Update grid column captions to German

Changed "Added" to "Angelegt am" and "Changed" to "Geändert am" in the data grid column headers for improved localization. No other column settings were modified.

DbFirst.API/Controllers/MassDataController.cs

@@ -0,0 +1,53 @@
+using DbFirst.Application.MassData;
+using DbFirst.Application.MassData.Commands;
+using DbFirst.Application.MassData.Queries;
+using MediatR;
+using Microsoft.AspNetCore.Mvc;
+
+namespace DbFirst.API.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+public class MassDataController : ControllerBase
+{
+    private readonly IMediator _mediator;
+
+    public MassDataController(IMediator mediator)
+    {
+        _mediator = mediator;
+    }
+
+    [HttpGet("count")]
+    public async Task<ActionResult<int>> GetCount(CancellationToken cancellationToken)
+    {
+        var count = await _mediator.Send(new GetMassDataCountQuery(), cancellationToken);
+        return Ok(count);
+    }
+
+    [HttpGet]
+    public async Task<ActionResult<IEnumerable<MassDataReadDto>>> GetAll([FromQuery] int? skip, [FromQuery] int? take, CancellationToken cancellationToken)
+    {
+        var resolvedTake = take is null or <= 0 ? 200 : take;
+        var result = await _mediator.Send(new GetAllMassDataQuery(skip, resolvedTake), cancellationToken);
+        return Ok(result);
+    }
+
+    [HttpGet("{customerName}")]
+    public async Task<ActionResult<MassDataReadDto>> GetByCustomerName(string customerName, CancellationToken cancellationToken)
+    {
+        var result = await _mediator.Send(new GetMassDataByCustomerNameQuery(customerName), cancellationToken);
+        if (result == null)
+        {
+            return NotFound();
+        }
+
+        return Ok(result);
+    }
+
+    [HttpPost("upsert")]
+    public async Task<ActionResult<MassDataReadDto>> Upsert(MassDataWriteDto dto, CancellationToken cancellationToken)
+    {
+        var result = await _mediator.Send(new UpsertMassDataByCustomerNameCommand(dto), cancellationToken);
+        return Ok(result);
+    }
+}

DbFirst.API/Dashboards/DashboardChangeNotifier.cs

@@ -0,0 +1,19 @@
+using DbFirst.API.Hubs;
+using Microsoft.AspNetCore.SignalR;
+
+namespace DbFirst.API.Dashboards;
+
+public class DashboardChangeNotifier : IDashboardChangeNotifier
+{
+    private readonly IHubContext<DashboardsHub> _hubContext;
+
+    public DashboardChangeNotifier(IHubContext<DashboardsHub> hubContext)
+    {
+        _hubContext = hubContext;
+    }
+
+    public void NotifyChanged()
+    {
+        _ = _hubContext.Clients.All.SendAsync("DashboardsChanged");
+    }
+}

DbFirst.API/Dashboards/IDashboardChangeNotifier.cs

@@ -0,0 +1,6 @@
+namespace DbFirst.API.Dashboards;
+
+public interface IDashboardChangeNotifier
+{
+    void NotifyChanged();
+}

DbFirst.API/Dashboards/SqlDashboardStorage.cs

@@ -11,12 +11,14 @@ public sealed class SqlDashboardStorage : IEditableDashboardStorage
     private readonly string _connectionString;
     private readonly string _tableName;
     private readonly Func<string?>? _userProvider;
+    private readonly IDashboardChangeNotifier? _notifier;
 
-    public SqlDashboardStorage(string connectionString, string tableName = "TBDD_SMF_CONFIG", Func<string?>? userProvider = null)
+    public SqlDashboardStorage(string connectionString, string tableName = "TBDD_SMF_CONFIG", Func<string?>? userProvider = null, IDashboardChangeNotifier? notifier = null)
     {
         _connectionString = connectionString;
         _tableName = tableName;
         _userProvider = userProvider;
+        _notifier = notifier;
     }
 
     public IEnumerable<DashboardInfo> GetAvailableDashboardsInfo()
@@ -98,6 +100,7 @@ public sealed class SqlDashboardStorage : IEditableDashboardStorage
 
         connection.Open();
         command.ExecuteNonQuery();
+        _notifier?.NotifyChanged();
         return id;
     }
 
@@ -118,6 +121,8 @@ public sealed class SqlDashboardStorage : IEditableDashboardStorage
         {
             throw new ArgumentException($"Dashboard '{dashboardId}' not found.");
         }
+
+        _notifier?.NotifyChanged();
     }
 
     public void DeleteDashboard(string dashboardId)
@@ -128,5 +133,6 @@ public sealed class SqlDashboardStorage : IEditableDashboardStorage
 
         connection.Open();
         command.ExecuteNonQuery();
+        _notifier?.NotifyChanged();
     }
 }

DbFirst.API/Hubs/DashboardsHub.cs

@@ -0,0 +1,7 @@
+using Microsoft.AspNetCore.SignalR;
+
+namespace DbFirst.API.Hubs;
+
+public class DashboardsHub : Hub
+{
+}

DbFirst.API/Program.cs

@@ -1,5 +1,6 @@
 using DbFirst.API.Middleware;
 using DbFirst.API.Dashboards;
+using DbFirst.API.Hubs;
 using DbFirst.Application;
 using DbFirst.Application.Repositories;
 using DbFirst.Domain;
@@ -51,8 +52,11 @@ builder.Services.AddInfrastructure(builder.Configuration);
 builder.Services.AddApplication();
 
 builder.Services.AddScoped<ICatalogRepository, CatalogRepository>();
+builder.Services.AddScoped<IMassDataRepository, MassDataRepository>();
 
 builder.Services.AddDevExpressControls();
+builder.Services.AddSignalR();
+builder.Services.AddSingleton<IDashboardChangeNotifier, DashboardChangeNotifier>();
 builder.Services.AddScoped<DashboardConfigurator>((IServiceProvider serviceProvider) => {
     var dashboardsPath = Path.Combine(builder.Environment.ContentRootPath, "Data", "Dashboards");
     Directory.CreateDirectory(dashboardsPath);
@@ -112,7 +116,8 @@ builder.Services.AddScoped<DashboardConfigurator>((IServiceProvider serviceProvi
     DashboardConfigurator configurator = new DashboardConfigurator();
 
     var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? string.Empty;
-    var dashboardStorage = new SqlDashboardStorage(connectionString, "TBDD_SMF_CONFIG");
+    var notifier = serviceProvider.GetRequiredService<IDashboardChangeNotifier>();
+    var dashboardStorage = new SqlDashboardStorage(connectionString, "TBDD_SMF_CONFIG", notifier: notifier);
     configurator.SetDashboardStorage(dashboardStorage);
 
     DataSourceInMemoryStorage dataSourceStorage = new DataSourceInMemoryStorage();
@@ -155,7 +160,7 @@ app.UseCors();
 app.UseAuthorization();
 
 app.MapDashboardRoute("api/dashboard", "DefaultDashboard");
-
+app.MapHub<DashboardsHub>("/hubs/dashboards");
 app.MapControllers();
 
 app.Run();

DbFirst.API/appsettings.json

@@ -1,6 +1,7 @@
 {
   "ConnectionStrings": {
-    "DefaultConnection": "Server=SDD-VMP04-SQL17\\DD_DEVELOP01;Database=DD_ECM;User Id=sa;Password=dd;TrustServerCertificate=True;"
+    "DefaultConnection": "Server=SDD-VMP04-SQL17\\DD_DEVELOP01;Database=DD_ECM;User Id=sa;Password=dd;TrustServerCertificate=True;",
+    "MassDataConnection": "Server=SDD-VMP04-SQL19\\DD_DEVELOP01;Database=DD_ECM;User Id=sa;Password=dd;TrustServerCertificate=True;"
   },
   "Dashboard": {
     "BaseUrl": "https://localhost:7204"

DbFirst.Application/MassData/Commands/UpsertMassDataByCustomerNameCommand.cs

@@ -0,0 +1,5 @@
+using MediatR;
+
+namespace DbFirst.Application.MassData.Commands;
+
+public record UpsertMassDataByCustomerNameCommand(MassDataWriteDto Dto) : IRequest<MassDataReadDto>;

DbFirst.Application/MassData/Commands/UpsertMassDataByCustomerNameHandler.cs

@@ -0,0 +1,24 @@
+using AutoMapper;
+using DbFirst.Application.Repositories;
+using MediatR;
+
+namespace DbFirst.Application.MassData.Commands;
+
+public class UpsertMassDataByCustomerNameHandler : IRequestHandler<UpsertMassDataByCustomerNameCommand, MassDataReadDto>
+{
+    private readonly IMassDataRepository _repository;
+    private readonly IMapper _mapper;
+
+    public UpsertMassDataByCustomerNameHandler(IMassDataRepository repository, IMapper mapper)
+    {
+        _repository = repository;
+        _mapper = mapper;
+    }
+
+    public async Task<MassDataReadDto> Handle(UpsertMassDataByCustomerNameCommand request, CancellationToken cancellationToken)
+    {
+        var dto = request.Dto;
+        var updated = await _repository.UpsertByCustomerNameAsync(dto.CustomerName, dto.Amount, dto.StatusFlag, dto.Category, cancellationToken);
+        return _mapper.Map<MassDataReadDto>(updated);
+    }
+}

DbFirst.Application/MassData/MassDataProfile.cs

@@ -0,0 +1,12 @@
+using AutoMapper;
+using DbFirst.Domain.Entities;
+
+namespace DbFirst.Application.MassData;
+
+public class MassDataProfile : Profile
+{
+    public MassDataProfile()
+    {
+        CreateMap<Massdata, MassDataReadDto>();
+    }
+}

DbFirst.Application/MassData/MassDataReadDto.cs

@@ -0,0 +1,12 @@
+namespace DbFirst.Application.MassData;
+
+public class MassDataReadDto
+{
+    public int Id { get; set; }
+    public string CustomerName { get; set; } = string.Empty;
+    public decimal Amount { get; set; }
+    public string Category { get; set; } = string.Empty;
+    public bool StatusFlag { get; set; }
+    public DateTime AddedWhen { get; set; }
+    public DateTime? ChangedWhen { get; set; }
+}

DbFirst.Application/MassData/MassDataWriteDto.cs

@@ -0,0 +1,9 @@
+namespace DbFirst.Application.MassData;
+
+public class MassDataWriteDto
+{
+    public string CustomerName { get; set; } = string.Empty;
+    public decimal Amount { get; set; }
+    public string Category { get; set; } = string.Empty;
+    public bool StatusFlag { get; set; }
+}

DbFirst.Application/MassData/Queries/GetAllMassDataHandler.cs

@@ -0,0 +1,23 @@
+using AutoMapper;
+using DbFirst.Application.Repositories;
+using MediatR;
+
+namespace DbFirst.Application.MassData.Queries;
+
+public class GetAllMassDataHandler : IRequestHandler<GetAllMassDataQuery, List<MassDataReadDto>>
+{
+    private readonly IMassDataRepository _repository;
+    private readonly IMapper _mapper;
+
+    public GetAllMassDataHandler(IMassDataRepository repository, IMapper mapper)
+    {
+        _repository = repository;
+        _mapper = mapper;
+    }
+
+    public async Task<List<MassDataReadDto>> Handle(GetAllMassDataQuery request, CancellationToken cancellationToken)
+    {
+        var items = await _repository.GetAllAsync(request.Skip, request.Take, cancellationToken);
+        return _mapper.Map<List<MassDataReadDto>>(items);
+    }
+}

DbFirst.Application/MassData/Queries/GetAllMassDataQuery.cs

@@ -0,0 +1,5 @@
+using MediatR;
+
+namespace DbFirst.Application.MassData.Queries;
+
+public record GetAllMassDataQuery(int? Skip, int? Take) : IRequest<List<MassDataReadDto>>;

DbFirst.Application/MassData/Queries/GetMassDataByCustomerNameHandler.cs

@@ -0,0 +1,23 @@
+using AutoMapper;
+using DbFirst.Application.Repositories;
+using MediatR;
+
+namespace DbFirst.Application.MassData.Queries;
+
+public class GetMassDataByCustomerNameHandler : IRequestHandler<GetMassDataByCustomerNameQuery, MassDataReadDto?>
+{
+    private readonly IMassDataRepository _repository;
+    private readonly IMapper _mapper;
+
+    public GetMassDataByCustomerNameHandler(IMassDataRepository repository, IMapper mapper)
+    {
+        _repository = repository;
+        _mapper = mapper;
+    }
+
+    public async Task<MassDataReadDto?> Handle(GetMassDataByCustomerNameQuery request, CancellationToken cancellationToken)
+    {
+        var item = await _repository.GetByCustomerNameAsync(request.CustomerName, cancellationToken);
+        return item == null ? null : _mapper.Map<MassDataReadDto>(item);
+    }
+}

DbFirst.Application/MassData/Queries/GetMassDataByCustomerNameQuery.cs

@@ -0,0 +1,5 @@
+using MediatR;
+
+namespace DbFirst.Application.MassData.Queries;
+
+public record GetMassDataByCustomerNameQuery(string CustomerName) : IRequest<MassDataReadDto?>;

DbFirst.Application/MassData/Queries/GetMassDataCountHandler.cs

@@ -0,0 +1,19 @@
+using DbFirst.Application.Repositories;
+using MediatR;
+
+namespace DbFirst.Application.MassData.Queries;
+
+public class GetMassDataCountHandler : IRequestHandler<GetMassDataCountQuery, int>
+{
+    private readonly IMassDataRepository _repository;
+
+    public GetMassDataCountHandler(IMassDataRepository repository)
+    {
+        _repository = repository;
+    }
+
+    public async Task<int> Handle(GetMassDataCountQuery request, CancellationToken cancellationToken)
+    {
+        return await _repository.GetCountAsync(cancellationToken);
+    }
+}

DbFirst.Application/MassData/Queries/GetMassDataCountQuery.cs

@@ -0,0 +1,5 @@
+using MediatR;
+
+namespace DbFirst.Application.MassData.Queries;
+
+public record GetMassDataCountQuery : IRequest<int>;

DbFirst.Application/Repositories/IMassDataRepository.cs

@@ -0,0 +1,11 @@
+using DbFirst.Domain.Entities;
+
+namespace DbFirst.Application.Repositories;
+
+public interface IMassDataRepository
+{
+    Task<int> GetCountAsync(CancellationToken cancellationToken = default);
+    Task<List<Massdata>> GetAllAsync(int? skip = null, int? take = null, CancellationToken cancellationToken = default);
+    Task<Massdata?> GetByCustomerNameAsync(string customerName, CancellationToken cancellationToken = default);
+    Task<Massdata> UpsertByCustomerNameAsync(string customerName, decimal amount, bool statusFlag, string category, CancellationToken cancellationToken = default);
+}

DbFirst.BlazorWasm/Components/CatalogsGrid.razor

@@ -1,3 +1,4 @@
+@using Microsoft.AspNetCore.Components.Forms
 @inject CatalogApiClient Api
 
 <style>
@@ -44,6 +45,9 @@
         background-position: right 0.5rem center;
         background-size: 0.9rem;
     }
+    .catalog-edit-popup {
+        min-width: 720px;
+    }
 </style>
 
 @if (!string.IsNullOrWhiteSpace(errorMessage))
@@ -55,41 +59,6 @@ else if (!string.IsNullOrWhiteSpace(infoMessage))
     <div class="alert alert-success" role="alert">@infoMessage</div>
 }
 
-<div class="mb-3">
-    <DxButton RenderStyle="ButtonRenderStyle.Primary" Click="@StartCreate">Neuen Eintrag anlegen</DxButton>
-</div>
-
-@if (showForm)
-{
-    <div class="action-panel">
-        <EditForm Model="formModel" OnValidSubmit="HandleSubmit" Context="editCtx">
-            <DxFormLayout ColCount="2">
-                <DxFormLayoutItem Caption="Titel" Context="itemCtx">
-                    <DxTextBox @bind-Text="formModel.CatTitle" Enabled="@(isEditing ? formModel.UpdateProcedure != 0 : true)" />
-                </DxFormLayoutItem>
-                <DxFormLayoutItem Caption="Kennung" Context="itemCtx">
-                    <DxTextBox @bind-Text="formModel.CatString" />
-                </DxFormLayoutItem>
-                @if (isEditing)
-                {
-                    <DxFormLayoutItem Caption="Update-Prozedur" Context="itemCtx">
-                        <DxComboBox Data="@procedureOptions"
-                                    TextFieldName="Text"
-                                    ValueFieldName="Value"
-                                    @bind-Value="formModel.UpdateProcedure" />
-                    </DxFormLayoutItem>
-                }
-                <DxFormLayoutItem Caption=" " Context="itemCtx">
-                    <DxStack Orientation="Orientation.Horizontal" Spacing="8">
-                        <DxButton RenderStyle="ButtonRenderStyle.Success" ButtonType="ButtonType.Submit" SubmitFormOnClick="true" Context="btnCtx">@((isEditing ? "Speichern" : "Anlegen"))</DxButton>
-                        <DxButton RenderStyle="ButtonRenderStyle.Secondary" Click="@CancelEdit" Context="btnCtx">Abbrechen</DxButton>
-                    </DxStack>
-                </DxFormLayoutItem>
-            </DxFormLayout>
-        </EditForm>
-    </div>
-}
-
 @if (isLoading)
 {
     <p><em>Lade Daten...</em></p>
@@ -101,8 +70,20 @@ else if (items.Count == 0)
 else
 {
     <div class="grid-section">
-        <DxGrid Data="@items" TItem="CatalogReadDto" KeyFieldName="@nameof(CatalogReadDto.Guid)" ShowFilterRow="true" PageSize="10" CssClass="mb-4 catalog-grid">
+        <DxGrid Data="@items"
+                TItem="CatalogReadDto"
+                KeyFieldName="@nameof(CatalogReadDto.Guid)"
+                ShowFilterRow="true"
+                PageSize="10"
+                CssClass="mb-4 catalog-grid"
+                EditMode="GridEditMode.PopupEditForm"
+                PopupEditFormCssClass="catalog-edit-popup"
+                PopupEditFormHeaderText="@popupHeaderText"
+                CustomizeEditModel="OnCustomizeEditModel"
+                EditModelSaving="OnEditModelSaving"
+                DataItemDeleting="OnDataItemDeleting">
             <Columns>
+                <DxGridCommandColumn Width="120px" />
                 <DxGridDataColumn FieldName="@nameof(CatalogReadDto.Guid)" Caption="Id" Width="140px" SortIndex="0" SortOrder="GridColumnSortOrder.Ascending">
                     <FilterRowCellTemplate Context="filter">
                         <DxTextBox Text="@(filter.FilterRowValue?.ToString())"
@@ -124,45 +105,73 @@ else
                                    CssClass="filter-search-input" />
                     </FilterRowCellTemplate>
                 </DxGridDataColumn>
-                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.AddedWho)" Caption="Angelegt von">
+                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.AddedWho)" Caption="Angelegt von" ReadOnly="true">
                     <FilterRowCellTemplate Context="filter">
                         <DxTextBox Text="@(filter.FilterRowValue as string)"
                                    TextChanged="@(value => filter.FilterRowValue = value)"
                                    CssClass="filter-search-input" />
                     </FilterRowCellTemplate>
                 </DxGridDataColumn>
-                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.AddedWhen)" Caption="Angelegt am" />
-                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.ChangedWho)" Caption="Geändert von">
+                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.AddedWhen)" Caption="Angelegt am" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxDateEdit Date="@((DateTime?)filter.FilterRowValue)"
+                                    DateChanged="@((DateTime? value) => { filter.FilterRowValue = value; })"
+                                    Width="100%" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.ChangedWho)" Caption="Geändert von" ReadOnly="true">
                     <FilterRowCellTemplate Context="filter">
                         <DxTextBox Text="@(filter.FilterRowValue as string)"
                                    TextChanged="@(value => filter.FilterRowValue = value)"
                                    CssClass="filter-search-input" />
                     </FilterRowCellTemplate>
                 </DxGridDataColumn>
-                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.ChangedWhen)" Caption="Geändert am" />
-                <DxGridDataColumn Caption="" Width="220px" AllowSort="false">
-                    <CellDisplayTemplate Context="cell">
-                        @{ var item = (CatalogReadDto)cell.DataItem; }
-                        <div style="white-space: nowrap;">
-                            <DxButton RenderStyle="ButtonRenderStyle.Secondary" Size="ButtonSize.Small" Click="@(() => StartEdit(item))">Bearbeiten</DxButton>
-                            <DxButton RenderStyle="ButtonRenderStyle.Danger" Size="ButtonSize.Small" Click="@(() => DeleteCatalog(item.Guid))">Löschen</DxButton>
-                        </div>
-                    </CellDisplayTemplate>
+                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.ChangedWhen)" Caption="Geändert am" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxDateEdit Date="@((DateTime?)filter.FilterRowValue)"
+                                    DateChanged="@((DateTime? value) => { filter.FilterRowValue = value; })"
+                                    Width="100%" />
+                    </FilterRowCellTemplate>
                 </DxGridDataColumn>
             </Columns>
+            <EditFormTemplate Context="editFormContext">
+                @{ SetEditContext(editFormContext.EditContext); var editModel = (CatalogEditModel)editFormContext.EditModel; SetPopupHeaderText(editModel.IsNew); }
+                <DxFormLayout ColCount="2">
+                    <DxFormLayoutItem Caption="Titel">
+                        <DxTextBox @bind-Text="editModel.CatTitle" Width="100%" />
+                    </DxFormLayoutItem>
+                    <DxFormLayoutItem Caption="Kennung">
+                        <DxTextBox @bind-Text="editModel.CatString" Width="100%" />
+                    </DxFormLayoutItem>
+                    @if (!editModel.IsNew)
+                    {
+                        <DxFormLayoutItem Caption="Update-Prozedur">
+                            <DxComboBox Data="@procedureOptions"
+                                        TData="ProcedureOption"
+                                        TValue="int"
+                                        TextFieldName="Text"
+                                        ValueFieldName="Value"
+                                        @bind-Value="editModel.UpdateProcedure"
+                                        Width="100%" />
+                        </DxFormLayoutItem>
+                    }
+                    <DxFormLayoutItem ColSpanMd="12">
+                        <ValidationSummary />
+                    </DxFormLayoutItem>
+                </DxFormLayout>
+            </EditFormTemplate>
         </DxGrid>
     </div>
 }
 
 @code {
     private List<CatalogReadDto> items = new();
-    private CatalogWriteDto formModel = new();
-    private int editingId;
     private bool isLoading;
-    private bool isEditing;
-    private bool showForm;
     private string? errorMessage;
     private string? infoMessage;
+    private EditContext? editContext;
+    private ValidationMessageStore? validationMessageStore;
+    private string popupHeaderText = "Edit";
 
     private readonly List<ProcedureOption> procedureOptions = new()
     {
@@ -175,6 +184,66 @@ else
         await LoadCatalogs();
     }
 
+    private void SetEditContext(EditContext context)
+    {
+        if (editContext == context)
+        {
+            return;
+        }
+
+        if (editContext != null)
+        {
+            editContext.OnFieldChanged -= OnEditFieldChanged;
+        }
+
+        editContext = context;
+        validationMessageStore = new ValidationMessageStore(editContext);
+        editContext.OnFieldChanged += OnEditFieldChanged;
+    }
+
+    private void OnEditFieldChanged(object? sender, FieldChangedEventArgs e)
+    {
+        if (validationMessageStore == null || editContext == null)
+        {
+            return;
+        }
+
+        if (e.FieldIdentifier.FieldName == nameof(CatalogEditModel.UpdateProcedure))
+        {
+            validationMessageStore.Clear();
+            editContext.NotifyValidationStateChanged();
+            return;
+        }
+
+        if (e.FieldIdentifier.FieldName == nameof(CatalogEditModel.CatTitle))
+        {
+            var field = new FieldIdentifier(editContext.Model, nameof(CatalogEditModel.CatTitle));
+            validationMessageStore.Clear(field);
+            editContext.NotifyValidationStateChanged();
+        }
+    }
+
+    private void OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
+    {
+        popupHeaderText = e.IsNew ? "Neu" : "Edit";
+        if (e.IsNew)
+        {
+            e.EditModel = new CatalogEditModel { IsNew = true };
+            return;
+        }
+
+        var item = (CatalogReadDto)e.DataItem;
+        e.EditModel = new CatalogEditModel
+        {
+            Guid = item.Guid,
+            CatTitle = item.CatTitle,
+            CatString = item.CatString,
+            UpdateProcedure = 0,
+            OriginalCatTitle = item.CatTitle,
+            IsNew = false
+        };
+    }
+
     private async Task LoadCatalogs()
     {
         isLoading = true;
@@ -194,88 +263,115 @@ else
         }
     }
 
-    private void StartCreate()
+    private async Task OnEditModelSaving(GridEditModelSavingEventArgs e)
     {
-        formModel = new CatalogWriteDto();
-        editingId = 0;
-        isEditing = false;
-        showForm = true;
-        infoMessage = null;
         errorMessage = null;
-    }
+        infoMessage = null;
 
-    private void StartEdit(CatalogReadDto item)
-    {
-        formModel = new CatalogWriteDto
+        validationMessageStore?.Clear();
+        editContext?.NotifyValidationStateChanged();
+
+        var editModel = (CatalogEditModel)e.EditModel;
+        if (!ValidateEditModel(editModel, e.IsNew))
         {
-            CatTitle = item.CatTitle,
-            CatString = item.CatString,
-            UpdateProcedure = 0
-        };
-        editingId = item.Guid;
-        isEditing = true;
-        showForm = true;
-        infoMessage = null;
-        errorMessage = null;
-    }
+            e.Cancel = true;
+            return;
+        }
 
-    private async Task HandleSubmit()
-    {
-        errorMessage = null;
-        infoMessage = null;
+        var dto = new CatalogWriteDto
+        {
+            CatTitle = editModel.CatTitle,
+            CatString = editModel.CatString,
+            UpdateProcedure = editModel.UpdateProcedure
+        };
 
         try
         {
-            if (isEditing)
+            if (e.IsNew)
             {
-                var updated = await Api.UpdateAsync(editingId, formModel);
-                if (!updated.Success)
-                {
-                    errorMessage = updated.Error ?? "Aktualisierung fehlgeschlagen.";
-                    return;
-                }
-
-                infoMessage = "Katalog aktualisiert.";
-            }
-            else
-            {
-                var created = await Api.CreateAsync(formModel);
+                var created = await Api.CreateAsync(dto);
                 if (!created.Success || created.Value == null)
                 {
-                    errorMessage = created.Error ?? "Anlegen fehlgeschlagen.";
+                    if (!string.IsNullOrWhiteSpace(created.Error))
+                    {
+                        AddValidationError(editModel, nameof(CatalogEditModel.CatTitle), created.Error);
+                    }
+                    else
+                    {
+                        errorMessage = "Anlegen fehlgeschlagen.";
+                    }
+
+                    e.Cancel = true;
                     return;
                 }
 
                 infoMessage = "Katalog angelegt.";
             }
+            else
+            {
+                var updated = await Api.UpdateAsync(editModel.Guid, dto);
+                if (!updated.Success)
+                {
+                    errorMessage = updated.Error ?? "Aktualisierung fehlgeschlagen.";
+                    e.Cancel = true;
+                    return;
+                }
+
+                infoMessage = "Katalog aktualisiert.";
+            }
 
-            showForm = false;
             await LoadCatalogs();
         }
         catch (Exception ex)
         {
             errorMessage = $"Fehler beim Speichern: {ex.Message}";
+            e.Cancel = true;
         }
     }
 
-    private void CancelEdit()
+    private void AddValidationError(CatalogEditModel editModel, string fieldName, string message)
     {
-        showForm = false;
-        infoMessage = null;
-        errorMessage = null;
+        if (editContext == null || validationMessageStore == null)
+        {
+            return;
+        }
+
+        var field = new FieldIdentifier(editModel, fieldName);
+        validationMessageStore.Add(field, message);
+        editContext.NotifyValidationStateChanged();
     }
 
-    private async Task DeleteCatalog(int id)
+    private bool ValidateEditModel(CatalogEditModel editModel, bool isNew)
+    {
+        if (isNew)
+        {
+            return true;
+        }
+
+        if (editModel.UpdateProcedure == 0 &&
+            !string.Equals(editModel.CatTitle, editModel.OriginalCatTitle, StringComparison.OrdinalIgnoreCase))
+        {
+            AddValidationError(editModel, nameof(CatalogEditModel.CatTitle), "Titel kann nicht geändert werden.");
+            return false;
+        }
+
+        return true;
+    }
+
+    private async Task OnDataItemDeleting(GridDataItemDeletingEventArgs e)
     {
         errorMessage = null;
         infoMessage = null;
 
+        var item = (CatalogReadDto)e.DataItem;
+
         try
         {
-            var deleted = await Api.DeleteAsync(id);
+            var deleted = await Api.DeleteAsync(item.Guid);
             if (!deleted.Success)
             {
                 errorMessage = deleted.Error ?? "Löschen fehlgeschlagen.";
+                e.Cancel = true;
                 return;
             }
 
@@ -285,9 +381,25 @@ else
         catch (Exception ex)
         {
             errorMessage = $"Fehler beim Löschen: {ex.Message}";
+            e.Cancel = true;
         }
     }
 
+    private void SetPopupHeaderText(bool isNew)
+    {
+        popupHeaderText = isNew ? "Neu" : "Edit";
+    }
+
+    private sealed class CatalogEditModel
+    {
+        public int Guid { get; set; }
+        public string CatTitle { get; set; } = string.Empty;
+        public string CatString { get; set; } = string.Empty;
+        public int UpdateProcedure { get; set; }
+        public string OriginalCatTitle { get; set; } = string.Empty;
+        public bool IsNew { get; set; }
+    }
+
     private sealed class ProcedureOption
     {
         public int Value { get; set; }

DbFirst.BlazorWasm/Components/MassDataGrid.razor

@@ -0,0 +1,408 @@
+@using Microsoft.AspNetCore.Components.Forms
+@inject MassDataApiClient Api
+
+<style>
+    .action-panel { margin-bottom: 16px; }
+    .grid-section { margin-top: 12px; }
+    .pager-container {
+        display: flex;
+        justify-content: center;
+        margin-top: 12px;
+        margin-bottom: 16px;
+    }
+    .massdata-grid .dxbl-grid-sort-asc,
+    .massdata-grid .dxbl-grid-sort-desc {
+        display: none;
+    }
+    .massdata-grid th.dxbl-grid-header-sortable {
+        position: relative;
+        padding-right: 1.5rem;
+    }
+    .massdata-grid th.dxbl-grid-header-sortable::before,
+    .massdata-grid th.dxbl-grid-header-sortable::after {
+        content: "";
+        position: absolute;
+        right: 0.45rem;
+        width: 0.7rem;
+        height: 0.7rem;
+        background-repeat: no-repeat;
+        background-size: 0.7rem 0.7rem;
+        opacity: 0.35;
+        pointer-events: none;
+    }
+    .massdata-grid th.dxbl-grid-header-sortable::before {
+        top: 38%;
+        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.957 10.999a1 1 0 0 1-.821-1.571l2.633-3.785a1.5 1.5 0 0 1 2.462 0l2.633 3.785a1 1 0 0 1-.821 1.57H4.957Z' fill='%23888888'/%3E%3C/svg%3E");
+    }
+    .massdata-grid th.dxbl-grid-header-sortable::after {
+        top: 58%;
+        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.957 5a1 1 0 0 0-.821 1.571l2.633 3.784a1.5 1.5 0 0 0 2.462 0l2.633-3.784A1 1 0 0 0 11.043 5H4.957Z' fill='%23888888'/%3E%3C/svg%3E");
+    }
+    .massdata-grid th.dxbl-grid-header-sortable[aria-sort="ascending"]::after {
+        opacity: 0;
+    }
+    .massdata-grid th.dxbl-grid-header-sortable[aria-sort="descending"]::before {
+        opacity: 0;
+    }
+    .massdata-grid .filter-search-input input {
+        padding-right: 1.75rem;
+        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M9.309 10.016a4.5 4.5 0 1 1 .707-.707l3.838 3.837a.5.5 0 0 1-.708.708L9.31 10.016ZM10 6.5a3.5 3.5 0 1 0-7 0 3.5 3.5 0 0 0 7 0Z' fill='%23666666'/%3E%3C/svg%3E");
+        background-repeat: no-repeat;
+        background-position: right 0.5rem center;
+        background-size: 0.9rem;
+    }
+    .massdata-edit-popup {
+        min-width: 720px;
+    }
+</style>
+
+@if (!string.IsNullOrWhiteSpace(errorMessage))
+{
+    <div class="alert alert-danger" role="alert">@errorMessage</div>
+}
+else if (!string.IsNullOrWhiteSpace(infoMessage))
+{
+    <div class="alert alert-success" role="alert">@infoMessage</div>
+}
+
+@if (isLoading)
+{
+    <p><em>Lade Daten...</em></p>
+}
+else if (items.Count == 0)
+{
+    <p>Keine Einträge vorhanden.</p>
+}
+else
+{
+    <div class="grid-section">
+        <DxGrid Data="@items"
+                TItem="MassDataReadDto"
+                KeyFieldName="@nameof(MassDataReadDto.Id)"
+                ShowFilterRow="true"
+                ShowGroupPanel="true"
+                AllowColumnResize="true"
+                PagerVisible="false"
+                PageSize="100"
+                CssClass="mb-3 massdata-grid"
+                EditMode="GridEditMode.PopupEditForm"
+                PopupEditFormCssClass="massdata-edit-popup"
+                PopupEditFormHeaderText="@popupHeaderText"
+                CustomizeEditModel="OnCustomizeEditModel"
+                EditModelSaving="OnEditModelSaving"
+                DataItemDeleting="OnDataItemDeleting">
+            <Columns>
+                <DxGridCommandColumn Width="120px" />
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.Id)" Caption="Id" Width="90px" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue?.ToString())"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.CustomerName)" Caption="CustomerName">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue as string)"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.Amount)" Caption="Amount" DisplayFormat="c2">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue?.ToString())"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.Category)" Caption="Category" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue as string)"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.StatusFlag)" Caption="Status" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxComboBox Data="@statusFilterOptions"
+                                    TData="BoolFilterOption"
+                                    TValue="bool?"
+                                    TextFieldName="Text"
+                                    ValueFieldName="Value"
+                                    Value="@(filter.FilterRowValue as bool?)"
+                                    ValueChanged="@(value => filter.FilterRowValue = value)"
+                                    Width="100%" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.AddedWhen)" Caption="Angelegt am" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxDateEdit Date="@((DateTime?)filter.FilterRowValue)"
+                                    DateChanged="@((DateTime? value) => { filter.FilterRowValue = value; })"
+                                    Width="100%" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.ChangedWhen)" Caption="Geändert am" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxDateEdit Date="@((DateTime?)filter.FilterRowValue)"
+                                    DateChanged="@((DateTime? value) => { filter.FilterRowValue = value; })"
+                                    Width="100%" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+            </Columns>
+            <EditFormTemplate Context="editFormContext">
+                @{ SetEditContext(editFormContext.EditContext); var editModel = (MassDataEditModel)editFormContext.EditModel; SetPopupHeaderText(editModel.IsNew); }
+                <DxFormLayout ColCount="2">
+                    <DxFormLayoutItem Caption="CustomerName">
+                        <DxTextBox @bind-Text="editModel.CustomerName" Width="100%" />
+                    </DxFormLayoutItem>
+                    <DxFormLayoutItem Caption="Amount">
+                        <DxTextBox @bind-Text="editModel.AmountText" Width="100%" />
+                    </DxFormLayoutItem>
+                    <DxFormLayoutItem Caption="Category">
+                        <DxTextBox @bind-Text="editModel.Category" Width="100%" ReadOnly="@(!editModel.IsNew)" />
+                    </DxFormLayoutItem>
+                    <DxFormLayoutItem Caption="Status">
+                        <DxCheckBox @bind-Checked="editModel.StatusFlag" ReadOnly="@(!editModel.IsNew)" />
+                    </DxFormLayoutItem>
+                    @if (!editModel.IsNew)
+                    {
+                        <DxFormLayoutItem Caption="Prozedur">
+                            <DxComboBox Data="@procedureOptions"
+                                        TData="ProcedureOption"
+                                        TValue="int"
+                                        TextFieldName="Text"
+                                        ValueFieldName="Value"
+                                        @bind-Value="editModel.UpdateProcedure"
+                                        Width="100%" />
+                        </DxFormLayoutItem>
+                    }
+                    <DxFormLayoutItem ColSpanMd="12">
+                        <ValidationSummary />
+                    </DxFormLayoutItem>
+                </DxFormLayout>
+            </EditFormTemplate>
+        </DxGrid>
+
+        <div class="pager-container">
+            <DxPager PageCount="@pageCount" ActivePageIndex="@pageIndex" ActivePageIndexChanged="OnPageChanged" />
+        </div>
+    </div>
+}
+
+@code {
+    private const int PageSize = 100;
+    private List<MassDataReadDto> items = new();
+    private bool isLoading;
+    private string? errorMessage;
+    private string? infoMessage;
+    private int pageIndex;
+    private int pageCount = 1;
+    private string popupHeaderText = "Edit";
+    private EditContext? editContext;
+    private ValidationMessageStore? validationMessageStore;
+
+    private readonly List<BoolFilterOption> statusFilterOptions = new()
+    {
+        new() { Value = null, Text = "Alle" },
+        new() { Value = true, Text = "True" },
+        new() { Value = false, Text = "False" }
+    };
+
+    private readonly List<ProcedureOption> procedureOptions = new()
+    {
+        new() { Value = 0, Text = "PRMassdata_UpsertByCustomerName" }
+    };
+
+    protected override async Task OnInitializedAsync()
+    {
+        await LoadPage(0);
+    }
+
+    private async Task LoadPage(int page)
+    {
+        isLoading = true;
+        errorMessage = null;
+        try
+        {
+            var total = await Api.GetCountAsync();
+            pageCount = Math.Max(1, (int)Math.Ceiling(total / (double)PageSize));
+            pageIndex = Math.Clamp(page, 0, pageCount - 1);
+
+            var skip = pageIndex * PageSize;
+            items = await Api.GetAllAsync(skip, PageSize);
+        }
+        catch (Exception ex)
+        {
+            errorMessage = $"MassData konnten nicht geladen werden: {ex.Message}";
+        }
+        finally
+        {
+            isLoading = false;
+            StateHasChanged();
+        }
+    }
+
+    private async Task OnPageChanged(int index)
+    {
+        await LoadPage(index);
+    }
+
+    private void SetEditContext(EditContext context)
+    {
+        if (editContext == context)
+        {
+            return;
+        }
+
+        if (editContext != null)
+        {
+            editContext.OnFieldChanged -= OnEditFieldChanged;
+        }
+
+        editContext = context;
+        validationMessageStore = new ValidationMessageStore(editContext);
+        editContext.OnFieldChanged += OnEditFieldChanged;
+    }
+
+    private void OnEditFieldChanged(object? sender, FieldChangedEventArgs e)
+    {
+        if (validationMessageStore == null || editContext == null)
+        {
+            return;
+        }
+
+        if (e.FieldIdentifier.FieldName == nameof(MassDataEditModel.UpdateProcedure))
+        {
+            validationMessageStore.Clear();
+            editContext.NotifyValidationStateChanged();
+            return;
+        }
+
+        if (e.FieldIdentifier.FieldName == nameof(MassDataEditModel.CustomerName))
+        {
+            var field = new FieldIdentifier(editContext.Model, nameof(MassDataEditModel.CustomerName));
+            validationMessageStore.Clear(field);
+            editContext.NotifyValidationStateChanged();
+        }
+    }
+
+    private void SetPopupHeaderText(bool isNew)
+    {
+        popupHeaderText = isNew ? "Neu" : "Edit";
+    }
+
+    private void OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
+    {
+        if (e.IsNew)
+        {
+            e.EditModel = new MassDataEditModel { IsNew = true, UpdateProcedure = procedureOptions[0].Value };
+            SetPopupHeaderText(true);
+            return;
+        }
+
+        var item = (MassDataReadDto)e.DataItem;
+        e.EditModel = new MassDataEditModel
+        {
+            Id = item.Id,
+            CustomerName = item.CustomerName,
+            AmountText = item.Amount.ToString("0.00"),
+            Category = item.Category,
+            StatusFlag = item.StatusFlag,
+            UpdateProcedure = procedureOptions[0].Value,
+            IsNew = false,
+            OriginalCustomerName = item.CustomerName
+        };
+        SetPopupHeaderText(false);
+    }
+
+    private async Task OnEditModelSaving(GridEditModelSavingEventArgs e)
+    {
+        errorMessage = null;
+        infoMessage = null;
+
+        validationMessageStore?.Clear();
+        editContext?.NotifyValidationStateChanged();
+
+        var editModel = (MassDataEditModel)e.EditModel;
+        if (!decimal.TryParse(editModel.AmountText, out var amount))
+        {
+            AddValidationError(editModel, nameof(MassDataEditModel.AmountText), "Amount ist ungültig.");
+            e.Cancel = true;
+            return;
+        }
+
+        if (editModel.IsNew)
+        {
+            var existing = await Api.GetByCustomerNameAsync(editModel.CustomerName);
+            if (existing != null)
+            {
+                AddValidationError(editModel, nameof(MassDataEditModel.CustomerName), "Kunde existiert bereits.");
+                e.Cancel = true;
+                return;
+            }
+        }
+
+        var dto = new MassDataWriteDto
+        {
+            CustomerName = editModel.CustomerName,
+            Amount = amount,
+            Category = editModel.Category,
+            StatusFlag = editModel.StatusFlag
+        };
+
+        try
+        {
+            await Api.UpsertAsync(dto);
+            infoMessage = editModel.IsNew ? "MassData angelegt." : "MassData aktualisiert.";
+            await LoadPage(pageIndex);
+        }
+        catch (Exception ex)
+        {
+            errorMessage = $"Fehler beim Speichern: {ex.Message}";
+            e.Cancel = true;
+        }
+    }
+
+    private void AddValidationError(MassDataEditModel editModel, string fieldName, string message)
+    {
+        if (editContext == null || validationMessageStore == null)
+        {
+            return;
+        }
+
+        var field = new FieldIdentifier(editModel, fieldName);
+        validationMessageStore.Add(field, message);
+        editContext.NotifyValidationStateChanged();
+    }
+
+    private Task OnDataItemDeleting(GridDataItemDeletingEventArgs e)
+    {
+        errorMessage = null;
+        infoMessage = "Löschen ist aktuell noch nicht verfügbar.";
+        e.Cancel = true;
+        return Task.CompletedTask;
+    }
+
+    private sealed class MassDataEditModel
+    {
+        public int Id { get; set; }
+        public string CustomerName { get; set; } = string.Empty;
+        public string AmountText { get; set; } = string.Empty;
+        public string Category { get; set; } = string.Empty;
+        public bool StatusFlag { get; set; }
+        public int UpdateProcedure { get; set; }
+        public bool IsNew { get; set; }
+        public string OriginalCustomerName { get; set; } = string.Empty;
+    }
+
+    private sealed class ProcedureOption
+    {
+        public int Value { get; set; }
+        public string Text { get; set; } = string.Empty;
+    }
+
+    private sealed class BoolFilterOption
+    {
+        public bool? Value { get; set; }
+        public string Text { get; set; } = string.Empty;
+    }
+}

DbFirst.BlazorWasm/DbFirst.BlazorWasm.csproj

@@ -13,6 +13,7 @@
     <PackageReference Include="DevExpress.Blazor.Themes.Fluent" Version="25.2.3" />
     <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="8.0.22" />
     <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="8.0.22" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="8.0.22" />
   </ItemGroup>
 
   <ItemGroup>

DbFirst.BlazorWasm/Layout/NavMenu.razor

@@ -26,6 +26,11 @@
                 <span class="oi oi-list-rich" aria-hidden="true"></span> Dashboards
             </NavLink>
         </div>
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="massdata">
+                <span class="bi bi-table" aria-hidden="true"></span> MassData
+            </NavLink>
+        </div>
     </nav>
 </div>
 

DbFirst.BlazorWasm/Models/MassDataReadDto.cs

@@ -0,0 +1,12 @@
+namespace DbFirst.BlazorWasm.Models;
+
+public class MassDataReadDto
+{
+    public int Id { get; set; }
+    public string CustomerName { get; set; } = string.Empty;
+    public decimal Amount { get; set; }
+    public string Category { get; set; } = string.Empty;
+    public bool StatusFlag { get; set; }
+    public DateTime AddedWhen { get; set; }
+    public DateTime? ChangedWhen { get; set; }
+}

DbFirst.BlazorWasm/Models/MassDataWriteDto.cs

@@ -0,0 +1,9 @@
+namespace DbFirst.BlazorWasm.Models;
+
+public class MassDataWriteDto
+{
+    public string CustomerName { get; set; } = string.Empty;
+    public decimal Amount { get; set; }
+    public string Category { get; set; } = string.Empty;
+    public bool StatusFlag { get; set; }
+}

DbFirst.BlazorWasm/Pages/Dashboard.razor

@@ -1,5 +1,6 @@
 @page "/dashboard"
 @page "/dashboards/{DashboardId?}"
+@implements IAsyncDisposable
 @inject Microsoft.Extensions.Configuration.IConfiguration Configuration
 @inject NavigationManager Navigation
 @inject DashboardApiClient DashboardApi
@@ -57,7 +58,7 @@
         {
             @foreach (var dashboard in dashboards)
             {
-                <NavLink class="dashboard-nav-link" href="@($"dashboards/{dashboard.Id}")">@dashboard.Name</NavLink>
+                <NavLink class="dashboard-nav-link" href="@($"dashboards/{dashboard.Id}?mode={(IsDesigner ? "designer" : "viewer")}")">@dashboard.Name</NavLink>
             }
         }
     </aside>
@@ -77,19 +78,38 @@
     [SupplyParameterFromQuery] public string? Mode { get; set; }
 
     private readonly List<DashboardInfoDto> dashboards = new();
+    private HubConnection? _hubConnection;
 
     private bool IsDesigner => !string.Equals(Mode, "viewer", StringComparison.OrdinalIgnoreCase);
     private WorkingMode CurrentMode => IsDesigner ? WorkingMode.Designer : WorkingMode.ViewerOnly;
-    private string SelectedDashboardId { get; set; } = "";
+    private string SelectedDashboardId { get; set; } = string.Empty;
     private string DashboardKey => $"{SelectedDashboardId}-{(IsDesigner ? "designer" : "viewer")}";
 
     private string DashboardEndpoint => $"{Configuration["ApiBaseUrl"]?.TrimEnd('/')}/api/dashboard";
+    private string HubEndpoint => $"{Configuration["ApiBaseUrl"]?.TrimEnd('/')}/hubs/dashboards";
+
+    protected override async Task OnInitializedAsync()
+    {
+        await RefreshDashboards();
+
+        _hubConnection = new HubConnectionBuilder()
+            .WithUrl(HubEndpoint)
+            .WithAutomaticReconnect()
+            .Build();
+
+        _hubConnection.On("DashboardsChanged", async () =>
+        {
+            await RefreshDashboards();
+        });
+
+        await _hubConnection.StartAsync();
+    }
 
     protected override async Task OnParametersSetAsync()
     {
         if (dashboards.Count == 0)
         {
-            dashboards.AddRange(await DashboardApi.GetAllAsync());
+            await RefreshDashboards();
         }
 
         var requestedId = string.IsNullOrWhiteSpace(DashboardId) || string.Equals(DashboardId, "default", StringComparison.OrdinalIgnoreCase)
@@ -119,4 +139,25 @@
         var targetMode = IsDesigner ? "viewer" : "designer";
         Navigation.NavigateTo($"dashboards/{SelectedDashboardId}?mode={targetMode}", replace: true);
     }
+
+    private async Task RefreshDashboards()
+    {
+        var latest = await DashboardApi.GetAllAsync();
+        if (latest.Count == dashboards.Count && latest.All(d => dashboards.Any(x => x.Id == d.Id && x.Name == d.Name)))
+        {
+            return;
+        }
+
+        dashboards.Clear();
+        dashboards.AddRange(latest);
+        await InvokeAsync(StateHasChanged);
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        if (_hubConnection != null)
+        {
+            await _hubConnection.DisposeAsync();
+        }
+    }
 }

DbFirst.BlazorWasm/Pages/Massdata.razor

@@ -0,0 +1,7 @@
+@page "/massdata"
+
+<PageTitle>MassData</PageTitle>
+
+<h1>MassData</h1>
+
+<MassDataGrid />

DbFirst.BlazorWasm/Program.cs

@@ -18,5 +18,6 @@ var apiBaseUrl = builder.Configuration["ApiBaseUrl"] ?? builder.HostEnvironment.
 builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(apiBaseUrl) });
 builder.Services.AddScoped<CatalogApiClient>();
 builder.Services.AddScoped<DashboardApiClient>();
+builder.Services.AddScoped<MassDataApiClient>();
 
 await builder.Build().RunAsync();

DbFirst.BlazorWasm/Services/MassDataApiClient.cs

@@ -0,0 +1,52 @@
+using System.Net.Http.Json;
+using DbFirst.BlazorWasm.Models;
+
+namespace DbFirst.BlazorWasm.Services;
+
+public class MassDataApiClient
+{
+    private readonly HttpClient _httpClient;
+    private const string Endpoint = "api/massdata";
+
+    public MassDataApiClient(HttpClient httpClient)
+    {
+        _httpClient = httpClient;
+    }
+
+    public async Task<int> GetCountAsync()
+    {
+        var result = await _httpClient.GetFromJsonAsync<int?>("api/massdata/count");
+        return result ?? 0;
+    }
+
+    public async Task<List<MassDataReadDto>> GetAllAsync(int skip, int take)
+    {
+        var result = await _httpClient.GetFromJsonAsync<List<MassDataReadDto>>($"{Endpoint}?skip={skip}&take={take}");
+        return result ?? new List<MassDataReadDto>();
+    }
+
+    public async Task<MassDataReadDto> UpsertAsync(MassDataWriteDto dto)
+    {
+        var response = await _httpClient.PostAsJsonAsync($"{Endpoint}/upsert", dto);
+        response.EnsureSuccessStatusCode();
+        var payload = await response.Content.ReadFromJsonAsync<MassDataReadDto>();
+        return payload ?? new MassDataReadDto();
+    }
+
+    public async Task<MassDataReadDto?> GetByCustomerNameAsync(string customerName)
+    {
+        if (string.IsNullOrWhiteSpace(customerName))
+        {
+            return null;
+        }
+
+        var response = await _httpClient.GetAsync($"{Endpoint}/{Uri.EscapeDataString(customerName)}");
+        if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
+        {
+            return null;
+        }
+
+        response.EnsureSuccessStatusCode();
+        return await response.Content.ReadFromJsonAsync<MassDataReadDto>();
+    }
+}

DbFirst.BlazorWasm/_Imports.razor

@@ -6,6 +6,7 @@
 @using Microsoft.AspNetCore.Components.Web.Virtualization
 @using Microsoft.AspNetCore.Components.WebAssembly.Http
 @using Microsoft.JSInterop
+@using Microsoft.AspNetCore.SignalR.Client
 @using DbFirst.BlazorWasm
 @using DbFirst.BlazorWasm.Layout
 @using DbFirst.BlazorWasm.Models

DbFirst.BlazorWebApp/Components/CatalogsGrid.razor

@@ -1,8 +1,12 @@
+@using Microsoft.AspNetCore.Components.Forms
 @inject CatalogApiClient Api
 
 <style>
     .action-panel { margin-bottom: 16px; }
     .grid-section { margin-top: 12px; }
+    .catalog-edit-popup {
+        min-width: 720px;
+    }
 </style>
 
 @if (!string.IsNullOrWhiteSpace(errorMessage))
@@ -14,41 +18,6 @@ else if (!string.IsNullOrWhiteSpace(infoMessage))
     <div class="alert alert-success" role="alert">@infoMessage</div>
 }
 
-<div class="mb-3">
-    <DxButton RenderStyle="ButtonRenderStyle.Primary" Click="@StartCreate">Neuen Eintrag anlegen</DxButton>
-</div>
-
-@if (showForm)
-{
-    <div class="action-panel">
-        <EditForm Model="formModel" OnValidSubmit="HandleSubmit" Context="editCtx">
-            <DxFormLayout ColCount="2">
-                <DxFormLayoutItem Caption="Titel" Context="itemCtx">
-                    <DxTextBox @bind-Text="formModel.CatTitle" Enabled="@(isEditing ? formModel.UpdateProcedure != 0 : true)" />
-                </DxFormLayoutItem>
-                <DxFormLayoutItem Caption="Kennung" Context="itemCtx">
-                    <DxTextBox @bind-Text="formModel.CatString" />
-                </DxFormLayoutItem>
-                @if (isEditing)
-                {
-                    <DxFormLayoutItem Caption="Update-Prozedur" Context="itemCtx">
-                        <DxComboBox Data="@procedureOptions"
-                                    TextFieldName="Text"
-                                    ValueFieldName="Value"
-                                    @bind-Value="formModel.UpdateProcedure" />
-                    </DxFormLayoutItem>
-                }
-                <DxFormLayoutItem Caption=" " Context="itemCtx">
-                    <DxStack Orientation="Orientation.Horizontal" Spacing="8">
-                        <DxButton RenderStyle="ButtonRenderStyle.Success" ButtonType="ButtonType.Submit" SubmitFormOnClick="true" Context="btnCtx">@((isEditing ? "Speichern" : "Anlegen"))</DxButton>
-                        <DxButton RenderStyle="ButtonRenderStyle.Secondary" Click="@CancelEdit" Context="btnCtx">Abbrechen</DxButton>
-                    </DxStack>
-                </DxFormLayoutItem>
-            </DxFormLayout>
-        </EditForm>
-    </div>
-}
-
 @if (isLoading)
 {
     <p><em>Lade Daten...</em></p>
@@ -60,38 +29,108 @@ else if (items.Count == 0)
 else
 {
     <div class="grid-section">
-        <DxGrid Data="@items" TItem="CatalogReadDto" KeyFieldName="@nameof(CatalogReadDto.Guid)" ShowFilterRow="true" PageSize="10" CssClass="mb-4 catalog-grid">
+        <DxGrid Data="@items"
+                TItem="CatalogReadDto"
+                KeyFieldName="@nameof(CatalogReadDto.Guid)"
+                ShowFilterRow="true"
+                PageSize="10"
+                CssClass="mb-4 catalog-grid"
+                EditMode="GridEditMode.PopupEditForm"
+                PopupEditFormCssClass="catalog-edit-popup"
+                PopupEditFormHeaderText="@popupHeaderText"
+                CustomizeEditModel="OnCustomizeEditModel"
+                EditModelSaving="OnEditModelSaving"
+                DataItemDeleting="OnDataItemDeleting">
             <Columns>
-                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.Guid)" Caption="Id" Width="140px" SortIndex="0" SortOrder="GridColumnSortOrder.Ascending" />
-                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.CatTitle)" Caption="Titel" />
-                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.CatString)" Caption="String" />
-                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.AddedWho)" Caption="Angelegt von" />
-                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.AddedWhen)" Caption="Angelegt am" />
-                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.ChangedWho)" Caption="Geändert von" />
-                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.ChangedWhen)" Caption="Geändert am" />
-                <DxGridDataColumn Caption="" Width="220px" AllowSort="false">
-                    <CellDisplayTemplate Context="cell">
-                        @{ var item = (CatalogReadDto)cell.DataItem; }
-                        <div style="white-space: nowrap;">
-                            <DxButton RenderStyle="ButtonRenderStyle.Secondary" Size="ButtonSize.Small" Click="@(() => StartEdit(item))">Bearbeiten</DxButton>
-                            <DxButton RenderStyle="ButtonRenderStyle.Danger" Size="ButtonSize.Small" Click="@(() => DeleteCatalog(item.Guid))">Löschen</DxButton>
-                        </div>
-                    </CellDisplayTemplate>
+                <DxGridCommandColumn Width="120px" />
+                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.Guid)" Caption="Id" Width="140px" SortIndex="0" SortOrder="GridColumnSortOrder.Ascending">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue?.ToString())"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.CatTitle)" Caption="Titel">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue as string)"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.CatString)" Caption="String">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue as string)"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.AddedWho)" Caption="Angelegt von" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue as string)"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.AddedWhen)" Caption="Angelegt am" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxDateEdit Date="@((DateTime?)filter.FilterRowValue)"
+                                    DateChanged="@((DateTime? value) => { filter.FilterRowValue = value; })"
+                                    Width="100%" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.ChangedWho)" Caption="Geändert von" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue as string)"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(CatalogReadDto.ChangedWhen)" Caption="Geändert am" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxDateEdit Date="@((DateTime?)filter.FilterRowValue)"
+                                    DateChanged="@((DateTime? value) => { filter.FilterRowValue = value; })"
+                                    Width="100%" />
+                    </FilterRowCellTemplate>
                 </DxGridDataColumn>
             </Columns>
+            <EditFormTemplate Context="editFormContext">
+                @{ SetEditContext(editFormContext.EditContext); var editModel = (CatalogEditModel)editFormContext.EditModel; SetPopupHeaderText(editModel.IsNew); }
+                <DxFormLayout ColCount="2">
+                    <DxFormLayoutItem Caption="Titel">
+                        <DxTextBox @bind-Text="editModel.CatTitle" Width="100%" />
+                    </DxFormLayoutItem>
+                    <DxFormLayoutItem Caption="Kennung">
+                        <DxTextBox @bind-Text="editModel.CatString" Width="100%" />
+                    </DxFormLayoutItem>
+                    @if (!editModel.IsNew)
+                    {
+                        <DxFormLayoutItem Caption="Update-Prozedur">
+                            <DxComboBox Data="@procedureOptions"
+                                        TData="ProcedureOption"
+                                        TValue="int"
+                                        TextFieldName="Text"
+                                        ValueFieldName="Value"
+                                        @bind-Value="editModel.UpdateProcedure"
+                                        Width="100%" />
+                        </DxFormLayoutItem>
+                    }
+                    <DxFormLayoutItem ColSpanMd="12">
+                        <ValidationSummary />
+                    </DxFormLayoutItem>
+                </DxFormLayout>
+            </EditFormTemplate>
         </DxGrid>
     </div>
 }
 
 @code {
     private List<CatalogReadDto> items = new();
-    private CatalogWriteDto formModel = new();
-    private int editingId;
     private bool isLoading;
-    private bool isEditing;
-    private bool showForm;
     private string? errorMessage;
     private string? infoMessage;
+    private EditContext? editContext;
+    private ValidationMessageStore? validationMessageStore;
+    private string popupHeaderText = "Edit";
 
     private readonly List<ProcedureOption> procedureOptions = new()
     {
@@ -104,6 +143,71 @@ else
         await LoadCatalogs();
     }
 
+    private void SetEditContext(EditContext context)
+    {
+        if (editContext == context)
+        {
+            return;
+        }
+
+        if (editContext != null)
+        {
+            editContext.OnFieldChanged -= OnEditFieldChanged;
+        }
+
+        editContext = context;
+        validationMessageStore = new ValidationMessageStore(editContext);
+        editContext.OnFieldChanged += OnEditFieldChanged;
+    }
+
+    private void OnEditFieldChanged(object? sender, FieldChangedEventArgs e)
+    {
+        if (validationMessageStore == null || editContext == null)
+        {
+            return;
+        }
+
+        if (e.FieldIdentifier.FieldName == nameof(CatalogEditModel.UpdateProcedure))
+        {
+            validationMessageStore.Clear();
+            editContext.NotifyValidationStateChanged();
+            return;
+        }
+
+        if (e.FieldIdentifier.FieldName == nameof(CatalogEditModel.CatTitle))
+        {
+            var field = new FieldIdentifier(editContext.Model, nameof(CatalogEditModel.CatTitle));
+            validationMessageStore.Clear(field);
+            editContext.NotifyValidationStateChanged();
+        }
+    }
+
+    private void SetPopupHeaderText(bool isNew)
+    {
+        popupHeaderText = isNew ? "Neu" : "Edit";
+    }
+
+    private void OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
+    {
+        popupHeaderText = e.IsNew ? "Neu" : "Edit";
+        if (e.IsNew)
+        {
+            e.EditModel = new CatalogEditModel { IsNew = true };
+            return;
+        }
+
+        var item = (CatalogReadDto)e.DataItem;
+        e.EditModel = new CatalogEditModel
+        {
+            Guid = item.Guid,
+            CatTitle = item.CatTitle,
+            CatString = item.CatString,
+            UpdateProcedure = 0,
+            OriginalCatTitle = item.CatTitle,
+            IsNew = false
+        };
+    }
+
     private async Task LoadCatalogs()
     {
         isLoading = true;
@@ -123,88 +227,115 @@ else
         }
     }
 
-    private void StartCreate()
+    private async Task OnEditModelSaving(GridEditModelSavingEventArgs e)
     {
-        formModel = new CatalogWriteDto();
-        editingId = 0;
-        isEditing = false;
-        showForm = true;
-        infoMessage = null;
         errorMessage = null;
-    }
+        infoMessage = null;
 
-    private void StartEdit(CatalogReadDto item)
-    {
-        formModel = new CatalogWriteDto
+        validationMessageStore?.Clear();
+        editContext?.NotifyValidationStateChanged();
+
+        var editModel = (CatalogEditModel)e.EditModel;
+        if (!ValidateEditModel(editModel, e.IsNew))
         {
-            CatTitle = item.CatTitle,
-            CatString = item.CatString,
-            UpdateProcedure = 0
-        };
-        editingId = item.Guid;
-        isEditing = true;
-        showForm = true;
-        infoMessage = null;
-        errorMessage = null;
-    }
+            e.Cancel = true;
+            return;
+        }
 
-    private async Task HandleSubmit()
-    {
-        errorMessage = null;
-        infoMessage = null;
+        var dto = new CatalogWriteDto
+        {
+            CatTitle = editModel.CatTitle,
+            CatString = editModel.CatString,
+            UpdateProcedure = editModel.UpdateProcedure
+        };
 
         try
         {
-            if (isEditing)
+            if (e.IsNew)
             {
-                var updated = await Api.UpdateAsync(editingId, formModel);
-                if (!updated.Success)
-                {
-                    errorMessage = updated.Error ?? "Aktualisierung fehlgeschlagen.";
-                    return;
-                }
-
-                infoMessage = "Katalog aktualisiert.";
-            }
-            else
-            {
-                var created = await Api.CreateAsync(formModel);
+                var created = await Api.CreateAsync(dto);
                 if (!created.Success || created.Value == null)
                 {
-                    errorMessage = created.Error ?? "Anlegen fehlgeschlagen.";
+                    if (!string.IsNullOrWhiteSpace(created.Error))
+                    {
+                        AddValidationError(editModel, nameof(CatalogEditModel.CatTitle), created.Error);
+                    }
+                    else
+                    {
+                        errorMessage = "Anlegen fehlgeschlagen.";
+                    }
+
+                    e.Cancel = true;
                     return;
                 }
 
                 infoMessage = "Katalog angelegt.";
             }
+            else
+            {
+                var updated = await Api.UpdateAsync(editModel.Guid, dto);
+                if (!updated.Success)
+                {
+                    errorMessage = updated.Error ?? "Aktualisierung fehlgeschlagen.";
+                    e.Cancel = true;
+                    return;
+                }
+
+                infoMessage = "Katalog aktualisiert.";
+            }
 
-            showForm = false;
             await LoadCatalogs();
         }
         catch (Exception ex)
         {
             errorMessage = $"Fehler beim Speichern: {ex.Message}";
+            e.Cancel = true;
         }
     }
 
-    private void CancelEdit()
+    private void AddValidationError(CatalogEditModel editModel, string fieldName, string message)
     {
-        showForm = false;
-        infoMessage = null;
-        errorMessage = null;
+        if (editContext == null || validationMessageStore == null)
+        {
+            return;
+        }
+
+        var field = new FieldIdentifier(editModel, fieldName);
+        validationMessageStore.Add(field, message);
+        editContext.NotifyValidationStateChanged();
     }
 
-    private async Task DeleteCatalog(int id)
+    private bool ValidateEditModel(CatalogEditModel editModel, bool isNew)
+    {
+        if (isNew)
+        {
+            return true;
+        }
+
+        if (editModel.UpdateProcedure == 0 &&
+            !string.Equals(editModel.CatTitle, editModel.OriginalCatTitle, StringComparison.OrdinalIgnoreCase))
+        {
+            AddValidationError(editModel, nameof(CatalogEditModel.CatTitle), "Titel kann nicht geändert werden.");
+            return false;
+        }
+
+        return true;
+    }
+
+    private async Task OnDataItemDeleting(GridDataItemDeletingEventArgs e)
     {
         errorMessage = null;
         infoMessage = null;
 
+        var item = (CatalogReadDto)e.DataItem;
+
         try
         {
-            var deleted = await Api.DeleteAsync(id);
+            var deleted = await Api.DeleteAsync(item.Guid);
             if (!deleted.Success)
             {
                 errorMessage = deleted.Error ?? "Löschen fehlgeschlagen.";
+                e.Cancel = true;
                 return;
             }
 
@@ -214,9 +345,20 @@ else
         catch (Exception ex)
         {
             errorMessage = $"Fehler beim Löschen: {ex.Message}";
+            e.Cancel = true;
         }
     }
 
+    private sealed class CatalogEditModel
+    {
+        public int Guid { get; set; }
+        public string CatTitle { get; set; } = string.Empty;
+        public string CatString { get; set; } = string.Empty;
+        public int UpdateProcedure { get; set; }
+        public string OriginalCatTitle { get; set; } = string.Empty;
+        public bool IsNew { get; set; }
+    }
+
     private sealed class ProcedureOption
     {
         public int Value { get; set; }

DbFirst.BlazorWebApp/Components/Layout/NavMenu.razor

@@ -36,6 +36,12 @@
                 <span class="oi oi-list-rich" aria-hidden="true"></span> Dashboards
             </NavLink>
         </div>
+
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="massdata">
+                <span class="bi bi-table" aria-hidden="true"></span> MassData
+            </NavLink>
+        </div>
     </nav>
 </div>
 

DbFirst.BlazorWebApp/Components/MassDataGrid.razor

@@ -0,0 +1,408 @@
+@using Microsoft.AspNetCore.Components.Forms
+@inject MassDataApiClient Api
+
+<style>
+    .action-panel { margin-bottom: 16px; }
+    .grid-section { margin-top: 12px; }
+    .pager-container {
+        display: flex;
+        justify-content: center;
+        margin-top: 12px;
+        margin-bottom: 16px;
+    }
+    .massdata-grid .dxbl-grid-sort-asc,
+    .massdata-grid .dxbl-grid-sort-desc {
+        display: none;
+    }
+    .massdata-grid th.dxbl-grid-header-sortable {
+        position: relative;
+        padding-right: 1.5rem;
+    }
+    .massdata-grid th.dxbl-grid-header-sortable::before,
+    .massdata-grid th.dxbl-grid-header-sortable::after {
+        content: "";
+        position: absolute;
+        right: 0.45rem;
+        width: 0.7rem;
+        height: 0.7rem;
+        background-repeat: no-repeat;
+        background-size: 0.7rem 0.7rem;
+        opacity: 0.35;
+        pointer-events: none;
+    }
+    .massdata-grid th.dxbl-grid-header-sortable::before {
+        top: 38%;
+        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.957 10.999a1 1 0 0 1-.821-1.571l2.633-3.785a1.5 1.5 0 0 1 2.462 0l2.633 3.785a1 1 0 0 1-.821 1.57H4.957Z' fill='%23888888'/%3E%3C/svg%3E");
+    }
+    .massdata-grid th.dxbl-grid-header-sortable::after {
+        top: 58%;
+        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.957 5a1 1 0 0 0-.821 1.571l2.633 3.784a1.5 1.5 0 0 0 2.462 0l2.633-3.784A1 1 0 0 0 11.043 5H4.957Z' fill='%23888888'/%3E%3C/svg%3E");
+    }
+    .massdata-grid th.dxbl-grid-header-sortable[aria-sort="ascending"]::after {
+        opacity: 0;
+    }
+    .massdata-grid th.dxbl-grid-header-sortable[aria-sort="descending"]::before {
+        opacity: 0;
+    }
+    .massdata-grid .filter-search-input input {
+        padding-right: 1.75rem;
+        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M9.309 10.016a4.5 4.5 0 1 1 .707-.707l3.838 3.837a.5.5 0 0 1-.708.708L9.31 10.016ZM10 6.5a3.5 3.5 0 1 0-7 0 3.5 3.5 0 0 0 7 0Z' fill='%23666666'/%3E%3C/svg%3E");
+        background-repeat: no-repeat;
+        background-position: right 0.5rem center;
+        background-size: 0.9rem;
+    }
+    .massdata-edit-popup {
+        min-width: 720px;
+    }
+</style>
+
+@if (!string.IsNullOrWhiteSpace(errorMessage))
+{
+    <div class="alert alert-danger" role="alert">@errorMessage</div>
+}
+else if (!string.IsNullOrWhiteSpace(infoMessage))
+{
+    <div class="alert alert-success" role="alert">@infoMessage</div>
+}
+
+@if (isLoading)
+{
+    <p><em>Lade Daten...</em></p>
+}
+else if (items.Count == 0)
+{
+    <p>Keine Einträge vorhanden.</p>
+}
+else
+{
+    <div class="grid-section">
+        <DxGrid Data="@items"
+                TItem="MassDataReadDto"
+                KeyFieldName="@nameof(MassDataReadDto.Id)"
+                ShowFilterRow="true"
+                ShowGroupPanel="true"
+                AllowColumnResize="true"
+                PagerVisible="false"
+                PageSize="100"
+                CssClass="mb-3 massdata-grid"
+                EditMode="GridEditMode.PopupEditForm"
+                PopupEditFormCssClass="massdata-edit-popup"
+                PopupEditFormHeaderText="@popupHeaderText"
+                CustomizeEditModel="OnCustomizeEditModel"
+                EditModelSaving="OnEditModelSaving"
+                DataItemDeleting="OnDataItemDeleting">
+            <Columns>
+                <DxGridCommandColumn Width="120px" />
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.Id)" Caption="Id" Width="90px" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue?.ToString())"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.CustomerName)" Caption="CustomerName">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue as string)"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.Amount)" Caption="Amount" DisplayFormat="c2">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue?.ToString())"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.Category)" Caption="Category" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxTextBox Text="@(filter.FilterRowValue as string)"
+                                   TextChanged="@(value => filter.FilterRowValue = value)"
+                                   CssClass="filter-search-input" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.StatusFlag)" Caption="Status" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxComboBox Data="@statusFilterOptions"
+                                    TData="BoolFilterOption"
+                                    TValue="bool?"
+                                    TextFieldName="Text"
+                                    ValueFieldName="Value"
+                                    Value="@(filter.FilterRowValue as bool?)"
+                                    ValueChanged="@(value => filter.FilterRowValue = value)"
+                                    Width="100%" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.AddedWhen)" Caption="Added" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxDateEdit Date="@((DateTime?)filter.FilterRowValue)"
+                                    DateChanged="@((DateTime? value) => { filter.FilterRowValue = value; })"
+                                    Width="100%" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+                <DxGridDataColumn FieldName="@nameof(MassDataReadDto.ChangedWhen)" Caption="Changed" ReadOnly="true">
+                    <FilterRowCellTemplate Context="filter">
+                        <DxDateEdit Date="@((DateTime?)filter.FilterRowValue)"
+                                    DateChanged="@((DateTime? value) => { filter.FilterRowValue = value; })"
+                                    Width="100%" />
+                    </FilterRowCellTemplate>
+                </DxGridDataColumn>
+            </Columns>
+            <EditFormTemplate Context="editFormContext">
+                @{ SetEditContext(editFormContext.EditContext); var editModel = (MassDataEditModel)editFormContext.EditModel; SetPopupHeaderText(editModel.IsNew); }
+                <DxFormLayout ColCount="2">
+                    <DxFormLayoutItem Caption="CustomerName">
+                        <DxTextBox @bind-Text="editModel.CustomerName" Width="100%" />
+                    </DxFormLayoutItem>
+                    <DxFormLayoutItem Caption="Amount">
+                        <DxTextBox @bind-Text="editModel.AmountText" Width="100%" />
+                    </DxFormLayoutItem>
+                    <DxFormLayoutItem Caption="Category">
+                        <DxTextBox @bind-Text="editModel.Category" Width="100%" ReadOnly="@(!editModel.IsNew)" />
+                    </DxFormLayoutItem>
+                    <DxFormLayoutItem Caption="Status">
+                        <DxCheckBox @bind-Checked="editModel.StatusFlag" ReadOnly="@(!editModel.IsNew)" />
+                    </DxFormLayoutItem>
+                    @if (!editModel.IsNew)
+                    {
+                        <DxFormLayoutItem Caption="Prozedur">
+                            <DxComboBox Data="@procedureOptions"
+                                        TData="ProcedureOption"
+                                        TValue="int"
+                                        TextFieldName="Text"
+                                        ValueFieldName="Value"
+                                        @bind-Value="editModel.UpdateProcedure"
+                                        Width="100%" />
+                        </DxFormLayoutItem>
+                    }
+                    <DxFormLayoutItem ColSpanMd="12">
+                        <ValidationSummary />
+                    </DxFormLayoutItem>
+                </DxFormLayout>
+            </EditFormTemplate>
+        </DxGrid>
+
+        <div class="pager-container">
+            <DxPager PageCount="@pageCount" ActivePageIndex="@pageIndex" ActivePageIndexChanged="OnPageChanged" />
+        </div>
+    </div>
+}
+
+@code {
+    private const int PageSize = 100;
+    private List<MassDataReadDto> items = new();
+    private bool isLoading;
+    private string? errorMessage;
+    private string? infoMessage;
+    private int pageIndex;
+    private int pageCount = 1;
+    private string popupHeaderText = "Edit";
+    private EditContext? editContext;
+    private ValidationMessageStore? validationMessageStore;
+
+    private readonly List<BoolFilterOption> statusFilterOptions = new()
+    {
+        new() { Value = null, Text = "Alle" },
+        new() { Value = true, Text = "True" },
+        new() { Value = false, Text = "False" }
+    };
+
+    private readonly List<ProcedureOption> procedureOptions = new()
+    {
+        new() { Value = 0, Text = "PRMassdata_UpsertByCustomerName" }
+    };
+
+    protected override async Task OnInitializedAsync()
+    {
+        await LoadPage(0);
+    }
+
+    private async Task LoadPage(int page)
+    {
+        isLoading = true;
+        errorMessage = null;
+        try
+        {
+            var total = await Api.GetCountAsync();
+            pageCount = Math.Max(1, (int)Math.Ceiling(total / (double)PageSize));
+            pageIndex = Math.Clamp(page, 0, pageCount - 1);
+
+            var skip = pageIndex * PageSize;
+            items = await Api.GetAllAsync(skip, PageSize);
+        }
+        catch (Exception ex)
+        {
+            errorMessage = $"MassData konnten nicht geladen werden: {ex.Message}";
+        }
+        finally
+        {
+            isLoading = false;
+            StateHasChanged();
+        }
+    }
+
+    private async Task OnPageChanged(int index)
+    {
+        await LoadPage(index);
+    }
+
+    private void SetEditContext(EditContext context)
+    {
+        if (editContext == context)
+        {
+            return;
+        }
+
+        if (editContext != null)
+        {
+            editContext.OnFieldChanged -= OnEditFieldChanged;
+        }
+
+        editContext = context;
+        validationMessageStore = new ValidationMessageStore(editContext);
+        editContext.OnFieldChanged += OnEditFieldChanged;
+    }
+
+    private void OnEditFieldChanged(object? sender, FieldChangedEventArgs e)
+    {
+        if (validationMessageStore == null || editContext == null)
+        {
+            return;
+        }
+
+        if (e.FieldIdentifier.FieldName == nameof(MassDataEditModel.UpdateProcedure))
+        {
+            validationMessageStore.Clear();
+            editContext.NotifyValidationStateChanged();
+            return;
+        }
+
+        if (e.FieldIdentifier.FieldName == nameof(MassDataEditModel.CustomerName))
+        {
+            var field = new FieldIdentifier(editContext.Model, nameof(MassDataEditModel.CustomerName));
+            validationMessageStore.Clear(field);
+            editContext.NotifyValidationStateChanged();
+        }
+    }
+
+    private void SetPopupHeaderText(bool isNew)
+    {
+        popupHeaderText = isNew ? "Neu" : "Edit";
+    }
+
+    private void OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
+    {
+        if (e.IsNew)
+        {
+            e.EditModel = new MassDataEditModel { IsNew = true, UpdateProcedure = procedureOptions[0].Value };
+            SetPopupHeaderText(true);
+            return;
+        }
+
+        var item = (MassDataReadDto)e.DataItem;
+        e.EditModel = new MassDataEditModel
+        {
+            Id = item.Id,
+            CustomerName = item.CustomerName,
+            AmountText = item.Amount.ToString("0.00"),
+            Category = item.Category,
+            StatusFlag = item.StatusFlag,
+            UpdateProcedure = procedureOptions[0].Value,
+            IsNew = false,
+            OriginalCustomerName = item.CustomerName
+        };
+        SetPopupHeaderText(false);
+    }
+
+    private async Task OnEditModelSaving(GridEditModelSavingEventArgs e)
+    {
+        errorMessage = null;
+        infoMessage = null;
+
+        validationMessageStore?.Clear();
+        editContext?.NotifyValidationStateChanged();
+
+        var editModel = (MassDataEditModel)e.EditModel;
+        if (!decimal.TryParse(editModel.AmountText, out var amount))
+        {
+            AddValidationError(editModel, nameof(MassDataEditModel.AmountText), "Amount ist ungültig.");
+            e.Cancel = true;
+            return;
+        }
+
+        if (editModel.IsNew)
+        {
+            var existing = await Api.GetByCustomerNameAsync(editModel.CustomerName);
+            if (existing != null)
+            {
+                AddValidationError(editModel, nameof(MassDataEditModel.CustomerName), "Kunde existiert bereits.");
+                e.Cancel = true;
+                return;
+            }
+        }
+
+        var dto = new MassDataWriteDto
+        {
+            CustomerName = editModel.CustomerName,
+            Amount = amount,
+            Category = editModel.Category,
+            StatusFlag = editModel.StatusFlag
+        };
+
+        try
+        {
+            await Api.UpsertAsync(dto);
+            infoMessage = editModel.IsNew ? "MassData angelegt." : "MassData aktualisiert.";
+            await LoadPage(pageIndex);
+        }
+        catch (Exception ex)
+        {
+            errorMessage = $"Fehler beim Speichern: {ex.Message}";
+            e.Cancel = true;
+        }
+    }
+
+    private void AddValidationError(MassDataEditModel editModel, string fieldName, string message)
+    {
+        if (editContext == null || validationMessageStore == null)
+        {
+            return;
+        }
+
+        var field = new FieldIdentifier(editModel, fieldName);
+        validationMessageStore.Add(field, message);
+        editContext.NotifyValidationStateChanged();
+    }
+
+    private Task OnDataItemDeleting(GridDataItemDeletingEventArgs e)
+    {
+        errorMessage = null;
+        infoMessage = "Löschen ist aktuell noch nicht verfügbar.";
+        e.Cancel = true;
+        return Task.CompletedTask;
+    }
+
+    private sealed class MassDataEditModel
+    {
+        public int Id { get; set; }
+        public string CustomerName { get; set; } = string.Empty;
+        public string AmountText { get; set; } = string.Empty;
+        public string Category { get; set; } = string.Empty;
+        public bool StatusFlag { get; set; }
+        public int UpdateProcedure { get; set; }
+        public bool IsNew { get; set; }
+        public string OriginalCustomerName { get; set; } = string.Empty;
+    }
+
+    private sealed class ProcedureOption
+    {
+        public int Value { get; set; }
+        public string Text { get; set; } = string.Empty;
+    }
+
+    private sealed class BoolFilterOption
+    {
+        public bool? Value { get; set; }
+        public string Text { get; set; } = string.Empty;
+    }
+}

DbFirst.BlazorWebApp/Components/Pages/Dashboard.razor

@@ -1,5 +1,6 @@
 @page "/dashboard"
 @page "/dashboards/{DashboardId?}"
+@implements IAsyncDisposable
 @inject Microsoft.Extensions.Configuration.IConfiguration Configuration
 @inject NavigationManager Navigation
 @inject DashboardApiClient DashboardApi
@@ -57,7 +58,7 @@
         {
             @foreach (var dashboard in dashboards)
             {
-                <NavLink class="dashboard-nav-link" href="@($"dashboards/{dashboard.Id}")">@dashboard.Name</NavLink>
+                <NavLink class="dashboard-nav-link" href="@($"dashboards/{dashboard.Id}?mode={(IsDesigner ? "designer" : "viewer")}")">@dashboard.Name</NavLink>
             }
         }
     </aside>
@@ -77,19 +78,38 @@
     [SupplyParameterFromQuery] public string? Mode { get; set; }
 
     private readonly List<DashboardInfoDto> dashboards = new();
+    private HubConnection? _hubConnection;
 
     private bool IsDesigner => !string.Equals(Mode, "viewer", StringComparison.OrdinalIgnoreCase);
     private WorkingMode CurrentMode => IsDesigner ? WorkingMode.Designer : WorkingMode.ViewerOnly;
-    private string SelectedDashboardId { get; set; } = "";
+    private string SelectedDashboardId { get; set; } = string.Empty;
     private string DashboardKey => $"{SelectedDashboardId}-{(IsDesigner ? "designer" : "viewer")}";
 
     private string DashboardEndpoint => $"{Configuration["ApiBaseUrl"]?.TrimEnd('/')}/api/dashboard";
+    private string HubEndpoint => $"{Configuration["ApiBaseUrl"]?.TrimEnd('/')}/hubs/dashboards";
+
+    protected override async Task OnInitializedAsync()
+    {
+        await RefreshDashboards();
+
+        _hubConnection = new HubConnectionBuilder()
+            .WithUrl(HubEndpoint)
+            .WithAutomaticReconnect()
+            .Build();
+
+        _hubConnection.On("DashboardsChanged", async () =>
+        {
+            await RefreshDashboards();
+        });
+
+        await _hubConnection.StartAsync();
+    }
 
     protected override async Task OnParametersSetAsync()
     {
         if (dashboards.Count == 0)
         {
-            dashboards.AddRange(await DashboardApi.GetAllAsync());
+            await RefreshDashboards();
         }
 
         var requestedId = string.IsNullOrWhiteSpace(DashboardId) || string.Equals(DashboardId, "default", StringComparison.OrdinalIgnoreCase)
@@ -119,4 +139,25 @@
         var targetMode = IsDesigner ? "viewer" : "designer";
         Navigation.NavigateTo($"dashboards/{SelectedDashboardId}?mode={targetMode}", replace: true);
     }
+
+    private async Task RefreshDashboards()
+    {
+        var latest = await DashboardApi.GetAllAsync();
+        if (latest.Count == dashboards.Count && latest.All(d => dashboards.Any(x => x.Id == d.Id && x.Name == d.Name)))
+        {
+            return;
+        }
+
+        dashboards.Clear();
+        dashboards.AddRange(latest);
+        await InvokeAsync(StateHasChanged);
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        if (_hubConnection != null)
+        {
+            await _hubConnection.DisposeAsync();
+        }
+    }
 }

DbFirst.BlazorWebApp/Components/Pages/Massdata.razor

@@ -0,0 +1,7 @@
+@page "/massdata"
+
+<PageTitle>MassData</PageTitle>
+
+<h1>MassData</h1>
+
+<MassDataGrid />

DbFirst.BlazorWebApp/Components/_Imports.razor

@@ -6,6 +6,7 @@
 @using static Microsoft.AspNetCore.Components.Web.RenderMode
 @using Microsoft.AspNetCore.Components.Web.Virtualization
 @using Microsoft.JSInterop
+@using Microsoft.AspNetCore.SignalR.Client
 @using DbFirst.BlazorWebApp
 @using DbFirst.BlazorWebApp.Components
 @using DbFirst.BlazorWebApp.Models

DbFirst.BlazorWebApp/DbFirst.BlazorWebApp.csproj

@@ -12,5 +12,9 @@
     <PackageReference Include="DevExpress.Blazor.Themes" Version="25.2.3" />
     <PackageReference Include="DevExpress.Blazor.Themes.Fluent" Version="25.2.3" />
   </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="DevExpress.Blazor" Version="25.2.3" />
+    <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="8.0.22" />
+  </ItemGroup>
 
 </Project>

DbFirst.BlazorWebApp/Models/MassDataReadDto.cs

@@ -0,0 +1,12 @@
+namespace DbFirst.BlazorWebApp.Models;
+
+public class MassDataReadDto
+{
+    public int Id { get; set; }
+    public string CustomerName { get; set; } = string.Empty;
+    public decimal Amount { get; set; }
+    public string Category { get; set; } = string.Empty;
+    public bool StatusFlag { get; set; }
+    public DateTime AddedWhen { get; set; }
+    public DateTime? ChangedWhen { get; set; }
+}

DbFirst.BlazorWebApp/Models/MassDataWriteDto.cs

@@ -0,0 +1,9 @@
+namespace DbFirst.BlazorWebApp.Models;
+
+public class MassDataWriteDto
+{
+    public string CustomerName { get; set; } = string.Empty;
+    public decimal Amount { get; set; }
+    public string Category { get; set; } = string.Empty;
+    public bool StatusFlag { get; set; }
+}

DbFirst.BlazorWebApp/Program.cs

@@ -21,11 +21,16 @@ if (!string.IsNullOrWhiteSpace(apiBaseUrl))
     {
         client.BaseAddress = new Uri(apiBaseUrl);
     });
+    builder.Services.AddHttpClient<MassDataApiClient>(client =>
+    {
+        client.BaseAddress = new Uri(apiBaseUrl);
+    });
 }
 else
 {
     builder.Services.AddHttpClient<CatalogApiClient>();
     builder.Services.AddHttpClient<DashboardApiClient>();
+    builder.Services.AddHttpClient<MassDataApiClient>();
 }
 
 var app = builder.Build();

DbFirst.BlazorWebApp/Services/MassDataApiClient.cs

@@ -0,0 +1,52 @@
+using System.Net.Http.Json;
+using DbFirst.BlazorWebApp.Models;
+
+namespace DbFirst.BlazorWebApp.Services;
+
+public class MassDataApiClient
+{
+    private readonly HttpClient _httpClient;
+    private const string Endpoint = "api/massdata";
+
+    public MassDataApiClient(HttpClient httpClient)
+    {
+        _httpClient = httpClient;
+    }
+
+    public async Task<int> GetCountAsync()
+    {
+        var result = await _httpClient.GetFromJsonAsync<int?>("api/massdata/count");
+        return result ?? 0;
+    }
+
+    public async Task<List<MassDataReadDto>> GetAllAsync(int skip, int take)
+    {
+        var result = await _httpClient.GetFromJsonAsync<List<MassDataReadDto>>($"{Endpoint}?skip={skip}&take={take}");
+        return result ?? new List<MassDataReadDto>();
+    }
+
+    public async Task<MassDataReadDto> UpsertAsync(MassDataWriteDto dto)
+    {
+        var response = await _httpClient.PostAsJsonAsync($"{Endpoint}/upsert", dto);
+        response.EnsureSuccessStatusCode();
+        var payload = await response.Content.ReadFromJsonAsync<MassDataReadDto>();
+        return payload ?? new MassDataReadDto();
+    }
+
+    public async Task<MassDataReadDto?> GetByCustomerNameAsync(string customerName)
+    {
+        if (string.IsNullOrWhiteSpace(customerName))
+        {
+            return null;
+        }
+
+        var response = await _httpClient.GetAsync($"{Endpoint}/{Uri.EscapeDataString(customerName)}");
+        if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
+        {
+            return null;
+        }
+
+        response.EnsureSuccessStatusCode();
+        return await response.Content.ReadFromJsonAsync<MassDataReadDto>();
+    }
+}

DbFirst.Domain/Entities/Massdata.cs

@@ -0,0 +1,12 @@
+namespace DbFirst.Domain.Entities;
+
+public class Massdata
+{
+    public int Id { get; set; }
+    public string CustomerName { get; set; } = string.Empty;
+    public decimal Amount { get; set; }
+    public string Category { get; set; } = string.Empty;
+    public bool StatusFlag { get; set; }
+    public DateTime AddedWhen { get; set; }
+    public DateTime? ChangedWhen { get; set; }
+}

DbFirst.Infrastructure/DependencyInjection.cs

@@ -11,6 +11,10 @@ public static class DependencyInjection
         services.Configure<TableConfigurations>(configuration.GetSection("TableConfigurations"));
         services.AddDbContext<ApplicationDbContext>(options =>
             options.UseSqlServer(configuration.GetConnectionString("DefaultConnection")));
+
+        services.AddDbContext<MassDataDbContext>(options =>
+            options.UseSqlServer(configuration.GetConnectionString("MassDataConnection")));
+
         return services;
     }
 }

DbFirst.Infrastructure/MassDataDbContext.cs

@@ -0,0 +1,44 @@
+using DbFirst.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+
+namespace DbFirst.Infrastructure;
+
+public class MassDataDbContext : DbContext
+{
+    public MassDataDbContext(DbContextOptions<MassDataDbContext> options)
+        : base(options)
+    {
+    }
+
+    public virtual DbSet<Massdata> Massdata { get; set; }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Massdata>(entity =>
+        {
+            entity.HasKey(e => e.Id);
+            entity.ToTable("MASSDATA");
+
+            entity.Property(e => e.Id).HasColumnName("ID");
+            entity.Property(e => e.CustomerName)
+                .HasMaxLength(200)
+                .IsUnicode(false)
+                .HasColumnName("CustomerName");
+            entity.Property(e => e.Amount)
+                .HasColumnType("decimal(12,2)")
+                .HasColumnName("Amount");
+            entity.Property(e => e.Category)
+                .HasMaxLength(100)
+                .IsUnicode(false)
+                .HasColumnName("Category");
+            entity.Property(e => e.StatusFlag)
+                .HasColumnName("StatusFlag");
+            entity.Property(e => e.AddedWhen)
+                .HasColumnType("datetime")
+                .HasColumnName("ADDED_WHEN");
+            entity.Property(e => e.ChangedWhen)
+                .HasColumnType("datetime")
+                .HasColumnName("CHANGED_WHEN");
+        });
+    }
+}

DbFirst.Infrastructure/Repositories/MassDataRepository.cs

@@ -0,0 +1,71 @@
+using System.Data;
+using DbFirst.Application.Repositories;
+using DbFirst.Domain.Entities;
+using Microsoft.Data.SqlClient;
+using Microsoft.EntityFrameworkCore;
+
+namespace DbFirst.Infrastructure.Repositories;
+
+public class MassDataRepository : IMassDataRepository
+{
+    private readonly MassDataDbContext _db;
+
+    public MassDataRepository(MassDataDbContext db)
+    {
+        _db = db;
+    }
+
+    public async Task<int> GetCountAsync(CancellationToken cancellationToken = default)
+    {
+        return await _db.Massdata.AsNoTracking().CountAsync(cancellationToken);
+    }
+
+    public async Task<List<Massdata>> GetAllAsync(CancellationToken cancellationToken = default)
+    {
+        return await _db.Massdata.AsNoTracking().ToListAsync(cancellationToken);
+    }
+
+    public async Task<Massdata?> GetByCustomerNameAsync(string customerName, CancellationToken cancellationToken = default)
+    {
+        return await _db.Massdata.AsNoTracking()
+            .FirstOrDefaultAsync(x => x.CustomerName == customerName, cancellationToken);
+    }
+
+    public async Task<List<Massdata>> GetAllAsync(int? skip = null, int? take = null, CancellationToken cancellationToken = default)
+    {
+        var query = _db.Massdata.AsNoTracking().OrderBy(x => x.Id).AsQueryable();
+
+        if (skip.HasValue)
+        {
+            query = query.Skip(skip.Value);
+        }
+
+        if (take.HasValue)
+        {
+            query = query.Take(take.Value);
+        }
+
+        return await query.ToListAsync(cancellationToken);
+    }
+
+    public async Task<Massdata> UpsertByCustomerNameAsync(string customerName, decimal amount, bool statusFlag, string category, CancellationToken cancellationToken = default)
+    {
+        var customerParam = new SqlParameter("@CustomerName", SqlDbType.VarChar, 200) { Value = customerName };
+        var amountParam = new SqlParameter("@Amount", SqlDbType.Decimal) { Value = amount, Precision = 12, Scale = 2 };
+        var statusParam = new SqlParameter("@StatusFlag", SqlDbType.Bit) { Value = statusFlag };
+        var categoryParam = new SqlParameter("@Category", SqlDbType.VarChar, 100) { Value = category };
+
+        await _db.Database.ExecuteSqlRawAsync(
+            "EXEC dbo.PRMassdata_UpsertByCustomerName @CustomerName, @Amount, @StatusFlag, @Category",
+            parameters: new[] { customerParam, amountParam, statusParam, categoryParam },
+            cancellationToken: cancellationToken);
+
+        var updated = await GetByCustomerNameAsync(customerName, cancellationToken);
+        if (updated == null)
+        {
+            throw new InvalidOperationException("Upsert completed but record could not be loaded.");
+        }
+
+        return updated;
+    }
+}