Hello,

Some Toolforge SQL queries have much worse performance when updated for the new comment table.

For example, see one previous SQL query and its updated version which just adds a join on the comment table. The change adds ten dependent subqueries and increases Stalktoy load times from ≈15 seconds to ≈245 seconds, and the same change for another query was enough to have my tools temporarily rate-limited.

I haven't found a way to update those queries efficiently. Is there an optimisation I'm missing? Why does the comment view need subqueries on ten other tables, and is there an alternate version without the subqueries for cases where we just need to join by ID?