From b9a6d710e9a2c3e2f1245ab2658e8666fd893801 Mon Sep 17 00:00:00 2001
From: Erik Darling <2136037+erikdarlingdata@users.noreply.github.com>
Date: Sun, 15 Feb 2026 14:37:11 -0500
Subject: [PATCH] Add collector performance diagnostics to Lite UI (#40)

Expand the Collection Health tab into three sub-tabs:

- Health Summary: existing per-collector status grid (from #39)
- Collection Log: recent collection_log entries showing per-run timing
  (total, SQL, DuckDB split), rows collected, status, and errors
- Duration Trends: ScottPlot chart showing collector duration over time

Also adds:
- GetRecentCollectionLogAsync() query and CollectionLogRow model
- "Open Log File" button to open today's log in default editor
- Column-level filtering on the collection log grid

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 Lite/Controls/ServerTab.xaml                  | 123 ++++++++++++------
 Lite/Controls/ServerTab.xaml.cs               |  64 ++++++++-
 .../LocalDataService.CollectionHealth.cs      |  68 ++++++++++
 3 files changed, 217 insertions(+), 38 deletions(-)

diff --git a/Lite/Controls/ServerTab.xaml b/Lite/Controls/ServerTab.xaml
index 54c51ed7..7cb808dc 100644
--- a/Lite/Controls/ServerTab.xaml
+++ b/Lite/Controls/ServerTab.xaml
@@ -974,43 +974,92 @@
             <!-- Collection Health Tab -->
             <TabItem Header="Collection Health">
                 <Grid Margin="8">
-                    <DataGrid x:Name="CollectionHealthGrid"
-                              AutoGenerateColumns="False" IsReadOnly="True"
-                              RowStyle="{StaticResource GridRowStyle}"
-                              HeadersVisibility="Column" GridLinesVisibility="Horizontal">
-                        <DataGrid.Columns>
-                            <DataGridTextColumn Binding="{Binding CollectorName}" Width="180">
-                                <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="CollectorName" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Collector" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
-                            </DataGridTextColumn>
-                            <DataGridTextColumn Binding="{Binding HealthStatus}" Width="90">
-                                <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="HealthStatus" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Status" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
-                            </DataGridTextColumn>
-                            <DataGridTextColumn Binding="{Binding TotalRuns, StringFormat=N0}" Width="80">
-                                <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="TotalRuns" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Runs" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
-                            </DataGridTextColumn>
-                            <DataGridTextColumn Binding="{Binding SuccessCount, StringFormat=N0}" Width="80">
-                                <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="SuccessCount" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Success" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
-                            </DataGridTextColumn>
-                            <DataGridTextColumn Binding="{Binding ErrorCount, StringFormat=N0}" Width="80">
-                                <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="ErrorCount" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Errors" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
-                            </DataGridTextColumn>
-                            <DataGridTextColumn Binding="{Binding FailureRatePercent, StringFormat=N1}" Width="85">
-                                <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="FailureRatePercent" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Fail %" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
-                            </DataGridTextColumn>
-                            <DataGridTextColumn Binding="{Binding AvgDurationFormatted}" Width="100">
-                                <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="AvgDurationFormatted" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Avg Duration" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
-                            </DataGridTextColumn>
-                            <DataGridTextColumn Binding="{Binding LastSuccessFormatted}" Width="140">
-                                <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="LastSuccessFormatted" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Last Success" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
-                            </DataGridTextColumn>
-                            <DataGridTextColumn Binding="{Binding LastRunFormatted}" Width="140">
-                                <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="LastRunFormatted" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Last Run" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
-                            </DataGridTextColumn>
-                            <DataGridTextColumn Binding="{Binding LastError}" Width="*">
-                                <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="LastError" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Last Error" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
-                            </DataGridTextColumn>
-                        </DataGrid.Columns>
-                    </DataGrid>
+                    <TabControl Background="Transparent" BorderThickness="0">
+                        <TabItem Header="Health Summary">
+                            <DataGrid x:Name="CollectionHealthGrid"
+                                      AutoGenerateColumns="False" IsReadOnly="True"
+                                      RowStyle="{StaticResource GridRowStyle}"
+                                      HeadersVisibility="Column" GridLinesVisibility="Horizontal">
+                                <DataGrid.Columns>
+                                    <DataGridTextColumn Binding="{Binding CollectorName}" Width="180">
+                                        <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="CollectorName" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Collector" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                    </DataGridTextColumn>
+                                    <DataGridTextColumn Binding="{Binding HealthStatus}" Width="90">
+                                        <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="HealthStatus" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Status" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                    </DataGridTextColumn>
+                                    <DataGridTextColumn Binding="{Binding TotalRuns, StringFormat=N0}" Width="80">
+                                        <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="TotalRuns" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Runs" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                    </DataGridTextColumn>
+                                    <DataGridTextColumn Binding="{Binding SuccessCount, StringFormat=N0}" Width="80">
+                                        <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="SuccessCount" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Success" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                    </DataGridTextColumn>
+                                    <DataGridTextColumn Binding="{Binding ErrorCount, StringFormat=N0}" Width="80">
+                                        <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="ErrorCount" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Errors" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                    </DataGridTextColumn>
+                                    <DataGridTextColumn Binding="{Binding FailureRatePercent, StringFormat=N1}" Width="85">
+                                        <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="FailureRatePercent" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Fail %" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                    </DataGridTextColumn>
+                                    <DataGridTextColumn Binding="{Binding AvgDurationFormatted}" Width="100">
+                                        <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="AvgDurationFormatted" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Avg Duration" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                    </DataGridTextColumn>
+                                    <DataGridTextColumn Binding="{Binding LastSuccessFormatted}" Width="140">
+                                        <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="LastSuccessFormatted" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Last Success" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                    </DataGridTextColumn>
+                                    <DataGridTextColumn Binding="{Binding LastRunFormatted}" Width="140">
+                                        <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="LastRunFormatted" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Last Run" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                    </DataGridTextColumn>
+                                    <DataGridTextColumn Binding="{Binding LastError}" Width="*">
+                                        <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="LastError" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Last Error" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                    </DataGridTextColumn>
+                                </DataGrid.Columns>
+                            </DataGrid>
+                        </TabItem>
+                        <TabItem Header="Collection Log">
+                            <Grid>
+                                <Grid.RowDefinitions>
+                                    <RowDefinition Height="Auto"/>
+                                    <RowDefinition Height="*"/>
+                                </Grid.RowDefinitions>
+                                <StackPanel Grid.Row="0" Orientation="Horizontal" Margin="0,4,0,8">
+                                    <Button Content="Open Log File" Click="OpenLogFile_Click" Padding="12,4" Margin="0,0,8,0"/>
+                                </StackPanel>
+                                <DataGrid Grid.Row="1" x:Name="CollectionLogGrid"
+                                          AutoGenerateColumns="False" IsReadOnly="True"
+                                          RowStyle="{StaticResource GridRowStyle}"
+                                          HeadersVisibility="Column" GridLinesVisibility="Horizontal">
+                                    <DataGrid.Columns>
+                                        <DataGridTextColumn Binding="{Binding CollectionTimeFormatted}" Width="130">
+                                            <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="CollectionTimeFormatted" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Time" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                        </DataGridTextColumn>
+                                        <DataGridTextColumn Binding="{Binding CollectorName}" Width="180">
+                                            <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="CollectorName" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Collector" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                        </DataGridTextColumn>
+                                        <DataGridTextColumn Binding="{Binding Status}" Width="80">
+                                            <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="Status" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Status" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                        </DataGridTextColumn>
+                                        <DataGridTextColumn Binding="{Binding DurationFormatted}" Width="90">
+                                            <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="DurationFormatted" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Duration" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                        </DataGridTextColumn>
+                                        <DataGridTextColumn Binding="{Binding SqlDurationFormatted}" Width="90">
+                                            <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="SqlDurationFormatted" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="SQL (ms)" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                        </DataGridTextColumn>
+                                        <DataGridTextColumn Binding="{Binding DuckDbDurationFormatted}" Width="100">
+                                            <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="DuckDbDurationFormatted" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="DuckDB (ms)" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                        </DataGridTextColumn>
+                                        <DataGridTextColumn Binding="{Binding RowsCollected, StringFormat=N0}" Width="80">
+                                            <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="RowsCollected" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Rows" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                        </DataGridTextColumn>
+                                        <DataGridTextColumn Binding="{Binding ErrorMessage}" Width="*">
+                                            <DataGridTextColumn.Header><StackPanel Orientation="Horizontal"><Button Style="{DynamicResource ColumnFilterButtonStyle}" Tag="ErrorMessage" Click="FilterButton_Click" Margin="0,0,4,0"/><TextBlock Text="Error" FontWeight="Bold" VerticalAlignment="Center"/></StackPanel></DataGridTextColumn.Header>
+                                        </DataGridTextColumn>
+                                    </DataGrid.Columns>
+                                </DataGrid>
+                            </Grid>
+                        </TabItem>
+                        <TabItem Header="Duration Trends">
+                            <ScottPlot:WpfPlot x:Name="CollectorDurationChart" Margin="4"/>
+                        </TabItem>
+                    </TabControl>
                 </Grid>
             </TabItem>
 
diff --git a/Lite/Controls/ServerTab.xaml.cs b/Lite/Controls/ServerTab.xaml.cs
index f89a517b..4e30cdae 100644
--- a/Lite/Controls/ServerTab.xaml.cs
+++ b/Lite/Controls/ServerTab.xaml.cs
@@ -59,6 +59,7 @@ public partial class ServerTab : UserControl
     private DataGridFilterManager<DatabaseScopedConfigRow>? _dbScopedConfigFilterMgr;
     private DataGridFilterManager<TraceFlagRow>? _traceFlagsFilterMgr;
     private DataGridFilterManager<CollectorHealthRow>? _collectionHealthFilterMgr;
+    private DataGridFilterManager<CollectionLogRow>? _collectionLogFilterMgr;
 
     private static readonly HashSet<string> _defaultPerfmonCounters = new(StringComparer.OrdinalIgnoreCase)
     {
@@ -446,6 +447,7 @@ private async System.Threading.Tasks.Task RefreshAllDataAsync()
             var traceFlagsTask = SafeQueryAsync(() => _dataService.GetLatestTraceFlagsAsync(_serverId));
             var runningJobsTask = SafeQueryAsync(() => _dataService.GetRunningJobsAsync(_serverId));
             var collectionHealthTask = SafeQueryAsync(() => _dataService.GetCollectionHealthAsync(_serverId));
+            var collectionLogTask = SafeQueryAsync(() => _dataService.GetRecentCollectionLogAsync(_serverId, hoursBack));
             /* Core data tasks */
             await System.Threading.Tasks.Task.WhenAll(
                 snapshotsTask, cpuTask, memoryTask, memoryTrendTask,
@@ -453,7 +455,7 @@ await System.Threading.Tasks.Task.WhenAll(
                 deadlockTask, blockedProcessTask, waitTypesTask, perfmonCountersTask,
                 queryStoreTask, memoryGrantTrendTask,
                 serverConfigTask, databaseConfigTask, databaseScopedConfigTask, traceFlagsTask,
-                runningJobsTask, collectionHealthTask);
+                runningJobsTask, collectionHealthTask, collectionLogTask);
 
             /* Trend chart tasks - run separately so failures don't kill the whole refresh */
             var blockingTrendTask = SafeQueryAsync(() => _dataService.GetBlockingTrendAsync(_serverId, hoursBack, fromDate, toDate));
@@ -491,6 +493,8 @@ await System.Threading.Tasks.Task.WhenAll(
             _traceFlagsFilterMgr!.UpdateData(traceFlagsTask.Result);
             _runningJobsFilterMgr!.UpdateData(runningJobsTask.Result);
             _collectionHealthFilterMgr!.UpdateData(collectionHealthTask.Result);
+            _collectionLogFilterMgr!.UpdateData(collectionLogTask.Result);
+            UpdateCollectorDurationChart(collectionLogTask.Result);
 
             /* Update memory summary */
             UpdateMemorySummary(memoryTask.Result);
@@ -1844,6 +1848,62 @@ private static string CsvEscape(string value)
         return value;
     }
 
+    /* ========== Collection Health ========== */
+
+    private void UpdateCollectorDurationChart(List<CollectionLogRow> data)
+    {
+        ClearChart(CollectorDurationChart);
+        ApplyDarkTheme(CollectorDurationChart);
+
+        if (data.Count == 0) { CollectorDurationChart.Refresh(); return; }
+
+        /* Group by collector, plot each as a separate series */
+        var groups = data
+            .Where(d => d.DurationMs.HasValue && d.Status == "SUCCESS")
+            .GroupBy(d => d.CollectorName)
+            .OrderBy(g => g.Key)
+            .ToList();
+
+        int colorIdx = 0;
+        foreach (var group in groups)
+        {
+            var points = group.OrderBy(d => d.CollectionTime).ToList();
+            if (points.Count < 2) continue;
+
+            var times = points.Select(d => d.CollectionTime.ToLocalTime().ToOADate()).ToArray();
+            var durations = points.Select(d => (double)d.DurationMs!.Value).ToArray();
+
+            var scatter = CollectorDurationChart.Plot.Add.Scatter(times, durations);
+            scatter.LegendText = group.Key;
+            scatter.Color = ScottPlot.Color.FromHex(SeriesColors[colorIdx % SeriesColors.Length]);
+            scatter.LineWidth = 2;
+            scatter.MarkerSize = 0;
+            colorIdx++;
+        }
+
+        CollectorDurationChart.Plot.Axes.DateTimeTicksBottom();
+        ReapplyAxisColors(CollectorDurationChart);
+        CollectorDurationChart.Plot.YLabel("Duration (ms)");
+        CollectorDurationChart.Plot.Axes.AutoScale();
+        ShowChartLegend(CollectorDurationChart);
+        CollectorDurationChart.Refresh();
+    }
+
+    private void OpenLogFile_Click(object sender, RoutedEventArgs e)
+    {
+        var logDir = System.IO.Path.Combine(AppContext.BaseDirectory, "logs");
+        var logFile = System.IO.Path.Combine(logDir, $"lite_{DateTime.Now:yyyyMMdd}.log");
+
+        if (File.Exists(logFile))
+        {
+            Process.Start(new ProcessStartInfo(logFile) { UseShellExecute = true });
+        }
+        else if (Directory.Exists(logDir))
+        {
+            Process.Start(new ProcessStartInfo(logDir) { UseShellExecute = true });
+        }
+    }
+
     /// <summary>
     /// Stops the refresh timer when the tab is removed.
     /// </summary>
@@ -1868,6 +1928,7 @@ private void InitializeFilterManagers()
         _dbScopedConfigFilterMgr = new DataGridFilterManager<DatabaseScopedConfigRow>(DatabaseScopedConfigGrid);
         _traceFlagsFilterMgr = new DataGridFilterManager<TraceFlagRow>(TraceFlagsGrid);
         _collectionHealthFilterMgr = new DataGridFilterManager<CollectorHealthRow>(CollectionHealthGrid);
+        _collectionLogFilterMgr = new DataGridFilterManager<CollectionLogRow>(CollectionLogGrid);
 
         _filterManagers[QuerySnapshotsGrid] = _querySnapshotsFilterMgr;
         _filterManagers[QueryStatsGrid] = _queryStatsFilterMgr;
@@ -1881,6 +1942,7 @@ private void InitializeFilterManagers()
         _filterManagers[DatabaseScopedConfigGrid] = _dbScopedConfigFilterMgr;
         _filterManagers[TraceFlagsGrid] = _traceFlagsFilterMgr;
         _filterManagers[CollectionHealthGrid] = _collectionHealthFilterMgr;
+        _filterManagers[CollectionLogGrid] = _collectionLogFilterMgr;
     }
 
     private void EnsureFilterPopup()
diff --git a/Lite/Services/LocalDataService.CollectionHealth.cs b/Lite/Services/LocalDataService.CollectionHealth.cs
index 5ba3a7a3..254710fd 100644
--- a/Lite/Services/LocalDataService.CollectionHealth.cs
+++ b/Lite/Services/LocalDataService.CollectionHealth.cs
@@ -61,6 +61,74 @@ GROUP BY collector_name
         return items;
     }
 
+    /// <summary>
+    /// Gets recent collection log entries for a server, most recent first.
+    /// </summary>
+    public async Task<List<CollectionLogRow>> GetRecentCollectionLogAsync(int serverId, int hoursBack = 4, int maxRows = 500)
+    {
+        using var connection = await OpenConnectionAsync();
+        using var command = connection.CreateCommand();
+        command.CommandText = @"
+SELECT
+    collector_name,
+    collection_time,
+    duration_ms,
+    sql_duration_ms,
+    duckdb_duration_ms,
+    rows_collected,
+    status,
+    error_message
+FROM collection_log
+WHERE server_id = $1
+AND   collection_time >= $2
+ORDER BY collection_time DESC
+LIMIT $3";
+
+        command.Parameters.Add(new DuckDBParameter { Value = serverId });
+        command.Parameters.Add(new DuckDBParameter { Value = DateTime.UtcNow.AddHours(-hoursBack) });
+        command.Parameters.Add(new DuckDBParameter { Value = maxRows });
+
+        var items = new List<CollectionLogRow>();
+        using var reader = await command.ExecuteReaderAsync();
+        while (await reader.ReadAsync())
+        {
+            items.Add(new CollectionLogRow
+            {
+                CollectorName = reader.GetString(0),
+                CollectionTime = reader.GetDateTime(1),
+                DurationMs = reader.IsDBNull(2) ? null : (int?)Convert.ToInt32(reader.GetValue(2)),
+                SqlDurationMs = reader.IsDBNull(3) ? null : (int?)Convert.ToInt32(reader.GetValue(3)),
+                DuckDbDurationMs = reader.IsDBNull(4) ? null : (int?)Convert.ToInt32(reader.GetValue(4)),
+                RowsCollected = reader.IsDBNull(5) ? null : (int?)Convert.ToInt32(reader.GetValue(5)),
+                Status = reader.GetString(6),
+                ErrorMessage = reader.IsDBNull(7) ? null : reader.GetString(7)
+            });
+        }
+
+        return items;
+    }
+}
+
+public class CollectionLogRow
+{
+    public string CollectorName { get; set; } = "";
+    public DateTime CollectionTime { get; set; }
+    public int? DurationMs { get; set; }
+    public int? SqlDurationMs { get; set; }
+    public int? DuckDbDurationMs { get; set; }
+    public int? RowsCollected { get; set; }
+    public string Status { get; set; } = "";
+    public string? ErrorMessage { get; set; }
+
+    public string CollectionTimeFormatted => CollectionTime.ToLocalTime().ToString("MM/dd HH:mm:ss");
+
+    public string DurationFormatted => DurationMs.HasValue
+        ? (DurationMs.Value < 1000 ? $"{DurationMs.Value} ms" : $"{DurationMs.Value / 1000.0:F1} s")
+        : "";
+
+    public string SqlDurationFormatted => SqlDurationMs.HasValue ? $"{SqlDurationMs.Value} ms" : "";
+
+    public string DuckDbDurationFormatted => DuckDbDurationMs.HasValue ? $"{DuckDbDurationMs.Value} ms" : "";
 }
 
 public class CollectorHealthRow