Snapshot data logging is the only database that allows users to read and update old values.
First, from the Database builder, enable the Snapshot logging for the desired points.
The Snapshot read and write functions are only accessible from the Automation Snapshot function blocks.
Use the automation function block for snapshot logging to write a set of points with a specific time (in the past) to the Sinolta Historian database.
Using a snapshot custom view, you can view or edit stored data. Furthermore, you can add a comment for every cell value that you changed.
Sinolta Snapshot Audit Trail prebuilt view allows you to see the history of changes, username for the users that change the values and any comments that they may have added.