text: -- Table defining tag names for IDs. Also stores hit counts to avoid expensive queries on change_tag
  
  CREATE TABLE /*_*/change_tag_def (
      -- Numerical ID of the tag (ct_tag_id refers to this)
      ctd_id int NOT NULL CONSTRAINT PK_change_tag_def PRIMARY KEY IDENTITY,
      -- Symbolic name of the tag (what would previously be put in ct_tag)
      ctd_name nvarchar(255) NOT NULL,
      -- Whether this tag was defined manually by a privileged user using Special:Tags
      ctd_user_defined tinyint NOT NULL CONSTRAINT DF_ctd_user_defined DEFAULT 0,
      -- Number of times this tag was used
      ctd_count int NOT NULL CONSTRAINT DF_ctd_count DEFAULT 0
  ) /*$wgDBTableOptions*/;
  
  CREATE UNIQUE INDEX /*i*/ctd_name ON /*_*/change_tag_def (ctd_name);
  CREATE INDEX /*i*/ctd_count ON /*_*/change_tag_def (ctd_count);
  CREATE INDEX /*i*/ctd_user_defined ON /*_*/change_tag_def (ctd_user_defined);
  