处理删库重建库没有媒体数据bug

本地文件入库媒体库删除后重新入库导致0条目bug

internal/service/media_cloud_test.go

@@ -51,6 +51,13 @@ func TestDeleteLibraryHardDeletesLibraryRoots(t *testing.T) {
 	if visibleLibraryCount != 0 {
 		t.Fatalf("deleted library should not remain visible, count=%d", visibleLibraryCount)
 	}
+	var mediaCount int64
+	if err := db.Unscoped().Model(&model.Media{}).Where("library_id = ?", lib.ID).Count(&mediaCount).Error; err != nil {
+		t.Fatal(err)
+	}
+	if mediaCount != 0 {
+		t.Fatalf("local library media rows should be hard deleted, count=%d", mediaCount)
+	}
 }
 
 func TestDeleteCloudLibraryPurgesMountWithoutRecycleBin(t *testing.T) {

internal/service/media_library.go

@@ -37,7 +37,10 @@ func (s *MediaService) DeleteLibrary(ctx context.Context, id string) error {
 		}
 	}
 	err = s.repo.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
-		if err := tx.Where("library_id = ?", id).Delete(&model.Media{}).Error; err != nil {
+		// 本地库媒体行统一硬删除（与云库分支一致）：删库即彻底清空该库的
+		// media 行，避免重扫时旧行被 upsert 复活却仍挂在已删库下，导致重建
+		// 同名库后条目始终为 0。只作用于数据库表行，磁盘文件不受影响。
+		if err := tx.Unscoped().Where("library_id = ?", id).Delete(&model.Media{}).Error; err != nil {
 			return err
 		}
 		if err := hardDeleteLibraryRoots(ctx, tx, id); err != nil {