We created a custom field called 'Parent Link' to create the hierarchy Initiative > Epic > Story and use Initiative as the parent. However, in the jiradb.customfieldvalue table, the 'custom field' of parent link does not exist for epics I know have a parent link to an initiative in the Jira UI.
What I want to know is, how does Jira link Epics to the custom field of 'Parent Link'?