EntityChangeHubService HubService { get; set; } = default!;
     [Inject] private ISnackbar Snackbar { get; set; } = default!;
     [Inject] private NavigationManager NavigationManager { get; set; } = default!;
     [Inject] private IJSRuntime JSRuntime { get; set; } = default!;
@@ -25,6 +26,32 @@ public partial class JobListComponent : ComponentBase
     protected override async Task OnInitializedAsync()
     {
         await LoadJobs();
+
+        // Subscribe to SignalR entity changes
+        HubService.EntityChanged += OnEntityChanged;
+    }
+
+    private async void OnEntityChanged(string module, string id, string operation)
+    {
+        Console.WriteLine($"🔔 JobListComponent.OnEntityChanged called: module={module}, id={id}, operation={operation}");
+
+        // Only react if it's a QueueJobs change
+        if (module.Equals("QueueJobs", StringComparison.OrdinalIgnoreCase))
+        {
+            Console.WriteLine($"📨 Job {id} changed, refreshing job list");
+            await InvokeAsync(async () =>
+            {
+                Console.WriteLine($"🔄 LoadJobs starting...");
+                await LoadJobs();
+                Console.WriteLine($"🔄 StateHasChanged calling...");
+                StateHasChanged();
+                Console.WriteLine($"✅ Job list refresh complete");
+            });
+        }
+        else
+        {
+            Console.WriteLine($"⏭️ Skipping - module '{module}' is not QueueJobs");
+        }
     }
 
     private async Task LoadJobs()
@@ -107,4 +134,9 @@ public partial class JobListComponent : ComponentBase
             _ => Color.Default
         };
     }
+
+    public void Dispose()
+    {
+        HubService.EntityChanged -= OnEntityChanged;
+    }
 }

DiunaBI.UI.Shared/DiunaBI.UI.Shared.csproj

@@ -17,6 +17,7 @@
         <PackageReference Include="Microsoft.AspNetCore.WebUtilities" Version="10.0.0" />
         <PackageReference Include="Microsoft.Extensions.Http" Version="10.0.0" />
         <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="10.0.0" />
+        <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="10.0.0" />
     </ItemGroup>
 
     <ItemGroup>

DiunaBI.UI.Shared/Extensions/ServiceCollectionExtensions.cs

@@ -1,4 +1,6 @@
+using Microsoft.AspNetCore.Components;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
 using DiunaBI.UI.Shared.Services;
 using DiunaBI.UI.Shared.Handlers;
 
@@ -44,6 +46,15 @@ public static class ServiceCollectionExtensions
         services.AddScoped<LayerFilterStateService>();
         services.AddScoped<DataInboxFilterStateService>();
 
+        // SignalR Hub Service (singleton for global connection shared across all users)
+        services.AddSingleton<EntityChangeHubService>(sp =>
+        {
+            // For singleton, we can't inject scoped services directly
+            // We'll get them from the service provider when needed
+            var logger = sp.GetRequiredService<ILogger<EntityChangeHubService>>();
+            return new EntityChangeHubService(apiBaseUrl, sp, logger);
+        });
+
         return services;
     }
 }

DiunaBI.UI.Shared/MainLayout.razor

@@ -1,6 +1,7 @@
 @using MudBlazor
 @using DiunaBI.UI.Shared.Services
 @inject AppConfig AppConfig
+@inject EntityChangeHubService HubService
 @inherits LayoutComponentBase
 
 <AuthGuard>
@@ -54,6 +55,12 @@
     private bool _drawerOpen = true;
     private DrawerVariant _drawerVariant = DrawerVariant.Persistent;
 
+    protected override async Task OnInitializedAsync()
+    {
+        // Initialize SignalR connection when layout loads
+        await HubService.InitializeAsync();
+    }
+
     private MudTheme _theme = new MudTheme()
     {
         PaletteLight = new PaletteLight()

DiunaBI.UI.Shared/Pages/JobDetailPage.razor

@@ -3,8 +3,10 @@
 @using DiunaBI.Domain.Entities
 @using MudBlazor
 @inject JobService JobService
+@inject EntityChangeHubService HubService
 @inject NavigationManager NavigationManager
 @inject ISnackbar Snackbar
+@implements IDisposable
 
 <MudCard>
     <MudCardHeader>
@@ -160,6 +162,24 @@
     protected override async Task OnInitializedAsync()
     {
         await LoadJob();
+
+        // Subscribe to SignalR entity changes
+        HubService.EntityChanged += OnEntityChanged;
+    }
+
+    private async void OnEntityChanged(string module, string id, string operation)
+    {
+        // Only react if it's a QueueJobs change for this specific job
+        if (module.Equals("QueueJobs", StringComparison.OrdinalIgnoreCase) &&
+            Guid.TryParse(id, out var jobId) && jobId == Id)
+        {
+            Console.WriteLine($"📨 Job {jobId} changed, refreshing detail page");
+            await InvokeAsync(async () =>
+            {
+                await LoadJob();
+                StateHasChanged();
+            });
+        }
     }
 
     private async Task LoadJob()
@@ -242,4 +262,9 @@
             _ => Icons.Material.Filled.Help
         };
     }
+
+    public void Dispose()
+    {
+        HubService.EntityChanged -= OnEntityChanged;
+    }
 }

DiunaBI.UI.Shared/Pages/LayerDetailPage.razor.cs

@@ -439,10 +439,10 @@ public partial class LayerDetailPage : ComponentBase
                 }
                 else
                 {
-                    Snackbar.Add("Job created successfully!", Severity.Success);
+                    Snackbar.Add("Job created successfully! Watch real-time status updates.", Severity.Success);
                 }
 
-                // Navigate to job detail page
+                // Navigate to job detail page to see real-time updates
                 NavigationManager.NavigateTo($"/jobs/{result.JobId}");
             }
             else

DiunaBI.UI.Shared/Services/EntityChangeHubService.cs

@@ -0,0 +1,191 @@
+using Microsoft.AspNetCore.SignalR.Client;
+using Microsoft.Extensions.Logging;
+
+namespace DiunaBI.UI.Shared.Services;
+
+public class EntityChangeHubService : IAsyncDisposable
+{
+    private readonly string _hubUrl;
+    private readonly ILogger<EntityChangeHubService> _logger;
+    private HubConnection? _hubConnection;
+    private bool _isInitialized;
+    private readonly SemaphoreSlim _initializationLock = new SemaphoreSlim(1, 1);
+    private static int _instanceCounter = 0;
+    private readonly int _instanceId;
+
+    // Events that components can subscribe to
+    public event Action<string, string, string>? EntityChanged;
+
+    public EntityChangeHubService(
+        string apiBaseUrl,
+        IServiceProvider serviceProvider,
+        ILogger<EntityChangeHubService> logger)
+    {
+        _instanceId = Interlocked.Increment(ref _instanceCounter);
+
+        // Convert HTTP URL to SignalR hub URL
+        var baseUrl = apiBaseUrl.TrimEnd('/');
+        _hubUrl = baseUrl + "/hubs/entitychanges";
+
+        _logger = logger;
+        _logger.LogInformation("🏗️ EntityChangeHubService instance #{InstanceId} created. Hub URL: {HubUrl}", _instanceId, _hubUrl);
+        Console.WriteLine($"🏗️ EntityChangeHubService instance #{_instanceId} created. Hub URL: {_hubUrl}, _isInitialized = {_isInitialized}");
+    }
+
+    public async Task InitializeAsync()
+    {
+        _logger.LogInformation("🔍 Instance #{InstanceId} InitializeAsync called. _isInitialized = {IsInitialized}, _hubConnection null? {IsNull}", _instanceId, _isInitialized, _hubConnection == null);
+        Console.WriteLine($"🔍 Instance #{_instanceId} InitializeAsync called. _isInitialized = {_isInitialized}, _hubConnection null? {_hubConnection == null}");
+
+        if (_isInitialized)
+        {
+            _logger.LogInformation("⏭️ Instance #{InstanceId} SignalR already initialized, skipping", _instanceId);
+            Console.WriteLine($"⏭️ Instance #{_instanceId} SignalR already initialized, skipping");
+            return;
+        }
+
+        await _initializationLock.WaitAsync();
+        try
+        {
+            // Double-check after acquiring lock
+            if (_isInitialized)
+            {
+                Console.WriteLine($"⏭️ SignalR already initialized (after lock), skipping");
+                return;
+            }
+
+            _logger.LogInformation("🔌 Initializing SignalR connection to {HubUrl}", _hubUrl);
+            Console.WriteLine($"🔌 Initializing SignalR connection to {_hubUrl}");
+
+            _hubConnection = new HubConnectionBuilder()
+                .WithUrl(_hubUrl)
+                .WithAutomaticReconnect()
+                .Build();
+
+            // Subscribe to EntityChanged messages
+            _hubConnection.On<object>("EntityChanged", (data) =>
+            {
+                Console.WriteLine($"🔔 RAW SignalR message received at {DateTime.Now:HH:mm:ss.fff}");
+                Console.WriteLine($"🔔 Data type: {data?.GetType().FullName}");
+
+                try
+                {
+                    // Parse the anonymous object
+                    var json = System.Text.Json.JsonSerializer.Serialize(data);
+                    Console.WriteLine($"📨 Received SignalR message: {json}");
+
+                    // Use case-insensitive deserialization (backend sends camelCase: module, id, operation)
+                    var options = new System.Text.Json.JsonSerializerOptions
+                    {
+                        PropertyNameCaseInsensitive = true
+                    };
+                    var change = System.Text.Json.JsonSerializer.Deserialize<EntityChangeMessage>(json, options);
+
+                    if (change != null)
+                    {
+                        _logger.LogInformation("📨 Received entity change: {Module} {Id} {Operation}",
+                            change.Module, change.Id, change.Operation);
+                        Console.WriteLine($"📨 Entity change: {change.Module} {change.Id} {change.Operation}");
+
+                        // Notify all subscribers
+                        Console.WriteLine($"🔔 Invoking EntityChanged event, subscribers: {EntityChanged?.GetInvocationList().Length ?? 0}");
+                        EntityChanged?.Invoke(change.Module, change.Id, change.Operation);
+                        Console.WriteLine($"🔔 EntityChanged event invoked successfully");
+                    }
+                    else
+                    {
+                        Console.WriteLine($"⚠️ Deserialized change is null");
+                    }
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError(ex, "❌ Error processing entity change message");
+                    Console.WriteLine($"❌ Error processing message: {ex.Message}");
+                    Console.WriteLine($"❌ Stack trace: {ex.StackTrace}");
+                }
+            });
+
+            _hubConnection.Reconnecting += (error) =>
+            {
+                _logger.LogWarning("SignalR reconnecting: {Error}", error?.Message);
+                Console.WriteLine($"⚠️ SignalR reconnecting: {error?.Message}");
+                return Task.CompletedTask;
+            };
+
+            _hubConnection.Reconnected += (connectionId) =>
+            {
+                _logger.LogInformation("✅ SignalR reconnected: {ConnectionId}", connectionId);
+                Console.WriteLine($"✅ SignalR reconnected: {connectionId}");
+                return Task.CompletedTask;
+            };
+
+            _hubConnection.Closed += (error) =>
+            {
+                _logger.LogError(error, "❌ SignalR connection closed");
+                Console.WriteLine($"❌ SignalR connection closed: {error?.Message}");
+                return Task.CompletedTask;
+            };
+
+            await StartConnectionAsync();
+            _isInitialized = true;
+            _logger.LogInformation("✅ Instance #{InstanceId} _isInitialized set to true", _instanceId);
+            Console.WriteLine($"✅ Instance #{_instanceId} _isInitialized set to true");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "❌ Instance #{InstanceId} Failed to initialize SignalR connection", _instanceId);
+            Console.WriteLine($"❌ Instance #{_instanceId} Failed to initialize SignalR: {ex.Message}");
+        }
+        finally
+        {
+            _initializationLock.Release();
+        }
+    }
+
+    private async Task StartConnectionAsync()
+    {
+        if (_hubConnection == null)
+        {
+            _logger.LogWarning("Hub connection is null, cannot start");
+            return;
+        }
+
+        try
+        {
+            Console.WriteLine($"🔌 Starting SignalR connection...");
+            await _hubConnection.StartAsync();
+            _logger.LogInformation("✅ SignalR connected successfully");
+            Console.WriteLine($"✅ SignalR connected successfully to {_hubUrl}");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "❌ Failed to start SignalR connection");
+            Console.WriteLine($"❌ Failed to start SignalR: {ex.Message}\n{ex.StackTrace}");
+        }
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        if (_hubConnection != null)
+        {
+            try
+            {
+                await _hubConnection.StopAsync();
+                await _hubConnection.DisposeAsync();
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Error disposing SignalR connection");
+            }
+        }
+
+        _initializationLock?.Dispose();
+    }
+}
+
+public class EntityChangeMessage
+{
+    public string Module { get; set; } = string.Empty;
+    public string Id { get; set; } = string.Empty;
+    public string Operation { get; set; } = string.Empty;
+}