erikdarlingdata
diff --git a/‎Installer.Core/DependencyInstaller.cs‎
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+/*
+ * Copyright (c) 2026 Erik Darling, Darling Data LLC
+ *
+ * This file is part of the SQL Server Performance Monitor.
+ *
+ * Licensed under the MIT License. See LICENSE file in the project root for full license information.
+ */
+
+using System.Diagnostics;
+using Installer.Core.Models;
+using Microsoft.Data.SqlClient;
+
+namespace Installer.Core;
+
+/// <summary>
+/// Installs community dependencies (sp_WhoIsActive, DarlingData, First Responder Kit)
+/// from GitHub. Requires an HttpClient — create one instance and dispose when done.
+/// </summary>
+public sealed class DependencyInstaller : IDisposable
+{
+    private readonly HttpClient _httpClient;
+    private bool _disposed;
+
+    public DependencyInstaller()
+    {
+        _httpClient = new HttpClient
+        {
+            Timeout = TimeSpan.FromSeconds(30)
+        };
+    }
+
+    /// <summary>
+    /// Install community dependencies from GitHub into the PerformanceMonitor database.
+    /// Returns the number of successfully installed dependencies.
+    /// </summary>
+    public async Task<int> InstallDependenciesAsync(
+        string connectionString,
+        IProgress<InstallationProgress>? progress = null,
+        CancellationToken cancellationToken = default)
+    {
+        var dependencies = new List<(string Name, string Url, string Description)>
+        {
+            (
+                "sp_WhoIsActive",
+                "https://raw.githubusercontent.com/amachanic/sp_whoisactive/refs/heads/master/sp_WhoIsActive.sql",
+                "Query activity monitoring by Adam Machanic (GPLv3)"
+            ),
+            (
+                "DarlingData",
+                "https://raw.githubusercontent.com/erikdarlingdata/DarlingData/main/Install-All/DarlingData.sql",
+                "sp_HealthParser, sp_HumanEventsBlockViewer by Erik Darling (MIT)"
+            ),
+            (
+                "First Responder Kit",
+                "https://raw.githubusercontent.com/BrentOzarULTD/SQL-Server-First-Responder-Kit/refs/heads/main/Install-All-Scripts.sql",
+                "sp_BlitzLock and diagnostic tools by Brent Ozar Unlimited (MIT)"
+            )
+        };
+
+        progress?.Report(new InstallationProgress
+        {
+            Message = "Installing community dependencies...",
+            Status = "Info"
+        });
+
+        int successCount = 0;
+
+        foreach (var (name, url, description) in dependencies)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            progress?.Report(new InstallationProgress
+            {
+                Message = $"Installing {name}...",
+                Status = "Info"
+            });
+
+            try
+            {
+                var depSw = Stopwatch.StartNew();
+                progress?.Report(new InstallationProgress { Message = $"[DEBUG] Downloading {name} from {url}", Status = "Debug" });
+                string sql = await DownloadWithRetryAsync(url, progress, cancellationToken: cancellationToken).ConfigureAwait(false);
+                progress?.Report(new InstallationProgress { Message = $"[DEBUG] {name}: downloaded {sql.Length} chars in {depSw.ElapsedMilliseconds}ms", Status = "Debug" });
+
+                if (string.IsNullOrWhiteSpace(sql))
+                {
+                    progress?.Report(new InstallationProgress
+                    {
+                        Message = $"{name} - FAILED (empty response)",
+                        Status = "Error"
+                    });
+                    continue;
+                }
+
+                using var connection = new SqlConnection(connectionString);
+                await connection.OpenAsync(cancellationToken).ConfigureAwait(false);
+
+                using (var useDbCommand = new SqlCommand("USE PerformanceMonitor;", connection))
+                {
+                    await useDbCommand.ExecuteNonQueryAsync(cancellationToken).ConfigureAwait(false);
+                }
+
+                string[] batches = Patterns.GoBatchSplitter.Split(sql);
+                int nonEmpty = batches.Count(b => !string.IsNullOrWhiteSpace(b));
+                progress?.Report(new InstallationProgress { Message = $"[DEBUG] {name}: executing {nonEmpty} batches", Status = "Debug" });
+
+                foreach (string batch in batches)
+                {
+                    string trimmedBatch = batch.Trim();
+                    if (string.IsNullOrWhiteSpace(trimmedBatch))
+                        continue;
+
+                    using var command = new SqlCommand(trimmedBatch, connection);
+                    command.CommandTimeout = InstallationService.DependencyTimeoutSeconds;
+                    await command.ExecuteNonQueryAsync(cancellationToken).ConfigureAwait(false);
+                }
+
+                progress?.Report(new InstallationProgress
+                {
+                    Message = $"{name} - Success ({description})",
+                    Status = "Success"
+                });
+
+                successCount++;
+            }
+            catch (HttpRequestException ex)
+            {
+                progress?.Report(new InstallationProgress
+                {
+                    Message = $"{name} - Download failed: {ex.Message}",
+                    Status = "Error"
+                });
+            }
+            catch (SqlException ex)
+            {
+                progress?.Report(new InstallationProgress
+                {
+                    Message = $"{name} - SQL execution failed: {ex.Message}",
+                    Status = "Error"
+                });
+            }
+            catch (Exception ex)
+            {
+                progress?.Report(new InstallationProgress
+                {
+                    Message = $"{name} - Failed: {ex.Message}",
+                    Status = "Error"
+                });
+            }
+        }
+
+        progress?.Report(new InstallationProgress
+        {
+            Message = $"Dependencies installed: {successCount}/{dependencies.Count}",
+            Status = successCount == dependencies.Count ? "Success" : "Warning"
+        });
+
+        return successCount;
+    }
+
+    private async Task<string> DownloadWithRetryAsync(
+        string url,
+        IProgress<InstallationProgress>? progress = null,
+        int maxRetries = 3,
+        CancellationToken cancellationToken = default)
+    {
+        for (int attempt = 1; attempt <= maxRetries; attempt++)
+        {
+            try
+            {
+                return await _httpClient.GetStringAsync(url, cancellationToken).ConfigureAwait(false);
+            }
+            catch (HttpRequestException) when (attempt < maxRetries)
+            {
+                int delaySeconds = (int)Math.Pow(2, attempt);
+                progress?.Report(new InstallationProgress
+                {
+                    Message = $"Network error, retrying in {delaySeconds}s ({attempt}/{maxRetries})...",
+                    Status = "Warning"
+                });
+                await Task.Delay(delaySeconds * 1000, cancellationToken).ConfigureAwait(false);
+            }
+        }
+        return await _httpClient.GetStringAsync(url, cancellationToken).ConfigureAwait(false);
+    }
+
+    public void Dispose()
+    {
+        if (!_disposed)
+        {
+            _httpClient?.Dispose();
+            _disposed = true;
+        }
+        GC.SuppressFinalize(this);
+    }
+}