To allow global autoblocks (T368949), we need to make it possible for there to be both an autoblock and regular IP block on a single IP address. This is so that we can leave an existing autoblock when an admin manually blocks an IP, to prevent the correlation of the IP (because the autoblock would be removed and then the IP block placed).
# **ALTERs to run:** https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/GlobalBlocking/+/d3017e1fb07c19aacc1b45b8e8592f34e7f21722/sql/mysql/patch-globalblocks-modify-gb_address-index.sql
# **Where to run those changes:** The `centralauth` DB
# **When to run those changes:** As soon as possible, blocker for T368949 and minor pilot wiki deployment of #temporary_accounts
# **If the schema change is backwards compatible:** Yes
# **If the schema change has been tested already on some of the test/beta wikis:** #GlobalBlocking is on the beta cluster, and this change has been applied there
# **If the data should be made available on the labs replicas and/or dumps:** No changes to the current view should be required