fix subscription dedup availability tracking

internal/service/subscription.go

@@ -315,6 +315,7 @@ func (s *SubscriptionService) enqueueRSSSubscriptionCandidate(ctx context.Contex
 		AllowExistingLibrary: sub.WashEnabled,
 	}); err != nil {
 		if IsDownloadDedupError(err) {
+			state.markCandidateAvailable(candidate)
 			state.markSeen(candidate.GUID)
 			return false
 		}
@@ -358,6 +359,12 @@ func (state *rssSubscriptionRunState) markTitleAvailable(title string) {
 	}
 }
 
+func (state *rssSubscriptionRunState) markCandidateAvailable(candidate siteSearchCandidate) {
+	if state.washOff {
+		addSiteSearchCandidateAvailability(candidate, &state.availability)
+	}
+}
+
 func (state *rssSubscriptionRunState) markSeen(guid string) {
 	state.seen = append(state.seen, guid)
 	if state.seenSet != nil {

internal/service/subscription_availability_test.go

@@ -226,7 +226,7 @@ func TestSubscriptionPendingDownloadAvailabilityIncludesLiveQBTorrents(t *testin
 	}
 }
 
-func TestSiteSearchDownloadDedupDoesNotMarkCandidateAvailable(t *testing.T) {
+func TestSiteSearchDownloadDedupMarksCandidateAvailable(t *testing.T) {
 	db := newServiceTestDB(t, &model.DownloadTask{}, &model.Setting{})
 	repos := repository.New(db)
 	sub := &model.Subscription{
@@ -281,10 +281,12 @@ func TestSiteSearchDownloadDedupDoesNotMarkCandidateAvailable(t *testing.T) {
 	if title != "" {
 		t.Fatalf("queued title = %q, want empty on dedup", title)
 	}
-	if _, ok := state.Availability.ExistingEpisodeKeys[episodeKey(1, 7)]; ok {
+	for _, episode := range []int{7, 8} {
-		t.Fatalf("deduped candidate should not mark E07 available: %#v", state.Availability.ExistingEpisodeKeys)
+		if _, ok := state.Availability.ExistingEpisodeKeys[episodeKey(1, episode)]; !ok {
+			t.Fatalf("deduped candidate should mark E%d available: %#v", episode, state.Availability.ExistingEpisodeKeys)
+		}
 	}
-	if len(state.Seen) != 0 {
+	if len(state.Seen) != 1 || state.Seen[0] != "site|mteam|nanyang-7-8" {
-		t.Fatalf("deduped candidate should not be marked seen: %#v", state.Seen)
+		t.Fatalf("deduped candidate should be marked seen: %#v", state.Seen)
 	}
 }

internal/service/subscription_site_search_enqueue.go

@@ -68,6 +68,7 @@ func (s *SubscriptionService) enqueueSiteSearchCandidate(ctx context.Context, su
 		AllowExistingLibrary: sub.WashEnabled,
 	}); err != nil {
 		if IsDownloadDedupError(err) {
+			state.markCandidateAvailable(candidate)
 			s.logSiteSearchCandidateSkipped(sub, state, candidate, "download_dedup", mediaType, mediaCategory, savePath)
 			return "", nil
 		}

internal/service/subscription_site_search_enqueue_test.go

@@ -0,0 +1,77 @@
+package service
+
+import (
+	"testing"
+
+	"go.uber.org/zap"
+
+	"github.com/ShukeBta/MediaStationGo/internal/model"
+	"github.com/ShukeBta/MediaStationGo/internal/repository"
+)
+
+func TestEnqueueSiteSearchDedupMarksEnglishRangeAvailableForChineseSubscription(t *testing.T) {
+	db := newServiceTestDB(t, &model.DownloadTask{}, &model.Setting{})
+	repos := repository.New(db)
+	if err := repos.Download.Create(t.Context(), &model.DownloadTask{
+		UserID:   "u1",
+		Source:   "qbittorrent",
+		URL:      "https://pt.example/download?id=old",
+		Title:    "Archives The Nanyang Mystery 2026 S01E07-S01E08 2160p WEB-DL",
+		SavePath: "/downloads/国产剧",
+		Status:   "queued",
+		Progress: 0.1,
+	}); err != nil {
+		t.Fatal(err)
+	}
+
+	site := NewSiteService(zap.NewNop(), repos, "")
+	downloads := NewDownloadService(zap.NewNop(), repos, NewHub(zap.NewNop()), nil)
+	svc := NewSubscriptionService(nil, zap.NewNop(), repos, downloads, site, NewHub(zap.NewNop()))
+	sub := &model.Subscription{
+		Base:          model.Base{ID: "sub-nanyang"},
+		UserID:        "u1",
+		Name:          "南部档案 自动订阅",
+		Filter:        "南部档案 2026",
+		MediaType:     "tv",
+		MediaCategory: "国产剧",
+		SavePath:      "/downloads",
+		TotalEpisodes: 33,
+	}
+	state := &siteSearchRunState{
+		Keyword: "南部档案 2026",
+		SeenSet: map[string]struct{}{},
+		Availability: LocalAvailability{
+			TotalEpisodes:       33,
+			ExistingEpisodeKeys: map[string]struct{}{},
+			MissingEpisodeKeys:  map[string]struct{}{},
+		},
+	}
+	candidate := siteSearchCandidate{
+		Item: SearchResult{
+			Title:       "Archives The Nanyang Mystery 2026 S01E07-S01E08 2160p WEB-DL",
+			DownloadURL: "https://pt.example/download?id=new",
+		},
+		Download: "https://pt.example/download?id=new",
+		GUID:     "site|m-team|nanyang-7-8",
+		Season:   1,
+		Episode:  7,
+		Episodes: []int{7, 8},
+		Pack:     true,
+	}
+
+	title, err := svc.enqueueSiteSearchCandidate(t.Context(), sub, candidate, state)
+	if err != nil {
+		t.Fatalf("enqueueSiteSearchCandidate returned %v, want dedup skip without error", err)
+	}
+	if title != "" {
+		t.Fatalf("title = %q, want empty because candidate was deduped", title)
+	}
+	for _, episode := range []int{7, 8} {
+		if _, ok := state.Availability.ExistingEpisodeKeys[episodeKey(1, episode)]; !ok {
+			t.Fatalf("availability missing E%d after dedup range: %#v", episode, state.Availability.ExistingEpisodeKeys)
+		}
+	}
+	if _, ok := state.SeenSet[candidate.GUID]; !ok {
+		t.Fatalf("seen set missing candidate guid after dedup")
+	}
+}