The job templates are not stored in the WCC database. They are stored down in the WCC file structure. The directory location is...
Under this directory is a subdirectory for 'global' templates along with additional sub-directories for any user templates.
There is no automatic replication of the job templates between WCC servers that are in an HA configuration. The batch interface would need to be run on all WCC servers for them to be available across the HA environment.