Security labels:
SECLABLE.SET(conn, 'FUNCTION', func_name, provider, security_label, func_schema, func_args)
SECLABLE.UNSET(conn, 'FUNCTION', func_name, provider, func_schema, func_args)
Privileges:
PRIVILEGE.SET(conn, 'FUNCTION', grantee, func_name, privileges_without_grant, privileges_with_grant, func_schema, func_args)
PRIVILEGE.UNSETALL(conn, 'FUNCTION', grantee, func_name, func_schema, func_args)