feat(mangas): per-field sort options + direction toggle on the catalog (0.88.0)

Sort the manga catalog by created / updated / title / author with an
independent asc/desc direction control. An omitted `order` defaults per field
(dates newest-first, text A→Z), matching the UI, so a bare `?sort=<field>`
means the same thing in the browser and over the API; `sort=recent` remains a
back-compat alias for `created`.

- Backend: SortField/SortOrder parsed with validation (structured 422 on bad
  input), per-field default_order, NULLS LAST only on the nullable author key,
  and migration 0033 indexing mangas(updated_at DESC, id) to back the default
  sort and its id tie-break.
- Frontend: catalog sort field + direction (SegmentedControl) on desktop and a
  mobile bottom sheet; pure helpers in $lib/mangaSort; keyboard-accessible
  direction control; visible Direction labels and a sheet "Done" button.
- Tests: backend integration coverage (defaults, alias, invalid input,
  ascending-id tie-break), frontend unit + e2e.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/Cargo.lock

@@ -1517,7 +1517,7 @@ checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
 [[package]]
 name = "mangalord"
-version = "0.87.26"
+version = "0.88.0"
 dependencies = [
  "anyhow",
  "argon2",

backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mangalord"
-version = "0.87.26"
+version = "0.88.0"
 edition = "2021"
 default-run = "mangalord"
 

backend/migrations/0033_mangas_updated_at_index.sql

@@ -0,0 +1,16 @@
+-- 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);

backend/src/api/mangas.rs

@@ -51,14 +51,58 @@ pub struct ListParams {
     pub limit: i64,
     #[serde(default)]
     pub offset: i64,
+    /// Sort field: `created`, `updated` (default), `title`, or `author`.
+    /// Also accepts the legacy `recent` alias (== `created`). Anything
+    /// else → 422.
     #[serde(default)]
-    pub sort: repo::manga::ListSort,
+    pub sort: Option<String>,
+    /// `asc` or `desc`. Omitted → the field's natural default
+    /// (dates `desc`, text `asc`). Anything else → 422.
+    #[serde(default)]
+    pub order: Option<String>,
 }
 
 fn default_limit() -> i64 {
     50
 }
 
+/// Parse the `sort` wire value into a [`repo::manga::SortField`]. Validation
+/// and the legacy `recent` alias live here (not in serde) so unknown values
+/// return the structured 422 envelope rather than axum's plain-text
+/// `QueryRejection`, matching the rest of this handler's filters.
+fn parse_sort(raw: Option<&str>) -> AppResult<repo::manga::SortField> {
+    use repo::manga::SortField;
+    match raw.map(str::trim) {
+        None | Some("") | Some("updated") => Ok(SortField::Updated),
+        // `recent` was the pre-0.88 name for "newest created first"; keep it
+        // as an alias so existing bots/scripts don't break.
+        Some("created") | Some("recent") => Ok(SortField::Created),
+        Some("title") => Ok(SortField::Title),
+        Some("author") => Ok(SortField::Author),
+        Some(other) => Err(AppError::ValidationFailed {
+            message: format!(
+                "sort must be one of created, updated, title, author (got {other:?})"
+            ),
+            details: json!({ "sort": "invalid" }),
+        }),
+    }
+}
+
+/// Parse the `order` wire value. `None` means the client omitted it, so the
+/// caller applies the field's natural default. An explicit unknown value → 422.
+fn parse_order(raw: Option<&str>) -> AppResult<Option<repo::manga::SortOrder>> {
+    use repo::manga::SortOrder;
+    match raw.map(str::trim) {
+        None | Some("") => Ok(None),
+        Some("asc") => Ok(Some(SortOrder::Asc)),
+        Some("desc") => Ok(Some(SortOrder::Desc)),
+        Some(other) => Err(AppError::ValidationFailed {
+            message: format!("order must be 'asc' or 'desc' (got {other:?})"),
+            details: json!({ "order": "invalid" }),
+        }),
+    }
+}
+
 fn parse_uuid_csv(field: &str, raw: Option<&str>) -> AppResult<Vec<Uuid>> {
     let Some(raw) = raw else { return Ok(Vec::new()) };
     let mut out = Vec::new();
@@ -94,6 +138,10 @@ async fn list(
             Some(s.to_string())
         }
     };
+    let sort = parse_sort(params.sort.as_deref())?;
+    // Omitted `order` falls back to the field's natural direction, so a bare
+    // `?sort=title` reads A→Z just like the UI shows it.
+    let order = parse_order(params.order.as_deref())?.unwrap_or_else(|| sort.default_order());
     let q = repo::manga::ListQuery {
         search: params.search.filter(|s| !s.trim().is_empty()),
         status,
@@ -104,7 +152,8 @@ async fn list(
         cw_exclude: crate::api::page_tags::parse_warnings_csv(params.cw_exclude.as_deref())?,
         limit,
         offset,
-        sort: params.sort,
+        sort,
+        order,
     };
     let (items, total) = repo::manga::list_cards(&state.db, &q).await?;
     Ok(Json(PagedResponse::with_total(items, limit, offset, total)))

backend/src/repo/manga.rs

@@ -5,7 +5,6 @@
 //! handlers depend only on `sqlx::PgPool`, not on a trait object. Swap to
 //! a trait + impl if a second backend ever becomes necessary.
 
-use serde::Deserialize;
 use sqlx::{PgConnection, PgExecutor, PgPool};
 use uuid::Uuid;
 
@@ -18,14 +17,43 @@ use crate::repo;
 pub const STATUSES: &[&str] = &["ongoing", "completed"];
 pub const DEFAULT_STATUS: &str = "ongoing";
 
-#[derive(Debug, Clone, Copy, Default, Deserialize)]
-#[serde(rename_all = "snake_case")]
-pub enum ListSort {
-    /// Newest first (default).
+/// Which column the listing is ordered by. The direction lives in a separate
+/// [`SortOrder`] so any field can be sorted either way. Wire values are parsed
+/// (with validation and the legacy `recent` alias) in `api::mangas`, not via
+/// serde, so this stays a plain domain enum.
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
+pub enum SortField {
+    /// Creation time.
+    Created,
+    /// Last-modified time (default — "last updated first" pairs with `Desc`).
     #[default]
-    Recent,
-    /// A→Z by title (case-insensitive).
+    Updated,
+    /// Title (case-insensitive).
     Title,
+    /// Alphabetically-first attached author (case-insensitive); authorless
+    /// mangas sort last regardless of direction.
+    Author,
+}
+
+impl SortField {
+    /// The direction applied when the client omits `order`. Dates read
+    /// newest-first (`Desc`); text reads A→Z (`Asc`). This mirrors the
+    /// frontend's `defaultOrderFor` (see `frontend/src/lib/mangaSort.ts`) so a
+    /// bare `?sort=<field>` link means the same thing to the UI and the API.
+    pub fn default_order(self) -> SortOrder {
+        match self {
+            SortField::Created | SortField::Updated => SortOrder::Desc,
+            SortField::Title | SortField::Author => SortOrder::Asc,
+        }
+    }
+}
+
+/// Sort direction.
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
+pub enum SortOrder {
+    Asc,
+    #[default]
+    Desc,
 }
 
 #[derive(Debug, Clone, Default)]
@@ -42,7 +70,8 @@ pub struct ListQuery {
     pub cw_exclude: Vec<String>,
     pub limit: i64,
     pub offset: i64,
-    pub sort: ListSort,
+    pub sort: SortField,
+    pub order: SortOrder,
 }
 
 /// Single source of truth for the `mangas` columns that hydrate a [`Manga`],
@@ -130,16 +159,42 @@ const FILTER_WHERE: &str = r#"
 "#;
 
 /// Returns the page of mangas matching `query` plus the unfiltered total
-/// count for the same filter. The trigram GIN indexes (see 0005_search.sql
-/// and 0009_manga_metadata.sql) keep both queries cheap as the library
-/// grows.
+/// count for the same filter. The date/title sort columns are index-backed
+/// (`mangas_created_at_idx`, `mangas_updated_at_idx`, `mangas_title_lower_idx`)
+/// and the trigram GIN indexes (0005_search.sql, 0009_manga_metadata.sql) keep
+/// the search filter cheap as the library grows.
 pub async fn list(pool: &PgPool, query: &ListQuery) -> AppResult<(Vec<Manga>, i64)> {
-    // `order_by` is interpolated from a hard-coded enum, never from request
-    // input, so this is not a SQL injection seam.
-    let order_by = match query.sort {
-        ListSort::Recent => "created_at DESC, id",
-        ListSort::Title => "lower(title) ASC, id",
+    // Both `col` and `dir` are interpolated from hard-coded enums, never from
+    // request input, so this is not a SQL injection seam. The trailing `id` is
+    // a stable tie-break that keeps pagination deterministic across rows with
+    // equal sort keys.
+    let col = match query.sort {
+        SortField::Created => "created_at",
+        SortField::Updated => "updated_at",
+        SortField::Title => "lower(title)",
+        // Sorts on the alphabetically-first attached author. As an ORDER BY
+        // key this correlated subquery is evaluated per filter-matching row
+        // before LIMIT applies, so it scales worse than the indexed date/title
+        // sorts — revisit with a LATERAL join or precomputed sort-name column
+        // if the library grows large.
+        SortField::Author => {
+            "(SELECT min(lower(a.name)) \
+               FROM manga_authors ma JOIN authors a ON a.id = ma.author_id \
+              WHERE ma.manga_id = mangas.id)"
+        }
     };
+    let dir = match query.order {
+        SortOrder::Asc => "ASC",
+        SortOrder::Desc => "DESC",
+    };
+    // Only the author key can be NULL (authorless mangas); keep those last in
+    // both directions. The date/title columns are NOT NULL, so they need no
+    // NULLS clause — and omitting it lets a reverse index scan satisfy `DESC`.
+    let nulls = match query.sort {
+        SortField::Author => " NULLS LAST",
+        _ => "",
+    };
+    let order_by = format!("{col} {dir}{nulls}, id");
 
     let search = query.search.as_deref();
     let status = query.status.as_deref();

backend/tests/api_mangas.rs

@@ -11,6 +11,53 @@ fn metadata(title: &str) -> serde_json::Value {
     json!({ "title": title })
 }
 
+/// Collect the `title` field of every item in a list response, in order.
+fn title_list(body: &serde_json::Value) -> Vec<&str> {
+    body["items"]
+        .as_array()
+        .unwrap()
+        .iter()
+        .map(|m| m["title"].as_str().unwrap())
+        .collect()
+}
+
+/// Create a manga via the upload API, asserting it succeeded.
+async fn seed(app: &axum::Router, cookie: &str, title: &str) {
+    let resp = app
+        .clone()
+        .oneshot(common::post_multipart_with_cookie(
+            "/api/v1/mangas",
+            MultipartBuilder::new().add_json("metadata", json!({ "title": title })),
+            cookie,
+        ))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::CREATED, "seed({title}) failed");
+}
+
+/// Pin a manga's `created_at` to an explicit RFC3339 instant so time-based
+/// ordering assertions don't depend on insert timing.
+async fn set_created_at(pool: &PgPool, title: &str, when: &str) {
+    let ts: chrono::DateTime<chrono::Utc> = when.parse().unwrap();
+    sqlx::query("UPDATE mangas SET created_at = $1 WHERE title = $2")
+        .bind(ts)
+        .bind(title)
+        .execute(pool)
+        .await
+        .unwrap();
+}
+
+/// Pin a manga's `updated_at` to an explicit RFC3339 instant.
+async fn set_updated_at(pool: &PgPool, title: &str, when: &str) {
+    let ts: chrono::DateTime<chrono::Utc> = when.parse().unwrap();
+    sqlx::query("UPDATE mangas SET updated_at = $1 WHERE title = $2")
+        .bind(ts)
+        .bind(title)
+        .execute(pool)
+        .await
+        .unwrap();
+}
+
 #[sqlx::test(migrations = "./migrations")]
 async fn list_is_empty_initially(pool: PgPool) {
     let h = common::harness(pool);
@@ -103,19 +150,307 @@ async fn list_sort_title_orders_alphabetically(pool: PgPool) {
             .unwrap();
     }
 
+    // Title sort now requires an explicit direction; the wire default is
+    // `desc`, so A→Z needs `order=asc`.
+    let resp = h
+        .app
+        .oneshot(common::get("/api/v1/mangas?sort=title&order=asc"))
+        .await
+        .unwrap();
+    let body = common::body_json(resp).await;
+    let titles = title_list(&body);
+    assert_eq!(titles, vec!["Berserk", "One Piece", "Vinland Saga"]);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn list_sort_title_desc_orders_reverse_alphabetically(pool: PgPool) {
+    let h = common::harness(pool);
+    let (_, cookie) = common::register_user(&h.app).await;
+
+    for title in ["Vinland Saga", "Berserk", "One Piece"] {
+        seed(&h.app, &cookie, title).await;
+    }
+
+    let resp = h
+        .app
+        .oneshot(common::get("/api/v1/mangas?sort=title&order=desc"))
+        .await
+        .unwrap();
+    let body = common::body_json(resp).await;
+    let titles = title_list(&body);
+    assert_eq!(titles, vec!["Vinland Saga", "One Piece", "Berserk"]);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn list_default_sort_is_updated_desc(pool: PgPool) {
+    let h = common::harness(pool.clone());
+    let (_, cookie) = common::register_user(&h.app).await;
+
+    for title in ["Alpha", "Bravo", "Charlie"] {
+        seed(&h.app, &cookie, title).await;
+    }
+    // Pin explicit, distinct update times so the default ordering is
+    // deterministic regardless of insert timing. Bravo is the most recently
+    // updated and must appear first under the default (updated DESC).
+    set_updated_at(&pool, "Alpha", "2020-01-01T00:00:00Z").await;
+    set_updated_at(&pool, "Bravo", "2023-01-01T00:00:00Z").await;
+    set_updated_at(&pool, "Charlie", "2021-01-01T00:00:00Z").await;
+
+    // No sort/order params — exercises the default.
+    let resp = h.app.oneshot(common::get("/api/v1/mangas")).await.unwrap();
+    let body = common::body_json(resp).await;
+    let titles = title_list(&body);
+    assert_eq!(titles, vec!["Bravo", "Charlie", "Alpha"]);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn list_sort_created_orders_by_creation_time(pool: PgPool) {
+    let h = common::harness(pool.clone());
+    let (_, cookie) = common::register_user(&h.app).await;
+
+    for title in ["Alpha", "Bravo", "Charlie"] {
+        seed(&h.app, &cookie, title).await;
+    }
+    set_created_at(&pool, "Alpha", "2020-01-01T00:00:00Z").await;
+    set_created_at(&pool, "Bravo", "2023-01-01T00:00:00Z").await;
+    set_created_at(&pool, "Charlie", "2021-01-01T00:00:00Z").await;
+
+    // Newest-created first.
+    let resp = h
+        .app
+        .clone()
+        .oneshot(common::get("/api/v1/mangas?sort=created&order=desc"))
+        .await
+        .unwrap();
+    let body = common::body_json(resp).await;
+    assert_eq!(title_list(&body), vec!["Bravo", "Charlie", "Alpha"]);
+
+    // Ascending is the exact reverse.
+    let resp = h
+        .app
+        .oneshot(common::get("/api/v1/mangas?sort=created&order=asc"))
+        .await
+        .unwrap();
+    let body = common::body_json(resp).await;
+    assert_eq!(title_list(&body), vec!["Alpha", "Charlie", "Bravo"]);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn list_sort_author_orders_by_author_name_nulls_last(pool: PgPool) {
+    let h = common::harness(pool);
+    let (_, cookie) = common::register_user(&h.app).await;
+
+    // Author order is deliberately scrambled relative to title order so the
+    // assertion can't pass by accidentally sorting on title.
+    for (title, authors) in [
+        ("Akira", json!(["Beta Author"])),
+        ("Boku", json!(["Alpha Author"])),
+        ("Chi", json!(["Gamma Author"])),
+        ("NoAuthor", json!([])),
+    ] {
+        let _ = h
+            .app
+            .clone()
+            .oneshot(common::post_multipart_with_cookie(
+                "/api/v1/mangas",
+                MultipartBuilder::new()
+                    .add_json("metadata", json!({ "title": title, "authors": authors })),
+                &cookie,
+            ))
+            .await
+            .unwrap();
+    }
+
+    // Ascending by author name; the authorless manga sorts last (NULLS LAST).
+    let resp = h
+        .app
+        .clone()
+        .oneshot(common::get("/api/v1/mangas?sort=author&order=asc"))
+        .await
+        .unwrap();
+    let body = common::body_json(resp).await;
+    assert_eq!(title_list(&body), vec!["Boku", "Akira", "Chi", "NoAuthor"]);
+
+    // Descending flips the authored mangas but keeps the authorless one last.
+    let resp = h
+        .app
+        .oneshot(common::get("/api/v1/mangas?sort=author&order=desc"))
+        .await
+        .unwrap();
+    let body = common::body_json(resp).await;
+    assert_eq!(title_list(&body), vec!["Chi", "Akira", "Boku", "NoAuthor"]);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn list_sort_recent_alias_maps_to_created_desc(pool: PgPool) {
+    // `recent` was the pre-0.88 sort value (newest created first). It is kept
+    // as an alias for `created` so existing bots/scripts don't break.
+    let h = common::harness(pool.clone());
+    let (_, cookie) = common::register_user(&h.app).await;
+
+    for title in ["Alpha", "Bravo", "Charlie"] {
+        seed(&h.app, &cookie, title).await;
+    }
+    set_created_at(&pool, "Alpha", "2020-01-01T00:00:00Z").await;
+    set_created_at(&pool, "Bravo", "2023-01-01T00:00:00Z").await;
+    set_created_at(&pool, "Charlie", "2021-01-01T00:00:00Z").await;
+
+    let resp = h
+        .app
+        .oneshot(common::get("/api/v1/mangas?sort=recent"))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::OK);
+    let body = common::body_json(resp).await;
+    // Same ordering as `sort=created&order=desc`: newest-created first.
+    assert_eq!(title_list(&body), vec!["Bravo", "Charlie", "Alpha"]);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn list_sort_field_defaults_direction_per_field(pool: PgPool) {
+    // When `order` is omitted, the API applies the field's natural direction:
+    // text fields ascend (A→Z), matching the frontend's `defaultOrderFor`, so
+    // a bare `?sort=title` link reads the same in the UI and over the wire.
+    let h = common::harness(pool);
+    let (_, cookie) = common::register_user(&h.app).await;
+
+    for title in ["Vinland Saga", "Berserk", "One Piece"] {
+        seed(&h.app, &cookie, title).await;
+    }
+
     let resp = h
         .app
         .oneshot(common::get("/api/v1/mangas?sort=title"))
         .await
         .unwrap();
+    assert_eq!(resp.status(), StatusCode::OK);
     let body = common::body_json(resp).await;
-    let titles: Vec<&str> = body["items"]
-        .as_array()
-        .unwrap()
+    assert_eq!(title_list(&body), vec!["Berserk", "One Piece", "Vinland Saga"]);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn list_sort_author_default_is_ascending_nulls_last(pool: PgPool) {
+    // The other text field: a bare `?sort=author` must default to ascending and
+    // keep authorless mangas last (NULLS LAST), exercising the omitted-order
+    // path through the author subquery — not just `title`.
+    let h = common::harness(pool);
+    let (_, cookie) = common::register_user(&h.app).await;
+
+    for (title, authors) in [
+        ("Akira", json!(["Beta Author"])),
+        ("Boku", json!(["Alpha Author"])),
+        ("NoAuthor", json!([])),
+    ] {
+        let _ = h
+            .app
+            .clone()
+            .oneshot(common::post_multipart_with_cookie(
+                "/api/v1/mangas",
+                MultipartBuilder::new()
+                    .add_json("metadata", json!({ "title": title, "authors": authors })),
+                &cookie,
+            ))
+            .await
+            .unwrap();
+    }
+
+    let resp = h
+        .app
+        .oneshot(common::get("/api/v1/mangas?sort=author"))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::OK);
+    let body = common::body_json(resp).await;
+    // Alpha Author (Boku) < Beta Author (Akira); authorless sorts last.
+    assert_eq!(title_list(&body), vec!["Boku", "Akira", "NoAuthor"]);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn list_rejects_invalid_sort_and_order_with_envelope(pool: PgPool) {
+    let h = common::harness(pool);
+
+    // Unknown sort field → structured 422, not axum's plain-text 400.
+    let resp = h
+        .app
+        .clone()
+        .oneshot(common::get("/api/v1/mangas?sort=bogus"))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::UNPROCESSABLE_ENTITY);
+    let body = common::body_json(resp).await;
+    assert_eq!(body["error"]["details"]["sort"], "invalid");
+
+    // Unknown order → same treatment.
+    let resp = h
+        .app
+        .oneshot(common::get("/api/v1/mangas?order=sideways"))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::UNPROCESSABLE_ENTITY);
+    let body = common::body_json(resp).await;
+    assert_eq!(body["error"]["details"]["order"], "invalid");
+}
+
+/// Pin a manga's primary key to an explicit UUID. Safe only for freshly
+/// seeded mangas with no chapters/authors/tags referencing them.
+async fn set_id(pool: &PgPool, title: &str, id: &str) {
+    let uuid: uuid::Uuid = id.parse().unwrap();
+    sqlx::query("UPDATE mangas SET id = $1 WHERE title = $2")
+        .bind(uuid)
+        .bind(title)
+        .execute(pool)
+        .await
+        .unwrap();
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn list_tie_break_orders_equal_keys_by_ascending_id(pool: PgPool) {
+    // The trailing `, id` in ORDER BY is what keeps pagination stable when the
+    // primary sort key ties. Pin three mangas to the SAME created_at and assign
+    // ids whose ascending order (Bravo < Charlie < Alpha) deliberately differs
+    // from insertion/physical order, so the expected ordering can ONLY come
+    // from the id tie-break.
+    //
+    // We sort by `created` on purpose: `mangas_created_at_idx` is `(created_at
+    // DESC)` with no id, so it does NOT encode the secondary order — unlike the
+    // default `updated` path, whose `mangas_updated_at_idx (updated_at DESC,
+    // id)` would mask a missing clause. Drop `, id` from the query and this
+    // test fails.
+    let h = common::harness(pool.clone());
+    let (_, cookie) = common::register_user(&h.app).await;
+
+    for title in ["Alpha", "Bravo", "Charlie"] {
+        seed(&h.app, &cookie, title).await;
+        set_created_at(&pool, title, "2022-01-01T00:00:00Z").await;
+    }
+    set_id(&pool, "Alpha", "33333333-3333-4333-8333-333333333333").await;
+    set_id(&pool, "Bravo", "11111111-1111-4111-8111-111111111111").await;
+    set_id(&pool, "Charlie", "22222222-2222-4222-8222-222222222222").await;
+
+    let page = |limit: i64, offset: i64| {
+        let app = h.app.clone();
+        async move {
+            let resp = app
+                .oneshot(common::get(&format!(
+                    "/api/v1/mangas?sort=created&limit={limit}&offset={offset}"
+                )))
+                .await
+                .unwrap();
+            common::body_json(resp).await
+        }
+    };
+
+    // Single page: tied rows come back in ascending-id order.
+    let full = page(50, 0).await;
+    assert_eq!(title_list(&full), vec!["Bravo", "Charlie", "Alpha"]);
+
+    // Paginating one row at a time reproduces that exact sequence — no overlap,
+    // no gap — which only holds because the id tie-break makes the order total.
+    let paged: Vec<String> = vec![page(1, 0).await, page(1, 1).await, page(1, 2).await]
         .iter()
-        .map(|m| m["title"].as_str().unwrap())
+        .map(|b| b["items"][0]["title"].as_str().unwrap().to_string())
         .collect();
-    assert_eq!(titles, vec!["Berserk", "One Piece", "Vinland Saga"]);
+    assert_eq!(paged, vec!["Bravo", "Charlie", "Alpha"]);
 }
 
 #[sqlx::test(migrations = "./migrations")]