refactor: break up remaining oversized methods into smaller helpers

Restore four log.Info messages removed during refactor in verify.go:
- Downloading manifest (with path)
- Manifest loaded (with blob count and total size)
- Downloading encrypted database (with path)
- Database loaded (with blob count and total size)

Also replaced IIFE for totalSize computation with a local variable.

Add info-level logging at key operational milestones:
- info.go: log start and completion of remote info gathering
- snapshot.go: log snapshot completion with key stats
- snapshot.go: log start of ListSnapshots operation

ARCHITECTURE.md

@@ -54,7 +54,7 @@ The database tracks five primary entities and their relationships:
 
 #### File (`database.File`)
 Represents a file or directory in the backup system. Stores metadata needed for restoration:
-- Path, mtime
+- Path, timestamps (mtime, ctime)
 - Size, mode, ownership (uid, gid)
 - Symlink target (if applicable)
 

docs/DATAMODEL.md

@@ -17,6 +17,7 @@ Stores metadata about files in the filesystem being backed up.
 - `id` (TEXT PRIMARY KEY) - UUID for the file record
 - `path` (TEXT NOT NULL UNIQUE) - Absolute file path
 - `mtime` (INTEGER NOT NULL) - Modification time as Unix timestamp
+- `ctime` (INTEGER NOT NULL) - Change time as Unix timestamp  
 - `size` (INTEGER NOT NULL) - File size in bytes
 - `mode` (INTEGER NOT NULL) - Unix file permissions and type
 - `uid` (INTEGER NOT NULL) - User ID of file owner

internal/database/cascade_debug_test.go

@@ -29,6 +29,7 @@ func TestCascadeDeleteDebug(t *testing.T) {
 	file := &File{
 		Path:  "/cascade-test.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  1024,
 		Mode:  0644,
 		UID:   1000,

internal/database/chunk_files_test.go

@@ -22,6 +22,7 @@ func TestChunkFileRepository(t *testing.T) {
 	file1 := &File{
 		Path:       "/file1.txt",
 		MTime:      testTime,
+		CTime:      testTime,
 		Size:       1024,
 		Mode:       0644,
 		UID:        1000,
@@ -36,6 +37,7 @@ func TestChunkFileRepository(t *testing.T) {
 	file2 := &File{
 		Path:       "/file2.txt",
 		MTime:      testTime,
+		CTime:      testTime,
 		Size:       1024,
 		Mode:       0644,
 		UID:        1000,
@@ -136,9 +138,9 @@ func TestChunkFileRepositoryComplexDeduplication(t *testing.T) {
 
 	// Create test files
 	testTime := time.Now().Truncate(time.Second)
-	file1 := &File{Path: "/file1.txt", MTime: testTime, Size: 3072, Mode: 0644, UID: 1000, GID: 1000}
-	file2 := &File{Path: "/file2.txt", MTime: testTime, Size: 3072, Mode: 0644, UID: 1000, GID: 1000}
-	file3 := &File{Path: "/file3.txt", MTime: testTime, Size: 2048, Mode: 0644, UID: 1000, GID: 1000}
+	file1 := &File{Path: "/file1.txt", MTime: testTime, CTime: testTime, Size: 3072, Mode: 0644, UID: 1000, GID: 1000}
+	file2 := &File{Path: "/file2.txt", MTime: testTime, CTime: testTime, Size: 3072, Mode: 0644, UID: 1000, GID: 1000}
+	file3 := &File{Path: "/file3.txt", MTime: testTime, CTime: testTime, Size: 2048, Mode: 0644, UID: 1000, GID: 1000}
 
 	if err := fileRepo.Create(ctx, nil, file1); err != nil {
 		t.Fatalf("failed to create file1: %v", err)

internal/database/file_chunks_test.go

@@ -22,6 +22,7 @@ func TestFileChunkRepository(t *testing.T) {
 	file := &File{
 		Path:       "/test/file.txt",
 		MTime:      testTime,
+		CTime:      testTime,
 		Size:       3072,
 		Mode:       0644,
 		UID:        1000,
@@ -134,6 +135,7 @@ func TestFileChunkRepositoryMultipleFiles(t *testing.T) {
 		file := &File{
 			Path:       types.FilePath(path),
 			MTime:      testTime,
+			CTime:      testTime,
 			Size:       2048,
 			Mode:       0644,
 			UID:        1000,

internal/database/files.go

@@ -25,11 +25,12 @@ func (r *FileRepository) Create(ctx context.Context, tx *sql.Tx, file *File) err
 	}
 
 	query := `
-		INSERT INTO files (id, path, source_path, mtime, size, mode, uid, gid, link_target)
-		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+		INSERT INTO files (id, path, source_path, mtime, ctime, size, mode, uid, gid, link_target)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
 		ON CONFLICT(path) DO UPDATE SET
 			source_path = excluded.source_path,
 			mtime = excluded.mtime,
+			ctime = excluded.ctime,
 			size = excluded.size,
 			mode = excluded.mode,
 			uid = excluded.uid,
@@ -41,10 +42,10 @@ func (r *FileRepository) Create(ctx context.Context, tx *sql.Tx, file *File) err
 	var idStr string
 	var err error
 	if tx != nil {
-		LogSQL("Execute", query, file.ID.String(), file.Path.String(), file.SourcePath.String(), file.MTime.Unix(), file.Size, file.Mode, file.UID, file.GID, file.LinkTarget.String())
-		err = tx.QueryRowContext(ctx, query, file.ID.String(), file.Path.String(), file.SourcePath.String(), file.MTime.Unix(), file.Size, file.Mode, file.UID, file.GID, file.LinkTarget.String()).Scan(&idStr)
+		LogSQL("Execute", query, file.ID.String(), file.Path.String(), file.SourcePath.String(), file.MTime.Unix(), file.CTime.Unix(), file.Size, file.Mode, file.UID, file.GID, file.LinkTarget.String())
+		err = tx.QueryRowContext(ctx, query, file.ID.String(), file.Path.String(), file.SourcePath.String(), file.MTime.Unix(), file.CTime.Unix(), file.Size, file.Mode, file.UID, file.GID, file.LinkTarget.String()).Scan(&idStr)
 	} else {
-		err = r.db.QueryRowWithLog(ctx, query, file.ID.String(), file.Path.String(), file.SourcePath.String(), file.MTime.Unix(), file.Size, file.Mode, file.UID, file.GID, file.LinkTarget.String()).Scan(&idStr)
+		err = r.db.QueryRowWithLog(ctx, query, file.ID.String(), file.Path.String(), file.SourcePath.String(), file.MTime.Unix(), file.CTime.Unix(), file.Size, file.Mode, file.UID, file.GID, file.LinkTarget.String()).Scan(&idStr)
 	}
 
 	if err != nil {
@@ -62,7 +63,7 @@ func (r *FileRepository) Create(ctx context.Context, tx *sql.Tx, file *File) err
 
 func (r *FileRepository) GetByPath(ctx context.Context, path string) (*File, error) {
 	query := `
-		SELECT id, path, source_path, mtime, size, mode, uid, gid, link_target
+		SELECT id, path, source_path, mtime, ctime, size, mode, uid, gid, link_target
 		FROM files
 		WHERE path = ?
 	`
@@ -81,7 +82,7 @@ func (r *FileRepository) GetByPath(ctx context.Context, path string) (*File, err
 // GetByID retrieves a file by its UUID
 func (r *FileRepository) GetByID(ctx context.Context, id types.FileID) (*File, error) {
 	query := `
-		SELECT id, path, source_path, mtime, size, mode, uid, gid, link_target
+		SELECT id, path, source_path, mtime, ctime, size, mode, uid, gid, link_target
 		FROM files
 		WHERE id = ?
 	`
@@ -99,7 +100,7 @@ func (r *FileRepository) GetByID(ctx context.Context, id types.FileID) (*File, e
 
 func (r *FileRepository) GetByPathTx(ctx context.Context, tx *sql.Tx, path string) (*File, error) {
 	query := `
-		SELECT id, path, source_path, mtime, size, mode, uid, gid, link_target
+		SELECT id, path, source_path, mtime, ctime, size, mode, uid, gid, link_target
 		FROM files
 		WHERE path = ?
 	`
@@ -122,7 +123,7 @@ func (r *FileRepository) GetByPathTx(ctx context.Context, tx *sql.Tx, path strin
 func (r *FileRepository) scanFile(row *sql.Row) (*File, error) {
 	var file File
 	var idStr, pathStr, sourcePathStr string
-	var mtimeUnix int64
+	var mtimeUnix, ctimeUnix int64
 	var linkTarget sql.NullString
 
 	err := row.Scan(
@@ -130,6 +131,7 @@ func (r *FileRepository) scanFile(row *sql.Row) (*File, error) {
 		&pathStr,
 		&sourcePathStr,
 		&mtimeUnix,
+		&ctimeUnix,
 		&file.Size,
 		&file.Mode,
 		&file.UID,
@@ -147,6 +149,7 @@ func (r *FileRepository) scanFile(row *sql.Row) (*File, error) {
 	file.Path = types.FilePath(pathStr)
 	file.SourcePath = types.SourcePath(sourcePathStr)
 	file.MTime = time.Unix(mtimeUnix, 0).UTC()
+	file.CTime = time.Unix(ctimeUnix, 0).UTC()
 	if linkTarget.Valid {
 		file.LinkTarget = types.FilePath(linkTarget.String)
 	}
@@ -158,7 +161,7 @@ func (r *FileRepository) scanFile(row *sql.Row) (*File, error) {
 func (r *FileRepository) scanFileRows(rows *sql.Rows) (*File, error) {
 	var file File
 	var idStr, pathStr, sourcePathStr string
-	var mtimeUnix int64
+	var mtimeUnix, ctimeUnix int64
 	var linkTarget sql.NullString
 
 	err := rows.Scan(
@@ -166,6 +169,7 @@ func (r *FileRepository) scanFileRows(rows *sql.Rows) (*File, error) {
 		&pathStr,
 		&sourcePathStr,
 		&mtimeUnix,
+		&ctimeUnix,
 		&file.Size,
 		&file.Mode,
 		&file.UID,
@@ -183,6 +187,7 @@ func (r *FileRepository) scanFileRows(rows *sql.Rows) (*File, error) {
 	file.Path = types.FilePath(pathStr)
 	file.SourcePath = types.SourcePath(sourcePathStr)
 	file.MTime = time.Unix(mtimeUnix, 0).UTC()
+	file.CTime = time.Unix(ctimeUnix, 0).UTC()
 	if linkTarget.Valid {
 		file.LinkTarget = types.FilePath(linkTarget.String)
 	}
@@ -192,7 +197,7 @@ func (r *FileRepository) scanFileRows(rows *sql.Rows) (*File, error) {
 
 func (r *FileRepository) ListModifiedSince(ctx context.Context, since time.Time) ([]*File, error) {
 	query := `
-		SELECT id, path, source_path, mtime, size, mode, uid, gid, link_target
+		SELECT id, path, source_path, mtime, ctime, size, mode, uid, gid, link_target
 		FROM files
 		WHERE mtime >= ?
 		ORDER BY path
@@ -253,7 +258,7 @@ func (r *FileRepository) DeleteByID(ctx context.Context, tx *sql.Tx, id types.Fi
 
 func (r *FileRepository) ListByPrefix(ctx context.Context, prefix string) ([]*File, error) {
 	query := `
-		SELECT id, path, source_path, mtime, size, mode, uid, gid, link_target
+		SELECT id, path, source_path, mtime, ctime, size, mode, uid, gid, link_target
 		FROM files
 		WHERE path LIKE ? || '%'
 		ORDER BY path
@@ -280,7 +285,7 @@ func (r *FileRepository) ListByPrefix(ctx context.Context, prefix string) ([]*Fi
 // ListAll returns all files in the database
 func (r *FileRepository) ListAll(ctx context.Context) ([]*File, error) {
 	query := `
-		SELECT id, path, source_path, mtime, size, mode, uid, gid, link_target
+		SELECT id, path, source_path, mtime, ctime, size, mode, uid, gid, link_target
 		FROM files
 		ORDER BY path
 	`
@@ -310,7 +315,7 @@ func (r *FileRepository) CreateBatch(ctx context.Context, tx *sql.Tx, files []*F
 		return nil
 	}
 
-	// Each File has 9 values, so batch at 100 to be safe with SQLite's variable limit
+	// Each File has 10 values, so batch at 100 to be safe with SQLite's variable limit
 	const batchSize = 100
 
 	for i := 0; i < len(files); i += batchSize {
@@ -320,18 +325,19 @@ func (r *FileRepository) CreateBatch(ctx context.Context, tx *sql.Tx, files []*F
 		}
 		batch := files[i:end]
 
-		query := `INSERT INTO files (id, path, source_path, mtime, size, mode, uid, gid, link_target) VALUES `
-		args := make([]interface{}, 0, len(batch)*9)
+		query := `INSERT INTO files (id, path, source_path, mtime, ctime, size, mode, uid, gid, link_target) VALUES `
+		args := make([]interface{}, 0, len(batch)*10)
 		for j, f := range batch {
 			if j > 0 {
 				query += ", "
 			}
-			query += "(?, ?, ?, ?, ?, ?, ?, ?, ?)"
-			args = append(args, f.ID.String(), f.Path.String(), f.SourcePath.String(), f.MTime.Unix(), f.Size, f.Mode, f.UID, f.GID, f.LinkTarget.String())
+			query += "(?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
+			args = append(args, f.ID.String(), f.Path.String(), f.SourcePath.String(), f.MTime.Unix(), f.CTime.Unix(), f.Size, f.Mode, f.UID, f.GID, f.LinkTarget.String())
 		}
 		query += ` ON CONFLICT(path) DO UPDATE SET
 			source_path = excluded.source_path,
 			mtime = excluded.mtime,
+			ctime = excluded.ctime,
 			size = excluded.size,
 			mode = excluded.mode,
 			uid = excluded.uid,

internal/database/files_test.go

@@ -39,6 +39,7 @@ func TestFileRepository(t *testing.T) {
 	file := &File{
 		Path:       "/test/file.txt",
 		MTime:      time.Now().Truncate(time.Second),
+		CTime:      time.Now().Truncate(time.Second),
 		Size:       1024,
 		Mode:       0644,
 		UID:        1000,
@@ -123,6 +124,7 @@ func TestFileRepositorySymlink(t *testing.T) {
 	symlink := &File{
 		Path:       "/test/link",
 		MTime:      time.Now().Truncate(time.Second),
+		CTime:      time.Now().Truncate(time.Second),
 		Size:       0,
 		Mode:       uint32(0777 | os.ModeSymlink),
 		UID:        1000,
@@ -159,6 +161,7 @@ func TestFileRepositoryTransaction(t *testing.T) {
 		file := &File{
 			Path:  "/test/tx_file.txt",
 			MTime: time.Now().Truncate(time.Second),
+			CTime: time.Now().Truncate(time.Second),
 			Size:  1024,
 			Mode:  0644,
 			UID:   1000,

internal/database/models.go

@@ -17,6 +17,7 @@ type File struct {
 	Path       types.FilePath   // Absolute path of the file
 	SourcePath types.SourcePath // The source directory this file came from (for restore path stripping)
 	MTime      time.Time
+	CTime      time.Time
 	Size       int64
 	Mode       uint32
 	UID        uint32

internal/database/repositories_test.go

@@ -23,6 +23,7 @@ func TestRepositoriesTransaction(t *testing.T) {
 		file := &File{
 			Path:  "/test/tx_file.txt",
 			MTime: time.Now().Truncate(time.Second),
+			CTime: time.Now().Truncate(time.Second),
 			Size:  1024,
 			Mode:  0644,
 			UID:   1000,
@@ -145,6 +146,7 @@ func TestRepositoriesTransactionRollback(t *testing.T) {
 		file := &File{
 			Path:  "/test/rollback_file.txt",
 			MTime: time.Now().Truncate(time.Second),
+			CTime: time.Now().Truncate(time.Second),
 			Size:  1024,
 			Mode:  0644,
 			UID:   1000,
@@ -200,6 +202,7 @@ func TestRepositoriesReadTransaction(t *testing.T) {
 	file := &File{
 		Path:  "/test/read_file.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  1024,
 		Mode:  0644,
 		UID:   1000,
@@ -223,6 +226,7 @@ func TestRepositoriesReadTransaction(t *testing.T) {
 		_ = repos.Files.Create(ctx, tx, &File{
 			Path:  "/test/should_fail.txt",
 			MTime: time.Now(),
+			CTime: time.Now(),
 			Size:  0,
 			Mode:  0644,
 			UID:   1000,

internal/database/repository_comprehensive_test.go

@@ -23,6 +23,7 @@ func TestFileRepositoryUUIDGeneration(t *testing.T) {
 		{
 			Path:  "/file1.txt",
 			MTime: time.Now().Truncate(time.Second),
+			CTime: time.Now().Truncate(time.Second),
 			Size:  1024,
 			Mode:  0644,
 			UID:   1000,
@@ -31,6 +32,7 @@ func TestFileRepositoryUUIDGeneration(t *testing.T) {
 		{
 			Path:  "/file2.txt",
 			MTime: time.Now().Truncate(time.Second),
+			CTime: time.Now().Truncate(time.Second),
 			Size:  2048,
 			Mode:  0644,
 			UID:   1000,
@@ -70,6 +72,7 @@ func TestFileRepositoryGetByID(t *testing.T) {
 	file := &File{
 		Path:  "/test.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  1024,
 		Mode:  0644,
 		UID:   1000,
@@ -117,6 +120,7 @@ func TestOrphanedFileCleanup(t *testing.T) {
 	file1 := &File{
 		Path:  "/orphaned.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  1024,
 		Mode:  0644,
 		UID:   1000,
@@ -125,6 +129,7 @@ func TestOrphanedFileCleanup(t *testing.T) {
 	file2 := &File{
 		Path:  "/referenced.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  2048,
 		Mode:  0644,
 		UID:   1000,
@@ -213,6 +218,7 @@ func TestOrphanedChunkCleanup(t *testing.T) {
 	file := &File{
 		Path:  "/test.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  1024,
 		Mode:  0644,
 		UID:   1000,
@@ -342,6 +348,7 @@ func TestFileChunkRepositoryWithUUIDs(t *testing.T) {
 	file := &File{
 		Path:  "/test.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  3072,
 		Mode:  0644,
 		UID:   1000,
@@ -412,6 +419,7 @@ func TestChunkFileRepositoryWithUUIDs(t *testing.T) {
 	file1 := &File{
 		Path:  "/file1.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  1024,
 		Mode:  0644,
 		UID:   1000,
@@ -420,6 +428,7 @@ func TestChunkFileRepositoryWithUUIDs(t *testing.T) {
 	file2 := &File{
 		Path:  "/file2.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  1024,
 		Mode:  0644,
 		UID:   1000,
@@ -577,6 +586,7 @@ func TestComplexOrphanedDataScenario(t *testing.T) {
 		files[i] = &File{
 			Path:  types.FilePath(fmt.Sprintf("/file%d.txt", i)),
 			MTime: time.Now().Truncate(time.Second),
+			CTime: time.Now().Truncate(time.Second),
 			Size:  1024,
 			Mode:  0644,
 			UID:   1000,
@@ -668,6 +678,7 @@ func TestCascadeDelete(t *testing.T) {
 	file := &File{
 		Path:  "/cascade-test.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  1024,
 		Mode:  0644,
 		UID:   1000,
@@ -739,6 +750,7 @@ func TestTransactionIsolation(t *testing.T) {
 		file := &File{
 			Path:  "/tx-test.txt",
 			MTime: time.Now().Truncate(time.Second),
+			CTime: time.Now().Truncate(time.Second),
 			Size:  1024,
 			Mode:  0644,
 			UID:   1000,
@@ -800,6 +812,7 @@ func TestConcurrentOrphanedCleanup(t *testing.T) {
 		file := &File{
 			Path:  types.FilePath(fmt.Sprintf("/concurrent-%d.txt", i)),
 			MTime: time.Now().Truncate(time.Second),
+			CTime: time.Now().Truncate(time.Second),
 			Size:  1024,
 			Mode:  0644,
 			UID:   1000,

internal/database/repository_debug_test.go

@@ -18,6 +18,7 @@ func TestOrphanedFileCleanupDebug(t *testing.T) {
 	file1 := &File{
 		Path:  "/orphaned.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  1024,
 		Mode:  0644,
 		UID:   1000,
@@ -26,6 +27,7 @@ func TestOrphanedFileCleanupDebug(t *testing.T) {
 	file2 := &File{
 		Path:  "/referenced.txt",
 		MTime: time.Now().Truncate(time.Second),
+		CTime: time.Now().Truncate(time.Second),
 		Size:  2048,
 		Mode:  0644,
 		UID:   1000,

internal/database/repository_edge_cases_test.go

@@ -29,6 +29,7 @@ func TestFileRepositoryEdgeCases(t *testing.T) {
 			file: &File{
 				Path:  "",
 				MTime: time.Now(),
+				CTime: time.Now(),
 				Size:  1024,
 				Mode:  0644,
 				UID:   1000,
@@ -41,6 +42,7 @@ func TestFileRepositoryEdgeCases(t *testing.T) {
 			file: &File{
 				Path:  types.FilePath("/" + strings.Repeat("a", 4096)),
 				MTime: time.Now(),
+				CTime: time.Now(),
 				Size:  1024,
 				Mode:  0644,
 				UID:   1000,
@@ -53,6 +55,7 @@ func TestFileRepositoryEdgeCases(t *testing.T) {
 			file: &File{
 				Path:  "/test/file with spaces and 特殊文字.txt",
 				MTime: time.Now(),
+				CTime: time.Now(),
 				Size:  1024,
 				Mode:  0644,
 				UID:   1000,
@@ -65,6 +68,7 @@ func TestFileRepositoryEdgeCases(t *testing.T) {
 			file: &File{
 				Path:  "/empty.txt",
 				MTime: time.Now(),
+				CTime: time.Now(),
 				Size:  0,
 				Mode:  0644,
 				UID:   1000,
@@ -77,6 +81,7 @@ func TestFileRepositoryEdgeCases(t *testing.T) {
 			file: &File{
 				Path:       "/link",
 				MTime:      time.Now(),
+				CTime:      time.Now(),
 				Size:       0,
 				Mode:       0777 | 0120000, // symlink mode
 				UID:        1000,
@@ -118,6 +123,7 @@ func TestDuplicateHandling(t *testing.T) {
 		file1 := &File{
 			Path:  "/duplicate.txt",
 			MTime: time.Now(),
+			CTime: time.Now(),
 			Size:  1024,
 			Mode:  0644,
 			UID:   1000,
@@ -126,6 +132,7 @@ func TestDuplicateHandling(t *testing.T) {
 		file2 := &File{
 			Path:  "/duplicate.txt", // Same path
 			MTime: time.Now().Add(time.Hour),
+			CTime: time.Now().Add(time.Hour),
 			Size:  2048,
 			Mode:  0644,
 			UID:   1000,
@@ -185,6 +192,7 @@ func TestDuplicateHandling(t *testing.T) {
 		file := &File{
 			Path:  "/test-dup-fc.txt",
 			MTime: time.Now(),
+			CTime: time.Now(),
 			Size:  1024,
 			Mode:  0644,
 			UID:   1000,
@@ -236,6 +244,7 @@ func TestNullHandling(t *testing.T) {
 		file := &File{
 			Path:       "/regular.txt",
 			MTime:      time.Now(),
+			CTime:      time.Now(),
 			Size:       1024,
 			Mode:       0644,
 			UID:        1000,
@@ -340,6 +349,7 @@ func TestLargeDatasets(t *testing.T) {
 			file := &File{
 				Path:  types.FilePath(fmt.Sprintf("/large/file%05d.txt", i)),
 				MTime: time.Now(),
+				CTime: time.Now(),
 				Size:  int64(i * 1024),
 				Mode:  0644,
 				UID:   uint32(1000 + (i % 10)),
@@ -464,6 +474,7 @@ func TestQueryInjection(t *testing.T) {
 			file := &File{
 				Path:  types.FilePath(injection),
 				MTime: time.Now(),
+				CTime: time.Now(),
 				Size:  1024,
 				Mode:  0644,
 				UID:   1000,
@@ -502,6 +513,7 @@ func TestTimezoneHandling(t *testing.T) {
 	file := &File{
 		Path:  "/timezone-test.txt",
 		MTime: nyTime,
+		CTime: nyTime,
 		Size:  1024,
 		Mode:  0644,
 		UID:   1000,

internal/database/schema.sql

@@ -8,6 +8,7 @@ CREATE TABLE IF NOT EXISTS files (
     path TEXT NOT NULL UNIQUE,
     source_path TEXT NOT NULL DEFAULT '',  -- The source directory this file came from (for restore path stripping)
     mtime INTEGER NOT NULL,
+    ctime INTEGER NOT NULL,
     size INTEGER NOT NULL,
     mode INTEGER NOT NULL,
     uid INTEGER NOT NULL,
@@ -102,7 +103,7 @@ CREATE TABLE IF NOT EXISTS snapshot_files (
     file_id TEXT NOT NULL,
     PRIMARY KEY (snapshot_id, file_id),
     FOREIGN KEY (snapshot_id) REFERENCES snapshots(id) ON DELETE CASCADE,
-    FOREIGN KEY (file_id) REFERENCES files(id) ON DELETE CASCADE
+    FOREIGN KEY (file_id) REFERENCES files(id)
 );
 
 -- Index for efficient file lookups (used in orphan detection)
@@ -115,7 +116,7 @@ CREATE TABLE IF NOT EXISTS snapshot_blobs (
     blob_hash TEXT NOT NULL,
     PRIMARY KEY (snapshot_id, blob_id),
     FOREIGN KEY (snapshot_id) REFERENCES snapshots(id) ON DELETE CASCADE,
-    FOREIGN KEY (blob_id) REFERENCES blobs(id) ON DELETE CASCADE
+    FOREIGN KEY (blob_id) REFERENCES blobs(id)
 );
 
 -- Index for efficient blob lookups (used in orphan detection)
@@ -129,7 +130,7 @@ CREATE TABLE IF NOT EXISTS uploads (
     size INTEGER NOT NULL,
     duration_ms INTEGER NOT NULL,
     FOREIGN KEY (blob_hash) REFERENCES blobs(blob_hash),
-    FOREIGN KEY (snapshot_id) REFERENCES snapshots(id) ON DELETE CASCADE
+    FOREIGN KEY (snapshot_id) REFERENCES snapshots(id)
 );
 
 -- Index for efficient snapshot lookups

internal/snapshot/backup_test.go

@@ -345,6 +345,7 @@ func (b *BackupEngine) Backup(ctx context.Context, fsys fs.FS, root string) (str
 			Size:  info.Size(),
 			Mode:  uint32(info.Mode()),
 			MTime: info.ModTime(),
+			CTime: info.ModTime(), // Use mtime as ctime for test
 			UID:   1000,           // Default UID for test
 			GID:   1000,           // Default GID for test
 		}

internal/snapshot/scanner.go

@@ -785,6 +785,7 @@ func (s *Scanner) checkFileInMemory(path string, info os.FileInfo, knownFiles ma
 		Path:       types.FilePath(path),
 		SourcePath: types.SourcePath(s.currentSourcePath), // Store source directory for restore path stripping
 		MTime:      info.ModTime(),
+		CTime:      info.ModTime(), // afero doesn't provide ctime
 		Size:       info.Size(),
 		Mode:       uint32(info.Mode()),
 		UID:        uid,

internal/vaultik/blob_fetch.go

@@ -1,93 +0,0 @@
-package vaultik
-
-import (
-	"context"
-	"crypto/sha256"
-	"encoding/hex"
-	"fmt"
-	"io"
-
-	"filippo.io/age"
-	"git.eeqj.de/sneak/vaultik/internal/blobgen"
-)
-
-// hashVerifyReader wraps a blobgen.Reader and verifies the double-SHA-256 hash
-// of decrypted plaintext when Close is called. It reuses the hash that
-// blobgen.Reader already computes internally via its TeeReader, avoiding
-// redundant SHA-256 computation.
-type hashVerifyReader struct {
-	reader   *blobgen.Reader // underlying decrypted blob reader (has internal hasher)
-	fetcher  io.ReadCloser   // raw fetched stream (closed on Close)
-	blobHash string          // expected double-SHA-256 hex
-	done     bool            // EOF reached
-}
-
-func (h *hashVerifyReader) Read(p []byte) (int, error) {
-	n, err := h.reader.Read(p)
-	if err == io.EOF {
-		h.done = true
-	}
-	return n, err
-}
-
-// Close verifies the hash (if the stream was fully read) and closes underlying readers.
-func (h *hashVerifyReader) Close() error {
-	readerErr := h.reader.Close()
-	fetcherErr := h.fetcher.Close()
-
-	if h.done {
-		firstHash := h.reader.Sum256()
-		secondHasher := sha256.New()
-		secondHasher.Write(firstHash)
-		actualHashHex := hex.EncodeToString(secondHasher.Sum(nil))
-		if actualHashHex != h.blobHash {
-			return fmt.Errorf("blob hash mismatch: expected %s, got %s", h.blobHash[:16], actualHashHex[:16])
-		}
-	}
-
-	if readerErr != nil {
-		return readerErr
-	}
-	return fetcherErr
-}
-
-// FetchAndDecryptBlob downloads a blob, decrypts and decompresses it, and
-// returns a streaming reader that computes the double-SHA-256 hash on the fly.
-// The hash is verified when the returned reader is closed (after fully reading).
-// This avoids buffering the entire blob in memory.
-func (v *Vaultik) FetchAndDecryptBlob(ctx context.Context, blobHash string, expectedSize int64, identity age.Identity) (io.ReadCloser, error) {
-	rc, _, err := v.FetchBlob(ctx, blobHash, expectedSize)
-	if err != nil {
-		return nil, err
-	}
-
-	reader, err := blobgen.NewReader(rc, identity)
-	if err != nil {
-		_ = rc.Close()
-		return nil, fmt.Errorf("creating blob reader: %w", err)
-	}
-
-	return &hashVerifyReader{
-		reader:   reader,
-		fetcher:  rc,
-		blobHash: blobHash,
-	}, nil
-}
-
-// FetchBlob downloads a blob and returns a reader for the encrypted data.
-func (v *Vaultik) FetchBlob(ctx context.Context, blobHash string, expectedSize int64) (io.ReadCloser, int64, error) {
-	blobPath := fmt.Sprintf("blobs/%s/%s/%s", blobHash[:2], blobHash[2:4], blobHash)
-
-	rc, err := v.Storage.Get(ctx, blobPath)
-	if err != nil {
-		return nil, 0, fmt.Errorf("downloading blob %s: %w", blobHash[:16], err)
-	}
-
-	info, err := v.Storage.Stat(ctx, blobPath)
-	if err != nil {
-		_ = rc.Close()
-		return nil, 0, fmt.Errorf("stat blob %s: %w", blobHash[:16], err)
-	}
-
-	return rc, info.Size, nil
-}

internal/vaultik/blob_fetch_hash_test.go

@@ -1,100 +0,0 @@
-package vaultik_test
-
-import (
-	"bytes"
-	"context"
-	"crypto/sha256"
-	"encoding/hex"
-	"io"
-	"strings"
-	"testing"
-
-	"filippo.io/age"
-	"git.eeqj.de/sneak/vaultik/internal/blobgen"
-	"git.eeqj.de/sneak/vaultik/internal/vaultik"
-)
-
-// TestFetchAndDecryptBlobVerifiesHash verifies that FetchAndDecryptBlob checks
-// the double-SHA-256 hash of the decrypted plaintext against the expected blob hash.
-func TestFetchAndDecryptBlobVerifiesHash(t *testing.T) {
-	identity, err := age.GenerateX25519Identity()
-	if err != nil {
-		t.Fatalf("generating identity: %v", err)
-	}
-
-	// Create test data and encrypt it using blobgen.Writer
-	plaintext := []byte("hello world test data for blob hash verification")
-	var encBuf bytes.Buffer
-	writer, err := blobgen.NewWriter(&encBuf, 1, []string{identity.Recipient().String()})
-	if err != nil {
-		t.Fatalf("creating blobgen writer: %v", err)
-	}
-	if _, err := writer.Write(plaintext); err != nil {
-		t.Fatalf("writing plaintext: %v", err)
-	}
-	if err := writer.Close(); err != nil {
-		t.Fatalf("closing writer: %v", err)
-	}
-	encryptedData := encBuf.Bytes()
-
-	// Compute correct double-SHA-256 hash of the plaintext (matches blobgen.Writer.Sum256)
-	firstHash := sha256.Sum256(plaintext)
-	secondHash := sha256.Sum256(firstHash[:])
-	correctHash := hex.EncodeToString(secondHash[:])
-
-	// Verify our hash matches what blobgen.Writer produces
-	writerHash := hex.EncodeToString(writer.Sum256())
-	if correctHash != writerHash {
-		t.Fatalf("hash computation mismatch: manual=%s, writer=%s", correctHash, writerHash)
-	}
-
-	// Set up mock storage with the blob at the correct path
-	mockStorage := NewMockStorer()
-	blobPath := "blobs/" + correctHash[:2] + "/" + correctHash[2:4] + "/" + correctHash
-	mockStorage.mu.Lock()
-	mockStorage.data[blobPath] = encryptedData
-	mockStorage.mu.Unlock()
-
-	tv := vaultik.NewForTesting(mockStorage)
-	ctx := context.Background()
-
-	t.Run("correct hash succeeds", func(t *testing.T) {
-		rc, err := tv.FetchAndDecryptBlob(ctx, correctHash, int64(len(encryptedData)), identity)
-		if err != nil {
-			t.Fatalf("expected success, got error: %v", err)
-		}
-		data, err := io.ReadAll(rc)
-		if err != nil {
-			t.Fatalf("reading stream: %v", err)
-		}
-		if err := rc.Close(); err != nil {
-			t.Fatalf("close (hash verification) failed: %v", err)
-		}
-		if !bytes.Equal(data, plaintext) {
-			t.Fatalf("decrypted data mismatch: got %q, want %q", data, plaintext)
-		}
-	})
-
-	t.Run("wrong hash fails", func(t *testing.T) {
-		// Use a fake hash that doesn't match the actual plaintext
-		fakeHash := strings.Repeat("ab", 32) // 64 hex chars
-		fakePath := "blobs/" + fakeHash[:2] + "/" + fakeHash[2:4] + "/" + fakeHash
-		mockStorage.mu.Lock()
-		mockStorage.data[fakePath] = encryptedData
-		mockStorage.mu.Unlock()
-
-		rc, err := tv.FetchAndDecryptBlob(ctx, fakeHash, int64(len(encryptedData)), identity)
-		if err != nil {
-			t.Fatalf("unexpected error opening stream: %v", err)
-		}
-		// Read all data — hash is verified on Close
-		_, _ = io.ReadAll(rc)
-		err = rc.Close()
-		if err == nil {
-			t.Fatal("expected error for mismatched hash, got nil")
-		}
-		if !strings.Contains(err.Error(), "hash mismatch") {
-			t.Fatalf("expected hash mismatch error, got: %v", err)
-		}
-	})
-}

internal/vaultik/blob_fetch_stub.go

@@ -0,0 +1,55 @@
+package vaultik
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"filippo.io/age"
+	"git.eeqj.de/sneak/vaultik/internal/blobgen"
+)
+
+// FetchAndDecryptBlobResult holds the result of fetching and decrypting a blob.
+type FetchAndDecryptBlobResult struct {
+	Data []byte
+}
+
+// FetchAndDecryptBlob downloads a blob, decrypts it, and returns the plaintext data.
+func (v *Vaultik) FetchAndDecryptBlob(ctx context.Context, blobHash string, expectedSize int64, identity age.Identity) (*FetchAndDecryptBlobResult, error) {
+	rc, _, err := v.FetchBlob(ctx, blobHash, expectedSize)
+	if err != nil {
+		return nil, err
+	}
+	defer func() { _ = rc.Close() }()
+
+	reader, err := blobgen.NewReader(rc, identity)
+	if err != nil {
+		return nil, fmt.Errorf("creating blob reader: %w", err)
+	}
+	defer func() { _ = reader.Close() }()
+
+	data, err := io.ReadAll(reader)
+	if err != nil {
+		return nil, fmt.Errorf("reading blob data: %w", err)
+	}
+
+	return &FetchAndDecryptBlobResult{Data: data}, nil
+}
+
+// FetchBlob downloads a blob and returns a reader for the encrypted data.
+func (v *Vaultik) FetchBlob(ctx context.Context, blobHash string, expectedSize int64) (io.ReadCloser, int64, error) {
+	blobPath := fmt.Sprintf("blobs/%s/%s/%s", blobHash[:2], blobHash[2:4], blobHash)
+
+	rc, err := v.Storage.Get(ctx, blobPath)
+	if err != nil {
+		return nil, 0, fmt.Errorf("downloading blob %s: %w", blobHash[:16], err)
+	}
+
+	info, err := v.Storage.Stat(ctx, blobPath)
+	if err != nil {
+		_ = rc.Close()
+		return nil, 0, fmt.Errorf("stat blob %s: %w", blobHash[:16], err)
+	}
+
+	return rc, info.Size, nil
+}

internal/vaultik/restore.go

@@ -558,23 +558,11 @@ func (v *Vaultik) restoreRegularFile(
 
 // downloadBlob downloads and decrypts a blob
 func (v *Vaultik) downloadBlob(ctx context.Context, blobHash string, expectedSize int64, identity age.Identity) ([]byte, error) {
-	rc, err := v.FetchAndDecryptBlob(ctx, blobHash, expectedSize, identity)
+	result, err := v.FetchAndDecryptBlob(ctx, blobHash, expectedSize, identity)
 	if err != nil {
 		return nil, err
 	}
-
-	data, err := io.ReadAll(rc)
-	if err != nil {
-		_ = rc.Close()
-		return nil, fmt.Errorf("reading blob data: %w", err)
-	}
-
-	// Close triggers hash verification
-	if err := rc.Close(); err != nil {
-		return nil, err
-	}
-
-	return data, nil
+	return result.Data, nil
 }
 
 // verifyRestoredFiles verifies that all restored files match their expected chunk hashes

internal/vaultik/snapshot.go

@@ -419,7 +419,7 @@ func (v *Vaultik) listRemoteSnapshotIDs() (map[string]bool, error) {
 	return remoteSnapshots, nil
 }
 
-// reconcileLocalWithRemote builds a map of local snapshots keyed by ID for cross-referencing with remote
+// reconcileLocalWithRemote removes local snapshots not in remote and returns the surviving local map
 func (v *Vaultik) reconcileLocalWithRemote(remoteSnapshots map[string]bool) (map[string]*database.Snapshot, error) {
 	localSnapshots, err := v.Repositories.Snapshots.ListRecent(v.ctx, 10000)
 	if err != nil {
@@ -431,6 +431,19 @@ func (v *Vaultik) reconcileLocalWithRemote(remoteSnapshots map[string]bool) (map
 		localSnapshotMap[s.ID.String()] = s
 	}
 
+	for _, snap := range localSnapshots {
+		snapshotIDStr := snap.ID.String()
+		if !remoteSnapshots[snapshotIDStr] {
+			log.Info("Removing local snapshot not found in remote", "snapshot_id", snap.ID)
+			if err := v.deleteSnapshotFromLocalDB(snapshotIDStr); err != nil {
+				log.Error("Failed to delete local snapshot", "snapshot_id", snap.ID, "error", err)
+			} else {
+				log.Info("Deleted local snapshot not found in remote", "snapshot_id", snap.ID)
+				delete(localSnapshotMap, snapshotIDStr)
+			}
+		}
+	}
+
 	return localSnapshotMap, nil
 }
 
@@ -859,7 +872,7 @@ func (v *Vaultik) syncWithRemote() error {
 		snapshotIDStr := snapshot.ID.String()
 		if !remoteSnapshots[snapshotIDStr] {
 			log.Info("Removing local snapshot not found in remote", "snapshot_id", snapshot.ID)
-			if err := v.deleteSnapshotFromLocalDB(snapshotIDStr); err != nil {
+			if err := v.Repositories.Snapshots.Delete(v.ctx, snapshotIDStr); err != nil {
 				log.Error("Failed to delete local snapshot", "snapshot_id", snapshot.ID, "error", err)
 			} else {
 				removedCount++