*bump* (there was already a reminder about this in Scrum of Scrums recently, but another one here can't hurt)

To make it extra clear, it's not enough to whitelist information on the schema talk page, filing a Phabricator ticket or such is needed too. The most recent version of the whitelist (here, temporary location) dates from July 2016, and while some tickets may have been filed recently, it's quite possible that there are people who are not aware of this requirement. Here is a Quarry query for all schema pages (and talk pages) that have been edited since 2016:

BTW, for the record, the first step of this purging effort already happened, involving dropping completely 124 old EventLogging tables that had no event recorded in the last 90 days and were not in the whitelist. A list of these tables that were deleted last month is now available.