Add queue hardening by modifying DeploymentJobTargets, DeploymentJobSteps, and DeploymentJobs tables

- Drop existing indexes on DeploymentJobTargets and DeploymentJobSteps
- Alter Status column to nvarchar(450) in DeploymentJobTargets, DeploymentJobSteps, and DeploymentJobs
- Add new columns: Finished, OutputMetadataJson, Started to DeploymentJobTargets; ErrorMessage, Finished, OutputMetadataJson, Started to DeploymentJobSteps; CorrelationId, HeartbeatAt, Priority, RowVersion, ScheduledAt, WorkerName to DeploymentJobs
- Create new indexes for improved query performance
- Add constraints to ensure OutputMetadataJson is valid JSON
- Record migration in __EFMigrationsHistory

.tests/Compare-BgwMergeWithApi.ps1

@@ -0,0 +1,42 @@
+[CmdletBinding()]
+param(
+    [string]$ApiBaseUrl = 'http://localhost:5286/api',
+
+    [string]$BgwRoot = ('F:\Kunden Auftr' + [char]0x00E4 + 'ge\BGW'),
+
+    [string]$DeploymentBatchId = '80000000-0000-0000-0000-000000000101',
+
+    [string]$MergeModulePath = 'F:\Projekte\Coding\PowerShell\Merge-DSCConfigurationData\Merge-DSCConfigurationData.psd1',
+
+    [string]$ResolveModulePath = 'F:\Projekte\Coding\PowerShell\Resolve-DSCConfigurationData\Resolve-DSCConfigurationData.psd1',
+
+    [int]$ApiTimeoutSec = 30,
+
+    [switch]$UseDefaultCredentials = $true
+)
+
+$ErrorActionPreference = 'Stop'
+
+$testPath = Join-Path -Path $PSScriptRoot -ChildPath 'BgwMerge.Api.Tests.ps1'
+if (-not (Test-Path -LiteralPath $testPath -PathType Leaf)) {
+    throw "Pester test file [$testPath] was not found."
+}
+
+if (-not (Get-Command Invoke-Pester -ErrorAction SilentlyContinue)) {
+    throw 'Pester is required. Install-Module Pester or run this on a machine where Pester is available.'
+}
+
+$parameters = @{
+    ApiBaseUrl = $ApiBaseUrl
+    BgwRoot = $BgwRoot
+    DeploymentBatchId = $DeploymentBatchId
+    MergeModulePath = $MergeModulePath
+    ResolveModulePath = $ResolveModulePath
+    ApiTimeoutSec = $ApiTimeoutSec
+    UseDefaultCredentials = [bool]$UseDefaultCredentials
+}
+
+$result = Invoke-Pester -Script @{ Path = $testPath; Parameters = $parameters } -PassThru
+if ($result.FailedCount -gt 0) {
+    throw "Pester test run failed. Passed=[$($result.PassedCount)] Failed=[$($result.FailedCount)] Skipped=[$($result.SkippedCount)]."
+}