Implement local SQLite index database with repositories

- Add SQLite database connection management with proper error handling
- Implement schema for files, chunks, blobs, and snapshots tables
- Create repository pattern for each database table
- Add transaction support with proper rollback handling
- Integrate database module with fx dependency injection
- Make index path configurable via VAULTIK_INDEX_PATH env var
- Add fatal error handling for database integrity issues
- Update DESIGN.md to clarify file_chunks vs chunk_files distinction
- Remove FinalHash from BlobInfo (blobs are content-addressable)
- Add file metadata support (mtime, ctime, mode, uid, gid, symlinks)

internal/models/models.go

@@ -27,8 +27,7 @@ type ChunkRef struct {
 
 // BlobInfo represents an encrypted blob containing multiple chunks
 type BlobInfo struct {
-	Hash       string    // Hash of encrypted blob
-	FinalHash  string    // Hash after compression and encryption
+	Hash       string // SHA256 hash of the blob content (content-addressable)
 	CreatedAt  time.Time
 	Size       int64
 	ChunkCount int
@@ -36,7 +35,7 @@ type BlobInfo struct {
 
 // Snapshot represents a backup snapshot
 type Snapshot struct {
-	ID           string    // ISO8601 timestamp
+	ID           string // ISO8601 timestamp
 	Hostname     string
 	Version      string
 	CreatedAt    time.Time
@@ -70,4 +69,4 @@ type DirtyPath struct {
 	Path      string
 	MarkedAt  time.Time
 	EventType string // "create", "modify", "delete"
-}
+}

internal/models/models_test.go

@@ -9,7 +9,7 @@ import (
 func TestModelsCompilation(t *testing.T) {
 	// This test primarily serves as a compilation test
 	// to ensure all types are properly defined
-	
+
 	// Test FileInfo
 	fi := &FileInfo{
 		Path:  "/test/file.txt",
@@ -19,7 +19,7 @@ func TestModelsCompilation(t *testing.T) {
 	if fi.Path != "/test/file.txt" {
 		t.Errorf("FileInfo.Path not set correctly")
 	}
-	
+
 	// Test ChunkInfo
 	ci := &ChunkInfo{
 		Hash:   "abc123",
@@ -29,11 +29,10 @@ func TestModelsCompilation(t *testing.T) {
 	if ci.Hash != "abc123" {
 		t.Errorf("ChunkInfo.Hash not set correctly")
 	}
-	
+
 	// Test BlobInfo
 	bi := &BlobInfo{
 		Hash:       "blob123",
-		FinalHash:  "final123",
 		CreatedAt:  time.Now(),
 		Size:       1024,
 		ChunkCount: 2,
@@ -41,7 +40,7 @@ func TestModelsCompilation(t *testing.T) {
 	if bi.Hash != "blob123" {
 		t.Errorf("BlobInfo.Hash not set correctly")
 	}
-	
+
 	// Test Snapshot
 	s := &Snapshot{
 		ID:        "2024-01-01T00:00:00Z",
@@ -52,4 +51,4 @@ func TestModelsCompilation(t *testing.T) {
 	if s.ID != "2024-01-01T00:00:00Z" {
 		t.Errorf("Snapshot.ID not set correctly")
 	}
-}
+}