Database installer fails wth the error "The specified @job_id does not exist."
Excerpt from Database scriptor log might yield the below:
Verify that the SQL Server Agent service is running on the server. The scheduled jobs installed by AirWatch are recreated with each upgrade. Sometimes these jobs were created using an account with sysadmin privileges. If this is the case you must connect to the AirWatch database using an account with sysadmin privileges to modify or remove these jobs. Run the Database installer again and connect to the database with an account that has sysadmin access.