Add a new field which will be replacing rc_type to allow various sources of recentchanges rows to identify themselves without requiring registration for a numeric constant.
We will not be migrating any existing data into this field, rather we will let it run for a month with the linked patch until the time based pruning of recentchanges deletes all rows that do not have the new field populated.
Which wikis are affected:
What is the change to those tables:
ALTER TABLE recentchanges ADD rc_source VARBINARY(16) NULL DEFAULT
Links to gerrit changes and/or other related bug reports.
- This change is accepted from an engineering fstandpoint, now ready for production db to be updated.