feat(restore): add weighted progress, pre-extraction disk check, parallel-dbs flag

Three high-value improvements for cluster restore:

1. Weighted progress by database size
   - Progress now shows percentage by data volume, not just count
   - Phase 3/3: Databases (2/7) - 45.2% by size
   - Gives more accurate ETA for clusters with varied DB sizes

2. Pre-extraction disk space check
   - Checks workdir has 3x archive size before extraction
   - Prevents partial extraction failures when disk fills mid-way
   - Clear error message with required vs available GB

3. --parallel-dbs flag for concurrent restores
   - dbbackup restore cluster archive.tar.gz --parallel-dbs=4
   - Overrides CLUSTER_PARALLELISM config setting
   - Set to 1 for sequential restore (safest for large objects)

bin/README.md

@@ -4,8 +4,8 @@ This directory contains pre-compiled binaries for the DB Backup Tool across mult
 
 ## Build Information
 - **Version**: 3.42.50
-- **Build Time**: 2026-01-16_14:53:54_UTC
+- **Build Time**: 2026-01-16_15:09:21_UTC
-- **Git Commit**: 5728b46
+- **Git Commit**: dd7c4da
 
 ## Recent Updates (v1.1.0)
 - ✅ Fixed TUI progress display with line-by-line output

cmd/restore.go

@@ -28,6 +28,7 @@ var (
 	restoreClean        bool
 	restoreCreate       bool
 	restoreJobs         int
+	restoreParallelDBs  int // Number of parallel database restores
 	restoreTarget       string
 	restoreVerbose      bool
 	restoreNoProgress   bool
@@ -289,6 +290,7 @@ func init() {
 	restoreClusterCmd.Flags().BoolVar(&restoreForce, "force", false, "Skip safety checks and confirmations")
 	restoreClusterCmd.Flags().BoolVar(&restoreCleanCluster, "clean-cluster", false, "Drop all existing user databases before restore (disaster recovery)")
 	restoreClusterCmd.Flags().IntVar(&restoreJobs, "jobs", 0, "Number of parallel decompression jobs (0 = auto)")
+	restoreClusterCmd.Flags().IntVar(&restoreParallelDBs, "parallel-dbs", 0, "Number of databases to restore in parallel (0 = use config default, 1 = sequential)")
 	restoreClusterCmd.Flags().StringVar(&restoreWorkdir, "workdir", "", "Working directory for extraction (use when system disk is small, e.g. /mnt/storage/restore_tmp)")
 	restoreClusterCmd.Flags().BoolVar(&restoreVerbose, "verbose", false, "Show detailed restore progress")
 	restoreClusterCmd.Flags().BoolVar(&restoreNoProgress, "no-progress", false, "Disable progress indicators")
@@ -783,6 +785,12 @@ func runRestoreCluster(cmd *cobra.Command, args []string) error {
 		}
 	}
 
+	// Override cluster parallelism if --parallel-dbs is specified
+	if restoreParallelDBs > 0 {
+		cfg.ClusterParallelism = restoreParallelDBs
+		log.Info("Using custom parallelism for database restores", "parallel_dbs", restoreParallelDBs)
+	}
+
 	// Create restore engine
 	engine := restore.New(cfg, log, db)
 

internal/restore/engine.go

@@ -38,6 +38,10 @@ type DatabaseProgressCallback func(done, total int, dbName string)
 // Parameters: done count, total count, database name, elapsed time for current restore phase, avg duration per DB
 type DatabaseProgressWithTimingCallback func(done, total int, dbName string, phaseElapsed, avgPerDB time.Duration)
 
+// DatabaseProgressByBytesCallback is called with progress weighted by database sizes (bytes)
+// Parameters: bytes completed, total bytes, current database name, databases done count, total database count
+type DatabaseProgressByBytesCallback func(bytesDone, bytesTotal int64, dbName string, dbDone, dbTotal int)
+
 // Engine handles database restore operations
 type Engine struct {
 	cfg              *config.Config
@@ -52,6 +56,7 @@ type Engine struct {
 	progressCallback          ProgressCallback
 	dbProgressCallback        DatabaseProgressCallback
 	dbProgressTimingCallback  DatabaseProgressWithTimingCallback
+	dbProgressByBytesCallback DatabaseProgressByBytesCallback
 }
 
 // New creates a new restore engine
@@ -122,6 +127,11 @@ func (e *Engine) SetDatabaseProgressWithTimingCallback(cb DatabaseProgressWithTi
 	e.dbProgressTimingCallback = cb
 }
 
+// SetDatabaseProgressByBytesCallback sets a callback for progress weighted by database sizes
+func (e *Engine) SetDatabaseProgressByBytesCallback(cb DatabaseProgressByBytesCallback) {
+	e.dbProgressByBytesCallback = cb
+}
+
 // reportProgress safely calls the progress callback if set
 func (e *Engine) reportProgress(current, total int64, description string) {
 	if e.progressCallback != nil {
@@ -143,6 +153,13 @@ func (e *Engine) reportDatabaseProgressWithTiming(done, total int, dbName string
 	}
 }
 
+// reportDatabaseProgressByBytes safely calls the bytes-weighted callback if set
+func (e *Engine) reportDatabaseProgressByBytes(bytesDone, bytesTotal int64, dbName string, dbDone, dbTotal int) {
+	if e.dbProgressByBytesCallback != nil {
+		e.dbProgressByBytesCallback(bytesDone, bytesTotal, dbName, dbDone, dbTotal)
+	}
+}
+
 // loggerAdapter adapts our logger to the progress.Logger interface
 type loggerAdapter struct {
 	logger logger.Logger
@@ -861,6 +878,25 @@ func (e *Engine) RestoreCluster(ctx context.Context, archivePath string) error {
 	// Create temporary extraction directory in configured WorkDir
 	workDir := e.cfg.GetEffectiveWorkDir()
 	tempDir := filepath.Join(workDir, fmt.Sprintf(".restore_%d", time.Now().Unix()))
+
+	// Check disk space for extraction (need ~3x archive size: compressed + extracted + working space)
+	if archiveInfo != nil {
+		requiredBytes := uint64(archiveInfo.Size()) * 3
+		extractionCheck := checks.CheckDiskSpace(workDir)
+		if extractionCheck.AvailableBytes < requiredBytes {
+			operation.Fail("Insufficient disk space for extraction")
+			return fmt.Errorf("insufficient disk space for extraction in %s: need %.1f GB, have %.1f GB (archive size: %.1f GB × 3)",
+				workDir,
+				float64(requiredBytes)/(1024*1024*1024),
+				float64(extractionCheck.AvailableBytes)/(1024*1024*1024),
+				float64(archiveInfo.Size())/(1024*1024*1024))
+		}
+		e.log.Info("Disk space check for extraction passed",
+			"workdir", workDir,
+			"required_gb", float64(requiredBytes)/(1024*1024*1024),
+			"available_gb", float64(extractionCheck.AvailableBytes)/(1024*1024*1024))
+	}
+
 	if err := os.MkdirAll(tempDir, 0755); err != nil {
 		operation.Fail("Failed to create temporary directory")
 		return fmt.Errorf("failed to create temp directory in %s: %w", workDir, err)
@@ -1024,12 +1060,27 @@ func (e *Engine) RestoreCluster(ctx context.Context, archivePath string) error {
 	var restoreErrorsMu sync.Mutex
 	totalDBs := 0
 
-	// Count total databases
+	// Count total databases and calculate total bytes for weighted progress
+	var totalBytes int64
+	dbSizes := make(map[string]int64) // Map database name to dump file size
 	for _, entry := range entries {
 		if !entry.IsDir() {
 			totalDBs++
+			dumpFile := filepath.Join(dumpsDir, entry.Name())
+			if info, err := os.Stat(dumpFile); err == nil {
+				dbName := entry.Name()
+				dbName = strings.TrimSuffix(dbName, ".dump")
+				dbName = strings.TrimSuffix(dbName, ".sql.gz")
+				dbSizes[dbName] = info.Size()
+				totalBytes += info.Size()
 			}
 		}
+	}
+	e.log.Info("Calculated total restore size", "databases", totalDBs, "total_bytes", totalBytes)
+
+	// Track bytes completed for weighted progress
+	var bytesCompleted int64
+	var bytesCompletedMu sync.Mutex
 
 	// Create ETA estimator for database restores
 	estimator := progress.NewETAEstimator("Restoring cluster", totalDBs)
@@ -1202,6 +1253,17 @@ func (e *Engine) RestoreCluster(ctx context.Context, archivePath string) error {
 			completedDBTimes = append(completedDBTimes, dbRestoreDuration)
 			completedDBTimesMu.Unlock()
 
+			// Update bytes completed for weighted progress
+			dbSize := dbSizes[dbName]
+			bytesCompletedMu.Lock()
+			bytesCompleted += dbSize
+			currentBytesCompleted := bytesCompleted
+			currentSuccessCount := int(atomic.LoadInt32(&successCount)) + 1 // +1 because we're about to increment
+			bytesCompletedMu.Unlock()
+
+			// Report weighted progress (bytes-based)
+			e.reportDatabaseProgressByBytes(currentBytesCompleted, totalBytes, dbName, currentSuccessCount, totalDBs)
+
 			atomic.AddInt32(&successCount, 1)
 
 			// Small delay to ensure PostgreSQL fully closes connections before next restore

internal/tui/restore_exec.go

@@ -159,6 +159,10 @@ type sharedProgressState struct {
 	overallPhase   int
 	extractionDone bool
 
+	// Weighted progress by database sizes (bytes)
+	dbBytesTotal int64 // Total bytes across all databases
+	dbBytesDone  int64 // Bytes completed (sum of finished DB sizes)
+
 	// Rolling window for speed calculation
 	speedSamples []restoreSpeedSample
 }
@@ -186,12 +190,12 @@ func clearCurrentRestoreProgress() {
 	currentRestoreProgressState = nil
 }
 
-func getCurrentRestoreProgress() (bytesTotal, bytesDone int64, description string, hasUpdate bool, dbTotal, dbDone int, speed float64, dbPhaseElapsed, dbAvgPerDB time.Duration, currentDB string, overallPhase int, extractionDone bool) {
+func getCurrentRestoreProgress() (bytesTotal, bytesDone int64, description string, hasUpdate bool, dbTotal, dbDone int, speed float64, dbPhaseElapsed, dbAvgPerDB time.Duration, currentDB string, overallPhase int, extractionDone bool, dbBytesTotal, dbBytesDone int64) {
 	currentRestoreProgressMu.Lock()
 	defer currentRestoreProgressMu.Unlock()
 
 	if currentRestoreProgressState == nil {
-		return 0, 0, "", false, 0, 0, 0, 0, 0, "", 0, false
+		return 0, 0, "", false, 0, 0, 0, 0, 0, "", 0, false, 0, 0
 	}
 
 	currentRestoreProgressState.mu.Lock()
@@ -205,7 +209,8 @@ func getCurrentRestoreProgress() (bytesTotal, bytesDone int64, description strin
 		currentRestoreProgressState.dbTotal, currentRestoreProgressState.dbDone, speed,
 		currentRestoreProgressState.dbPhaseElapsed, currentRestoreProgressState.dbAvgPerDB,
 		currentRestoreProgressState.currentDB, currentRestoreProgressState.overallPhase,
-		currentRestoreProgressState.extractionDone
+		currentRestoreProgressState.extractionDone,
+		currentRestoreProgressState.dbBytesTotal, currentRestoreProgressState.dbBytesDone
 }
 
 // calculateRollingSpeed calculates speed from recent samples (last 5 seconds)
@@ -359,6 +364,20 @@ func executeRestoreWithTUIProgress(parentCtx context.Context, cfg *config.Config
 			progressState.bytesDone = 0
 		})
 
+		// Set up weighted (bytes-based) progress callback for accurate cluster restore progress
+		engine.SetDatabaseProgressByBytesCallback(func(bytesDone, bytesTotal int64, dbName string, dbDone, dbTotal int) {
+			progressState.mu.Lock()
+			defer progressState.mu.Unlock()
+			progressState.dbBytesDone = bytesDone
+			progressState.dbBytesTotal = bytesTotal
+			progressState.dbDone = dbDone
+			progressState.dbTotal = dbTotal
+			progressState.currentDB = dbName
+			progressState.overallPhase = 3
+			progressState.extractionDone = true
+			progressState.hasUpdate = true
+		})
+
 		// Store progress state in a package-level variable for the ticker to access
 		// This is a workaround because tea messages can't be sent from callbacks
 		setCurrentRestoreProgress(progressState)
@@ -412,7 +431,7 @@ func (m RestoreExecutionModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			m.elapsed = time.Since(m.startTime)
 
 			// Poll shared progress state for real-time updates
-			bytesTotal, bytesDone, description, hasUpdate, dbTotal, dbDone, speed, dbPhaseElapsed, dbAvgPerDB, currentDB, overallPhase, extractionDone := getCurrentRestoreProgress()
+			bytesTotal, bytesDone, description, hasUpdate, dbTotal, dbDone, speed, dbPhaseElapsed, dbAvgPerDB, currentDB, overallPhase, extractionDone, dbBytesTotal, dbBytesDone := getCurrentRestoreProgress()
 			if hasUpdate && bytesTotal > 0 && !extractionDone {
 				// Phase 1: Extraction
 				m.bytesTotal = bytesTotal
@@ -443,8 +462,16 @@ func (m RestoreExecutionModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				} else {
 					m.status = "Finalizing..."
 				}
+
+				// Use weighted progress by bytes if available, otherwise use count
+				if dbBytesTotal > 0 {
+					weightedPercent := int((dbBytesDone * 100) / dbBytesTotal)
+					m.phase = fmt.Sprintf("Phase 3/3: Databases (%d/%d) - %.1f%% by size", dbDone, dbTotal, float64(dbBytesDone*100)/float64(dbBytesTotal))
+					m.progress = weightedPercent
+				} else {
 					m.phase = fmt.Sprintf("Phase 3/3: Databases (%d/%d)", dbDone, dbTotal)
 					m.progress = int((dbDone * 100) / dbTotal)
+				}
 			} else if hasUpdate && extractionDone && dbTotal == 0 {
 				// Phase 2: Globals restore (brief phase between extraction and databases)
 				m.overallPhase = 2