Add Veeam parser support for "Job did not start on schedule" error notifications

Extend Veeam parser to recognize and handle error notifications when a backup
job fails to start on its scheduled time. This commonly occurs when proxy
servers are offline or other infrastructure issues prevent job execution.

Features:
- Detects "Job did not start on schedule" pattern in subject line
- Extracts backup type from subject (e.g., "Veeam Backup for Microsoft 365")
- Extracts job name from subject after colon (e.g., "Backup MDS at Work")
- Reads error message from plain text body (handles base64 UTF-16 encoding)
- Sets overall_status to "Error" for failed-to-start jobs
- Example message: "Proxy server was offline at the time the job was scheduled to run."

This handles VBO365 and other Veeam backup types that send plain text error
notifications instead of the usual HTML formatted reports.

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

containers/backupchecks/src/backend/app/parsers/veeam.py

@@ -1177,6 +1177,38 @@ def try_parse_veeam(msg: MailMessage) -> Tuple[bool, Dict, List[Dict]]:
         }
         return True, result, []
 
+    # Job did not start on schedule: special error notification (no objects, plain text body).
+    # Example subject: "[Veeam Backup for Microsoft 365] Job did not start on schedule: Backup MDS at Work"
+    subject_lower = subject.lower()
+    if 'job did not start on schedule' in subject_lower:
+        # Extract backup type from subject (e.g., "Veeam Backup for Microsoft 365")
+        backup_type = None
+        for candidate in VEEAM_BACKUP_TYPES:
+            if candidate.lower() in subject_lower:
+                backup_type = candidate
+                break
+        if not backup_type:
+            backup_type = "Backup Job"
+
+        # Extract job name after the colon (e.g., "Backup MDS at Work")
+        job_name = None
+        m_job = re.search(r'job did not start on schedule:\s*(.+)$', subject, re.IGNORECASE)
+        if m_job:
+            job_name = (m_job.group(1) or '').strip()
+
+        # Get overall message from text_body (can be base64 encoded)
+        text_body = (getattr(msg, 'text_body', None) or '').strip()
+        overall_message = text_body if text_body else 'Job did not start on schedule'
+
+        result = {
+            'backup_software': 'Veeam',
+            'backup_type': backup_type,
+            'job_name': job_name or 'Unknown Job',
+            'overall_status': 'Error',
+            'overall_message': overall_message,
+        }
+        return True, result, []
+
     # Configuration Job detection (may not have object details)
     subj_lower = subject.lower()
     is_config_job = ('backup configuration job' in subj_lower) or ('configuration backup for' in html_lower)

docs/changelog-claude.md

@@ -5,6 +5,7 @@ This file documents all changes made to this project via Claude Code.
 ## [2026-02-09]
 
 ### Added
+- Extended Veeam parser to recognize "Job did not start on schedule" error notifications for Veeam Backup for Microsoft 365 (and other Veeam backup types) with job name extraction from subject and error message from plain text body (proxy server offline, scheduled run failed)
 - Added parser for Synology monthly drive health reports (backup software: Synology, backup type: Health Report, job name: Monthly Drive Health, informational only, no schedule learning) with support for both Dutch and English notifications ("schijfintegriteitsrapport"/"Drive Health Report") and automatic status detection (Healthy/Gezond → Success, problems → Warning)
 - 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)