None of these commands is reversable, and all of them but the 2 about dragoon's dirk insta change every of your items. Why not also posting how to make a quick backup/restore of the items table, like :
dump, will generate a text file named items.sql :
mysqldump -u `username` -p eq items > items.sql
restore (from mysql.exe) :
mysql> use eq;
mysql> delete from items;
mysql> source items.sql;
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