Many databases, possibility to have different cron schémas?

We have several databases in the same Postgres instance and we would like to 'split' them across crondb schemas, instead of having them all in the 'cron' schema. We tried creating a cron_test schema in crondb and using select * from cron_test.schedule but it didn't work.

ERROR: function cron_test.schedule(unknown, unknown, unknown) does not exist
LINE 1: select cron_test.schedule('tester test schedule',' * * * * *...

Is there a quick and dirty work-around to this? We are doing to it 'secure' cron info between databases.