fix(web): detail row lookup walks all pages of the Site read (#144)

backend/internal/web/admin_series_detail.go

@@ -36,27 +36,35 @@ type seriesDetailView struct {
 // adminSeriesDetail renders one Series' page, keyed by the composite
 // "<site>:<series_id>" the list row already shows. The row is read through
 // the list's own SeriesPage read narrowed to the key's Site: the admin
-// projection is the privacy boundary, and a second single-row read would be a
-// second definition of it.
-// ponytail: one 50-row page scan per detail view; a keyed read alongside
-// SeriesPage when the library outgrows the page size.
+// projection is the privacy boundary, and a dedicated single-row read would
+// be a second definition of it.
+// ponytail: a page scan per detail view, one query per page of the Site's
+// rows up to the window total; a keyed read alongside SeriesPage when the
+// library outgrows the page size.
 func (h *Handler) adminSeriesDetail(w http.ResponseWriter, r *http.Request) {
 	site, seriesID, ok := strings.Cut(r.PathValue("key"), ":")
 	if !ok || site == "" || seriesID == "" {
 		http.NotFound(w, r)
 		return
 	}
-	page, err := h.store.SeriesPage(store.SeriesFilter{Site: site})
-	if err != nil {
-		log.Printf("series detail %s: %v", site+":"+seriesID, err)
-		http.Error(w, "internal error", http.StatusInternalServerError)
-		return
-	}
-	for i := range page.Rows {
-		if page.Rows[i].SeriesID == seriesID {
-			h.renderAdmin(w, adminView{Page: "series-detail", Detail: h.seriesDetailView(page.Rows[i])})
+	seen := 0
+	for page := 1; ; page++ {
+		p, err := h.store.SeriesPage(store.SeriesFilter{Site: site, Page: page})
+		if err != nil {
+			log.Printf("series detail %s: %v", site+":"+seriesID, err)
+			http.Error(w, "internal error", http.StatusInternalServerError)
 			return
 		}
+		seen += len(p.Rows)
+		for i := range p.Rows {
+			if p.Rows[i].SeriesID == seriesID {
+				h.renderAdmin(w, adminView{Page: "series-detail", Detail: h.seriesDetailView(p.Rows[i])})
+				return
+			}
+		}
+		if seen >= p.Total {
+			break
+		}
 	}
 	http.NotFound(w, r)
 }