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Overall, we don't recommend making changes to the SQL Backend. As you can imagine, this change is not as simple as changing the value of a single cell. If you really want to preserve the old displayID, please feel free to create a case with Tech Support.
A better solution is to change the URL links to use the display names instead of the DisplayIDs. Starting in Coresight 2015, we enable linking to Processbook Imports using the Display name. Here are some examples: PI Coresight - Opening an existing saved display. While this solution is tedious as you have many Processbook displays, this is the more robust solution as it will prevent issues like a change in DisplayID from occurring again.