Recovering a database is not possible even though active users are no longer visible.
Product line
Standard
|Expert
Operating mode
CLOUD ABO
|ON-PREMISES
Modules
Services & CRM
Budget & Phases
Purchases
Resource Planning
Business Intelligence
If a database cannot be restored/overwritten because the database is in use, although no active users are visible, then the Vertec service may still be running.
Stop the Vertec service. Then you can restore/overwrite the database. Then restart the Vertec service.