feat(admin): transfer user accounts and show local cover coverage

services/api/internal/library/cover_stats.go

@@ -0,0 +1,49 @@
+package library
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/google/uuid"
+
+	"pipu/api/internal/api/gen"
+)
+
+type CoverStats struct {
+	FilesTotal     int64
+	FilesWithCover int64
+	AlbumsPending  int64
+}
+
+// SourceCoverStats counts physical audio files, including alternate encodings.
+// Only completed local covers count; external image URLs are intentionally ignored.
+func (st *Store) SourceCoverStats(ctx context.Context, id uuid.UUID) (CoverStats, error) {
+	var stats CoverStats
+	err := st.pool.QueryRow(ctx, `
+		SELECT count(*), count(*) FILTER (WHERE al.cover_path IS NOT NULL),
+			count(DISTINCT al.id) FILTER (WHERE al.cover_checked_at IS NULL)
+		FROM media_files mf
+		JOIN library_sources s ON s.id = mf.source_id
+		LEFT JOIN tracks t ON t.id = mf.track_id
+		LEFT JOIN albums al ON al.id = t.album_id
+		WHERE mf.source_id = $1 AND mf.missing_since IS NULL AND mf.scan_error IS NULL
+			AND NOT library_path_excluded(mf.rel_path, s.excluded_dirs)`, id).
+		Scan(&stats.FilesTotal, &stats.FilesWithCover, &stats.AlbumsPending)
+	if err != nil {
+		return CoverStats{}, fmt.Errorf("library: source cover stats: %w", err)
+	}
+	return stats, nil
+}
+
+func (h *Handler) GetSourceCoverStats(ctx context.Context, req gen.GetSourceCoverStatsRequestObject) (gen.GetSourceCoverStatsResponseObject, error) {
+	if _, err := h.svc.GetSource(ctx, req.Id); err != nil {
+		return nil, err
+	}
+	stats, err := h.store.SourceCoverStats(ctx, req.Id)
+	if err != nil {
+		return nil, err
+	}
+	return gen.GetSourceCoverStats200JSONResponse{
+		FilesTotal: stats.FilesTotal, FilesWithCover: stats.FilesWithCover, AlbumsPending: stats.AlbumsPending,
+	}, nil
+}