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

backend/src/domain/page_analysis.rs

@@ -157,6 +157,46 @@ pub struct PageStatusItem {
     pub status: String,
 }
 
+/// One row in the admin analysis-history table: a completed or failed
+/// analysis pass resolved to its page/chapter/manga context. Sourced from
+/// the persistent `page_analysis` table (not the reaped job queue), so it
+/// survives indefinitely. `status` is `done` | `failed`.
+#[derive(Debug, Clone, Serialize, FromRow)]
+pub struct AnalysisHistoryRow {
+    pub page_id: Uuid,
+    pub page_number: i32,
+    pub chapter_id: Uuid,
+    pub chapter_number: i32,
+    pub manga_id: Uuid,
+    pub manga_title: String,
+    pub status: String,
+    pub is_nsfw: bool,
+    pub model: Option<String>,
+    pub error: Option<String>,
+    pub analyzed_at: Option<DateTime<Utc>>,
+    /// Wall-clock the worker spent on this page; `None` for rows analyzed
+    /// before duration tracking landed.
+    pub duration_ms: Option<i64>,
+}
+
+/// Per-model average analysis duration (admin Metrics tab).
+#[derive(Debug, Clone, Serialize, FromRow)]
+pub struct ModelDuration {
+    pub model: Option<String>,
+    pub avg_ms: Option<f64>,
+    pub n: i64,
+}
+
+/// Aggregate analysis timing/outcome roll-up over a time window.
+#[derive(Debug, Clone, Serialize)]
+pub struct AnalysisMetrics {
+    pub n: i64,
+    pub ok: i64,
+    pub failed: i64,
+    pub avg_ms: Option<f64>,
+    pub by_model: Vec<ModelDuration>,
+}
+
 /// One OCR line in the page-detail view.
 #[derive(Debug, Clone, Serialize, FromRow)]
 pub struct OcrLine {