PostgreSQL version for updating log table

core/src/plugins/log.sql/update-from-5.2.2.pgsql

@@ -1,6 +1,19 @@
-CREATE TABLE `ajxp_log2` LIKE `ajxp_log.back`; INSERT `ajxp_log.back` SELECT * FROM `ajxp_log`;
-CREATE TABLE `ajxp_log2` LIKE `ajxp_log`; INSERT `ajxp_log2` SELECT * FROM `ajxp_log`;
-ALTER TABLE  `ajxp_log2` ADD  `source` VARCHAR( 255 ) NOT NULL AFTER  `user` , ADD INDEX (  `source` ) ;
-UPDATE `ajxp_log2` INNER JOIN ajxp_log ON ajxp_log2.id=ajxp_log.id SET ajxp_log2.source = ajxp_log.message, ajxp_log2.message = SUBSTRING_INDEX(SUBSTRING_INDEX(ajxp_log.params, '\t', 1), '\t', -1),ajxp_log2.params = SUBSTRING_INDEX(SUBSTRING_INDEX(ajxp_log.params, '\t', 2), '\t', -1);
-DROP TABLE `ajxp_log`;
-RENAME TABLE `ajxp_log2` TO `ajxp_log`;
+CREATE TABLE ajxp_log2 AS TABLE ajxp_log;
+
+ALTER TABLE  ajxp_log2
+  ADD source VARCHAR( 255 )
+;
+ALTER TABLE  ajxp_log2
+  ADD primary key (id)
+;
+
+UPDATE ajxp_log2 SET
+  source = ajxp_log.message,
+  message = split_part(ajxp_log.params,'\t', 1),
+  params = split_part(ajxp_log.params,'\t', 2)
+FROM ajxp_log
+WHERE ajxp_log2.id = ajxp_log.id
+;
+
+DROP TABLE ajxp_log;
+ALTER TABLE ajxp_log2 RENAME TO ajxp_log;