Important: #110515 - Enforce unique dashboard identifiers 

Description 

Dashboard identifiers are now generated randomly and protected by a unique database index. An additional index improves dashboard lookups by owner.

Existing installations may contain duplicate dashboard identifiers. The database analyzer retains the non-unique identifier index while duplicates exist, allowing the initial schema update to complete without a uniqueness violation.

Run the upgrade wizard Make dashboard identifiers unique to replace duplicate identifiers, including those of deleted, hidden and scheduled dashboards. The first record of each group keeps its identifier. Dashboard titles, owners and widget configuration are preserved.

After running the wizard, run the database analyzer again to apply the unique identifier index. Fresh installations create the unique index immediately.