diff --git a/containers/backupchecks/src/backend/app/parsers/registry.py b/containers/backupchecks/src/backend/app/parsers/registry.py
index b2fc100..1ea80b4 100644
--- a/containers/backupchecks/src/backend/app/parsers/registry.py
+++ b/containers/backupchecks/src/backend/app/parsers/registry.py
@@ -50,13 +50,13 @@ PARSER_DEFINITIONS = [
         },
         "description": "Parses NTFS Auditing file audit report mails (attachment-based HTML reports).",
         "example": {
-            "subject": "Bouter btr-dc001.bouter.nl file audits → 6 ↑ 12",
-            "from_address": "auditing@bouter.nl",
+            "subject": "SERVER-HOSTNAME file audits → 6 ↑ 12",
+            "from_address": "auditing@example.local",
             "body_snippet": "(empty body, HTML report in attachment)",
             "parsed_result": {
                 "backup_software": "NTFS Auditing",
                 "backup_type": "Audit",
-                "job_name": "btr-dc001.bouter.nl file audits",
+                "job_name": "SERVER-HOSTNAME file audits",
                 "objects": [],
             },
         },
@@ -73,16 +73,42 @@ PARSER_DEFINITIONS = [
         },
         "description": "Parses QNAP Notification Center firmware update notifications (informational; excluded from reporting and missing logic).",
         "example": {
-            "subject": "[Info][Firmware Update] Notification from your device: BETSIES-NAS01",
+            "subject": "[Info][Firmware Update] Notification from your device: NAS-HOSTNAME",
             "from_address": "notifications@customer.tld",
-            "body_snippet": "NAS Name: BETSIES-NAS01\n...\nMessage: ...",
+            "body_snippet": "NAS Name: NAS-HOSTNAME\n...\nMessage: ...",
             "parsed_result": {
                 "backup_software": "QNAP",
                 "backup_type": "Firmware Update",
                 "job_name": "Firmware Update",
                 "overall_status": "Warning",
                 "objects": [
-                    {"name": "BETSIES-NAS01", "status": "Warning", "error_message": None}
+                    {"name": "NAS-HOSTNAME", "status": "Warning", "error_message": None}
+                ],
+            },
+        },
+    },
+    {
+        "name": "synology_dsm_update",
+        "backup_software": "Synology",
+        "backup_types": ["Updates"],
+        "order": 236,
+        "enabled": True,
+        "match": {
+            "subject_contains_any": ["DSM-update", "DSM update"],
+            "body_contains_any": ["automatische DSM-update", "automatic DSM update", "Automatic update of DSM"],
+        },
+        "description": "Parses Synology DSM automatic update cancelled notifications (informational; excluded from reporting and missing logic).",
+        "example": {
+            "subject": "Synology NAS-HOSTNAME - Automatische DSM-update op NAS-HOSTNAME is geannuleerd door het systeem",
+            "from_address": "backup@example.local",
+            "body_snippet": "Het systeem heeft de automatische DSM-update op NAS-HOSTNAME geannuleerd...",
+            "parsed_result": {
+                "backup_software": "Synology",
+                "backup_type": "Updates",
+                "job_name": "Synology Automatic Update",
+                "overall_status": "Warning",
+                "objects": [
+                    {"name": "NAS-HOSTNAME", "status": "Warning"}
                 ],
             },
         },
@@ -383,16 +409,16 @@ PARSER_DEFINITIONS = [
         },
         "description": "Parses NAKIVO Backup & Replication reports for VMware backup jobs.",
         "example": {
-            "subject": '"exchange01.kuiperbv.nl" job: Successful',
+            "subject": '"VM-HOSTNAME" job: Successful',
             "from_address": "NAKIVO Backup & Replication <administrator@customer.local>",
             "body_snippet": "Job Run Report... Backup job for VMware ... Successful",
             "parsed_result": {
                 "backup_software": "NAKIVO",
                 "backup_type": "Backup job for VMware",
-                "job_name": "exchange01.kuiperbv.nl",
+                "job_name": "VM-HOSTNAME",
                 "objects": [
                     {
-                        "name": "exchange01.kuiperbv.nl",
+                        "name": "VM-HOSTNAME",
                         "status": "Success",
                         "error_message": "",
                     }
diff --git a/docs/changelog-claude.md b/docs/changelog-claude.md
index 2bc0cab..f5eaf46 100644
--- a/docs/changelog-claude.md
+++ b/docs/changelog-claude.md
@@ -8,9 +8,11 @@ This file documents all changes made to this project via Claude Code.
 - 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)
 - Added "Generate test emails" feature in Settings → Maintenance with three separate buttons to create fixed test email sets (success/warning/error) in inbox for testing parsers and maintenance operations (each set contains exactly 3 Veeam Backup Job emails with the same job name "Test-Backup-Job" and different dates/objects/statuses for reproducible testing and proper status flow testing)
+- Added parser registry entry for Synology DSM automatic update cancelled notifications (backup software: Synology, backup type: Updates, informational only, no schedule learning)
 
 ### 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")
+- Replaced real customer names in parser registry examples with generic placeholders (NTFS Auditing, QNAP Firmware Update, NAKIVO) to prevent customer information in codebase
 
 ### Fixed
 - Fixed Autotask ticket description being set to NULL when resolving tickets via `update_ticket_resolution_safe` by adding "description" to the optional_fields list, ensuring the original description is preserved during PUT operations