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/uploads.go

@@ -0,0 +1,135 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"time"
+
+	"git.eeqj.de/sneak/vaultik/internal/log"
+)
+
+// Upload represents a blob upload record
+type Upload struct {
+	BlobHash   string
+	UploadedAt time.Time
+	Size       int64
+	DurationMs int64
+}
+
+// UploadRepository handles upload records
+type UploadRepository struct {
+	conn *sql.DB
+}
+
+// NewUploadRepository creates a new upload repository
+func NewUploadRepository(conn *sql.DB) *UploadRepository {
+	return &UploadRepository{conn: conn}
+}
+
+// Create inserts a new upload record
+func (r *UploadRepository) Create(ctx context.Context, tx *sql.Tx, upload *Upload) error {
+	query := `
+		INSERT INTO uploads (blob_hash, uploaded_at, size, duration_ms)
+		VALUES (?, ?, ?, ?)
+	`
+
+	var err error
+	if tx != nil {
+		_, err = tx.ExecContext(ctx, query, upload.BlobHash, upload.UploadedAt, upload.Size, upload.DurationMs)
+	} else {
+		_, err = r.conn.ExecContext(ctx, query, upload.BlobHash, upload.UploadedAt, upload.Size, upload.DurationMs)
+	}
+
+	return err
+}
+
+// GetByBlobHash retrieves an upload record by blob hash
+func (r *UploadRepository) GetByBlobHash(ctx context.Context, blobHash string) (*Upload, error) {
+	query := `
+		SELECT blob_hash, uploaded_at, size, duration_ms
+		FROM uploads
+		WHERE blob_hash = ?
+	`
+
+	var upload Upload
+	err := r.conn.QueryRowContext(ctx, query, blobHash).Scan(
+		&upload.BlobHash,
+		&upload.UploadedAt,
+		&upload.Size,
+		&upload.DurationMs,
+	)
+
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	return &upload, nil
+}
+
+// GetRecentUploads retrieves recent uploads ordered by upload time
+func (r *UploadRepository) GetRecentUploads(ctx context.Context, limit int) ([]*Upload, error) {
+	query := `
+		SELECT blob_hash, uploaded_at, size, duration_ms
+		FROM uploads
+		ORDER BY uploaded_at DESC
+		LIMIT ?
+	`
+
+	rows, err := r.conn.QueryContext(ctx, query, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer func() {
+		if err := rows.Close(); err != nil {
+			log.Error("failed to close rows", "error", err)
+		}
+	}()
+
+	var uploads []*Upload
+	for rows.Next() {
+		var upload Upload
+		if err := rows.Scan(&upload.BlobHash, &upload.UploadedAt, &upload.Size, &upload.DurationMs); err != nil {
+			return nil, err
+		}
+		uploads = append(uploads, &upload)
+	}
+
+	return uploads, rows.Err()
+}
+
+// GetUploadStats returns aggregate statistics for uploads
+func (r *UploadRepository) GetUploadStats(ctx context.Context, since time.Time) (*UploadStats, error) {
+	query := `
+		SELECT 
+			COUNT(*) as count,
+			COALESCE(SUM(size), 0) as total_size,
+			COALESCE(AVG(duration_ms), 0) as avg_duration_ms,
+			COALESCE(MIN(duration_ms), 0) as min_duration_ms,
+			COALESCE(MAX(duration_ms), 0) as max_duration_ms
+		FROM uploads
+		WHERE uploaded_at >= ?
+	`
+
+	var stats UploadStats
+	err := r.conn.QueryRowContext(ctx, query, since).Scan(
+		&stats.Count,
+		&stats.TotalSize,
+		&stats.AvgDurationMs,
+		&stats.MinDurationMs,
+		&stats.MaxDurationMs,
+	)
+
+	return &stats, err
+}
+
+// UploadStats contains aggregate upload statistics
+type UploadStats struct {
+	Count         int64
+	TotalSize     int64
+	AvgDurationMs float64
+	MinDurationMs int64
+	MaxDurationMs int64
+}