Noticed recently in Wikimedia Commons, that user_age variable has 0 value for estalished users; eg here:
https://commons.wikimedia.org/wiki/Special:AbuseLog/6966394
or here:
https://commons.wikimedia.org/wiki/Special:AbuseLog/6966463
According to documentation user_age should has 0 value only for unregistered users and this test is commonly used in many wikis to identify unregistered users. Changed behaviout may prevent many users from editing.
I assume this is just the old "accounts created before late 2008 don't have a new user log entry"?
Change 566621 had a related patch set uploaded (by Jforrester; owner: Jforrester):
[mediawiki/extensions/AbuseFilter@master] Follow-up 87459ec: When no registration date is recorded, use 2008-01-15
Change 566621 merged by jenkins-bot:
[mediawiki/extensions/AbuseFilter@master] Follow-up 87459ec: When no registration date is recorded, use 2008-01-15
Change 566624 had a related patch set uploaded (by Jforrester; owner: Jforrester):
[mediawiki/extensions/AbuseFilter@wmf/1.35.0-wmf.16] Follow-up 87459ec: When no registration date is recorded, use 2008-01-15
Change 566624 merged by jenkins-bot:
[mediawiki/extensions/AbuseFilter@wmf/1.35.0-wmf.16] Follow-up 87459ec: When no registration date is recorded, use 2008-01-15
Mentioned in SAL (#wikimedia-operations) [2020-01-23T01:40:40Z] <jforrester@deploy1001> Synchronized php-1.35.0-wmf.16/extensions/AbuseFilter/includes/AFComputedVariable.php: T243469 When no registration date is recorded, use 2008-01-15 (duration: 01m 08s)
OK, confirmed now fixed – on my personal account (which is old enough), I triggered the OTRS abuse filter, and it gave an appropriate age: https://commons.wikimedia.org/wiki/Special:AbuseFilter/examine/log/6966880
Belatedly, thank you for the quick fix! And I also like the choice of the date :) I got confused while removing the null fallback, and I didn't even think of the missing registrations.