psql to the db. Something like:
su - postgres
psql oacs-5-9
Then you can get the parameter_id:
oacs-5-9=# select * from apm_parameter_values where parameter_id in (select parameter_id from apm_parameters where parameter_name = 'SystemURL');
value_id | package_id | parameter_id | attr_value
----------+------------+--------------+------------------------------------
74 | 69 | 64 | http://localhost:8000
(1 row)