| Warning Always back up your data before performing any data operation. See Export Backup Data from Salesforce or Export Data for more details. It is recommended to run a test with a small subset of records to ensure the operation was successful through manually opening and verifying that the corresponding records are correct in Salesforce. |
For record deletion refer to Find out who deleted a record in Salesforce and Recover records and data in Salesforce.
Tracking down these types of changes can only be done client-side or internally by customers through:
If the behavior is still occurring, and specific field values are changing unexpectedly, an Admin can setup and configure Field History Tracking or Feed Tracking to identify who and when the unexpected field changes are being made.
If unknown API login attempts are present, it may helpful to use the login's source IP to perform a 'WhoIs' lookup via the 'Whois-RWS' on the American Registry of Internet Numbers Site search feature. This will typically provide organization details for the reported owner of the IP address from which the unknown login is occurring.
Common features that have been known to potentially cause seemingly unexpected updates to Activity (Task and Event) records include:
It's recommend an administrator remove the affected user from said application(s) or configuration(s) on a temporary basis and ask the user to monitor and see if unexpected updates continue to occur. If change are no longer occurring systematically, reintroduce each application area individually to identify which is contributing to the unexpected changes. If this is not possible in production, consider using a sandbox to test with this troubleshooting method.
See Also :
Data Recovery Retirement
Unable to restore a deleted record from the Recycle Bin
000381832

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