Refactor blob storage to use UUID primary keys and implement streaming chunking

- Changed blob table to use ID (UUID) as primary key instead of hash
- Blob records are now created at packing start, enabling immediate chunk associations
- Implemented streaming chunking to process large files without memory exhaustion
- Fixed blob manifest generation to include all referenced blobs
- Updated all foreign key references from blob_hash to blob_id
- Added progress reporting and improved error handling
- Enforced encryption requirement for all blob packing
- Updated tests to use test encryption keys
- Added Cyrillic transliteration to README

internal/database/repositories.go

@@ -15,6 +15,7 @@ type Repositories struct {
 	BlobChunks *BlobChunkRepository
 	ChunkFiles *ChunkFileRepository
 	Snapshots  *SnapshotRepository
+	Uploads    *UploadRepository
 }
 
 func NewRepositories(db *DB) *Repositories {
@@ -27,6 +28,7 @@ func NewRepositories(db *DB) *Repositories {
 		BlobChunks: NewBlobChunkRepository(db),
 		ChunkFiles: NewChunkFileRepository(db),
 		Snapshots:  NewSnapshotRepository(db),
+		Uploads:    NewUploadRepository(db.conn),
 	}
 }
 
@@ -34,13 +36,19 @@ type TxFunc func(ctx context.Context, tx *sql.Tx) error
 
 func (r *Repositories) WithTx(ctx context.Context, fn TxFunc) error {
 	// Acquire write lock for the entire transaction
+	LogSQL("WithTx", "Acquiring write lock", "")
 	r.db.LockForWrite()
-	defer r.db.UnlockWrite()
+	defer func() {
+		LogSQL("WithTx", "Releasing write lock", "")
+		r.db.UnlockWrite()
+	}()
 
+	LogSQL("WithTx", "Beginning transaction", "")
 	tx, err := r.db.BeginTx(ctx, nil)
 	if err != nil {
 		return fmt.Errorf("beginning transaction: %w", err)
 	}
+	LogSQL("WithTx", "Transaction started", "")
 
 	defer func() {
 		if p := recover(); p != nil {