Enrich MonitorAlbum response, prevent duplicate downloads, recover orphaned jobs on startup

internal/workers/poll_download.go

@@ -115,6 +115,36 @@ func (w *PollDownloadWorker) reschedule(ctx context.Context, args PollDownloadAr
 	return nil
 }
 
+func (w *PollDownloadWorker) RecoverOrphanedDownloads(ctx context.Context) {
+	active, err := w.Downloads.GetActive(ctx)
+	if err != nil {
+		log.Error().Err(err).Msg("failed to query active downloads for recovery")
+		return
+	}
+
+	if len(active) == 0 {
+		return
+	}
+
+	for _, d := range active {
+		_, err := w.RiverClient.Insert(ctx, PollDownloadArgs{
+			DownloadID:    d.ID,
+			TorrentHash:   d.QbitHash,
+			CheckInterval: 30 * time.Second,
+		}, &river.InsertOpts{
+			ScheduledAt: time.Now().Add(5 * time.Second),
+			UniqueOpts: river.UniqueOpts{
+				ByArgs: true,
+			},
+		})
+		if err != nil {
+			log.Error().Err(err).Str("download_id", d.ID).Msg("failed to reschedule orphaned download")
+		} else {
+			log.Info().Str("download_id", d.ID).Str("hash", d.QbitHash).Msg("recovered orphaned download poll job")
+		}
+	}
+}
+
 var audioExtensions = map[string]bool{
 	".flac": true, ".mp3": true, ".aac": true, ".m4a": true,
 	".ape": true, ".wv": true, ".ogg": true, ".wav": true, ".alac": true,