feat(admin): observability — job history, live now-analyzing, durations & metrics (0.84.0) (#6)

backend/src/repo/page.rs

@@ -60,6 +60,27 @@ pub async fn locate(
     Ok(row)
 }
 
+/// Like [`locate`] but also resolves the manga title and chapter number, so
+/// live analysis events can carry human labels for the "now analyzing"
+/// banner without the dashboard having to look them up. Returns
+/// `(manga_id, manga_title, chapter_id, chapter_number, page_number)`.
+pub async fn locate_labeled(
+    pool: &PgPool,
+    page_id: Uuid,
+) -> AppResult<Option<(Uuid, String, Uuid, i32, i32)>> {
+    let row: Option<(Uuid, String, Uuid, i32, i32)> = sqlx::query_as(
+        "SELECT c.manga_id, m.title, p.chapter_id, c.number, p.page_number \
+           FROM pages p \
+           JOIN chapters c ON c.id = p.chapter_id \
+           JOIN mangas m   ON m.id = c.manga_id \
+          WHERE p.id = $1",
+    )
+    .bind(page_id)
+    .fetch_optional(pool)
+    .await?;
+    Ok(row)
+}
+
 pub async fn list_for_chapter(pool: &PgPool, chapter_id: Uuid) -> AppResult<Vec<Page>> {
     let rows = sqlx::query_as::<_, Page>(
         r#"