Depending on the Confluence version, you can also check for the Internal system administrator with the following query (for 5.7.x, in this example, but, it could be applied for other versions):
select u.id, u.user_name, u.active from cwd_user u join cwd_membership m on u.id=m.child_user_id join cwd_group g on m.parent_id=g.id join cwd_directory d on d.id=g.directory_id where g.group_name = 'confluence-administrators' and d.directory_name='Confluence Internal Directory';
Also, this doc have some queries and examples on how to retrieve the administrators of the instance. Another option could be to look into the users in the *confluence-administrators* group, in case of having access to it.
Hope it helps you, sir.
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