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   1  CREATE TYPE link_type AS ENUM ('page', 'subcat', 'file');
   2  DROP INDEX cl_sortkey;
   3  ALTER TABLE categorylinks
   4      ADD COLUMN cl_sortkey_prefix TEXT NOT NULL DEFAULT '',
   5      ADD COLUMN cl_collation SMALLINT NOT NULL DEFAULT 0,
   6      ADD COLUMN cl_type link_type NOT NULL DEFAULT 'page';
   7  CREATE INDEX cl_collation ON categorylinks ( cl_collation );
   8  CREATE INDEX cl_sortkey ON categorylinks ( cl_to, cl_type, cl_sortkey, cl_from );