Grid time columns sort by time, not by their text, in Lite and the Darling viewer

Darling/PerformanceMonitor.Darling.Viewer/FinOpsTab.xaml

@@ -407,7 +407,7 @@
                             <DataGrid x:Name="FinOpsProvisioningTrendGrid" Style="{StaticResource DarkGrid}" RowStyle="{StaticResource FinOpsRowStyle}"
                                       CanUserSortColumns="False" MaxHeight="200">
                                 <DataGrid.Columns>
-                                    <DataGridTextColumn Header="Day" Binding="{Binding DayDisplay}" Width="100"/>
+                                    <DataGridTextColumn Header="Day" Binding="{Binding DayDisplay}" Width="100" SortMemberPath="Day"/>
                                     <DataGridTextColumn Header="Status" Binding="{Binding StatusDisplay}" Width="130">
                                         <DataGridTextColumn.ElementStyle>
                                             <Style TargetType="TextBlock">
@@ -822,7 +822,7 @@
                                     <StackPanel>
                                         <DataGrid x:Name="FinOpsMemoryGrantEfficiencyDataGrid" Style="{StaticResource DarkGrid}" RowStyle="{StaticResource FinOpsRowStyle}" MaxHeight="250">
                                             <DataGrid.Columns>
-                                                <DataGridTextColumn Binding="{Binding DayDisplay}" Width="100"><DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="DayDisplay" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Day" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header></DataGridTextColumn>
+                                                <DataGridTextColumn Binding="{Binding DayDisplay}" Width="100" SortMemberPath="Day"><DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="DayDisplay" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Day" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header></DataGridTextColumn>
                                                 <DataGridTextColumn Binding="{Binding AvgGrantedMb, StringFormat=N1}" Width="120" ElementStyle="{StaticResource NumericCell}"><DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="AvgGrantedMb" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Avg Granted MB" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header></DataGridTextColumn>
                                                 <DataGridTextColumn Binding="{Binding AvgUsedMb, StringFormat=N1}" Width="110" ElementStyle="{StaticResource NumericCell}"><DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="AvgUsedMb" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Avg Used MB" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header></DataGridTextColumn>
                                                 <DataGridTextColumn Binding="{Binding EfficiencyPct, StringFormat=N1}" Width="100" ElementStyle="{StaticResource NumericCell}"><DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="EfficiencyPct" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Efficiency %" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header></DataGridTextColumn>

Darling/PerformanceMonitor.Darling.Viewer/JobHistoryTab.xaml

@@ -183,7 +183,7 @@
                             </StackPanel>
                         </DataGridTextColumn.Header>
                     </DataGridTextColumn>
-                    <DataGridTextColumn Binding="{Binding LastSuccessfulRunLocal}" Width="150">
+                    <DataGridTextColumn Binding="{Binding LastSuccessfulRunLocal}" Width="150" SortMemberPath="LastSuccessfulRunUtc">
                         <DataGridTextColumn.Header>
                             <StackPanel Orientation="Horizontal">
                                 <Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="LastSuccessfulRunLocal" Click="FilterButton_Click" Margin="0,0,4,0"/>

Darling/PerformanceMonitor.Darling.Viewer/MuteRulesWindow.xaml

@@ -50,7 +50,7 @@
                     <DataGridTextColumn Header="Metric" Binding="{Binding MetricName}" Width="130"/>
                     <DataGridTextColumn Header="Server" Binding="{Binding ServerName}" Width="130"/>
                     <DataGridTextColumn Header="Reason" Binding="{Binding Reason}" Width="*"/>
-                    <DataGridTextColumn Header="Expires" Binding="{Binding ExpiresDisplay}" Width="140"/>
+                    <DataGridTextColumn Header="Expires" Binding="{Binding ExpiresDisplay}" Width="140" SortMemberPath="ExpiresAtUtc"/>
                 </DataGrid.Columns>
             </DataGrid>
             <TextBlock x:Name="NoRulesMessage"

Darling/PerformanceMonitor.Darling.Viewer/ProcedureHistoryWindow.xaml

@@ -94,8 +94,8 @@
                   ContextMenu="{StaticResource DataGridContextMenu}">
             <DataGrid.Columns>
                 <DataGridTextColumn Header="Collection Time" Binding="{Binding CollectionTimeLocal}" SortMemberPath="CollectionTime" SortDirection="Descending" Width="130"/>
-                <DataGridTextColumn Header="Last Execution" Binding="{Binding LastExecutionTimeLocal}" Width="130"/>
-                <DataGridTextColumn Header="Cached Time" Binding="{Binding CachedTimeLocal}" Width="130"/>
+                <DataGridTextColumn Header="Last Execution" Binding="{Binding LastExecutionTimeLocal}" Width="130" SortMemberPath="LastExecutionTime"/>
+                <DataGridTextColumn Header="Cached Time" Binding="{Binding CachedTimeLocal}" Width="130" SortMemberPath="CachedTime"/>
                 <DataGridTemplateColumn Header="Plan" Width="Auto" MinWidth="80">
                     <DataGridTemplateColumn.CellTemplate>
                         <DataTemplate>

Darling/PerformanceMonitor.Darling.Viewer/QueryStatsHistoryWindow.xaml

@@ -102,8 +102,8 @@
                   ContextMenu="{StaticResource DataGridContextMenu}">
             <DataGrid.Columns>
                 <DataGridTextColumn Header="Collection Time" Binding="{Binding CollectionTimeLocal}" SortMemberPath="CollectionTime" SortDirection="Descending" Width="130"/>
-                <DataGridTextColumn Header="Last Execution" Binding="{Binding LastExecutionTimeLocal}" Width="130"/>
-                <DataGridTextColumn Header="Creation Time" Binding="{Binding CreationTimeLocal}" Width="130"/>
+                <DataGridTextColumn Header="Last Execution" Binding="{Binding LastExecutionTimeLocal}" Width="130" SortMemberPath="LastExecutionTime"/>
+                <DataGridTextColumn Header="Creation Time" Binding="{Binding CreationTimeLocal}" Width="130" SortMemberPath="CreationTime"/>
                 <DataGridTemplateColumn Header="Plan" Width="Auto" MinWidth="80">
                     <DataGridTemplateColumn.CellTemplate>
                         <DataTemplate>

Darling/PerformanceMonitor.Darling.Viewer/ViewerDataService.Postgres.cs

@@ -135,6 +135,8 @@ public sealed class PostgresCollectorHealthRow
         public string StoreTable { get; init; } = "";
         public string Status { get; init; } = "";
         public string LastRun { get; init; } = "";
+        /// <summary>The UTC instant <see cref="LastRun"/> is formatted from. The column sorts by it, not by that text.</summary>
+        public DateTime? LastRunUtc { get; init; }
         public long Runs { get; init; }
         public long FailedRuns { get; init; }
         public long RowsCollected { get; init; }
@@ -215,6 +217,7 @@ public static List<PostgresCollectorHealthRow> BuildPostgresCollectorHealth(
                 LastRun = facts?.LastRunAt is { } at
                     ? ViewerTimeHelper.FormatForDisplay(at, "yyyy-MM-dd HH:mm")
                     : "",
+                LastRunUtc = facts?.LastRunAt,
                 Runs = facts?.Runs ?? 0,
                 FailedRuns = facts?.FailedRuns ?? 0,
                 RowsCollected = facts?.RowsCollected ?? 0,
@@ -344,6 +347,8 @@ confusing of the two. */
     public sealed record PgCpuUtilizationRow
     {
         public required string Time { get; init; }
+        /// <summary>The UTC instant <see cref="Time"/> is formatted from. The column sorts by it, not by that text.</summary>
+        public DateTime SampleTimeUtc { get; init; }
         public required double CpuPercent { get; init; }
     }
 
@@ -358,6 +363,7 @@ public async Task<List<PgCpuUtilizationRow>> GetPgCpuUtilizationHistoryAsync(
             .Select(s => new PgCpuUtilizationRow
             {
                 Time = ViewerTimeHelper.FormatForDisplay(s.SampleTimeUtc, "yyyy-MM-dd HH:mm"),
+                SampleTimeUtc = s.SampleTimeUtc,
                 CpuPercent = s.CpuPercent,
             })
             .ToList();

Darling/PerformanceMonitor.Darling.Viewer/ViewerDataService.SystemEvents.cs

@@ -63,6 +63,8 @@ public static string Local(DateTime? utc) =>
 public sealed class SchedulerIssueRow(SchedulerIssueRecord record)
 {
     public string EventTimeLocal => SystemEventRowFormat.Local(record.EventTime);
+    /// <summary>Raw naive-UTC event time (the XE @timestamp): the instant <see cref="EventTimeLocal"/> is formatted from. The Event Time column sorts by it, so the grid orders by time and not by that text.</summary>
+    public DateTime? EventTime => record.EventTime;
     public int? SqlCpuUtilization => record.SqlCpuUtilization;
     public int? OtherProcessCpu => record.OtherProcessCpu;
     public int? SystemIdle => record.SystemIdle;
@@ -79,6 +81,8 @@ public sealed class SchedulerIssueRow(SchedulerIssueRecord record)
 public sealed class SevereErrorRow(SevereErrorRecord record, string databaseName)
 {
     public string EventTimeLocal => SystemEventRowFormat.Local(record.EventTime);
+    /// <summary>Raw naive-UTC event time (the XE @timestamp): the instant <see cref="EventTimeLocal"/> is formatted from. The Event Time column sorts by it, so the grid orders by time and not by that text.</summary>
+    public DateTime? EventTime => record.EventTime;
     public int? ErrorNumber => record.ErrorNumber;
     public int? Severity => record.Severity;
     public int? State => record.State;
@@ -91,6 +95,8 @@ public sealed class SevereErrorRow(SevereErrorRecord record, string databaseName
 public sealed class MemoryConditionsRow(MemoryConditionsRecord record)
 {
     public string EventTimeLocal => SystemEventRowFormat.Local(record.EventTime);
+    /// <summary>Raw naive-UTC event time (the XE @timestamp): the instant <see cref="EventTimeLocal"/> is formatted from. The Event Time column sorts by it, so the grid orders by time and not by that text.</summary>
+    public DateTime? EventTime => record.EventTime;
     public string? LastNotification => record.LastNotification;
     public long? OutOfMemoryExceptions => record.OutOfMemoryExceptions;
     public bool? IsAnyPoolOutOfMemory => record.IsAnyPoolOutOfMemory;
@@ -128,6 +134,8 @@ public sealed class MemoryConditionsRow(MemoryConditionsRecord record)
 public sealed class MemoryBrokerRow(MemoryBrokerRecord record)
 {
     public string EventTimeLocal => SystemEventRowFormat.Local(record.EventTime);
+    /// <summary>Raw naive-UTC event time (the XE @timestamp): the instant <see cref="EventTimeLocal"/> is formatted from. The Event Time column sorts by it, so the grid orders by time and not by that text.</summary>
+    public DateTime? EventTime => record.EventTime;
     public long? BrokerId => record.BrokerId;
     public long? PoolMetadataId => record.PoolMetadataId;
     public long? DeltaTime => record.DeltaTime;
@@ -146,6 +154,8 @@ public sealed class MemoryBrokerRow(MemoryBrokerRecord record)
 public sealed class MemoryNodeOomRow(MemoryNodeOomRecord record)
 {
     public string EventTimeLocal => SystemEventRowFormat.Local(record.EventTime);
+    /// <summary>Raw naive-UTC event time (the XE @timestamp): the instant <see cref="EventTimeLocal"/> is formatted from. The Event Time column sorts by it, so the grid orders by time and not by that text.</summary>
+    public DateTime? EventTime => record.EventTime;
     public long? NodeId => record.NodeId;
     public long? MemoryNodeId => record.MemoryNodeId;
     public long? MemoryUtilizationPct => record.MemoryUtilizationPct;
@@ -179,6 +189,8 @@ public sealed class MemoryNodeOomRow(MemoryNodeOomRecord record)
 public sealed class SignificantWaitRow(SignificantWaitRecord record)
 {
     public string EventTimeLocal => SystemEventRowFormat.Local(record.EventTime);
+    /// <summary>Raw naive-UTC event time (the XE @timestamp): the instant <see cref="EventTimeLocal"/> is formatted from. The Event Time column sorts by it, so the grid orders by time and not by that text.</summary>
+    public DateTime? EventTime => record.EventTime;
     public string? WaitType => record.WaitType;
     public long? DurationMs => record.DurationMs;
     public long? SignalDurationMs => record.SignalDurationMs;
@@ -191,6 +203,8 @@ public sealed class SignificantWaitRow(SignificantWaitRecord record)
 public sealed class CpuTasksRow(CpuTasksRecord record)
 {
     public string EventTimeLocal => SystemEventRowFormat.Local(record.EventTime);
+    /// <summary>Raw naive-UTC event time (the XE @timestamp): the instant <see cref="EventTimeLocal"/> is formatted from. The Event Time column sorts by it, so the grid orders by time and not by that text.</summary>
+    public DateTime? EventTime => record.EventTime;
     public string? State => record.State;
     public long? MaxWorkers => record.MaxWorkers;
     public long? WorkersCreated => record.WorkersCreated;
@@ -207,6 +221,8 @@ public sealed class CpuTasksRow(CpuTasksRecord record)
 public sealed class IoIssuesRow(IoIssuesRecord record)
 {
     public string EventTimeLocal => SystemEventRowFormat.Local(record.EventTime);
+    /// <summary>Raw naive-UTC event time (the XE @timestamp): the instant <see cref="EventTimeLocal"/> is formatted from. The Event Time column sorts by it, so the grid orders by time and not by that text.</summary>
+    public DateTime? EventTime => record.EventTime;
     public string? State => record.State;
     public long? IoLatchTimeouts => record.IoLatchTimeouts;
     public long? IntervalLongIos => record.IntervalLongIos;