feat: add user registration web form at /register

- internal/core/sync/: Service, Client, Blob packages

- RecordOp creates sync_ops entries for all mutations

- Client for push/pull/blob HTTP to server

- Blob SHA-256 hashing and local storage

- Wired into app.go alongside activity recording

- Device ID from config or fallback

.gitignore

@@ -24,6 +24,7 @@ frontend/node_modules/
 frontend/bindings/
 /verstak-gui
 /verstak-cli
+/verstak-server
 
 # Vault data
 .verstak/

cmd/verstak-gui/app.go

@@ -14,12 +14,14 @@ import (
 
 	"verstak/internal/core/actions"
 	"verstak/internal/core/activity"
+	"verstak/internal/core/config"
 	"verstak/internal/core/files"
 	"verstak/internal/core/notes"
 	"verstak/internal/core/nodes"
 	"verstak/internal/core/plugins"
 	"verstak/internal/core/search"
 	"verstak/internal/core/storage"
+	syncsvc "verstak/internal/core/sync"
 	"verstak/internal/core/worklog"
 )
 
@@ -37,6 +39,7 @@ type App struct {
 	worklog *worklog.Service
 	search  *search.Service
 	plugins *plugins.Manager
+	sync    *syncsvc.Service
 	vault   string
 }
 
@@ -386,6 +389,7 @@ func (a *App) CreateNode(parentID, nodeType, title, section string) (*NodeDTO, e
 		return nil, err
 	}
 	_ = a.activity.Record(n.ID, activity.TargetNode, n.ID, "", activity.TypeNodeCreated, title, "")
+	_ = a.sync.RecordOp(syncsvc.EntityNode, n.ID, syncsvc.OpCreate, map[string]string{"title": title})
 	dto := toNodeDTO(n)
 	return &dto, nil
 }
@@ -480,6 +484,7 @@ func (a *App) CreateNote(parentID, title string) (*NodeDTO, error) {
 		return nil, err
 	}
 	_ = a.activity.Record(parentID, activity.TargetNote, node.ID, "", activity.TypeNoteCreated, title, "")
+	_ = a.sync.RecordOp(syncsvc.EntityNote, node.ID, syncsvc.OpCreate, map[string]string{"title": title})
 	dto := toNodeDTO(node)
 	return &dto, nil
 }
@@ -501,6 +506,7 @@ func (a *App) SaveNote(noteID, content string) error {
 			pid = *n.ParentID
 		}
 		_ = a.activity.Record(pid, activity.TargetNote, noteID, "", activity.TypeNoteUpdated, n.Title, "")
+		_ = a.sync.RecordOp(syncsvc.EntityNote, noteID, syncsvc.OpUpdate, map[string]string{"title": n.Title})
 	}
 	return nil
 }
@@ -573,6 +579,7 @@ func (a *App) AddPathCopy(nodeID, sourcePath string) ([]NodeDTO, error) {
 	}
 	for _, n := range nodes {
 		_ = a.activity.Record(nodeID, activity.TargetFile, n.ID, "", activity.TypeFileAdded, n.Title, `{"source":"`+sourcePath+`"}`)
+		_ = a.sync.RecordOp(syncsvc.EntityFile, n.ID, syncsvc.OpCreate, map[string]string{"title": n.Title})
 	}
 	return toNodeDTOs(nodes), nil
 }
@@ -584,6 +591,7 @@ func (a *App) AddPathLink(nodeID, sourcePath string) ([]NodeDTO, error) {
 	}
 	for _, n := range nodes {
 		_ = a.activity.Record(nodeID, activity.TargetFile, n.ID, "", activity.TypeFileAdded, n.Title, `{"source":"`+sourcePath+`"}`)
+		_ = a.sync.RecordOp(syncsvc.EntityFile, n.ID, syncsvc.OpCreate, map[string]string{"title": n.Title})
 	}
 	return toNodeDTOs(nodes), nil
 }
@@ -602,6 +610,11 @@ func (a *App) DeleteFileOrFolder(nodeID string) error {
 			targetType = activity.TargetFolder
 		}
 		_ = a.activity.Record(pid, targetType, nodeID, "", evType, n.Title, "")
+		syncEntity := syncsvc.EntityFile
+		if n.Type == nodes.TypeFolder {
+			syncEntity = syncsvc.EntityFolder
+		}
+		_ = a.sync.RecordOp(syncEntity, nodeID, syncsvc.OpDelete, nil)
 	}
 	return a.files.DeleteNodeAndChildren(nodeID)
 }
@@ -612,6 +625,7 @@ func (a *App) CreateEmptyFile(parentID, filename string) (*NodeDTO, error) {
 		return nil, err
 	}
 	_ = a.activity.Record(parentID, activity.TargetFile, node.ID, "", activity.TypeFileAdded, filename, "")
+	_ = a.sync.RecordOp(syncsvc.EntityFile, node.ID, syncsvc.OpCreate, map[string]string{"title": filename})
 	dto := toNodeDTO(node)
 	return &dto, nil
 }
@@ -628,6 +642,7 @@ func (a *App) DuplicateNode(nodeID string) (*NodeDTO, error) {
 		pid = *n.ParentID
 	}
 	_ = a.activity.Record(pid, activity.TargetFile, node.ID, "", activity.TypeFileCopied, node.Title, "")
+	_ = a.sync.RecordOp(syncsvc.EntityFile, node.ID, syncsvc.OpCreate, map[string]string{"title": node.Title})
 	dto := toNodeDTO(node)
 	return &dto, nil
 }
@@ -652,6 +667,11 @@ func (a *App) RenameNode(nodeID, newTitle string) error {
 		targetType = activity.TargetFolder
 	}
 	_ = a.activity.Record(pid, targetType, nodeID, "", evType, newTitle, `{"from":"`+oldTitle+`","to":"`+newTitle+`"}`)
+	syncEntity := syncsvc.EntityFile
+	if n.Type == nodes.TypeFolder {
+		syncEntity = syncsvc.EntityFolder
+	}
+	_ = a.sync.RecordOp(syncEntity, nodeID, syncsvc.OpUpdate, map[string]string{"title": newTitle})
 	return nil
 }
 
@@ -687,6 +707,7 @@ func (a *App) MoveNode(nodeID, newParentID string) error {
 		pid = *node.ParentID
 	}
 	_ = a.activity.Record(pid, activity.TargetFile, nodeID, "", activity.TypeFileMoved, node.Title, `{"to":"`+newParentID+`"}`)
+	_ = a.sync.RecordOp(syncsvc.EntityFile, nodeID, syncsvc.OpMove, map[string]string{"title": node.Title})
 	return nil
 }
 
@@ -725,6 +746,7 @@ func (a *App) CreateAction(nodeID, kind, title, data string) (*ActionDTO, error)
 	if err != nil {
 		return nil, err
 	}
+	_ = a.sync.RecordOp(syncsvc.EntityAction, rec.ID, syncsvc.OpCreate, map[string]string{"title": rec.Title, "kind": rec.Kind})
 	return &ActionDTO{
 		ID:     rec.ID,
 		NodeID: rec.NodeID,
@@ -735,6 +757,7 @@ func (a *App) CreateAction(nodeID, kind, title, data string) (*ActionDTO, error)
 }
 
 func (a *App) DeleteAction(id string) error {
+	_ = a.sync.RecordOp(syncsvc.EntityAction, id, syncsvc.OpDelete, nil)
 	return a.actions.Delete(id)
 }
 
@@ -774,6 +797,7 @@ func (a *App) CreateWorklog(nodeID, summary string, minutes int) (*WorklogDTO, e
 	if err != nil {
 		return nil, err
 	}
+	_ = a.sync.RecordOp(syncsvc.EntityWorklog, entry.ID, syncsvc.OpCreate, map[string]string{"summary": summary})
 	mins := 0
 	if entry.Minutes != nil {
 		mins = *entry.Minutes
@@ -812,6 +836,122 @@ func (a *App) Search(query string) ([]SearchResultDTO, error) {
 	return out, nil
 }
 
+// ============================================================
+// Sync
+// ============================================================
+
+type SyncStatusDTO struct {
+	Configured   bool   `json:"configured"`
+	ServerURL    string `json:"serverUrl"`
+	DeviceID     string `json:"deviceId"`
+	UnpushedOps  int    `json:"unpushedOps"`
+	LastSyncAt   string `json:"lastSyncAt"`
+	SyncInterval int    `json:"syncInterval"`
+}
+
+func (a *App) SyncStatus() (*SyncStatusDTO, error) {
+	serverURL, apiKey, _, lastSyncAt, err := a.sync.GetState()
+	if err != nil {
+		return &SyncStatusDTO{}, nil
+	}
+	unpushed, _ := a.sync.GetUnpushedOps()
+	cfg, _ := config.Load(a.vault)
+	dto := &SyncStatusDTO{
+		Configured:  serverURL != "" && apiKey != "",
+		ServerURL:   serverURL,
+		UnpushedOps: len(unpushed),
+		LastSyncAt:  lastSyncAt,
+	}
+	if cfg != nil {
+		dto.DeviceID = cfg.Sync.DeviceID
+		dto.SyncInterval = cfg.Sync.SyncInterval
+	}
+	return dto, nil
+}
+
+func (a *App) SyncConfigure(serverURL, username, password string) error {
+	// Register device on server with user credentials.
+	hostname, _ := os.Hostname()
+	if hostname == "" {
+		hostname = "unknown"
+	}
+	client := syncsvc.NewClient(serverURL, "", "", a.vault)
+	deviceID, apiKey, err := client.RegisterDeviceWithAuth(hostname, username, password)
+	if err != nil {
+		return fmt.Errorf("register: %w", err)
+	}
+
+	if err := a.sync.SetState(serverURL, apiKey); err != nil {
+		return err
+	}
+	// Persist to vault config.
+	cfg, err := config.Load(a.vault)
+	if err != nil {
+		return err
+	}
+	cfg.Sync.ServerURL = serverURL
+	cfg.Sync.APIKey = apiKey
+	cfg.Sync.DeviceID = deviceID
+	return config.Save(a.vault, cfg)
+}
+
+func (a *App) SyncTestConnection(serverURL, username, password string) error {
+	client := syncsvc.NewClient(serverURL, "", "", a.vault)
+	_, _, err := client.RegisterDeviceWithAuth("test-connection", username, password)
+	return err
+}
+
+func (a *App) SyncSetInterval(minutes int) error {
+	cfg, err := config.Load(a.vault)
+	if err != nil {
+		return err
+	}
+	cfg.Sync.SyncInterval = minutes
+	return config.Save(a.vault, cfg)
+}
+
+func (a *App) SyncNow() (map[string]interface{}, error) {
+	serverURL, apiKey, lastRev, _, err := a.sync.GetState()
+	if err != nil || serverURL == "" || apiKey == "" {
+		return nil, fmt.Errorf("sync not configured")
+	}
+
+	deviceID := ""
+	if cfg, err := config.Load(a.vault); err == nil {
+		deviceID = cfg.Sync.DeviceID
+	}
+
+	client := syncsvc.NewClient(serverURL, apiKey, deviceID, a.vault)
+
+	// Push unpushed ops.
+	unpushed, err := a.sync.GetUnpushedOps()
+	if err != nil {
+		return nil, fmt.Errorf("get ops: %w", err)
+	}
+	pushResult := &syncsvc.PushResponse{}
+	if len(unpushed) > 0 {
+		pushResult, err = client.Push(unpushed)
+		if err != nil {
+			return nil, fmt.Errorf("push: %w", err)
+		}
+		if err := a.sync.MarkPushed(pushResult.Accepted); err != nil {
+			return nil, fmt.Errorf("mark pushed: %w", err)
+		}
+	}
+
+	// Pull remote ops.
+	pullResult, err := client.Pull(lastRev)
+	if err != nil {
+		return nil, fmt.Errorf("pull: %w", err)
+	}
+
+	return map[string]interface{}{
+		"pushed":         len(pushResult.Accepted),
+		"pulled":         len(pullResult.Ops),
+		"serverRevision": pullResult.ServerRevision,
+	}, nil
+}
+
 // ============================================================
 // File Dialogs (Wails v2 Runtime)
 // ============================================================

cmd/verstak-gui/main.go

@@ -8,12 +8,14 @@ import (
 
 	"verstak/internal/core/actions"
 	"verstak/internal/core/activity"
+	"verstak/internal/core/config"
 	"verstak/internal/core/files"
 	"verstak/internal/core/notes"
 	"verstak/internal/core/nodes"
 	"verstak/internal/core/plugins"
 	"verstak/internal/core/search"
 	"verstak/internal/core/storage"
+	syncsvc "verstak/internal/core/sync"
 	"verstak/internal/core/worklog"
 
 	"github.com/wailsapp/wails/v2"
@@ -53,6 +55,16 @@ func main() {
 	pm := plugins.NewManager(abs)
 	pm.Discover()
 
+	// Sync service — use configured device ID or vault ID as fallback.
+	deviceID := ""
+	if cfg, err := config.Load(abs); err == nil {
+		deviceID = cfg.Sync.DeviceID
+	}
+	if deviceID == "" {
+		deviceID = "gui-" + abs[:8]
+	}
+	syncSvc := syncsvc.NewService(db, deviceID)
+
 	app := &App{
 		db:       db,
 		nodes:    nodeRepo,
@@ -63,6 +75,7 @@ func main() {
 		worklog:  worklogSvc,
 		search:   searchSvc,
 		plugins:  pm,
+		sync:     syncSvc,
 		vault:    abs,
 	}
 

cmd/verstak-server/install.sh

@@ -0,0 +1,110 @@
+#!/bin/sh
+#
+# install.sh — установка Verstak Sync Server
+#
+# Использование:
+#   sudo ./install.sh --port 47732 --user verstak --admin-user admin --admin-pass secret
+#
+# Флаги:
+#   --port         Порт сервера (по умолчанию: 47732)
+#   --user         Системный пользователь (по умолчанию: verstak)
+#   --admin-user   Логин администратора (обязательный)
+#   --admin-pass   Пароль администратора (обязательный)
+#   --bin          Путь к бинарнику (по умолчанию: ./verstak-server)
+#
+
+set -e
+
+# Defaults
+PORT="${VERSTAK_PORT:-47732}"
+USER="verstak"
+ADMIN_USER=""
+ADMIN_PASS=""
+BIN="./verstak-server"
+
+# Parse flags
+while [ $# -gt 0 ]; do
+    case "$1" in
+        --port) PORT="$2"; shift 2 ;;
+        --user) USER="$2"; shift 2 ;;
+        --admin-user) ADMIN_USER="$2"; shift 2 ;;
+        --admin-pass) ADMIN_PASS="$2"; shift 2 ;;
+        --bin) BIN="$2"; shift 2 ;;
+        *) echo "Unknown: $1"; exit 1 ;;
+    esac
+done
+
+if [ -z "$ADMIN_USER" ] || [ -z "$ADMIN_PASS" ]; then
+    echo "Usage: $0 --admin-user USER --admin-pass PASS [--port PORT] [--user USER]"
+    exit 1
+fi
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo "This script must be run as root (sudo)."
+    exit 1
+fi
+
+echo "=== Verstak Sync Server Installation ==="
+echo "Port:        $PORT"
+echo "User:        $USER"
+echo "Admin:       $ADMIN_USER"
+echo "Binary:      $BIN"
+echo ""
+
+# 1. Create system user if not exists.
+if ! id -u "$USER" >/dev/null 2>&1; then
+    echo "Creating user: $USER"
+    useradd --system --no-create-home --shell /usr/sbin/nologin "$USER"
+fi
+
+# 2. Install binary.
+if [ ! -f "$BIN" ]; then
+    echo "Binary not found: $BIN. Build it first: go build -o $BIN ./cmd/verstak-server/"
+    exit 1
+fi
+echo "Installing binary to /usr/local/bin/verstak-server"
+cp "$BIN" /usr/local/bin/verstak-server
+chmod 755 /usr/local/bin/verstak-server
+
+# 3. Create data directory.
+echo "Creating /var/lib/verstak-server"
+mkdir -p /var/lib/verstak-server
+chown "$USER:$USER" /var/lib/verstak-server
+chmod 750 /var/lib/verstak-server
+
+# 4. Set up admin user (first run).
+echo "Setting up admin user"
+/usr/local/bin/verstak-server \
+    --port "$PORT" \
+    --data /var/lib/verstak-server \
+    --admin-user "$ADMIN_USER" \
+    --admin-pass "$ADMIN_PASS" &
+SERVER_PID=$!
+sleep 2
+kill "$SERVER_PID" 2>/dev/null || true
+wait "$SERVER_PID" 2>/dev/null || true
+
+# 5. Install systemd unit.
+echo "Installing systemd unit"
+SERVICE_FILE="/etc/systemd/system/verstak-server.service"
+cp "$(dirname "$0")/verstak-server.service" "$SERVICE_FILE"
+chmod 644 "$SERVICE_FILE"
+
+# Set port in environment file.
+mkdir -p /etc/verstak-server
+echo "VERSTAK_PORT=$PORT" > /etc/verstak-server/env
+
+# 6. Enable and start.
+echo "Enabling and starting service"
+systemctl daemon-reload
+systemctl enable verstak-server
+systemctl start verstak-server
+
+echo ""
+echo "=== Installation complete ==="
+echo "Service: verstak-server"
+echo "Port:    $PORT"
+echo "Admin:   http://localhost:$PORT/admin/login"
+echo ""
+echo "Check status: systemctl status verstak-server"
+echo "View logs:    journalctl -u verstak-server -f"

cmd/verstak-server/main.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+)
+
+func main() {
+	port := flag.Int("port", 47732, "HTTP port")
+	dataDir := flag.String("data", "./server-data", "Data directory (db, blobs, config)")
+	adminUser := flag.String("admin-user", "", "Create admin user (first run)")
+	adminPass := flag.String("admin-pass", "", "Admin password (first run)")
+	flag.Parse()
+
+	absData, err := filepath.Abs(*dataDir)
+	if err != nil {
+		log.Fatalf("data dir: %v", err)
+	}
+
+	if err := os.MkdirAll(absData, 0750); err != nil {
+		log.Fatalf("create data dir: %v", err)
+	}
+
+	cfg, err := LoadConfig(absData)
+	if err != nil {
+		log.Fatalf("config: %v", err)
+	}
+
+	// First-run admin setup.
+	if *adminUser != "" && *adminPass != "" {
+		if err := cfg.SetAdmin(*adminUser, *adminPass); err != nil {
+			log.Fatalf("set admin: %v", err)
+		}
+		fmt.Printf("Admin user %q created.\n", *adminUser)
+	}
+
+	// Open server DB.
+	dbPath := filepath.Join(absData, "server.db")
+	srv, err := NewServer(dbPath, absData, cfg)
+	if err != nil {
+		log.Fatalf("server: %v", err)
+	}
+	defer srv.Close()
+
+	addr := fmt.Sprintf(":%d", *port)
+	log.Printf("Verstak Sync Server starting on %s (data: %s)", addr, absData)
+	if err := srv.ListenAndServe(addr); err != nil {
+		log.Fatalf("serve: %v", err)
+	}
+}

cmd/verstak-server/verstak-server.service

@@ -0,0 +1,22 @@
+[Unit]
+Description=Verstak Sync Server
+Documentation=https://github.com/anomalyco/verstak
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/verstak-server --port ${VERSTAK_PORT} --data /var/lib/verstak-server
+Restart=on-failure
+RestartSec=5
+User=verstak
+Group=verstak
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+NoNewPrivileges=true
+ProtectSystem=full
+ProtectHome=true
+PrivateTmp=true
+StateDirectory=verstak-server
+RuntimeDirectory=verstak-server
+
+[Install]
+WantedBy=multi-user.target

cmd/verstak/main.go

@@ -8,9 +8,11 @@ import (
 	"strings"
 
 	"verstak/internal/core/actions"
+	"verstak/internal/core/config"
 	"verstak/internal/core/plugins"
 	"verstak/internal/core/search"
 	"verstak/internal/core/storage"
+	syncsvc "verstak/internal/core/sync"
 	"verstak/internal/core/vault"
 	"verstak/internal/core/worklog"
 )
@@ -38,6 +40,8 @@ func main() {
 		runLog(os.Args[2:])
 	case "index":
 		runIndex(os.Args[2:])
+	case "sync":
+		runSync(os.Args[2:])
 	case "plugin":
 		runPlugin(os.Args[2:])
 	default:
@@ -56,6 +60,7 @@ func usage() {
 	fmt.Println("    node         Manage nodes")
 	fmt.Println("    action       Manage actions")
 	fmt.Println("    --version    Show version")
+	fmt.Println("    sync         Sync with server (push/pull/status)")
 	fmt.Println("    --help       Show this help")
 }
 
@@ -597,6 +602,162 @@ func runIndexRebuild(args []string) {
 	fmt.Printf("indexed %d nodes\n", count)
 }
 
+// --- sync ---
+
+func runSync(args []string) {
+	if len(args) == 0 {
+		fmt.Println("verstak sync — synchronize with server")
+		fmt.Println()
+		fmt.Println("Usage: verstak sync <command> [options]")
+		fmt.Println()
+		fmt.Println("Commands:")
+		fmt.Println("  push       Push local changes to server")
+		fmt.Println("  pull       Pull remote changes from server")
+		fmt.Println("  status     Show sync status")
+		os.Exit(0)
+	}
+	switch args[0] {
+	case "push":
+		runSyncPush(args[1:])
+	case "pull":
+		runSyncPull(args[1:])
+	case "status":
+		runSyncStatus(args[1:])
+	case "--help", "-h":
+		runSync(nil)
+	default:
+		fmt.Fprintf(os.Stderr, "Unknown sync command: %s\n", args[0])
+		os.Exit(1)
+	}
+}
+
+func openSyncDB(args []string) (*storage.DB, string) {
+	vaultPath, _ := stringFlag(args, "--vault")
+	abs, _ := filepath.Abs(vaultPath)
+	dbPath := filepath.Join(abs, ".verstak", "index.db")
+	db, err := storage.Open(dbPath)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Open vault: %v\n", err)
+		os.Exit(1)
+	}
+	return db, abs
+}
+
+func runSyncPush(args []string) {
+	db, abs := openSyncDB(args)
+	defer db.Close()
+
+	cfg, err := config.Load(abs)
+	if err != nil || cfg.Sync.ServerURL == "" || cfg.Sync.APIKey == "" {
+		fmt.Fprintln(os.Stderr, "Sync not configured. Use 'verstak sync configure' or GUI settings.")
+		os.Exit(1)
+	}
+
+	deviceID := cfg.Sync.DeviceID
+	if deviceID == "" {
+		deviceID = "cli-" + abs[:8]
+	}
+
+	syncSvc := syncsvc.NewService(db, deviceID)
+	client := syncsvc.NewClient(cfg.Sync.ServerURL, cfg.Sync.APIKey, deviceID, abs)
+
+	unpushed, err := syncSvc.GetUnpushedOps()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Get ops: %v\n", err)
+		os.Exit(1)
+	}
+
+	if len(unpushed) == 0 {
+		fmt.Println("Nothing to push.")
+		return
+	}
+
+	result, err := client.Push(unpushed)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Push failed: %v\n", err)
+		os.Exit(1)
+	}
+
+	if err := syncSvc.MarkPushed(result.Accepted); err != nil {
+		fmt.Fprintf(os.Stderr, "Mark pushed: %v\n", err)
+		os.Exit(1)
+	}
+
+	fmt.Printf("Pushed %d ops, accepted %d\n", len(unpushed), len(result.Accepted))
+}
+
+func runSyncPull(args []string) {
+	db, abs := openSyncDB(args)
+	defer db.Close()
+
+	cfg, err := config.Load(abs)
+	if err != nil || cfg.Sync.ServerURL == "" || cfg.Sync.APIKey == "" {
+		fmt.Fprintln(os.Stderr, "Sync not configured.")
+		os.Exit(1)
+	}
+
+	deviceID := cfg.Sync.DeviceID
+	if deviceID == "" {
+		deviceID = "cli-" + abs[:8]
+	}
+
+	syncSvc := syncsvc.NewService(db, deviceID)
+	client := syncsvc.NewClient(cfg.Sync.ServerURL, cfg.Sync.APIKey, deviceID, abs)
+
+	_, _, lastRev, _, err := syncSvc.GetState()
+	if err != nil {
+		lastRev = 0
+	}
+
+	result, err := client.Pull(lastRev)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Pull failed: %v\n", err)
+		os.Exit(1)
+	}
+
+	var opIDs []string
+	for _, op := range result.Ops {
+		fmt.Printf("  %s\t%s\t%s\t%s\n", op.OpType, op.EntityType, op.EntityID, op.PayloadJSON)
+		opIDs = append(opIDs, op.OpID)
+	}
+
+	if len(opIDs) > 0 {
+		syncSvc.MarkApplied(opIDs)
+	}
+
+	fmt.Printf("Pulled %d ops (server rev: %d)\n", len(result.Ops), result.ServerRevision)
+}
+
+func runSyncStatus(args []string) {
+	db, abs := openSyncDB(args)
+	defer db.Close()
+
+	cfg, err := config.Load(abs)
+	configured := err == nil && cfg.Sync.ServerURL != "" && cfg.Sync.APIKey != ""
+	serverURL := ""
+	deviceID := ""
+	if cfg != nil {
+		serverURL = cfg.Sync.ServerURL
+		deviceID = cfg.Sync.DeviceID
+	}
+
+	unpushed := 0
+	if configured {
+		if deviceID == "" {
+			deviceID = "cli-" + abs[:8]
+		}
+		syncSvc := syncsvc.NewService(db, deviceID)
+		ops, _ := syncSvc.GetUnpushedOps()
+		unpushed = len(ops)
+	}
+
+	fmt.Println("Sync Status")
+	fmt.Println("  Configured:", configured)
+	fmt.Println("  Server:", serverURL)
+	fmt.Println("  Device:", deviceID)
+	fmt.Println("  Unpushed ops:", unpushed)
+}
+
 // --- plugin ---
 
 func runPlugin(args []string) {

docs/00_README.md

@@ -37,6 +37,7 @@
 7. [[07_AI_Coder_Prompts]] — промпты для ИИ-кодера.
 8. [[08_MVP_Checklist]] — чеклист первого MVP.
 9. [[09_Extensibility]] — архитектура плагинов (Lua + шаблоны дел).
+10. [[10_Sync_Server_Guide]] — установка и настройка сервера синхронизации.
 
 ## Главные принципы
 

docs/10_Sync_Server_Guide.md

@@ -0,0 +1,185 @@
+# Сервер синхронизации Верстак — руководство
+
+## 1. Зачем нужен сервер
+
+Сервер позволяет синхронизировать данные между несколькими устройствами (например, рабочий ПК и ноутбук), а также хранить резервную копию vault'ов.
+
+Он не обязателен — Верстак работает полностью локально и без сервера.
+
+## 2. Установка
+
+### Быстрая установка (systemd)
+
+```bash
+# Сборка бинарника
+go build -o verstak-server ./cmd/verstak-server/
+
+# Установка (от root)
+sudo ./verstak-server/install.sh \
+  --port 47732 \
+  --admin-user admin \
+  --admin-pass 'мой-надёжный-пароль'
+```
+
+Скрипт:
+- создаёт системного пользователя `verstak`;
+- копирует бинарник в `/usr/local/bin/verstak-server`;
+- создаёт `/var/lib/verstak-server` для данных;
+- записывает админа в конфиг;
+- устанавливает systemd-сервис `verstak-server.service`;
+- запускает и включает автозапуск.
+
+### Ручной запуск (для тестирования)
+
+```bash
+# Одной командой
+./verstak-server \
+  --port 47732 \
+  --data ./server-data \
+  --admin-user admin \
+  --admin-pass 'мой-надёжный-пароль'
+```
+
+Флаги:
+| Флаг | По умолчанию | Описание |
+|---|---|---|
+| `--port` | `47732` | Порт сервера |
+| `--data` | `./data` | Директория для данных (SQLite + blobs) |
+| `--admin-user` | — | Имя администратора (создаётся при первом запуске) |
+| `--admin-pass` | — | Пароль администратора |
+
+Если не указать `--admin-user` и `--admin-pass`, сервер запустится, но админ-панель будет недоступна (некому будет логиниться).
+
+## 3. Админ-панель
+
+### Как открыть
+
+Откройте в браузере: `http://<сервер>:47732/admin/login`
+
+Войдите с логином и паролем, указанными при установке.
+
+### Что там есть
+
+- **Дашборд** — статистика: количество устройств, количество операций, список API-ключей.
+- **Управление API-ключами** — просмотр, создание и удаление ключей устройств.
+
+Сессия живёт 24 часа. После перезапуска сервера все сессии сбрасываются (хранятся в памяти).
+
+### Несколько админов
+
+Можно запустить сервер с другими `--admin-user`/`--admin-pass` — добавится второй администратор. Повторный запуск с тем же именем меняет пароль.
+
+## 4. API-ключи (устройства)
+
+### Что такое API-ключ
+
+API-ключ — это токен, который клиент (Верстак на вашем ноутбуке или ПК) использует для доступа к серверу. Без ключа push/pull/blobs не работают.
+
+### Как создать
+
+Через админ-панель:
+1. Зайти в `/admin/dashboard`.
+2. В разделе "API Keys" ввести имя устройства и нажать "Create".
+3. Скопировать сгенерированный ключ.
+
+Через API (требует логин и пароль администратора):
+```bash
+curl -X POST http://localhost:47732/api/v1/device/register \
+  -H "Content-Type: application/json" \
+  -d '{"name":"мой-ноутбук","username":"admin","password":"пароль-админа"}'
+```
+Ответ: `{"device_id":"...","api_key":"..."}`
+
+**Важно:** не выставляйте сервер в интернет без HTTPS (через reverse proxy). До создания полноценной системы пользователей регистрация устройств требует учётных данных администратора.
+
+### Как использовать
+
+Ключ передаётся в заголовке `Authorization: Bearer <ключ>`:
+```bash
+curl -X POST http://localhost:47732/api/v1/sync/push \
+  -H "Authorization: Bearer b10c5d8e3f2a..." \
+  -H "Content-Type: application/json" \
+  -d '{"device_id":"b10c5d8e3f2a","ops":[...]}'
+```
+
+В клиенте Верстак достаточно вбить URL сервера и API-ключ в настройках (GUI Settings или `config.yml`).
+
+### Один ключ на все устройства или отдельный на каждое?
+
+**На каждое устройство — отдельный ключ.** Так вы сможете отозвать доступ конкретному устройству (удалить ключ в админ-панели), не затронув остальные.
+
+Технически один и тот же ключ можно использовать на нескольких устройствах, но:
+- его нельзя будет удалить, не отключив все устройства разом;
+- в логах сервера все операции будут выглядеть как от одного устройства;
+- это не поддерживаемый сценарий.
+
+**Рекомендация:** создавайте отдельный ключ для каждого клиента (ПК, ноутбук, телефон).
+
+## 5. Настройка клиента
+
+### CLI
+```bash
+verstak sync push --vault /путь/к/vault
+verstak sync pull --vault /путь/к/vault
+verstak sync status --vault /путь/к/vault
+```
+
+Перед использованием нужно указать URL сервера и API-ключ в `.verstak/config.yml` внутри vault:
+```yaml
+sync:
+  server_url: http://мой-сервер:47732
+  api_key: мой-ключ
+  device_id: id-устройства   # опционально
+  auto_sync: false
+```
+
+### GUI
+В графическом интерфейсе нажмите на иконку шестерёнки в левом нижнем углу → откроется окно настроек синхронизации. Укажите URL сервера и API-ключ, нажмите "Сохранить". Кнопка "Синхронизировать" запускает push + pull.
+
+## 6. Безопасность
+
+Сервер **не поддерживает HTTPS**. В production используйте reverse proxy (nginx, Caddy) для терминирования TLS.
+
+Что стоит учесть:
+- Регистрация устройств открыта — любой, кто достучался до сервера, может создать ключ.
+- Нет logout'а — сессия живёт 24 часа или до перезапуска сервера.
+- Нет rate limiting'а — возможен перебор пароля.
+- Пароль хранится в bcrypt — база данных не должна быть общедоступной.
+
+Рекомендации для production:
+- Закрыть порт сервера фаерволом (только доверенные IP).
+- Использовать VPN (WireGuard/OpenVPN) для доступа между устройствами.
+- Или поставить nginx/Caddy перед сервером с HTTPS и базовой аутентификацией на `/api/v1/device/register`.
+
+## 7. Полный API
+
+### Открытые endpoint'ы
+
+| Метод | Путь | Описание |
+|---|---|---|
+| GET | `/api/v1/health` | Проверка здоровья сервера |
+
+### Требуют API-ключ (Authorization: Bearer)
+
+| Метод | Путь | Описание |
+|---|---|---|
+| POST | `/api/v1/sync/push` | Отправить операции на сервер |
+| POST | `/api/v1/sync/pull` | Получить операции с сервера |
+| POST | `/api/v1/blobs/` | Загрузить blob (multipart) |
+| GET | `/api/v1/blobs/{sha256}` | Скачать blob |
+
+### Требуют логин+пароль администратора
+
+| Метод | Путь | Описание |
+|---|---|---|
+| POST | `/api/v1/device/register` | Регистрация устройства (body: name + username + password) |
+
+### Требуют сессию админа (cookie)
+
+| Метод | Путь | Описание |
+|---|---|---|
+| GET/POST | `/admin/login` | Страница входа / отправка формы |
+| GET | `/admin/dashboard` | Дашборд |
+| GET | `/admin/api/keys` | Список API-ключей (JSON) |
+| POST | `/admin/api/keys` | Создать ключ |
+| DELETE | `/admin/api/keys/{id}` | Удалить ключ |

frontend/src/App.svelte

@@ -98,6 +98,16 @@
   let renameValue = ''
   let renameError = ''
 
+  // ===== Sync state =====
+  let showSettings = false
+  let syncStatus = null
+  let syncLoading = false
+  let syncServerUrl = ''
+  let syncUsername = ''
+  let syncPassword = ''
+  let syncInterval = 0
+  let syncResult = ''
+
   const tabs = [
     { id: 'overview', label: 'Обзор' },
     { id: 'notes', label: 'Заметки' },
@@ -138,6 +148,7 @@
     window.addEventListener('keydown', handleKeydown)
 
     loading = false
+    loadSyncStatus()
   })
 
   onDestroy(() => {
@@ -882,6 +893,70 @@
       error = String(e)
     }
   }
+
+  // ===== Sync =====
+  async function loadSyncStatus() {
+    try {
+      syncStatus = await wailsCall('SyncStatus')
+    } catch (e) {
+      syncStatus = { configured: false, serverUrl: '', deviceId: '', unpushedOps: 0, lastSyncAt: '', syncInterval: 0 }
+    }
+  }
+
+  function openSettings() {
+    showSettings = true
+    syncServerUrl = syncStatus?.serverUrl || ''
+    syncUsername = ''
+    syncPassword = ''
+    syncInterval = syncStatus?.syncInterval || 0
+    syncResult = ''
+  }
+
+  function closeSettings() {
+    showSettings = false
+    syncResult = ''
+  }
+
+  async function saveSyncConfig() {
+    syncLoading = true
+    syncResult = ''
+    try {
+      await wailsCall('SyncConfigure', syncServerUrl, syncUsername, syncPassword)
+      if (syncInterval > 0) {
+        await wailsCall('SyncSetInterval', syncInterval)
+      }
+      syncResult = 'ok'
+      await loadSyncStatus()
+    } catch (e) {
+      syncResult = 'err: ' + String(e)
+    }
+    syncLoading = false
+  }
+
+  async function testConnection() {
+    syncLoading = true
+    syncResult = ''
+    try {
+      await wailsCall('SyncTestConnection', syncServerUrl, syncUsername, syncPassword)
+      syncResult = 'connection ok'
+    } catch (e) {
+      syncResult = 'connection failed: ' + String(e)
+    }
+    syncLoading = false
+  }
+
+  async function runSyncNow() {
+    syncLoading = true
+    syncResult = ''
+    try {
+      const r = await wailsCall('SyncNow')
+      syncResult = 'pushed ' + r.pushed + ', pulled ' + r.pulled + ' (rev ' + r.serverRevision + ')'
+      await loadSyncStatus()
+    } catch (e) {
+      syncResult = 'err: ' + String(e)
+    }
+    syncLoading = false
+  }
 </script>
 
 <div class="app">
@@ -914,7 +989,14 @@
         </div>
       {/if}
     </nav>
-    <div class="sidebar-footer"><span class="version">{version}</span></div>
+    <div class="sidebar-footer">
+      <button class="sidebar-sync-btn" on:click={openSettings} title="Настройки синхронизации">
+        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="23 4 23 10 17 10"/><polyline points="1 20 1 14 7 14"/><path d="M3.51 9a9 9 0 0 1 14.85-3.36L23 10M1 14l4.64 4.36A9 9 0 0 0 20.49 15"/></svg>
+        <span class="sync-dot" class:active={syncStatus?.configured}></span>
+        <span class="sidebar-sync-label">Синхронизация</span>
+      </button>
+      <span class="version">{version}</span>
+    </div>
   </aside>
 
   <!-- Main -->
@@ -930,6 +1012,16 @@
           <span class="crumb placeholder">Выберите раздел или дело</span>
         {/if}
       </div>
+      <div class="header-right">
+        {#if syncStatus?.configured}
+          <button class="header-sync-btn" on:click={runSyncNow} disabled={syncLoading} title="Синхронизировать">
+            <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="23 4 23 10 17 10"/><polyline points="1 20 1 14 7 14"/><path d="M3.51 9a9 9 0 0 1 14.85-3.36L23 10M1 14l4.64 4.36A9 9 0 0 0 20.49 15"/></svg>
+            {#if syncStatus.unpushedOps > 0}
+              <span class="sync-badge">{syncStatus.unpushedOps}</span>
+            {/if}
+          </button>
+        {/if}
+      </div>
     </header>
 
     {#if error}
@@ -1425,6 +1517,48 @@
         on:cancel={handleCancel}
       />
     {/if}
+
+    {#if showSettings}
+      <div class="modal-overlay" on:click|self={closeSettings}>
+        <div class="modal modal-sync">
+          <h3>Настройки синхронизации</h3>
+          {#if syncStatus}
+            <div class="sync-status">
+              <div class="sync-row"><span class="sync-label">Статус</span><span class="sync-value">{syncStatus.configured ? 'Включена' : 'Отключена'}</span></div>
+              <div class="sync-row"><span class="sync-label">Сервер</span><span class="sync-value mono">{syncStatus.serverUrl || '—'}</span></div>
+              <div class="sync-row"><span class="sync-label">Устройство</span><span class="sync-value mono">{syncStatus.deviceId || '—'}</span></div>
+              <div class="sync-row"><span class="sync-label">Неотправлено</span><span class="sync-value">{syncStatus.unpushedOps}</span></div>
+              <div class="sync-row"><span class="sync-label">Последняя синх.</span><span class="sync-value">{syncStatus.lastSyncAt || '—'}</span></div>
+            </div>
+          {/if}
+          <div class="form-group">
+            <label>URL сервера</label>
+            <input type="text" placeholder="https://example.com:47732" bind:value={syncServerUrl} />
+          </div>
+          <div class="form-group">
+            <label>Логин</label>
+            <input type="text" placeholder="username" bind:value={syncUsername} />
+          </div>
+          <div class="form-group">
+            <label>Пароль</label>
+            <input type="password" placeholder="password" bind:value={syncPassword} />
+          </div>
+          <div class="form-group">
+            <label>Автосинхронизация (мин)</label>
+            <input type="number" placeholder="0 = отключено" bind:value={syncInterval} min="0" />
+          </div>
+          {#if syncResult}
+            <div class="sync-result">{syncResult}</div>
+          {/if}
+          <div class="modal-actions">
+            <button class="btn" on:click={testConnection} disabled={syncLoading || !syncServerUrl}>Проверить</button>
+            <button class="btn btn-primary" on:click={saveSyncConfig} disabled={syncLoading}>Подключиться</button>
+            <button class="btn" on:click={runSyncNow} disabled={syncLoading || !syncStatus?.configured}>Синхронизировать</button>
+            <button class="btn" on:click={closeSettings}>Закрыть</button>
+          </div>
+        </div>
+      </div>
+    {/if}
   </main>
 </div>
 
@@ -1444,12 +1578,18 @@
 .nav-item:hover { background: #222233; }
 .nav-item.selected { background: #2a2a4a; color: #fff; font-weight: 500; }
 .nav-empty { padding: 8px 20px; color: #555; font-size: 12px; }
-.sidebar-footer { padding: 12px 20px; border-top: 1px solid #2a2a3c; flex-shrink: 0; }
+.sidebar-footer { padding: 8px 12px; border-top: 1px solid #2a2a3c; flex-shrink: 0; display: flex; flex-direction: column; gap: 4px; }
-.version { font-size: 11px; color: #555; }
+.version { font-size: 11px; color: #555; text-align: center; }
 
 /* Main */
 .main { flex: 1; display: flex; flex-direction: column; height: 100vh; min-width: 0; overflow: hidden; background: #13131f; }
 .header { padding: 12px 24px; border-bottom: 1px solid #2a2a3c; display: flex; align-items: center; flex-shrink: 0; min-height: 48px; }
+.header-left { display: flex; align-items: center; gap: 8px; flex: 1; }
+.header-right { display: flex; align-items: center; gap: 8px; }
+.header-sync-btn { background: #1a1a28; border: 1px solid #2a2a3c; border-radius: 8px; padding: 6px 12px; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; color: #b0b0c0; font-family: inherit; font-size: 13px; position: relative; }
+.header-sync-btn:hover { background: #222233; color: #e4e4ef; border-color: #6366f1; }
+.header-sync-btn:disabled { opacity: 0.5; cursor: not-allowed; }
+.sync-badge { background: #6366f1; color: #fff; font-size: 10px; border-radius: 50%; width: 16px; height: 16px; display: inline-flex; align-items: center; justify-content: center; position: absolute; top: -6px; right: -6px; }
 .crumb { font-size: 14px; font-weight: 500; }
 .crumb.placeholder { color: #666; }
 .crumb-type { font-size: 11px; color: #555; background: #1e1e2e; padding: 2px 8px; border-radius: 10px; margin-left: 8px; }
@@ -1636,4 +1776,18 @@
 .activity-feed-type { font-size: 11px; color: #666; }
 .activity-feed-target { font-size: 10px; color: #555; background: #1e1e2e; padding: 1px 6px; border-radius: 8px; }
 .activity-feed-time { font-size: 11px; color: #555; }
+
+/* Sync */
+.sidebar-sync-btn { background: #1a1a28; border: 1px solid #2a2a3c; border-radius: 8px; padding: 8px 12px; cursor: pointer; width: 100%; display: flex; align-items: center; gap: 8px; color: #888; font-family: inherit; font-size: 13px; }
+.sidebar-sync-btn:hover { background: #222233; color: #e4e4ef; border-color: #6366f1; }
+.sidebar-sync-label { flex: 1; text-align: left; }
+.sync-dot { width: 8px; height: 8px; border-radius: 50%; background: #4a4a4a; flex-shrink: 0; }
+.sync-dot.active { background: #4ade80; box-shadow: 0 0 6px rgba(74,222,128,0.5); }
+.modal-sync { width: 460px; }
+.sync-status { background: #13131f; border-radius: 8px; padding: 12px; margin-bottom: 16px; }
+.sync-row { display: flex; justify-content: space-between; padding: 4px 0; font-size: 13px; }
+.sync-label { color: #666; }
+.sync-value { color: #e4e4ef; }
+.sync-value.mono { font-family: 'SF Mono', 'Fira Code', monospace; font-size: 12px; }
+.sync-result { font-size: 12px; color: #6366f1; padding: 4px 0; }
 </style>

internal/core/config/config.go

@@ -27,6 +27,7 @@ type SyncConfig struct {
 	APIKey      string `yaml:"api_key"`
 	DeviceID    string `yaml:"device_id"`
 	AutoSync    bool   `yaml:"auto_sync"`
+	SyncInterval int   `yaml:"sync_interval"`
 }
 
 type BrowserConfig struct {

internal/core/storage/migrations_010.sql.go

@@ -0,0 +1,29 @@
+package storage
+
+// migration010 — sync_ops table for recording operations to push to sync server.
+const migration010 = `
+CREATE TABLE IF NOT EXISTS sync_ops (
+    id TEXT PRIMARY KEY,
+    op_id TEXT NOT NULL UNIQUE,
+    device_id TEXT NOT NULL,
+    entity_type TEXT NOT NULL,
+    entity_id TEXT NOT NULL,
+    op_type TEXT NOT NULL,
+    payload_json TEXT NOT NULL DEFAULT '{}',
+    created_at TEXT NOT NULL,
+    pushed_at TEXT,
+    applied_at TEXT
+);
+
+CREATE INDEX IF NOT EXISTS idx_sync_ops_pushed ON sync_ops(pushed_at);
+CREATE INDEX IF NOT EXISTS idx_sync_ops_entity ON sync_ops(entity_type, entity_id);
+
+CREATE TABLE IF NOT EXISTS sync_state (
+    device_id TEXT PRIMARY KEY,
+    server_url TEXT NOT NULL DEFAULT '',
+    api_key TEXT NOT NULL DEFAULT '',
+    last_push_rev INTEGER NOT NULL DEFAULT 0,
+    last_pull_rev INTEGER NOT NULL DEFAULT 0,
+    last_sync_at TEXT
+);
+`

internal/core/storage/storage.go

@@ -66,6 +66,7 @@ var migrationFiles = map[int]string{
 	// 7: migration007 (FTS5) — created lazily by search.Rebuild()
 	8: migration008,
 	9: migration009,
+	10: migration010,
 }
 
 func (db *DB) runInitialSchema() error {

internal/core/sync/blob.go

@@ -0,0 +1,80 @@
+package sync
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+)
+
+// BlobDir returns the path to .verstak/blobs/ inside the vault.
+func BlobDir(vaultRoot string) string {
+	return filepath.Join(vaultRoot, ".verstak", "blobs")
+}
+
+// BlobPath returns the on-disk path for a SHA-256 hash.
+func BlobPath(blobsDir, shaHex string) string {
+	return filepath.Join(blobsDir, shaHex[:2], shaHex[2:4], shaHex)
+}
+
+// HashFile computes SHA-256 of a file.
+func HashFile(path string) (string, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+	h := sha256.New()
+	if _, err := io.Copy(h, f); err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(h.Sum(nil)), nil
+}
+
+// HashBytes computes SHA-256 of byte data.
+func HashBytes(data []byte) string {
+	h := sha256.Sum256(data)
+	return hex.EncodeToString(h[:])
+}
+
+// StoreBlob copies a file into the blob store, returns its SHA-256.
+func StoreBlob(blobsDir, srcPath string) (string, error) {
+	shaHex, err := HashFile(srcPath)
+	if err != nil {
+		return "", err
+	}
+	dest := BlobPath(blobsDir, shaHex)
+	if _, err := os.Stat(dest); err == nil {
+		return shaHex, nil // already exists
+	}
+	if err := os.MkdirAll(filepath.Dir(dest), 0750); err != nil {
+		return "", err
+	}
+	src, err := os.Open(srcPath)
+	if err != nil {
+		return "", err
+	}
+	defer src.Close()
+
+	dst, err := os.Create(dest)
+	if err != nil {
+		return "", err
+	}
+	defer dst.Close()
+
+	if _, err := io.Copy(dst, src); err != nil {
+		return "", err
+	}
+	_ = dst.Sync()
+	return shaHex, nil
+}
+
+// ReadBlob reads a blob by SHA-256 hash.
+func ReadBlob(blobsDir, shaHex string) ([]byte, error) {
+	return os.ReadFile(BlobPath(blobsDir, shaHex))
+}
+
+// Ensure the package compiles without unused errors.
+var _ = fmt.Sprintf

internal/core/sync/client.go

@@ -0,0 +1,243 @@
+package sync
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"mime/multipart"
+	"net/http"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+// Client communicates with the Verstak Sync Server.
+type Client struct {
+	ServerURL string
+	APIKey    string
+	DeviceID  string
+	VaultRoot string
+	HTTP      *http.Client
+}
+
+// NewClient creates a sync client.
+func NewClient(serverURL, apiKey, deviceID, vaultRoot string) *Client {
+	return &Client{
+		ServerURL: serverURL,
+		APIKey:    apiKey,
+		DeviceID:  deviceID,
+		VaultRoot: vaultRoot,
+		HTTP: &http.Client{Timeout: 30 * time.Second},
+	}
+}
+
+// RegisterDevice calls POST /api/v1/device/register and returns the API key.
+func (c *Client) RegisterDevice(name string) (apiKey string, err error) {
+	body := map[string]string{"name": name}
+	var resp struct {
+		DeviceID string `json:"device_id"`
+		APIKey   string `json:"api_key"`
+	}
+	if err := c.post("/api/v1/device/register", body, &resp); err != nil {
+		return "", err
+	}
+	return resp.APIKey, nil
+}
+
+// RegisterDeviceWithAuth registers a device with user credentials.
+func (c *Client) RegisterDeviceWithAuth(name, username, password string) (deviceID, apiKey string, err error) {
+	body := map[string]string{"name": name, "username": username, "password": password}
+	var resp struct {
+		DeviceID string `json:"device_id"`
+		APIKey   string `json:"api_key"`
+	}
+	// Temporarily clear API key for this request (server expects login/password, not API key).
+	savedKey := c.APIKey
+	c.APIKey = ""
+	err = c.post("/api/v1/device/register", body, &resp)
+	c.APIKey = savedKey
+	if err != nil {
+		return "", "", err
+	}
+	return resp.DeviceID, resp.APIKey, nil
+}
+
+// Login authenticates with user credentials and returns a session token.
+func (c *Client) Login(username, password string) (token string, err error) {
+	body := map[string]string{"username": username, "password": password}
+	var resp struct {
+		Token string `json:"token"`
+	}
+	savedKey := c.APIKey
+	c.APIKey = ""
+	err = c.post("/api/v1/auth/login", body, &resp)
+	c.APIKey = savedKey
+	if err != nil {
+		return "", err
+	}
+	return resp.Token, nil
+}
+
+// PushRequest is the payload for POST /sync/push.
+type PushRequest struct {
+	DeviceID string     `json:"device_id"`
+	Ops      []PushOp   `json:"ops"`
+}
+
+// PushOp is a single operation in a push request.
+type PushOp struct {
+	OpID        string `json:"op_id"`
+	EntityType  string `json:"entity_type"`
+	EntityID    string `json:"entity_id"`
+	OpType      string `json:"op_type"`
+	PayloadJSON string `json:"payload_json"`
+	CreatedAt   string `json:"created_at"`
+}
+
+// PushResponse is the response from POST /sync/push.
+type PushResponse struct {
+	Accepted []string `json:"accepted"`
+	Count    int      `json:"count"`
+}
+
+// Push sends local operations to the server.
+func (c *Client) Push(ops []Op) (*PushResponse, error) {
+	pushOps := make([]PushOp, len(ops))
+	for i, op := range ops {
+		pushOps[i] = PushOp{
+			OpID:        op.OpID,
+			EntityType:  op.EntityType,
+			EntityID:    op.EntityID,
+			OpType:      op.OpType,
+			PayloadJSON: op.PayloadJSON,
+			CreatedAt:   op.CreatedAt,
+		}
+	}
+	req := PushRequest{DeviceID: c.DeviceID, Ops: pushOps}
+	var resp PushResponse
+	if err := c.post("/api/v1/sync/push", req, &resp); err != nil {
+		return nil, err
+	}
+	return &resp, nil
+}
+
+// PullRequest is the payload for POST /sync/pull.
+type PullRequest struct {
+	SinceRevision int `json:"since_revision"`
+}
+
+// PullResponse is the response from POST /sync/pull.
+type PullResponse struct {
+	ServerRevision int    `json:"server_revision"`
+	Ops            []Op   `json:"ops"`
+}
+
+// Pull fetches remote operations since a given revision.
+func (c *Client) Pull(sinceRevision int) (*PullResponse, error) {
+	req := PullRequest{SinceRevision: sinceRevision}
+	var resp PullResponse
+	if err := c.post("/api/v1/sync/pull", req, &resp); err != nil {
+		return nil, err
+	}
+	return &resp, nil
+}
+
+// UploadBlob uploads a file to the server and returns its SHA-256.
+func (c *Client) UploadBlob(localPath string) (sha256 string, err error) {
+	var b bytes.Buffer
+	w := multipart.NewWriter(&b)
+	fw, err := w.CreateFormFile("file", filepath.Base(localPath))
+	if err != nil {
+		return "", err
+	}
+	f, err := os.Open(localPath)
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+	if _, err := io.Copy(fw, f); err != nil {
+		return "", err
+	}
+	w.Close()
+
+	req, err := http.NewRequest("POST", c.ServerURL+"/api/v1/blobs/", &b)
+	if err != nil {
+		return "", err
+	}
+	req.Header.Set("Content-Type", w.FormDataContentType())
+	req.Header.Set("Authorization", "Bearer "+c.APIKey)
+
+	resp, err := c.HTTP.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	var result struct {
+		SHA256 string `json:"sha256"`
+		Size   int    `json:"size"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return "", err
+	}
+	return result.SHA256, nil
+}
+
+// DownloadBlob downloads a blob by SHA-256 hash.
+func (c *Client) DownloadBlob(sha256, destPath string) error {
+	req, err := http.NewRequest("GET", c.ServerURL+"/api/v1/blobs/"+sha256, nil)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Authorization", "Bearer "+c.APIKey)
+
+	resp, err := c.HTTP.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return fmt.Errorf("download blob: HTTP %d", resp.StatusCode)
+	}
+
+	out, err := os.Create(destPath)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+	_, err = io.Copy(out, resp.Body)
+	return err
+}
+
+// --- internal ---
+
+func (c *Client) post(path string, body, result interface{}) error {
+	var b bytes.Buffer
+	if err := json.NewEncoder(&b).Encode(body); err != nil {
+		return err
+	}
+	req, err := http.NewRequest("POST", c.ServerURL+path, &b)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer "+c.APIKey)
+
+	resp, err := c.HTTP.Do(req)
+	if err != nil {
+		return fmt.Errorf("http: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 400 {
+		data, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("server %d: %s", resp.StatusCode, string(data))
+	}
+
+	if result != nil {
+		return json.NewDecoder(resp.Body).Decode(result)
+	}
+	return nil
+}

internal/core/sync/sync.go

@@ -0,0 +1,155 @@
+package sync
+
+import (
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"verstak/internal/core/storage"
+	"verstak/internal/core/util"
+)
+
+// Entity types (matches activity targets).
+const (
+	EntityNode    = "node"
+	EntityNote    = "note"
+	EntityFile    = "file"
+	EntityFolder  = "folder"
+	EntityAction  = "action"
+	EntityWorklog = "worklog"
+)
+
+// Op types.
+const (
+	OpCreate = "create"
+	OpUpdate = "update"
+	OpDelete = "delete"
+	OpMove   = "move"
+)
+
+// Op represents a sync operation.
+type Op struct {
+	ID          string `json:"id"`
+	OpID        string `json:"op_id"`
+	DeviceID    string `json:"device_id,omitempty"`
+	EntityType  string `json:"entity_type"`
+	EntityID    string `json:"entity_id"`
+	OpType      string `json:"op_type"`
+	PayloadJSON string `json:"payload_json"`
+	CreatedAt   string `json:"created_at"`
+	PushedAt    *string `json:"pushed_at,omitempty"`
+}
+
+// Service records and manages sync operations.
+type Service struct {
+	db       *storage.DB
+	deviceID string
+}
+
+// NewService creates a sync service.
+func NewService(db *storage.DB, deviceID string) *Service {
+	return &Service{db: db, deviceID: deviceID}
+}
+
+// RecordOp writes a sync operation to the local sync_ops table.
+func (s *Service) RecordOp(entityType, entityID, opType string, payload interface{}) error {
+	id := util.UUID7()
+	now := time.Now().UTC().Format(time.RFC3339)
+
+	var payloadStr string
+	if payload != nil {
+		b, err := json.Marshal(payload)
+		if err != nil {
+			return err
+		}
+		payloadStr = string(b)
+	}
+
+	_, err := s.db.Exec(
+		`INSERT INTO sync_ops (id, op_id, device_id, entity_type, entity_id, op_type, payload_json, created_at)
+		 VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+		id, id, s.deviceID, entityType, entityID, opType, payloadStr, now,
+	)
+	return err
+}
+
+// GetUnpushedOps returns ops that have not been pushed yet.
+func (s *Service) GetUnpushedOps() ([]Op, error) {
+	rows, err := s.db.Query(
+		`SELECT id, op_id, device_id, entity_type, entity_id, op_type, payload_json, created_at, pushed_at
+		 FROM sync_ops WHERE pushed_at IS NULL ORDER BY created_at`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	return scanOps(rows)
+}
+
+// MarkPushed marks ops as pushed to server.
+func (s *Service) MarkPushed(opIDs []string) error {
+	now := time.Now().UTC().Format(time.RFC3339)
+	for _, id := range opIDs {
+		_, err := s.db.Exec("UPDATE sync_ops SET pushed_at=? WHERE op_id=?", now, id)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// MarkApplied marks remote ops as applied locally.
+func (s *Service) MarkApplied(opIDs []string) error {
+	now := time.Now().UTC().Format(time.RFC3339)
+	for _, id := range opIDs {
+		_, err := s.db.Exec("UPDATE sync_ops SET applied_at=? WHERE op_id=?", now, id)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// GetState returns the current sync state.
+func (s *Service) GetState() (serverURL, apiKey string, lastPushRev int, lastSyncAt string, err error) {
+	err = s.db.QueryRow(
+		`SELECT server_url, api_key, last_push_rev, COALESCE(last_sync_at,'') FROM sync_state WHERE device_id=?`,
+		s.deviceID).Scan(&serverURL, &apiKey, &lastPushRev, &lastSyncAt)
+	if err == sql.ErrNoRows {
+		return "", "", 0, "", nil
+	}
+	return
+}
+
+// SetState saves sync connection state.
+func (s *Service) SetState(serverURL, apiKey string) error {
+	_, err := s.db.Exec(
+		`INSERT INTO sync_state (device_id, server_url, api_key, last_push_rev, last_sync_at)
+		 VALUES (?, ?, ?, 0, '')
+		 ON CONFLICT(device_id) DO UPDATE SET server_url=excluded.server_url, api_key=excluded.api_key`,
+		s.deviceID, serverURL, apiKey,
+	)
+	return err
+}
+
+// --- helpers ---
+
+func scanOps(rows *sql.Rows) ([]Op, error) {
+	var out []Op
+	for rows.Next() {
+		var o Op
+		var pushedAt sql.NullString
+		if err := rows.Scan(&o.ID, &o.OpID, &o.DeviceID, &o.EntityType, &o.EntityID,
+			&o.OpType, &o.PayloadJSON, &o.CreatedAt, &pushedAt); err != nil {
+			return nil, err
+		}
+		if pushedAt.Valid {
+			o.PushedAt = &pushedAt.String
+		}
+		out = append(out, o)
+	}
+	return out, rows.Err()
+}
+
+// MustVar ensures the package is not considered unused.
+var _ = fmt.Sprintf

test_smoke_sync.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+echo "=== Verstak Sync E2E Smoke Test ==="
+
+SERVER_PORT=18999
+SDIR=$(mktemp -d)
+VD=$(mktemp -d)
+cleanup() { kill "$SPID" 2>/dev/null || true; rm -rf "$SDIR" "$VD"; }
+trap cleanup EXIT
+
+echo ":: Build"
+go build -o /tmp/vs-server ./cmd/verstak-server/
+go build -o /tmp/vs-cli ./cmd/verstak/
+
+echo ":: Start server"
+/tmp/vs-server --port "$SERVER_PORT" --data "$SDIR" --admin-user admin --admin-pass pass > /dev/null 2>&1 &
+SPID=$!
+sleep 2
+
+echo ":: Health"
+curl -sf "http://localhost:$SERVER_PORT/api/v1/health" | grep -q '"ok"' && echo "  OK"
+
+echo ":: Register device"
+# Register user first
+curl -sf -X POST "http://localhost:$SERVER_PORT/api/v1/auth/register" \
+  -H "Content-Type: application/json" \
+  -d '{"username":"smokeuser","email":"smoke@test.local","password":"mypass123"}' > /dev/null
+# Confirm email
+TOKEN=$(sqlite3 "$SDIR/server.db" "SELECT token FROM server_email_tokens WHERE purpose='confirm' LIMIT 1")
+curl -sf "http://localhost:$SERVER_PORT/api/v1/auth/confirm?token=$TOKEN" > /dev/null
+# Register device with user creds
+REG=$(curl -sf -X POST "http://localhost:$SERVER_PORT/api/v1/device/register" \
+  -H "Content-Type: application/json" -d '{"name":"smoke","username":"smokeuser","password":"mypass123"}')
+DID=$(echo "$REG" | python3 -c "import sys,json;print(json.load(sys.stdin)['device_id'])")
+AKEY=$(echo "$REG" | python3 -c "import sys,json;print(json.load(sys.stdin)['api_key'])")
+echo "  device=$DID"
+
+echo ":: Init vault"
+/tmp/vs-cli init --vault "$VD"
+
+echo ":: Configure sync"
+cat > "$VD/.verstak/config.yml" <<YML
+sync:
+  server_url: http://localhost:$SERVER_PORT
+  api_key: $AKEY
+  device_id: $DID
+  auto_sync: false
+YML
+
+echo ":: Insert sync op (simulate recorded op)"
+sqlite3 "$VD/.verstak/index.db" \
+  "INSERT INTO sync_ops (id, op_id, device_id, entity_type, entity_id, op_type, payload_json, created_at) VALUES ('e1','e1','$DID','node','n1','create','{\"title\":\"t\"}',datetime('now'));"
+
+echo ":: Push"
+/tmp/vs-cli sync push --vault "$VD" | grep -q "Pushed 1" && echo "  OK"
+
+echo ":: Pull"
+/tmp/vs-cli sync pull --vault "$VD" | grep -q "Pulled" && echo "  OK"
+
+echo ":: Status"
+/tmp/vs-cli sync status --vault "$VD"
+
+echo ""
+echo "=== ALL TESTS PASSED ==="