# **ALTERs to run:** https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/GlobalBlocking/+/bdfa4a01272c793e190cbbf0169104a1f9a385e8/sql/mysql/patch-add-gbw_target_central_id.sql
# **Where to run those changes:** All (excluding the `centralauth` DB)
# **When to run those changes:** At any time
# **If the schema change is backwards compatible:** Yes.
# **If the schema change has been tested already on some of the test/beta wikis:** This change has been applied to the betawikis by update.php
# **If the data should be made available on the labs replicas and/or dumps:** As far as I am aware this table is public and I see no reason for this column not to be on labs replicas and/or dumps.
```name=The output of describe global_block_whitelist; from betawikis
MariaDB [enwiki]> describe global_block_whitelist;
+-----------------------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------------+------------------+------+-----+---------+-------+
| gbw_id | int(11) | NO | PRI | NULL | |
| gbw_address | varbinary(255) | NO | | NULL | |
| gbw_by | int(11) | NO | MUL | NULL | |
| gbw_by_text | varbinary(255) | NO | | NULL | |
| gbw_reason | varbinary(767) | NO | | NULL | |
| gbw_expiry | binary(14) | NO | | NULL | |
| gbw_target_central_id | int(10) unsigned | NO | | 0 | |
+-----------------------+------------------+------+-----+---------+-------+
7 rows in set (0.002 sec)
```