Service Maps in Dev resetting after midnight – how to identify root cause?

[sadif_raja]

Hi Community,

We’re facing an issue in our Dev instance where Service Maps are being reset after midnight.

• Every morning, the maps created the previous day are gone.

• This started happening only a few days ago.

• I already checked Scheduled Jobs, Discovery Schedules, and Business Rules — nothing is running at that time.

• I also tried looking at sys_audit and syslog around midnight, but no clear deletes/updates were logged.

Questions:

1. Has anyone seen Service Maps being wiped/reset automatically in Dev before?

2. Could this be related to an instance refresh or cleanup policy?

3. Is there any specific Service Mapping setting, job, or plugin update that can cause this behavior?

4. What’s the best way to trace which process is deleting/resetting maps at midnight?

Any insights or pointers would be really helpful.

Thanks! 

[Umanjali]

Hi @sadif_raja 
1. We have a concept in ServiceNow called Data Management Delete Jobs (sys_dm_delete) that allow scheduled bulk deletions. These jobs can be configured to run at specific times (e.g., midnight) and may not show up in standard Scheduled Jobs or sys_trigger unless you inspect the sys_dm_delete table directly.
Please check in sys_dm_delete table.
https://www.servicenow.com/docs/bundle/zurich-platform-administration/page/administer/managing-data/...
2. If your Service Maps table is Audited, Use the Deleted Records Module. Go to Deleted Records (sys_audit_delete) to see if Service Maps or related CIs were deleted

[sadif_raja]

Check these as well but didn't found anything there related to our table.

[Mannapuram]

@sadif_raja What maps are getting erased? like these Service mappings were done using Tag-based or were Top-down Discovered ones? Did you check if there is any link to the CIs associated with these maps? are the CI's are getting erased as well?

[sadif_raja]

No CI's are there in the table, only maps are wiped out and it's only happening since 25 Aug 2025 and before this date all maps are still there. Not confirm the exact type, but I think it's Top-Down.