Rank log: inactive ranks (Guardian) count as promotions to and from, demotion when lost; Guardian is staff

sql/rank-log.sql

@@ -7,8 +7,11 @@
 -- and the in-game admin menu. Nothing writes it for ranks that lapse when an admin's `ends` passes.
 --
 -- kind is added, removed, promoted, demoted (compared by group immunity) or changed (same
--- immunity). old_rank/new_rank are group names ("#rank/mod"), NULL for no rank. admin_steamid 0
--- is Console. created is a wall-clock value in SimpleAdmin's Timezone, like its other tables.
+-- immunity). The panel overrides it when listing changes involving an inactive rank (one marked
+-- "inactive" in its site config, like Guardian): moving between an inactive rank and any other
+-- rank shows as promoted either way, and losing an inactive rank shows as demoted. old_rank/new_rank are group names ("#rank/mod"), NULL for no
+-- rank. admin_steamid 0 is Console. created is a wall-clock value in SimpleAdmin's Timezone, like
+-- its other tables.
 
 CREATE TABLE IF NOT EXISTS `sa_rank_log` (
     `id` int(11) NOT NULL AUTO_INCREMENT,