CREATE INDEX /*i*/cl_collation_ext ON /*_*/categorylinks (cl_collation, cl_to, cl_type, cl_from);
--
--- Track all existing categories. Something is a category if 1) it has an en-
--- try somewhere in categorylinks, or 2) it once did. Categories might not
--- have corresponding pages, so they need to be tracked separately.
+-- Track all existing categories. Something is a category if 1) it has an entry
+-- somewhere in categorylinks, or 2) it has a description page. Categories
+-- might not have corresponding pages, so they need to be tracked separately.
--
CREATE TABLE /*_*/category (
-- Primary key