Implement the SERVADMIN command
Send services server info on load to ensure remote servers get the info regardless of whether they connect before or after db_services is loaded
Send service admins to new servers
Save admins sent to leaf servers
Propagate account IDs of logged in users to leafs
Clean up saved account IDs and admins on netsplit

The way db_services_leaf is set up lets me take a more agnostic approach to admins
Allow checking admin status in db_services_leaf
Make all privileged commands check for all service admins instead of just opers