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240d0efa7e
Adds `created_unix` as the third column of the `c_u` composite index on the `action` table, changing it from `(user_id, is_deleted)` to `(user_id, is_deleted, created_unix)`. Migration 337 drops and recreates the index. No data is touched. ## Root causes #32333 introduced the `c_u` index to speed up dashboard queries, but defined it as `(user_id, is_deleted)` — without `created_unix`. #3368 The simple query is now efficient enough for the database to actually use `c_u`, but because `created_unix` is absent from the index, the database must load and sort **every** matching row before returning the first page of 20. The existing `c_u_d` index `(created_unix, user_id, is_deleted)` does not help because its leading column is `created_unix`, which can't be used for an equality seek on `user_id`. Those two caused this issue: https://github.com/go-gitea/gitea/issues/38075 With the fix, the database seeks directly to `(user_id=X, is_deleted=false)` and walks `created_unix` in descending order, stopping after 20 rows. Fixes https://github.com/go-gitea/gitea/issues/38075