-- Back the default catalog ordering. Since 0.88.0 the catalog list defaults to
-- `ORDER BY updated_at DESC, id` (the no-filter default path), but the only
-- existing updated_at index on mangas is the PARTIAL `mangas_missing_cover_idx`
-- (WHERE cover_image_path IS NULL), which Postgres can't use for the unfiltered
-- ordering. `created_at` and `lower(title)` already have full indexes from
-- 0001; this gives the new default sort column the same treatment.
--
-- `id` is included as a trailing key so the index also covers the stable
-- `, id` tie-break the listing appends for deterministic pagination.
--
-- Not CONCURRENTLY: sqlx::migrate! wraps each migration in a transaction, and
-- CREATE INDEX CONCURRENTLY can't run inside one. The table is small at our
-- scale, so a brief lock on an online deploy is acceptable.

CREATE INDEX IF NOT EXISTS mangas_updated_at_idx
    ON mangas (updated_at DESC, id);