feat(uploads): preview storage paths, detect templates, attach covers and withdraw batches

services/api/internal/dbtest/integration_test.go

@@ -158,11 +158,12 @@ func TestLibraryAndUploads(t *testing.T) {
 	assert.EqualValues(t, 1000, settings.QueueLimitBytes)
 
 	fresh := sha256.Sum256([]byte("new file"))
+	coverPath := "covers/album.jpg"
 	batch, res, err := up.CreateBatch(ctx, author, nil, []uploads.NewFile{
 		{ClientID: "a", Name: "a.flac", Size: 400, SHA256: fresh[:]},
 		{ClientID: "dup", Name: "b.flac", Size: 100, SHA256: sum[:]}, // уже в библиотеке
 		{ClientID: "big", Name: "c.flac", Size: 900, SHA256: []byte("cccccccccccccccccccccccccccccccc")},
-	}, settings)
+	}, settings, &coverPath)
 	require.NoError(t, err)
 	assert.NotEqual(t, uuid.Nil, batch)
 	byClient := map[string]uploads.Reserved{}
@@ -183,6 +184,11 @@ func TestLibraryAndUploads(t *testing.T) {
 	next, err := up.NextWithStatus(ctx, uploads.StatusProcessing)
 	require.NoError(t, err)
 	assert.Equal(t, fileID, next.ID)
+	require.NotNil(t, next.CoverPath)
+	assert.Equal(t, coverPath, *next.CoverPath)
+	coverInUse, err := up.StagingInUse(ctx)
+	require.NoError(t, err)
+	assert.True(t, coverInUse[coverPath], "active batch covers must survive staging reconciliation")
 	require.ErrorIs(t, up.Transition(ctx, fileID, []uploads.Status{uploads.StatusUploading}, uploads.StatusExpired, nil),
 		uploads.ErrWrongStatus)
 
@@ -190,7 +196,7 @@ func TestLibraryAndUploads(t *testing.T) {
 	require.NoError(t, up.Transition(ctx, fileID, []uploads.Status{uploads.StatusProcessing}, uploads.StatusPendingReview,
 		func(tx pgx.Tx) error {
 			_, err := tx.Exec(ctx, `UPDATE upload_files SET metadata = '{"artist":"Кино","album":"Группа крови","disc":2}',
-				fingerprint = '{1,2,3}', duration_ms = 200000 WHERE id = $1`, fileID)
+				fingerprint = '{1,2,3}', duration_ms = 200000, target_source_id = $2 WHERE id = $1`, fileID, src.ID)
 			return err
 		}))
 	f, err := up.File(ctx, fileID)
@@ -198,6 +204,8 @@ func TestLibraryAndUploads(t *testing.T) {
 	assert.Equal(t, uploads.StatusPendingReview, f.Status)
 	require.NotNil(t, f.Meta)
 	assert.Equal(t, "Кино", f.Meta.Artist)
+	require.NotNil(t, f.TargetSourceName)
+	assert.Equal(t, src.Name, *f.TargetSourceName)
 
 	files, nextCursor, err := up.List(ctx, uploads.ListFilter{AuthorID: &author, Statuses: []uploads.Status{uploads.StatusPendingReview}, Limit: 1})
 	require.NoError(t, err)
@@ -256,6 +264,10 @@ func TestLibraryAndUploads(t *testing.T) {
 	require.NoError(t, up.ChangeStatus(ctx, fileID, []uploads.Status{uploads.StatusApproved}, uploads.StatusImporting))
 	require.NoError(t, up.CompleteImport(ctx, fileID, src.ID, "Кино - Группа крови.flac", fileIDs[1]))
 	require.ErrorIs(t, up.CompleteImport(ctx, fileID, src.ID, "ignored.flac", fileIDs[1]), uploads.ErrWrongStatus)
+	unusedCover, err := up.UnusedBatchCover(ctx, batch)
+	require.NoError(t, err)
+	require.NotNil(t, unusedCover)
+	assert.Equal(t, coverPath, *unusedCover)
 
 	used, _, err = up.Usage(ctx, author)
 	require.NoError(t, err)
@@ -264,7 +276,7 @@ func TestLibraryAndUploads(t *testing.T) {
 	secondHash := sha256.Sum256([]byte("concurrent decision"))
 	_, reserved, err := up.CreateBatch(ctx, author, nil, []uploads.NewFile{
 		{ClientID: "race", Name: "race.flac", Size: 300, SHA256: secondHash[:]},
-	}, settings)
+	}, settings, nil)
 	require.NoError(t, err)
 	require.Len(t, reserved, 1)
 	raceID := reserved[0].FileID