optimized log modification recording

bin/dbsv-update.php

@@ -717,6 +717,16 @@ function dbv_144()   // add log versioning to allow log vandalism restore
 		}
 	}
 
+	function dbv_145()   // optimize log change recording
+	{
+		sql("ALTER TABLE `cache_logs_modified` DROP INDEX `id`,
+		     ADD UNIQUE INDEX `id` (`id`, `modify_date`)");
+		sql("ALTER TABLE `cache_logs_modified` MODIFY `modify_date` date default NULL");
+			// This may produce an error for duplicate dates.
+			// You may just delete the old `cache_logs_modified` contents
+			// (the feature was started just a few days befor this change).
+	}
+
 
 	// When adding new mutations, take care that they behave well if run multiple
 	// times. This improves robustness of database versioning.

htdocs/doc/sql/stored-proc/maintain-current.inc.php

@@ -1124,7 +1124,7 @@
 								 * optimize storage space by ignoring quick-corrections of logs
 								 */
 								IF DATEDIFF(NOW(), OLD.`date_created`) > 1 THEN
-									INSERT INTO `cache_logs_modified`
+									INSERT IGNORE INTO `cache_logs_modified`
 										(`id`, `uuid`, `node`, `date_created`, `last_modified`, `log_last_modified`,
 										 `cache_id`, `user_id`, `type`, `oc_team_comment`, `date`,
 										 `text`, `text_html`, `modify_date`)

htdocs/doc/sql/tables/cache_logs_modified.sql

@@ -15,5 +15,5 @@ CREATE TABLE `cache_logs_modified` (
   `text` mediumtext NOT NULL,
   `text_html` tinyint(1) NOT NULL,
   `modify_date` datetime default NULL,
-  KEY `id` (`id`, `modify_date`)
+  UNIQUE `id` (`id`, `modify_date`)
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8 ;