Public rank change log: sa_rank_log, written on rank changes, listed on the Staff page

sql/rank-log.sql

@@ -0,0 +1,27 @@
+-- Rank history: one row each time a player's rank (their highest-immunity SimpleAdmin group)
+-- changes, for the public promotions/demotions list.
+--
+-- The panel creates this table itself at startup (it's embedded in the binary), so running it by
+-- hand is only needed if the panel's database user can't CREATE TABLE. Written by the panel for
+-- changes made there, and by our SimpleAdmin fork (1.8.2b-zio10+) for css_addadmin/css_deladmin
+-- 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.
+
+CREATE TABLE IF NOT EXISTS `sa_rank_log` (
+    `id` int(11) NOT NULL AUTO_INCREMENT,
+    `player_steamid` bigint(20) NOT NULL,
+    `player_name` varchar(128) NOT NULL DEFAULT '',
+    `old_rank` varchar(64) NULL,
+    `new_rank` varchar(64) NULL,
+    `kind` varchar(16) NOT NULL,
+    `admin_steamid` bigint(20) NOT NULL DEFAULT 0,
+    `admin_name` varchar(128) NOT NULL DEFAULT '',
+    `source` varchar(16) NOT NULL,
+    `created` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (`id`),
+    KEY `idx_rank_log_created` (`created`),
+    KEY `idx_rank_log_player` (`player_steamid`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;