I was wondering if we have any advice for naming columns, especially TIMESTAMP columns, so I looked on the wiki and found that we're not supposed to use SQL92 keywords: https://wiki.koha-community.org/wiki/Coding_Guidelines#SQL2:_SQL92_keywords I'm not super familiar with all the keywords, but I'm confident that "timestamp" is one of those keywords. Here's the distribution on a dev Koha I have: 'created', 1 'created_on', 2 'date', 1 'dateadded', 1 'date_uploaded', 2 'dtcreated', 1 'lastmodified', 1 'message_date', 1 'modification_time', 1 'needed', 1 'time', 2 'timestamp', 26 'time_queued', 1 'updated', 1 'upload_timestamp', 2 'validated', 1 'valid_until', 1 I thought I'd check out DATETIME as well. Interestingly, there is a DATETIME column named "timestamp" as well: 'datearrived', 1 'datereviewed', 1 'datesent', 1 'datetime', 1 'date_approved', 1 'date_created', 3 'date_due', 2 'date_modified', 1 'date_run', 1 'issuedate', 2 'itemlost_on', 2 'lastreneweddate', 2 'last_modified', 1 'last_run', 1 'returndate', 2 'sharedate', 1 'start_time', 1 'suspend_until', 2 'timeclicked', 1 'timestamp', 1 'withdrawn_on', 2 It seems undesirable to use timestamp for things like "upload_timestamp" and "message_date" as well, as TIMESTAMP will automatically update when that row is updated as per these conditions: http://dev.mysql.com/doc/refman/5.7/en/timestamp-initialization.html. Anyway, something to think about. David Cook Systems Librarian Prosentient Systems 72/330 Wattle St Ultimo, NSW 2007 Office: 02 9212 0899 Direct: 02 8005 0595