Problem importing service dependencies from SQL via Director

I have created a simple sql import that pulls in few columns from db and tries to create service dependencies from it. I am stuck on a rather cryptic error messsage that won’t let me go on.

This Sync Rule failed when last checked at 2020-04-30 14:11:58+02: Exception while syncing Icinga\Module\Director\Objects\IcingaDependency director_dep_cc_director_dev-ceidg_dev-ceidg availability_dev-ceidg isDataBaseAccessible: Failed to load icinga_host "0"

I have mapped all the necessary fields for dependency in director (parent_host, parent_service, child_host, child_service), and i am hitting this error. The host column is not null, and refers to a host defined in Director. Any hints?