We're loading all public-facing resources - so posts, tags, authors and importantly the relations between them - in as few queries as possible, using fairly typical where...in queries in order to build the relations. SQLite uses variables for in queries, and so sites with a lot of content triggered the "more than 999 variables" error.
Solvable, of course, but quite an interesting limitation to discover!
Solvable, of course, but quite an interesting limitation to discover!