docs/schema.txt

   1 The most up-to-date schema for the tables in the database
   2 will always be "tables.sql" in the maintenance directory,
   3 which is called from the installation script.
   4
   5 That file has been commented with details of the usage for
   6 each table and field.
   7
   8 Historical information and some other notes are available at
   9 https://www.mediawiki.org/wiki/Manual:Database_layout