diff --git a/DbFirst.BlazorWasm/Components/CatalogsGrid.razor b/DbFirst.BlazorWasm/Components/CatalogsGrid.razor
index 57f741e..31fb68c 100644
--- a/DbFirst.BlazorWasm/Components/CatalogsGrid.razor
+++ b/DbFirst.BlazorWasm/Components/CatalogsGrid.razor
@@ -3,6 +3,7 @@
 @using Microsoft.AspNetCore.Components.Rendering
 @using Microsoft.AspNetCore.Components.Forms
 @using DevExpress.Blazor
+@using DevExpress.Data.Filtering
 @inject CatalogApiClient Api
 @inject LayoutApiClient LayoutApi
 @inject IJSRuntime JsRuntime
@@ -73,6 +74,21 @@
     .band-columns {
         max-width: 720px;
     }
+    .filter-row-cell {
+        display: flex;
+        align-items: center;
+        gap: 4px;
+        flex-wrap: wrap;
+    }
+    .filter-operator {
+        width: 52px;
+        min-width: 52px;
+        flex: 0 0 52px;
+    }
+    .filter-value {
+        min-width: 140px;
+        flex: 1 1 140px;
+    }
 </style>
 
 @if (!string.IsNullOrWhiteSpace(errorMessage))
@@ -186,6 +202,10 @@ else
     private ValidationMessageStore? validationMessageStore;
     private IGrid? gridRef;
     private string popupHeaderText = "Edit";
+    private DateTime? addedWhenFilterValue;
+    private string addedWhenFilterOperator = "=";
+    private DateTime? changedWhenFilterValue;
+    private string changedWhenFilterOperator = "=";
     private const string LayoutType = "GRID_BANDS";
     private const string LayoutKey = "CatalogsGrid";
     private const string LayoutUserStorageKey = "layoutUser";
@@ -212,8 +232,16 @@ else
         new() { Value = 1, Text = "PRTBMY_CATALOG_SAVE" }
     };
 
-    private bool CanSaveBandLayout => !string.IsNullOrWhiteSpace(layoutUser);
+    private readonly List<FilterOperatorOption> filterOperators = new()
+    {
+        new() { Value = "=", Text = "=" },
+        new() { Value = "<", Text = "<" },
+        new() { Value = ">", Text = ">" },
+        new() { Value = "<=", Text = "<=" },
+        new() { Value = ">=", Text = ">=" }
+    };
 
+    private bool CanSaveBandLayout => !string.IsNullOrWhiteSpace(layoutUser);
     private bool gridLayoutApplied;
 
     protected override async Task OnInitializedAsync()
@@ -554,49 +582,6 @@ else
         columnLookup = columnDefinitions.ToDictionary(column => column.FieldName, StringComparer.OrdinalIgnoreCase);
     }
 
-    private void ApplyBandOrderingFromColumnOrder()
-    {
-        if (bandLayout.ColumnOrder.Count == 0)
-        {
-            return;
-        }
-
-        var bandById = bandLayout.Bands.ToDictionary(band => band.Id, StringComparer.OrdinalIgnoreCase);
-        var orderedBandIds = new List<string>();
-        var orderedColumnsByBand = bandLayout.Bands.ToDictionary(
-            band => band.Id,
-            _ => new List<string>(),
-            StringComparer.OrdinalIgnoreCase);
-
-        foreach (var field in bandLayout.ColumnOrder)
-        {
-            if (columnBandAssignments.TryGetValue(field, out var bandId) && bandById.ContainsKey(bandId))
-            {
-                if (!orderedBandIds.Contains(bandId, StringComparer.OrdinalIgnoreCase))
-                {
-                    orderedBandIds.Add(bandId);
-                }
-
-                orderedColumnsByBand[bandId].Add(field);
-            }
-        }
-
-        foreach (var band in bandLayout.Bands)
-        {
-            var orderedColumns = orderedColumnsByBand[band.Id];
-            orderedColumns.AddRange(band.Columns.Where(column => !orderedColumns.Contains(column, StringComparer.OrdinalIgnoreCase)));
-            band.Columns = orderedColumns;
-        }
-
-        if (orderedBandIds.Count > 0)
-        {
-            bandLayout.Bands = orderedBandIds
-                .Select(id => bandById[id])
-                .Concat(bandLayout.Bands.Where(band => !orderedBandIds.Contains(band.Id, StringComparer.OrdinalIgnoreCase)))
-                .ToList();
-        }
-    }
-
     private void AddBand()
     {
         bandLayout.Bands.Add(new BandDefinition
@@ -760,22 +745,95 @@ else
             builder.AddAttribute(seq++, "ReadOnly", true);
         }
 
+        if (string.Equals(column.FieldName, nameof(CatalogReadDto.AddedWhen), StringComparison.OrdinalIgnoreCase))
+        {
+            builder.AddAttribute(seq++, "FilterRowCellTemplate", BuildAddedWhenFilterTemplate());
+        }
+        else if (string.Equals(column.FieldName, nameof(CatalogReadDto.ChangedWhen), StringComparison.OrdinalIgnoreCase))
+        {
+            builder.AddAttribute(seq++, "FilterRowCellTemplate", BuildChangedWhenFilterTemplate());
+        }
+
         builder.CloseComponent();
     }
 
-    private RenderFragment? BuildFilterTemplate(ColumnDefinition column)
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildAddedWhenFilterTemplate()
     {
-        return null;
+        return BuildDateFilterTemplate(
+            () => addedWhenFilterValue,
+            value => addedWhenFilterValue = value,
+            () => addedWhenFilterOperator,
+            value => addedWhenFilterOperator = value);
     }
 
-    private RenderFragment? BuildTextFilterTemplate()
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildChangedWhenFilterTemplate()
     {
-        return null;
+        return BuildDateFilterTemplate(
+            () => changedWhenFilterValue,
+            value => changedWhenFilterValue = value,
+            () => changedWhenFilterOperator,
+            value => changedWhenFilterOperator = value);
     }
 
-    private RenderFragment? BuildDateFilterTemplate()
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildDateFilterTemplate(
+        Func<DateTime?> getValue,
+        Action<DateTime?> setValue,
+        Func<string> getOperator,
+        Action<string> setOperator)
     {
-        return null;
+        return context => builder =>
+        {
+            var seq = 0;
+            builder.OpenElement(seq++, "div");
+            builder.AddAttribute(seq++, "class", "filter-row-cell");
+
+            builder.OpenComponent<DxComboBox<FilterOperatorOption, string>>(seq++);
+            builder.AddAttribute(seq++, "Data", filterOperators);
+            builder.AddAttribute(seq++, "TextFieldName", "Text");
+            builder.AddAttribute(seq++, "ValueFieldName", "Value");
+            builder.AddAttribute(seq++, "Value", getOperator());
+            builder.AddAttribute(seq++, "ValueChanged", EventCallback.Factory.Create<string>(this, value =>
+            {
+                setOperator(value);
+                UpdateFilterCriteria(context, value, getValue());
+            }));
+            builder.AddAttribute(seq++, "CssClass", "filter-operator");
+            builder.CloseComponent();
+
+            builder.OpenComponent<DxDateEdit<DateTime?>>(seq++);
+            builder.AddAttribute(seq++, "Date", getValue());
+            builder.AddAttribute(seq++, "DateChanged", EventCallback.Factory.Create<DateTime?>(this, value =>
+            {
+                setValue(value);
+                UpdateFilterCriteria(context, getOperator(), value);
+            }));
+            builder.AddAttribute(seq++, "ClearButtonDisplayMode", DataEditorClearButtonDisplayMode.Auto);
+            builder.AddAttribute(seq++, "CssClass", "filter-value");
+            builder.CloseComponent();
+
+            builder.CloseElement();
+        };
+    }
+
+    private void UpdateFilterCriteria(GridDataColumnFilterRowCellTemplateContext context, string op, DateTime? value)
+    {
+        if (!value.HasValue)
+        {
+            context.FilterCriteria = null;
+            return;
+        }
+
+        var prop = new OperandProperty(context.DataColumn.FieldName);
+        var date = value.Value.Date;
+        context.FilterCriteria = op switch
+        {
+            "=" => new GroupOperator(GroupOperatorType.And, prop >= date, prop < date.AddDays(1)),
+            "<" => prop < date,
+            "<=" => prop < date.AddDays(1),
+            ">" => prop >= date.AddDays(1),
+            ">=" => prop >= date,
+            _ => prop == date
+        };
     }
 
     private sealed class BandLayout
@@ -830,4 +888,10 @@ else
         public int Value { get; set; }
         public string Text { get; set; } = string.Empty;
     }
+
+    private sealed class FilterOperatorOption
+    {
+        public string Value { get; set; } = string.Empty;
+        public string Text { get; set; } = string.Empty;
+    }
 }
diff --git a/DbFirst.BlazorWasm/Components/MassDataGrid.razor b/DbFirst.BlazorWasm/Components/MassDataGrid.razor
index f29fee4..a8c4f2c 100644
--- a/DbFirst.BlazorWasm/Components/MassDataGrid.razor
+++ b/DbFirst.BlazorWasm/Components/MassDataGrid.razor
@@ -3,6 +3,7 @@
 @using Microsoft.AspNetCore.Components.Rendering
 @using Microsoft.AspNetCore.Components.Forms
 @using DevExpress.Blazor
+@using DevExpress.Data.Filtering
 @inject MassDataApiClient Api
 @inject LayoutApiClient LayoutApi
 @inject IJSRuntime JsRuntime
@@ -96,6 +97,25 @@
     .band-columns {
         max-width: 720px;
     }
+    .filter-row-cell {
+        display: flex;
+        align-items: center;
+        gap: 4px;
+        flex-wrap: wrap;
+    }
+    .filter-operator {
+        width: 52px;
+        min-width: 52px;
+        flex: 0 0 52px;
+    }
+    .filter-value {
+        min-width: 140px;
+        flex: 1 1 140px;
+    }
+    .filter-value-amount {
+        min-width: 110px;
+        flex-basis: 110px;
+    }
 </style>
 
 @if (!string.IsNullOrWhiteSpace(errorMessage))
@@ -234,6 +254,12 @@ else
     private int pageCount = 1;
     private int? pageSize = 100;
     private string popupHeaderText = "Edit";
+    private decimal? amountFilterValue;
+    private string amountFilterOperator = "=";
+    private DateTime? addedWhenFilterValue;
+    private string addedWhenFilterOperator = "=";
+    private DateTime? changedWhenFilterValue;
+    private string changedWhenFilterOperator = "=";
     private EditContext? editContext;
     private ValidationMessageStore? validationMessageStore;
     private IGrid? gridRef;
@@ -280,6 +306,17 @@ else
         new() { Value = 0, Text = "PRMassdata_UpsertByCustomerName" }
     };
 
+    private readonly List<FilterOperatorOption> filterOperators = new()
+    {
+        new() { Value = "=", Text = "=" },
+        new() { Value = "<", Text = "<" },
+        new() { Value = ">", Text = ">" },
+        new() { Value = "<=", Text = "<=" },
+        new() { Value = ">=", Text = ">=" }
+    };
+
+    private bool gridLayoutApplied;
+
     protected override async Task OnInitializedAsync()
     {
         columnLookup = columnDefinitions.ToDictionary(column => column.FieldName, StringComparer.OrdinalIgnoreCase);
@@ -601,9 +638,163 @@ else
             builder.AddAttribute(seq++, "ReadOnly", true);
         }
 
+        if (string.Equals(column.FieldName, nameof(MassDataReadDto.Amount), StringComparison.OrdinalIgnoreCase))
+        {
+            builder.AddAttribute(seq++, "FilterRowCellTemplate", BuildAmountFilterTemplate());
+        }
+        else if (string.Equals(column.FieldName, nameof(MassDataReadDto.AddedWhen), StringComparison.OrdinalIgnoreCase))
+        {
+            builder.AddAttribute(seq++, "FilterRowCellTemplate", BuildAddedWhenFilterTemplate());
+        }
+        else if (string.Equals(column.FieldName, nameof(MassDataReadDto.ChangedWhen), StringComparison.OrdinalIgnoreCase))
+        {
+            builder.AddAttribute(seq++, "FilterRowCellTemplate", BuildChangedWhenFilterTemplate());
+        }
+
         builder.CloseComponent();
     }
 
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildAmountFilterTemplate()
+    {
+        return BuildNumberFilterTemplate(
+            () => amountFilterValue,
+            value => amountFilterValue = value,
+            () => amountFilterOperator,
+            value => amountFilterOperator = value);
+    }
+
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildAddedWhenFilterTemplate()
+    {
+        return BuildDateFilterTemplate(
+            () => addedWhenFilterValue,
+            value => addedWhenFilterValue = value,
+            () => addedWhenFilterOperator,
+            value => addedWhenFilterOperator = value);
+    }
+
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildChangedWhenFilterTemplate()
+    {
+        return BuildDateFilterTemplate(
+            () => changedWhenFilterValue,
+            value => changedWhenFilterValue = value,
+            () => changedWhenFilterOperator,
+            value => changedWhenFilterOperator = value);
+    }
+
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildNumberFilterTemplate(
+        Func<decimal?> getValue,
+        Action<decimal?> setValue,
+        Func<string> getOperator,
+        Action<string> setOperator)
+    {
+        return context => builder =>
+        {
+            var seq = 0;
+            builder.OpenElement(seq++, "div");
+            builder.AddAttribute(seq++, "class", "filter-row-cell");
+
+            builder.OpenComponent<DxComboBox<FilterOperatorOption, string>>(seq++);
+            builder.AddAttribute(seq++, "Data", filterOperators);
+            builder.AddAttribute(seq++, "TextFieldName", "Text");
+            builder.AddAttribute(seq++, "ValueFieldName", "Value");
+            builder.AddAttribute(seq++, "Value", getOperator());
+            builder.AddAttribute(seq++, "ValueChanged", EventCallback.Factory.Create<string>(this, value =>
+            {
+                setOperator(value);
+                UpdateFilterCriteria(context, value, getValue());
+            }));
+            builder.AddAttribute(seq++, "CssClass", "filter-operator");
+            builder.CloseComponent();
+
+            builder.OpenComponent<DxSpinEdit<decimal?>>(seq++);
+            builder.AddAttribute(seq++, "Value", getValue());
+            builder.AddAttribute(seq++, "ValueChanged", EventCallback.Factory.Create<decimal?>(this, value =>
+            {
+                setValue(value);
+                UpdateFilterCriteria(context, getOperator(), value);
+            }));
+            builder.AddAttribute(seq++, "ClearButtonDisplayMode", DataEditorClearButtonDisplayMode.Auto);
+            builder.AddAttribute(seq++, "CssClass", "filter-value filter-value-amount");
+            builder.CloseComponent();
+
+            builder.CloseElement();
+        };
+    }
+
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildDateFilterTemplate(
+        Func<DateTime?> getValue,
+        Action<DateTime?> setValue,
+        Func<string> getOperator,
+        Action<string> setOperator)
+    {
+        return context => builder =>
+        {
+            var seq = 0;
+            builder.OpenElement(seq++, "div");
+            builder.AddAttribute(seq++, "class", "filter-row-cell");
+
+            builder.OpenComponent<DxComboBox<FilterOperatorOption, string>>(seq++);
+            builder.AddAttribute(seq++, "Data", filterOperators);
+            builder.AddAttribute(seq++, "TextFieldName", "Text");
+            builder.AddAttribute(seq++, "ValueFieldName", "Value");
+            builder.AddAttribute(seq++, "Value", getOperator());
+            builder.AddAttribute(seq++, "ValueChanged", EventCallback.Factory.Create<string>(this, value =>
+            {
+                setOperator(value);
+                UpdateFilterCriteria(context, value, getValue());
+            }));
+            builder.AddAttribute(seq++, "CssClass", "filter-operator");
+            builder.CloseComponent();
+
+            builder.OpenComponent<DxDateEdit<DateTime?>>(seq++);
+            builder.AddAttribute(seq++, "Date", getValue());
+            builder.AddAttribute(seq++, "DateChanged", EventCallback.Factory.Create<DateTime?>(this, value =>
+            {
+                setValue(value);
+                UpdateFilterCriteria(context, getOperator(), value);
+            }));
+            builder.AddAttribute(seq++, "ClearButtonDisplayMode", DataEditorClearButtonDisplayMode.Auto);
+            builder.AddAttribute(seq++, "CssClass", "filter-value");
+            builder.CloseComponent();
+
+            builder.CloseElement();
+        };
+    }
+
+    private void UpdateFilterCriteria(GridDataColumnFilterRowCellTemplateContext context, string op, object? value)
+    {
+        if (value == null)
+        {
+            context.FilterCriteria = null;
+            return;
+        }
+
+        var prop = new OperandProperty(context.DataColumn.FieldName);
+        if (value is DateTime dateValue)
+        {
+            var date = dateValue.Date;
+            context.FilterCriteria = op switch
+            {
+                "=" => new GroupOperator(GroupOperatorType.And, prop >= date, prop < date.AddDays(1)),
+                "<" => prop < date,
+                "<=" => prop < date.AddDays(1),
+                ">" => prop >= date.AddDays(1),
+                ">=" => prop >= date,
+                _ => prop == date
+            };
+            return;
+        }
+
+        context.FilterCriteria = op switch
+        {
+            "<" => new BinaryOperator(prop, new OperandValue(value), BinaryOperatorType.Less),
+            ">" => new BinaryOperator(prop, new OperandValue(value), BinaryOperatorType.Greater),
+            "<=" => new BinaryOperator(prop, new OperandValue(value), BinaryOperatorType.LessOrEqual),
+            ">=" => new BinaryOperator(prop, new OperandValue(value), BinaryOperatorType.GreaterOrEqual),
+            _ => new BinaryOperator(prop, new OperandValue(value), BinaryOperatorType.Equal)
+        };
+    }
+
     private void SetEditContext(EditContext context)
     {
         if (editContext == context)
@@ -808,7 +999,11 @@ else
         public string Text { get; set; } = string.Empty;
     }
 
-    private bool gridLayoutApplied;
+    private sealed class FilterOperatorOption
+    {
+        public string Value { get; set; } = string.Empty;
+        public string Text { get; set; } = string.Empty;
+    }
 
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
diff --git a/DbFirst.BlazorWebApp/Components/CatalogsGrid.razor b/DbFirst.BlazorWebApp/Components/CatalogsGrid.razor
index 48c62e5..55c5290 100644
--- a/DbFirst.BlazorWebApp/Components/CatalogsGrid.razor
+++ b/DbFirst.BlazorWebApp/Components/CatalogsGrid.razor
@@ -3,6 +3,7 @@
 @using Microsoft.AspNetCore.Components.Rendering
 @using Microsoft.AspNetCore.Components.Forms
 @using DevExpress.Blazor
+@using DevExpress.Data.Filtering
 @inject CatalogApiClient Api
 @inject LayoutApiClient LayoutApi
 @inject IJSRuntime JsRuntime
@@ -32,6 +33,21 @@
     .band-columns {
         max-width: 720px;
     }
+    .filter-row-cell {
+        display: flex;
+        align-items: center;
+        gap: 4px;
+        flex-wrap: wrap;
+    }
+    .filter-operator {
+        width: 52px;
+        min-width: 52px;
+        flex: 0 0 52px;
+    }
+    .filter-value {
+        min-width: 140px;
+        flex: 1 1 140px;
+    }
 </style>
 
 @if (!string.IsNullOrWhiteSpace(errorMessage))
@@ -145,6 +161,10 @@ else
     private ValidationMessageStore? validationMessageStore;
     private IGrid? gridRef;
     private string popupHeaderText = "Edit";
+    private DateTime? addedWhenFilterValue;
+    private string addedWhenFilterOperator = "=";
+    private DateTime? changedWhenFilterValue;
+    private string changedWhenFilterOperator = "=";
     private const string LayoutType = "GRID_BANDS";
     private const string LayoutKey = "CatalogsGrid";
     private const string LayoutUserStorageKey = "layoutUser";
@@ -171,7 +191,17 @@ else
         new() { Value = 1, Text = "PRTBMY_CATALOG_SAVE" }
     };
 
+    private readonly List<FilterOperatorOption> filterOperators = new()
+    {
+        new() { Value = "=", Text = "=" },
+        new() { Value = "<", Text = "<" },
+        new() { Value = ">", Text = ">" },
+        new() { Value = "<=", Text = "<=" },
+        new() { Value = ">=", Text = ">=" }
+    };
+
     private bool CanSaveBandLayout => !string.IsNullOrWhiteSpace(layoutUser);
+    private bool gridLayoutApplied;
 
     protected override async Task OnInitializedAsync()
     {
@@ -181,6 +211,16 @@ else
         await LoadCatalogs();
     }
 
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (!gridLayoutApplied && gridRef != null && bandLayout.GridLayout != null)
+        {
+            gridRef.LoadLayout(bandLayout.GridLayout);
+            gridLayoutApplied = true;
+            await InvokeAsync(StateHasChanged);
+        }
+    }
+
     private void SetEditContext(EditContext context)
     {
         if (editContext == context)
@@ -474,6 +514,33 @@ else
         UpdateBandOptions();
     }
 
+    private async Task ResetBandLayoutAsync()
+    {
+        if (string.IsNullOrWhiteSpace(layoutUser))
+        {
+            return;
+        }
+
+        await LayoutApi.DeleteAsync(LayoutType, LayoutKey, layoutUser);
+        bandLayout = new BandLayout();
+        columnBandAssignments.Clear();
+        UpdateBandOptions();
+        infoMessage = "Band-Layout zurückgesetzt.";
+    }
+
+    private void ApplyColumnLayoutFromStorage()
+    {
+        foreach (var column in columnDefinitions)
+        {
+            if (bandLayout.ColumnWidths.TryGetValue(column.FieldName, out var width) && !string.IsNullOrWhiteSpace(width))
+            {
+                column.Width = width;
+            }
+        }
+
+        columnLookup = columnDefinitions.ToDictionary(column => column.FieldName, StringComparer.OrdinalIgnoreCase);
+    }
+
     private void AddBand()
     {
         bandLayout.Bands.Add(new BandDefinition
@@ -637,9 +704,97 @@ else
             builder.AddAttribute(seq++, "ReadOnly", true);
         }
 
+        if (string.Equals(column.FieldName, nameof(CatalogReadDto.AddedWhen), StringComparison.OrdinalIgnoreCase))
+        {
+            builder.AddAttribute(seq++, "FilterRowCellTemplate", BuildAddedWhenFilterTemplate());
+        }
+        else if (string.Equals(column.FieldName, nameof(CatalogReadDto.ChangedWhen), StringComparison.OrdinalIgnoreCase))
+        {
+            builder.AddAttribute(seq++, "FilterRowCellTemplate", BuildChangedWhenFilterTemplate());
+        }
+
         builder.CloseComponent();
     }
 
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildAddedWhenFilterTemplate()
+    {
+        return BuildDateFilterTemplate(
+            () => addedWhenFilterValue,
+            value => addedWhenFilterValue = value,
+            () => addedWhenFilterOperator,
+            value => addedWhenFilterOperator = value);
+    }
+
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildChangedWhenFilterTemplate()
+    {
+        return BuildDateFilterTemplate(
+            () => changedWhenFilterValue,
+            value => changedWhenFilterValue = value,
+            () => changedWhenFilterOperator,
+            value => changedWhenFilterOperator = value);
+    }
+
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildDateFilterTemplate(
+        Func<DateTime?> getValue,
+        Action<DateTime?> setValue,
+        Func<string> getOperator,
+        Action<string> setOperator)
+    {
+        return context => builder =>
+        {
+            var seq = 0;
+            builder.OpenElement(seq++, "div");
+            builder.AddAttribute(seq++, "class", "filter-row-cell");
+
+            builder.OpenComponent<DxComboBox<FilterOperatorOption, string>>(seq++);
+            builder.AddAttribute(seq++, "Data", filterOperators);
+            builder.AddAttribute(seq++, "TextFieldName", "Text");
+            builder.AddAttribute(seq++, "ValueFieldName", "Value");
+            builder.AddAttribute(seq++, "Value", getOperator());
+            builder.AddAttribute(seq++, "ValueChanged", EventCallback.Factory.Create<string>(this, value =>
+            {
+                setOperator(value);
+                UpdateFilterCriteria(context, value, getValue());
+            }));
+            builder.AddAttribute(seq++, "CssClass", "filter-operator");
+            builder.CloseComponent();
+
+            builder.OpenComponent<DxDateEdit<DateTime?>>(seq++);
+            builder.AddAttribute(seq++, "Date", getValue());
+            builder.AddAttribute(seq++, "DateChanged", EventCallback.Factory.Create<DateTime?>(this, value =>
+            {
+                setValue(value);
+                UpdateFilterCriteria(context, getOperator(), value);
+            }));
+            builder.AddAttribute(seq++, "ClearButtonDisplayMode", DataEditorClearButtonDisplayMode.Auto);
+            builder.AddAttribute(seq++, "CssClass", "filter-value");
+            builder.CloseComponent();
+
+            builder.CloseElement();
+        };
+    }
+
+    private void UpdateFilterCriteria(GridDataColumnFilterRowCellTemplateContext context, string op, DateTime? value)
+    {
+        if (!value.HasValue)
+        {
+            context.FilterCriteria = null;
+            return;
+        }
+
+        var prop = new OperandProperty(context.DataColumn.FieldName);
+        var date = value.Value.Date;
+        context.FilterCriteria = op switch
+        {
+            "=" => new GroupOperator(GroupOperatorType.And, prop >= date, prop < date.AddDays(1)),
+            "<" => prop < date,
+            "<=" => prop < date.AddDays(1),
+            ">" => prop >= date.AddDays(1),
+            ">=" => prop >= date,
+            _ => prop == date
+        };
+    }
+
     private sealed class BandLayout
     {
         public List<BandDefinition> Bands { get; set; } = new();
@@ -693,42 +848,9 @@ else
         public string Text { get; set; } = string.Empty;
     }
 
-    private async Task ResetBandLayoutAsync()
+    private sealed class FilterOperatorOption
     {
-        if (string.IsNullOrWhiteSpace(layoutUser))
-        {
-            return;
-        }
-
-        await LayoutApi.DeleteAsync(LayoutType, LayoutKey, layoutUser);
-        bandLayout = new BandLayout();
-        columnBandAssignments.Clear();
-        UpdateBandOptions();
-        infoMessage = "Band-Layout zurückgesetzt.";
-    }
-
-    private void ApplyColumnLayoutFromStorage()
-    {
-        foreach (var column in columnDefinitions)
-        {
-            if (bandLayout.ColumnWidths.TryGetValue(column.FieldName, out var width) && !string.IsNullOrWhiteSpace(width))
-            {
-                column.Width = width;
-            }
-        }
-
-        columnLookup = columnDefinitions.ToDictionary(column => column.FieldName, StringComparer.OrdinalIgnoreCase);
-    }
-
-    private bool gridLayoutApplied;
-
-    protected override async Task OnAfterRenderAsync(bool firstRender)
-    {
-        if (!gridLayoutApplied && gridRef != null && bandLayout.GridLayout != null)
-        {
-            gridRef.LoadLayout(bandLayout.GridLayout);
-            gridLayoutApplied = true;
-            await InvokeAsync(StateHasChanged);
-        }
+        public string Value { get; set; } = string.Empty;
+        public string Text { get; set; } = string.Empty;
     }
 }
diff --git a/DbFirst.BlazorWebApp/Components/MassDataGrid.razor b/DbFirst.BlazorWebApp/Components/MassDataGrid.razor
index 72ee7da..c6a739c 100644
--- a/DbFirst.BlazorWebApp/Components/MassDataGrid.razor
+++ b/DbFirst.BlazorWebApp/Components/MassDataGrid.razor
@@ -3,6 +3,7 @@
 @using Microsoft.AspNetCore.Components.Rendering
 @using Microsoft.AspNetCore.Components.Forms
 @using DevExpress.Blazor
+@using DevExpress.Data.Filtering
 @inject MassDataApiClient Api
 @inject LayoutApiClient LayoutApi
 @inject IJSRuntime JsRuntime
@@ -96,6 +97,25 @@
     .band-columns {
         max-width: 720px;
     }
+    .filter-row-cell {
+        display: flex;
+        align-items: center;
+        gap: 4px;
+        flex-wrap: wrap;
+    }
+    .filter-operator {
+        width: 52px;
+        min-width: 52px;
+        flex: 0 0 52px;
+    }
+    .filter-value {
+        min-width: 140px;
+        flex: 1 1 140px;
+    }
+    .filter-value-amount {
+        min-width: 110px;
+        flex-basis: 110px;
+    }
 </style>
 
 @if (!string.IsNullOrWhiteSpace(errorMessage))
@@ -234,6 +254,12 @@ else
     private int pageCount = 1;
     private int? pageSize = 100;
     private string popupHeaderText = "Edit";
+    private decimal? amountFilterValue;
+    private string amountFilterOperator = "=";
+    private DateTime? addedWhenFilterValue;
+    private string addedWhenFilterOperator = "=";
+    private DateTime? changedWhenFilterValue;
+    private string changedWhenFilterOperator = "=";
     private EditContext? editContext;
     private ValidationMessageStore? validationMessageStore;
     private IGrid? gridRef;
@@ -280,6 +306,17 @@ else
         new() { Value = 0, Text = "PRMassdata_UpsertByCustomerName" }
     };
 
+    private readonly List<FilterOperatorOption> filterOperators = new()
+    {
+        new() { Value = "=", Text = "=" },
+        new() { Value = "<", Text = "<" },
+        new() { Value = ">", Text = ">" },
+        new() { Value = "<=", Text = "<=" },
+        new() { Value = ">=", Text = ">=" }
+    };
+
+    private bool gridLayoutApplied;
+
     protected override async Task OnInitializedAsync()
     {
         columnLookup = columnDefinitions.ToDictionary(column => column.FieldName, StringComparer.OrdinalIgnoreCase);
@@ -356,7 +393,6 @@ else
 
         columnBandAssignments = BuildAssignmentsFromLayout(bandLayout);
         ApplyColumnLayoutFromStorage();
-        //ApplyBandOrderingFromColumnOrder();
         UpdateBandOptions();
     }
 
@@ -426,49 +462,6 @@ else
         infoMessage = "Band-Layout zurückgesetzt.";
     }
 
-    private void ApplyBandOrderingFromColumnOrder()
-    {
-        if (bandLayout.ColumnOrder.Count == 0)
-        {
-            return;
-        }
-
-        var bandById = bandLayout.Bands.ToDictionary(band => band.Id, StringComparer.OrdinalIgnoreCase);
-        var orderedBandIds = new List<string>();
-        var orderedColumnsByBand = bandLayout.Bands.ToDictionary(
-            band => band.Id,
-            _ => new List<string>(),
-            StringComparer.OrdinalIgnoreCase);
-
-        foreach (var field in bandLayout.ColumnOrder)
-        {
-            if (columnBandAssignments.TryGetValue(field, out var bandId) && bandById.ContainsKey(bandId))
-            {
-                if (!orderedBandIds.Contains(bandId, StringComparer.OrdinalIgnoreCase))
-                {
-                    orderedBandIds.Add(bandId);
-                }
-
-                orderedColumnsByBand[bandId].Add(field);
-            }
-        }
-
-        foreach (var band in bandLayout.Bands)
-        {
-            var orderedColumns = orderedColumnsByBand[band.Id];
-            orderedColumns.AddRange(band.Columns.Where(column => !orderedColumns.Contains(column, StringComparer.OrdinalIgnoreCase)));
-            band.Columns = orderedColumns;
-        }
-
-        if (orderedBandIds.Count > 0)
-        {
-            bandLayout.Bands = orderedBandIds
-                .Select(id => bandById[id])
-                .Concat(bandLayout.Bands.Where(band => !orderedBandIds.Contains(band.Id, StringComparer.OrdinalIgnoreCase)))
-                .ToList();
-        }
-    }
-
     private void ApplyColumnLayoutFromStorage()
     {
         foreach (var column in columnDefinitions)
@@ -645,9 +638,163 @@ else
             builder.AddAttribute(seq++, "ReadOnly", true);
         }
 
+        if (string.Equals(column.FieldName, nameof(MassDataReadDto.Amount), StringComparison.OrdinalIgnoreCase))
+        {
+            builder.AddAttribute(seq++, "FilterRowCellTemplate", BuildAmountFilterTemplate());
+        }
+        else if (string.Equals(column.FieldName, nameof(MassDataReadDto.AddedWhen), StringComparison.OrdinalIgnoreCase))
+        {
+            builder.AddAttribute(seq++, "FilterRowCellTemplate", BuildAddedWhenFilterTemplate());
+        }
+        else if (string.Equals(column.FieldName, nameof(MassDataReadDto.ChangedWhen), StringComparison.OrdinalIgnoreCase))
+        {
+            builder.AddAttribute(seq++, "FilterRowCellTemplate", BuildChangedWhenFilterTemplate());
+        }
+
         builder.CloseComponent();
     }
 
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildAmountFilterTemplate()
+    {
+        return BuildNumberFilterTemplate(
+            () => amountFilterValue,
+            value => amountFilterValue = value,
+            () => amountFilterOperator,
+            value => amountFilterOperator = value);
+    }
+
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildAddedWhenFilterTemplate()
+    {
+        return BuildDateFilterTemplate(
+            () => addedWhenFilterValue,
+            value => addedWhenFilterValue = value,
+            () => addedWhenFilterOperator,
+            value => addedWhenFilterOperator = value);
+    }
+
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildChangedWhenFilterTemplate()
+    {
+        return BuildDateFilterTemplate(
+            () => changedWhenFilterValue,
+            value => changedWhenFilterValue = value,
+            () => changedWhenFilterOperator,
+            value => changedWhenFilterOperator = value);
+    }
+
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildNumberFilterTemplate(
+        Func<decimal?> getValue,
+        Action<decimal?> setValue,
+        Func<string> getOperator,
+        Action<string> setOperator)
+    {
+        return context => builder =>
+        {
+            var seq = 0;
+            builder.OpenElement(seq++, "div");
+            builder.AddAttribute(seq++, "class", "filter-row-cell");
+
+            builder.OpenComponent<DxComboBox<FilterOperatorOption, string>>(seq++);
+            builder.AddAttribute(seq++, "Data", filterOperators);
+            builder.AddAttribute(seq++, "TextFieldName", "Text");
+            builder.AddAttribute(seq++, "ValueFieldName", "Value");
+            builder.AddAttribute(seq++, "Value", getOperator());
+            builder.AddAttribute(seq++, "ValueChanged", EventCallback.Factory.Create<string>(this, value =>
+            {
+                setOperator(value);
+                UpdateFilterCriteria(context, value, getValue());
+            }));
+            builder.AddAttribute(seq++, "CssClass", "filter-operator");
+            builder.CloseComponent();
+
+            builder.OpenComponent<DxSpinEdit<decimal?>>(seq++);
+            builder.AddAttribute(seq++, "Value", getValue());
+            builder.AddAttribute(seq++, "ValueChanged", EventCallback.Factory.Create<decimal?>(this, value =>
+            {
+                setValue(value);
+                UpdateFilterCriteria(context, getOperator(), value);
+            }));
+            builder.AddAttribute(seq++, "ClearButtonDisplayMode", DataEditorClearButtonDisplayMode.Auto);
+            builder.AddAttribute(seq++, "CssClass", "filter-value filter-value-amount");
+            builder.CloseComponent();
+
+            builder.CloseElement();
+        };
+    }
+
+    private RenderFragment<GridDataColumnFilterRowCellTemplateContext> BuildDateFilterTemplate(
+        Func<DateTime?> getValue,
+        Action<DateTime?> setValue,
+        Func<string> getOperator,
+        Action<string> setOperator)
+    {
+        return context => builder =>
+        {
+            var seq = 0;
+            builder.OpenElement(seq++, "div");
+            builder.AddAttribute(seq++, "class", "filter-row-cell");
+
+            builder.OpenComponent<DxComboBox<FilterOperatorOption, string>>(seq++);
+            builder.AddAttribute(seq++, "Data", filterOperators);
+            builder.AddAttribute(seq++, "TextFieldName", "Text");
+            builder.AddAttribute(seq++, "ValueFieldName", "Value");
+            builder.AddAttribute(seq++, "Value", getOperator());
+            builder.AddAttribute(seq++, "ValueChanged", EventCallback.Factory.Create<string>(this, value =>
+            {
+                setOperator(value);
+                UpdateFilterCriteria(context, value, getValue());
+            }));
+            builder.AddAttribute(seq++, "CssClass", "filter-operator");
+            builder.CloseComponent();
+
+            builder.OpenComponent<DxDateEdit<DateTime?>>(seq++);
+            builder.AddAttribute(seq++, "Date", getValue());
+            builder.AddAttribute(seq++, "DateChanged", EventCallback.Factory.Create<DateTime?>(this, value =>
+            {
+                setValue(value);
+                UpdateFilterCriteria(context, getOperator(), value);
+            }));
+            builder.AddAttribute(seq++, "ClearButtonDisplayMode", DataEditorClearButtonDisplayMode.Auto);
+            builder.AddAttribute(seq++, "CssClass", "filter-value");
+            builder.CloseComponent();
+
+            builder.CloseElement();
+        };
+    }
+
+    private void UpdateFilterCriteria(GridDataColumnFilterRowCellTemplateContext context, string op, object? value)
+    {
+        if (value == null)
+        {
+            context.FilterCriteria = null;
+            return;
+        }
+
+        var prop = new OperandProperty(context.DataColumn.FieldName);
+        if (value is DateTime dateValue)
+        {
+            var date = dateValue.Date;
+            context.FilterCriteria = op switch
+            {
+                "=" => new GroupOperator(GroupOperatorType.And, prop >= date, prop < date.AddDays(1)),
+                "<" => prop < date,
+                "<=" => prop < date.AddDays(1),
+                ">" => prop >= date.AddDays(1),
+                ">=" => prop >= date,
+                _ => prop == date
+            };
+            return;
+        }
+
+        context.FilterCriteria = op switch
+        {
+            "<" => new BinaryOperator(prop, new OperandValue(value), BinaryOperatorType.Less),
+            ">" => new BinaryOperator(prop, new OperandValue(value), BinaryOperatorType.Greater),
+            "<=" => new BinaryOperator(prop, new OperandValue(value), BinaryOperatorType.LessOrEqual),
+            ">=" => new BinaryOperator(prop, new OperandValue(value), BinaryOperatorType.GreaterOrEqual),
+            _ => new BinaryOperator(prop, new OperandValue(value), BinaryOperatorType.Equal)
+        };
+    }
+
     private void SetEditContext(EditContext context)
     {
         if (editContext == context)
@@ -783,7 +930,7 @@ else
         e.Cancel = true;
         return Task.CompletedTask;
     }
-
+    
     private sealed class BandLayout
     {
         public List<BandDefinition> Bands { get; set; } = new();
@@ -852,7 +999,11 @@ else
         public string Text { get; set; } = string.Empty;
     }
 
-    private bool gridLayoutApplied;
+    private sealed class FilterOperatorOption
+    {
+        public string Value { get; set; } = string.Empty;
+        public string Text { get; set; } = string.Empty;
+    }
 
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {