Why:
Temporary accounts (introduced as part of IP Masking)
are supposed to expire 1 year after their registration.
Automatic account expiration can be done via a maintenance
script, which would be periodically executed via cron / systemd.
Make it possible for extensions to provide their own logic
for generating a list of temporary accounts to invalidate.
This is used in CentralAuth to base registration timestamp
on the global registration timestamp.
The default behavior is "temporary accounts do not expire",
given the feature requires a maintenance script to run
periodically, which will not be the case on third party
instances.
What:
* Add `expireAfterDays` to $wgAutoCreateTempUser, controlling
how many days temporary accounts have.
* Add UserSelectQueryBuilder::whereRegisteredTimestamp(),
filtering accounts based on user_registration.
* Add ExpireTemporaryAccounts maintenance script, which is
@stable to extend.
Bug: T344695
Change-Id: If17bf84ee6620c8eb784b7d835682ad5e7afdfcc
c9908da103