SQL Database 'Project_Content' on SQL Server instance 'XXX' not found - after removing project server

I keep getting this error in event viewer. I reckon project server was installed before on the farm and it has been removed but it seems its still looking for the content database see error below

SQL Database 'Project_Content' on SQL Server instance 'XXX' not found. 
Additional error information from SQL Server is included below.

Cannot open database "Project_Content" requested by the login. The login failed.
Login failed for user XXX\xx.farm'.

How can i stop this and where can i inform the SP farm that it doesn't exist anymore. Thanks in Advance