Add preview page for orphaned jobs before deletion

Added verification step before deleting orphaned jobs:
- New GET endpoint /settings/jobs/orphaned to preview the list
- Shows detailed table with job name, backup software/type, customer ID,
  run count, and email count
- "Preview orphaned jobs" button on maintenance page
- Delete button on preview page shows exact count
- Summary shows total jobs, runs, and emails to be deleted

This allows admins to verify which jobs will be deleted before
taking the destructive action.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

containers/backupchecks/src/backend/app/main/routes_settings.py

@@ -124,6 +124,41 @@ def settings_jobs_delete_all():
     return redirect(url_for("main.settings"))
 
 
+@main_bp.route("/settings/jobs/orphaned", methods=["GET"])
+@login_required
+@roles_required("admin")
+def settings_jobs_orphaned():
+    """Show list of orphaned jobs for verification before deletion."""
+    # Find jobs without valid customer
+    orphaned_jobs = Job.query.outerjoin(Customer, Job.customer_id == Customer.id).filter(
+        db.or_(
+            Job.customer_id.is_(None),
+            Customer.id.is_(None)
+        )
+    ).order_by(Job.job_name.asc()).all()
+
+    # Build list with details
+    jobs_list = []
+    for job in orphaned_jobs:
+        run_count = JobRun.query.filter_by(job_id=job.id).count()
+        mail_count = JobRun.query.filter_by(job_id=job.id).filter(JobRun.mail_message_id.isnot(None)).count()
+
+        jobs_list.append({
+            "id": job.id,
+            "job_name": job.job_name or "Unnamed",
+            "backup_software": job.backup_software or "-",
+            "backup_type": job.backup_type or "-",
+            "customer_id": job.customer_id,
+            "run_count": run_count,
+            "mail_count": mail_count,
+        })
+
+    return render_template(
+        "main/settings_orphaned_jobs.html",
+        orphaned_jobs=jobs_list,
+    )
+
+
 @main_bp.route("/settings/jobs/delete-orphaned", methods=["POST"])
 @login_required
 @roles_required("admin")

containers/backupchecks/src/templates/main/settings.html

@@ -554,9 +554,12 @@
       <div class="card-header bg-warning">Cleanup orphaned jobs</div>
       <div class="card-body">
         <p class="mb-3">Delete jobs that are no longer linked to an existing customer. Related emails and runs will be <strong>permanently deleted</strong> from the database.</p>
-        <form method="post" action="{{ url_for('main.settings_jobs_delete_orphaned') }}" onsubmit="return confirm('Delete orphaned jobs and their emails? This cannot be undone.');">
-          <button type="submit" class="btn btn-warning">Delete orphaned jobs</button>
-        </form>
+        <div class="d-flex gap-2">
+          <a href="{{ url_for('main.settings_jobs_orphaned') }}" class="btn btn-outline-warning">Preview orphaned jobs</a>
+          <form method="post" action="{{ url_for('main.settings_jobs_delete_orphaned') }}" onsubmit="return confirm('Delete orphaned jobs and their emails? This cannot be undone.');" class="d-inline">
+            <button type="submit" class="btn btn-warning">Delete orphaned jobs</button>
+          </form>
+        </div>
       </div>
     </div>
   </div>

containers/backupchecks/src/templates/main/settings_orphaned_jobs.html

@@ -0,0 +1,87 @@
+{% extends "layout/base.html" %}
+
+{% block title %}Orphaned Jobs Preview{% endblock %}
+
+{% block content %}
+<div class="container-fluid py-4">
+  <div class="d-flex justify-content-between align-items-center mb-4">
+    <div>
+      <h2>Orphaned Jobs Preview</h2>
+      <p class="text-muted mb-0">Jobs without a valid customer link</p>
+    </div>
+    <a href="{{ url_for('main.settings', section='maintenance') }}" class="btn btn-outline-secondary">Back to Settings</a>
+  </div>
+
+  {% if orphaned_jobs %}
+  <div class="alert alert-warning">
+    <strong>⚠️ Warning:</strong> Found {{ orphaned_jobs|length }} orphaned job(s). Review the list below before deleting.
+  </div>
+
+  <div class="card mb-4">
+    <div class="card-header d-flex justify-content-between align-items-center">
+      <span>Orphaned Jobs List</span>
+      <form method="post" action="{{ url_for('main.settings_jobs_delete_orphaned') }}" onsubmit="return confirm('Delete all {{ orphaned_jobs|length }} orphaned jobs and their emails? This cannot be undone.');">
+        <button type="submit" class="btn btn-sm btn-danger">Delete All ({{ orphaned_jobs|length }} jobs)</button>
+      </form>
+    </div>
+    <div class="card-body p-0">
+      <div class="table-responsive">
+        <table class="table table-hover mb-0">
+          <thead>
+            <tr>
+              <th>Job Name</th>
+              <th>Backup Software</th>
+              <th>Backup Type</th>
+              <th>Customer ID</th>
+              <th class="text-end">Runs</th>
+              <th class="text-end">Emails</th>
+            </tr>
+          </thead>
+          <tbody>
+            {% for job in orphaned_jobs %}
+            <tr>
+              <td>{{ job.job_name }}</td>
+              <td>{{ job.backup_software }}</td>
+              <td>{{ job.backup_type }}</td>
+              <td>
+                {% if job.customer_id %}
+                  <span class="badge bg-danger">{{ job.customer_id }} (deleted)</span>
+                {% else %}
+                  <span class="badge bg-secondary">NULL</span>
+                {% endif %}
+              </td>
+              <td class="text-end">{{ job.run_count }}</td>
+              <td class="text-end">{{ job.mail_count }}</td>
+            </tr>
+            {% endfor %}
+          </tbody>
+          <tfoot>
+            <tr class="table-light">
+              <td colspan="4"><strong>Total</strong></td>
+              <td class="text-end"><strong>{{ orphaned_jobs|sum(attribute='run_count') }}</strong></td>
+              <td class="text-end"><strong>{{ orphaned_jobs|sum(attribute='mail_count') }}</strong></td>
+            </tr>
+          </tfoot>
+        </table>
+      </div>
+    </div>
+  </div>
+
+  <div class="alert alert-info">
+    <strong>ℹ️ What will be deleted:</strong>
+    <ul class="mb-0">
+      <li>{{ orphaned_jobs|length }} job(s)</li>
+      <li>{{ orphaned_jobs|sum(attribute='run_count') }} job run(s)</li>
+      <li>{{ orphaned_jobs|sum(attribute='mail_count') }} email(s)</li>
+      <li>All related data (backup objects, ticket/remark links, scopes, overrides)</li>
+    </ul>
+  </div>
+
+  {% else %}
+  <div class="alert alert-success">
+    <strong>✅ No orphaned jobs found.</strong>
+    <p class="mb-0">All jobs are properly linked to existing customers.</p>
+  </div>
+  {% endif %}
+</div>
+{% endblock %}

docs/changelog-claude.md

@@ -6,6 +6,7 @@ This file documents all changes made to this project via Claude Code.
 
 ### Added
 - Added "Cleanup orphaned jobs" maintenance option in Settings → Maintenance to delete jobs without valid customer links and their associated emails/runs permanently from database (useful when customers are removed)
+- Added "Preview orphaned jobs" button to show detailed list of jobs to be deleted with run/email counts before confirming deletion (verification step for safety)
 
 ### Changed
 - Removed customer name from Autotask ticket title to keep titles concise (format changed from "[Backupchecks] Customer - Job Name - Status" to "[Backupchecks] Job Name - Status")