refactor(backend): split project write responsibilities

2026-07-21 15:27:11 +08:00
parent 9e862f2a7f
commit 1fcbb31301
18 changed files with 1025 additions and 649 deletions
--- a/backend/cmd/api/main.go
+++ b/backend/cmd/api/main.go
@@ -9,6 +9,7 @@ import (
 	"senlinai-agent/backend/internal/logic/files"
 	"senlinai-agent/backend/internal/logic/inbox"
 	"senlinai-agent/backend/internal/logic/projects"
+	"senlinai-agent/backend/internal/logic/tasks"
 	"senlinai-agent/backend/internal/models"
 )

@@ -21,10 +22,28 @@ func main() {
 	}

 	authService := auth.NewService(cfg.AuthSecret)
-	projectHandler := projects.NewHandler(projects.NewService(), files.NewService(cfg.StorageDir))
+	projectService := projects.NewService()
+	fileService := files.NewService(cfg.StorageDir, models.DBService)
+	taskService := tasks.NewService(models.DBService)
+	projectHandler := projects.NewHandler(projectService)
+	tagHandler := projects.NewTagHandler(projectService)
+	cronHandler := projects.NewCronHandler(projectService)
+	taskHandler := tasks.NewHandler(taskService)
+	fileHandler := files.NewHandler(fileService)
 	inboxHandler := inbox.NewHandler(inbox.NewService(inbox.StaticAnalyzer{}))
 	authHandler := auth.NewHandler(authService)
-	appRouter := httpx.NewProtectedRouter(cfg, authService.VerifySession, authHandler, projectHandler, inboxHandler)
+	// search 与 AI 当前只有 service，尚无 HTTP registrar；后续功能任务应在实现真实契约后从此处注入，不能注册伪端点。
+	appRouter := httpx.NewProtectedRouter(
+		cfg,
+		authService.VerifySession,
+		authHandler,
+		projectHandler,
+		tagHandler,
+		cronHandler,
+		taskHandler,
+		fileHandler,
+		inboxHandler,
+	)
 	if err := appRouter.Run(":" + cfg.Port); err != nil {
 		log.Fatal(err)
 	}
--- a/backend/internal/httpx/router_integration_test.go
+++ b/backend/internal/httpx/router_integration_test.go
@@ -6,16 +6,23 @@ import (
 	"github.com/stretchr/testify/require"
 	"senlinai-agent/backend/internal/config"
 	"senlinai-agent/backend/internal/httpx"
+	"senlinai-agent/backend/internal/logic/files"
 	"senlinai-agent/backend/internal/logic/inbox"
 	"senlinai-agent/backend/internal/logic/projects"
+	"senlinai-agent/backend/internal/logic/tasks"
 )

-func TestProjectAndInboxRoutesRegisterTogether(t *testing.T) {
+func TestBackendFeatureRoutesRegisterTogether(t *testing.T) {
 	require.NotPanics(t, func() {
+		projectService := projects.NewService()
 		httpx.NewProtectedRouter(
 			config.Config{Env: "test"},
 			func(token string) (uint, error) { return 1, nil },
-			projects.NewHandler(projects.NewService()),
+			projects.NewHandler(projectService),
+			projects.NewTagHandler(projectService),
+			projects.NewCronHandler(projectService),
+			tasks.NewHandler(tasks.NewService()),
+			files.NewHandler(files.NewService(t.TempDir())),
 			inbox.NewHandler(inbox.NewService(inbox.StaticAnalyzer{})),
 		)
 	})
--- a/backend/internal/logic/files/handlers.go
+++ b/backend/internal/logic/files/handlers.go
@@ -0,0 +1,101 @@
+package files
+
+import (
+	"errors"
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+	"senlinai-agent/backend/internal/httpx"
+	"senlinai-agent/backend/internal/logic/auth"
+	"senlinai-agent/backend/internal/logic/projects"
+	"senlinai-agent/backend/internal/models"
+)
+
+// SourceDTO 是文件资料写接口的稳定响应，仅包含可公开的相对存储路径。
+type SourceDTO struct {
+	ID        string    `json:"id"`
+	ProjectID string    `json:"projectId"`
+	Kind      string    `json:"kind"`
+	Title     string    `json:"title"`
+	FilePath  string    `json:"filePath"`
+	CreatedAt time.Time `json:"createdAt"`
+	UpdatedAt time.Time `json:"updatedAt"`
+}
+
+// Handler 负责 multipart 边界，文件名清理和本地路径构造始终委托给 Service。
+type Handler struct {
+	service *Service
+}
+
+// NewHandler 创建文件资料 HTTP registrar。
+func NewHandler(service *Service) *Handler {
+	return &Handler{service: service}
+}
+
+// Register 将文件资料上传接口注册到上层提供的 /api/v1 路由组。
+func (h *Handler) Register(router gin.IRouter) {
+	router.POST("/projects/:id/sources", h.upload)
+}
+
+func (h *Handler) upload(c *gin.Context) {
+	userID, ok := auth.CurrentUserID(c)
+	if !ok {
+		httpx.Error(c, http.StatusUnauthorized, "unauthorized", "未登录或登录已失效")
+		return
+	}
+	projectIdentity, ok := httpx.IdentityParam(c, "id")
+	if !ok {
+		return
+	}
+	// 所有权必须在写磁盘前校验，防止越权请求留下孤立文件。
+	project, err := projects.FindOwnedProject(userID, projectIdentity)
+	if err != nil {
+		writeSourceError(c, err)
+		return
+	}
+	fileHeader, err := c.FormFile("file")
+	if err != nil {
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "请选择要上传的文件")
+		return
+	}
+	file, err := fileHeader.Open()
+	if err != nil {
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "文件读取失败")
+		return
+	}
+	defer file.Close()
+
+	// 先由文件服务保存内容，再用其返回的相对路径创建资料记录；handler 不拼接任何本地路径。
+	stored, err := h.service.Save(project.ID, fileHeader.Filename, file)
+	if err != nil {
+		httpx.Error(c, http.StatusInternalServerError, "internal_error", "文件保存失败")
+		return
+	}
+	source, err := h.service.CreateSource(userID, project, c.PostForm("title"), stored)
+	if err != nil {
+		writeSourceError(c, err)
+		return
+	}
+	c.JSON(http.StatusCreated, sourceDTO(*source))
+}
+
+func sourceDTO(source models.SenlinAgentSource) SourceDTO {
+	return SourceDTO{
+		ID: source.Identity, ProjectID: source.ProjectIdentity, Kind: source.Kind,
+		Title: source.Title, FilePath: source.FilePath,
+		CreatedAt: source.CreatedAt.UTC(), UpdatedAt: source.UpdatedAt.UTC(),
+	}
+}
+
+func writeSourceError(c *gin.Context, err error) {
+	switch {
+	case errors.Is(err, gorm.ErrRecordNotFound):
+		httpx.Error(c, http.StatusNotFound, "not_found", "项目不存在")
+	case errors.Is(err, ErrSourceTitleRequired), errors.Is(err, ErrSourcePathRequired):
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "资料参数无效")
+	default:
+		httpx.Error(c, http.StatusInternalServerError, "internal_error", "资料创建失败")
+	}
+}
--- a/backend/internal/logic/files/handlers_test.go
+++ b/backend/internal/logic/files/handlers_test.go
@@ -0,0 +1,96 @@
+package files
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"mime/multipart"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/glebarez/sqlite"
+	"github.com/stretchr/testify/require"
+	"gorm.io/gorm"
+	"senlinai-agent/backend/internal/config"
+	"senlinai-agent/backend/internal/httpx"
+	"senlinai-agent/backend/internal/models"
+)
+
+func TestFileRegistrarSavesBeforeCreatingIdentitySourceDTO(t *testing.T) {
+	router, database, project, storageRoot := newFileHandlerTestRouter(t, 1, 1)
+	body := &bytes.Buffer{}
+	writer := multipart.NewWriter(body)
+	require.NoError(t, writer.WriteField("title", "客户资料"))
+	part, err := writer.CreateFormFile("file", "客户资料.txt")
+	require.NoError(t, err)
+	_, err = part.Write([]byte("private content"))
+	require.NoError(t, err)
+	require.NoError(t, writer.Close())
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/"+project.Identity+"/sources", body)
+	req.Header.Set("Content-Type", writer.FormDataContentType())
+	req.Header.Set("Authorization", "Bearer test-token")
+	rec := httptest.NewRecorder()
+
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusCreated, rec.Code, rec.Body.String())
+	var source models.SenlinAgentSource
+	require.NoError(t, database.Where("project_id = ?", project.ID).First(&source).Error)
+	require.FileExists(t, filepath.Join(storageRoot, filepath.FromSlash(source.FilePath)))
+	var payload map[string]any
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &payload))
+	require.Equal(t, source.Identity, payload["id"])
+	require.Equal(t, project.Identity, payload["projectId"])
+	require.Equal(t, filepath.ToSlash(source.FilePath), payload["filePath"])
+	require.NotContains(t, payload["filePath"], storageRoot)
+	require.NotContains(t, payload, "AbsolutePath")
+	require.NotContains(t, rec.Body.String(), storageRoot)
+}
+
+func TestFileRegistrarChecksOwnershipBeforeWritingFile(t *testing.T) {
+	router, database, project, storageRoot := newFileHandlerTestRouter(t, 1, 2)
+	body := &bytes.Buffer{}
+	writer := multipart.NewWriter(body)
+	part, err := writer.CreateFormFile("file", "hidden.txt")
+	require.NoError(t, err)
+	_, err = part.Write([]byte("must not be stored"))
+	require.NoError(t, err)
+	require.NoError(t, writer.Close())
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/"+project.Identity+"/sources", body)
+	req.Header.Set("Content-Type", writer.FormDataContentType())
+	req.Header.Set("Authorization", "Bearer test-token")
+	rec := httptest.NewRecorder()
+
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusNotFound, rec.Code, rec.Body.String())
+	var count int64
+	require.NoError(t, database.Model(&models.SenlinAgentSource{}).Count(&count).Error)
+	require.Zero(t, count)
+	entries, err := os.ReadDir(storageRoot)
+	require.NoError(t, err)
+	require.Empty(t, entries)
+}
+
+func newFileHandlerTestRouter(t *testing.T, currentUserID, ownerID uint) (*gin.Engine, *gorm.DB, models.SenlinAgentProject, string) {
+	t.Helper()
+	database, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())), &gorm.Config{TranslateError: true})
+	require.NoError(t, err)
+	require.NoError(t, models.AutoMigrate(database))
+	models.DBService = database
+	require.NoError(t, database.Create(&models.SenlinAgentUser{Email: "owner@example.com", DisplayName: "Owner", PasswordHash: "hash"}).Error)
+	require.NoError(t, database.Create(&models.SenlinAgentUser{Email: "other@example.com", DisplayName: "Other", PasswordHash: "hash"}).Error)
+	project := models.SenlinAgentProject{OwnerID: ownerID, Name: "Files", Identifier: fmt.Sprintf("FILES-%d", ownerID)}
+	require.NoError(t, database.Create(&project).Error)
+	storageRoot := t.TempDir()
+	router := httpx.NewProtectedRouter(
+		config.Config{Env: "test"},
+		func(string) (uint, error) { return currentUserID, nil },
+		NewHandler(NewService(storageRoot, database)),
+	)
+	return router, database, project, storageRoot
+}
--- a/backend/internal/logic/files/service.go
+++ b/backend/internal/logic/files/service.go
@@ -1,16 +1,21 @@
 package files

 import (
+	"errors"
 	"fmt"
 	"io"
 	"os"
 	"path/filepath"
 	"strings"
 	"time"
+
+	"gorm.io/gorm"
+	"senlinai-agent/backend/internal/models"
 )

 type Service struct {
 	root string
+	db   *gorm.DB
 }

 type StoredFile struct {
@@ -19,10 +24,16 @@ type StoredFile struct {
 	AbsolutePath string
 }

-func NewService(root string) *Service {
-	return &Service{root: root}
+// NewService 集中持有存储根目录；任何服务端本地路径都只能由该服务构造。
+func NewService(root string, databases ...*gorm.DB) *Service {
+	var database *gorm.DB
+	if len(databases) > 0 {
+		database = databases[0]
+	}
+	return &Service{root: root, db: database}
 }

+// Save 清理客户端文件名，并只返回供持久化的相对路径；绝对路径不得进入 API DTO。
 func (s *Service) Save(projectID uint, originalName string, content io.Reader) (StoredFile, error) {
 	cleanName := filepath.Base(strings.ReplaceAll(strings.TrimSpace(originalName), "\\", "/"))
 	if cleanName == "." || cleanName == "" {
@@ -43,3 +54,38 @@ func (s *Service) Save(projectID uint, originalName string, content io.Reader) (
 	}
 	return StoredFile{OriginalName: cleanName, RelativePath: relative, AbsolutePath: absolute}, nil
 }
+
+func (s *Service) database() *gorm.DB {
+	if s.db != nil {
+		return s.db
+	}
+	return models.DBService
+}
+
+var (
+	ErrSourceTitleRequired = errors.New("source title is required")
+	ErrSourcePathRequired  = errors.New("source file path is required")
+)
+
+// CreateSource 只持久化 Save 产生的相对路径，不接受 handler 自行拼接本地路径。
+func (s *Service) CreateSource(ownerID uint, project *models.SenlinAgentProject, title string, stored StoredFile) (*models.SenlinAgentSource, error) {
+	title = strings.TrimSpace(title)
+	if title == "" {
+		title = stored.OriginalName
+	}
+	if title == "" {
+		return nil, ErrSourceTitleRequired
+	}
+	relativePath := filepath.ToSlash(strings.TrimSpace(stored.RelativePath))
+	if relativePath == "" || filepath.IsAbs(relativePath) {
+		return nil, ErrSourcePathRequired
+	}
+	source := &models.SenlinAgentSource{
+		ProjectID: project.ID, ProjectIdentity: project.Identity, CreatedBy: ownerID,
+		Kind: "file", Title: title, FilePath: relativePath,
+	}
+	if err := s.database().Create(source).Error; err != nil {
+		return nil, err
+	}
+	return source, nil
+}
--- a/backend/internal/logic/inbox/service.go
+++ b/backend/internal/logic/inbox/service.go
@@ -77,6 +77,7 @@ func (s *Service) Confirm(itemID uint, selected []Suggestion) error {
 			return err
 		}
 		sourceInboxItemID := item.ID
+		// Inbox 建议只有在用户确认后才创建正式对象，并把来源 ID 写入每个对象以保留可追溯性。
 		for _, suggestion := range selected {
 			switch suggestion.Kind {
 			case "task":
--- a/backend/internal/logic/projects/cron_handlers.go
+++ b/backend/internal/logic/projects/cron_handlers.go
@@ -0,0 +1,98 @@
+package projects
+
+import (
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"senlinai-agent/backend/internal/httpx"
+	"senlinai-agent/backend/internal/models"
+)
+
+// CronPlanDTO 是计划任务管理响应；MVP 只管理提醒元数据，不执行自主 Agent。
+type CronPlanDTO struct {
+	ID         string     `json:"id"`
+	ProjectID  string     `json:"projectId"`
+	Title      string     `json:"title"`
+	Schedule   string     `json:"schedule"`
+	NextRunAt  *time.Time `json:"nextRunAt"`
+	Enabled    bool       `json:"enabled"`
+	LastResult string     `json:"lastResult"`
+	CreatedAt  time.Time  `json:"createdAt"`
+	UpdatedAt  time.Time  `json:"updatedAt"`
+}
+
+// CronHandler 单独承载计划任务写接口。
+type CronHandler struct {
+	service *Service
+}
+
+// NewCronHandler 创建计划任务 HTTP registrar。
+func NewCronHandler(service *Service) *CronHandler {
+	return &CronHandler{service: service}
+}
+
+// Register 注册项目内计划任务创建接口。
+func (h *CronHandler) Register(router gin.IRouter) {
+	router.POST("/projects/:id/cron-plans", h.create)
+}
+
+func (h *CronHandler) create(c *gin.Context) {
+	userID, project, ok := ownedProjectFromRequest(c)
+	if !ok {
+		return
+	}
+	var input struct {
+		Title     string `json:"title"`
+		Schedule  string `json:"schedule"`
+		Enabled   bool   `json:"enabled"`
+		NextRunAt string `json:"nextRunAt"`
+	}
+	if err := c.ShouldBindJSON(&input); err != nil {
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "请求参数无效")
+		return
+	}
+	nextRunAt, err := parseCronOptionalTime(input.NextRunAt)
+	if err != nil {
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "下次运行时间格式无效")
+		return
+	}
+	plan, err := h.service.CreateCronPlan(userID, project.ID, CreateCronPlanInput{
+		Title: input.Title, Schedule: input.Schedule, Enabled: input.Enabled, NextRunAt: nextRunAt,
+	})
+	if err != nil {
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "计划任务参数无效")
+		return
+	}
+	c.JSON(http.StatusCreated, cronPlanDTO(*plan))
+}
+
+func cronPlanDTO(plan models.SenlinAgentCronPlan) CronPlanDTO {
+	return CronPlanDTO{
+		ID: plan.Identity, ProjectID: plan.ProjectIdentity, Title: plan.Title, Schedule: plan.Schedule,
+		NextRunAt: projectUTCOptionalTime(plan.NextRunAt), Enabled: plan.Enabled, LastResult: plan.LastResult,
+		CreatedAt: plan.CreatedAt.UTC(), UpdatedAt: plan.UpdatedAt.UTC(),
+	}
+}
+
+func parseCronOptionalTime(value string) (*time.Time, error) {
+	trimmed := strings.TrimSpace(value)
+	if trimmed == "" {
+		return nil, nil
+	}
+	parsed, err := time.Parse(time.RFC3339, trimmed)
+	if err != nil {
+		return nil, err
+	}
+	parsed = parsed.UTC()
+	return &parsed, nil
+}
+
+func projectUTCOptionalTime(value *time.Time) *time.Time {
+	if value == nil {
+		return nil
+	}
+	result := value.UTC()
+	return &result
+}
--- a/backend/internal/logic/projects/dto.go
+++ b/backend/internal/logic/projects/dto.go
@@ -34,28 +34,6 @@ type UpdateProjectRequest struct {
 	Description *string `json:"description"`
 }

-type CreateTaskInput struct {
-	Title       string
-	Description string
-	Status      string
-	DueAt       *time.Time
-	Tag         string
-}
-
-type UpdateTaskInput struct {
-	Title         string
-	Description   string
-	Status        string
-	Completed     bool
-	NextProjectID uint
-	Tag           string
-}
-
-type CreateFileSourceInput struct {
-	Title    string
-	FilePath string
-}
-
 type CreateCronPlanInput struct {
 	Title     string
 	Schedule  string
--- a/backend/internal/logic/projects/handlers.go
+++ b/backend/internal/logic/projects/handlers.go
@@ -3,43 +3,30 @@ package projects
 import (
 	"errors"
 	"net/http"
-	"strconv"
-	"strings"
-	"time"

 	"github.com/gin-gonic/gin"
 	"gorm.io/gorm"
 	"senlinai-agent/backend/internal/httpx"
 	"senlinai-agent/backend/internal/logic/auth"
-	"senlinai-agent/backend/internal/logic/files"
 )

+// Handler 仅负责项目核心读写和工作区读取；任务、标签、资料、计划任务由各自 registrar 承担。
 type Handler struct {
-	service     *Service
-	fileService *files.Service
+	service *Service
 }

-func NewHandler(service *Service, fileServices ...*files.Service) *Handler {
-	var fileService *files.Service
-	if len(fileServices) > 0 {
-		fileService = fileServices[0]
-	}
-	return &Handler{service: service, fileService: fileService}
+// NewHandler 创建项目核心 HTTP registrar。
+func NewHandler(service *Service) *Handler {
+	return &Handler{service: service}
 }

+// Register 将项目核心接口注册到上层提供的 /api/v1 路由组。
 func (h *Handler) Register(router gin.IRouter) {
 	router.POST("/projects", h.createProject)
 	router.GET("/projects", h.listProjects)
 	router.GET("/projects/:id", h.getProject)
 	router.PATCH("/projects/:id", h.updateProject)
-	router.GET("/projects/:id/dashboard", h.dashboard)
 	router.GET("/projects/:id/workspace", h.workspace)
-	router.GET("/projects/:id/tags", h.listTags)
-	router.POST("/projects/:id/tasks", h.createTask)
-	router.PATCH("/projects/:id/tasks/:taskID", h.updateTask)
-	router.POST("/projects/:id/sources", h.uploadSource)
-	router.POST("/projects/:id/cron-plans", h.createCronPlan)
-	router.POST("/projects/:id/tags", h.createTag)
 }

 func (h *Handler) createProject(c *gin.Context) {
@@ -115,29 +102,10 @@ func (h *Handler) updateProject(c *gin.Context) {
 	c.Status(http.StatusNoContent)
 }

-func (h *Handler) dashboard(c *gin.Context) {
-	userID, ok := auth.CurrentUserID(c)
-	if !ok {
-		c.JSON(http.StatusUnauthorized, gin.H{"error": "missing current user"})
-		return
-	}
-	projectID, err := strconv.ParseUint(c.Param("id"), 10, 64)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid project id"})
-		return
-	}
-	dashboard, err := h.service.Dashboard(userID, uint(projectID))
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to load dashboard"})
-		return
-	}
-	c.JSON(http.StatusOK, dashboard)
-}
-
 func (h *Handler) workspace(c *gin.Context) {
 	userID, ok := auth.CurrentUserID(c)
 	if !ok {
-		c.JSON(http.StatusUnauthorized, gin.H{"error": "missing current user"})
+		httpx.Error(c, http.StatusUnauthorized, "unauthorized", "未登录或登录已失效")
 		return
 	}
 	projectIdentity, ok := httpx.IdentityParam(c, "id")
@@ -152,226 +120,6 @@ func (h *Handler) workspace(c *gin.Context) {
 	c.JSON(http.StatusOK, workspace)
 }

-func (h *Handler) listTags(c *gin.Context) {
-	userID, ok := auth.CurrentUserID(c)
-	if !ok {
-		c.JSON(http.StatusUnauthorized, gin.H{"error": "missing current user"})
-		return
-	}
-	projectID, ok := parseProjectID(c)
-	if !ok {
-		return
-	}
-	tags, err := h.service.ListProjectTags(userID, projectID)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		return
-	}
-	c.JSON(http.StatusOK, tags)
-}
-
-func (h *Handler) createTask(c *gin.Context) {
-	userID, ok := auth.CurrentUserID(c)
-	if !ok {
-		c.JSON(http.StatusUnauthorized, gin.H{"error": "missing current user"})
-		return
-	}
-	projectID, ok := parseProjectID(c)
-	if !ok {
-		return
-	}
-	var input struct {
-		Title       string `json:"title"`
-		Description string `json:"description"`
-		Status      string `json:"status"`
-		DueAt       string `json:"dueAt"`
-		Tag         string `json:"tag"`
-	}
-	if err := c.ShouldBindJSON(&input); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request"})
-		return
-	}
-	dueAt, err := parseOptionalTime(input.DueAt)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid dueAt"})
-		return
-	}
-	task, err := h.service.CreateTask(userID, projectID, CreateTaskInput{
-		Title:       input.Title,
-		Description: input.Description,
-		Status:      input.Status,
-		DueAt:       dueAt,
-		Tag:         input.Tag,
-	})
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		return
-	}
-	c.JSON(http.StatusCreated, task)
-}
-
-func (h *Handler) updateTask(c *gin.Context) {
-	userID, ok := auth.CurrentUserID(c)
-	if !ok {
-		c.JSON(http.StatusUnauthorized, gin.H{"error": "missing current user"})
-		return
-	}
-	projectID, ok := parseProjectID(c)
-	if !ok {
-		return
-	}
-	taskID, ok := parseTaskID(c)
-	if !ok {
-		return
-	}
-	var input struct {
-		Title         string `json:"title"`
-		Description   string `json:"description"`
-		Status        string `json:"status"`
-		Completed     bool   `json:"completed"`
-		NextProjectID uint   `json:"nextProjectId"`
-		Tag           string `json:"tag"`
-	}
-	if err := c.ShouldBindJSON(&input); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request"})
-		return
-	}
-	task, err := h.service.UpdateTask(userID, projectID, taskID, UpdateTaskInput{
-		Title:         input.Title,
-		Description:   input.Description,
-		Status:        input.Status,
-		Completed:     input.Completed,
-		NextProjectID: input.NextProjectID,
-		Tag:           input.Tag,
-	})
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		return
-	}
-	c.JSON(http.StatusOK, task)
-}
-
-func (h *Handler) uploadSource(c *gin.Context) {
-	userID, ok := auth.CurrentUserID(c)
-	if !ok {
-		c.JSON(http.StatusUnauthorized, gin.H{"error": "missing current user"})
-		return
-	}
-	if h.fileService == nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": "file service is not configured"})
-		return
-	}
-	projectID, ok := parseProjectID(c)
-	if !ok {
-		return
-	}
-	if err := ensureProjectOwner(userID, projectID); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		return
-	}
-	fileHeader, err := c.FormFile("file")
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "file is required"})
-		return
-	}
-	file, err := fileHeader.Open()
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "failed to read file"})
-		return
-	}
-	defer file.Close()
-	stored, err := h.fileService.Save(projectID, fileHeader.Filename, file)
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to store file"})
-		return
-	}
-	title := c.PostForm("title")
-	if strings.TrimSpace(title) == "" {
-		title = stored.OriginalName
-	}
-	source, err := h.service.CreateFileSource(userID, projectID, CreateFileSourceInput{
-		Title:    title,
-		FilePath: stored.RelativePath,
-	})
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		return
-	}
-	c.JSON(http.StatusCreated, source)
-}
-
-func (h *Handler) createCronPlan(c *gin.Context) {
-	userID, ok := auth.CurrentUserID(c)
-	if !ok {
-		c.JSON(http.StatusUnauthorized, gin.H{"error": "missing current user"})
-		return
-	}
-	projectID, ok := parseProjectID(c)
-	if !ok {
-		return
-	}
-	var input struct {
-		Title     string `json:"title"`
-		Schedule  string `json:"schedule"`
-		Enabled   bool   `json:"enabled"`
-		NextRunAt string `json:"nextRunAt"`
-	}
-	if err := c.ShouldBindJSON(&input); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request"})
-		return
-	}
-	nextRunAt, err := parseOptionalTime(input.NextRunAt)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid nextRunAt"})
-		return
-	}
-	plan, err := h.service.CreateCronPlan(userID, projectID, CreateCronPlanInput{
-		Title:     input.Title,
-		Schedule:  input.Schedule,
-		Enabled:   input.Enabled,
-		NextRunAt: nextRunAt,
-	})
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		return
-	}
-	c.JSON(http.StatusCreated, plan)
-}
-
-func (h *Handler) createTag(c *gin.Context) {
-	userID, ok := auth.CurrentUserID(c)
-	if !ok {
-		c.JSON(http.StatusUnauthorized, gin.H{"error": "missing current user"})
-		return
-	}
-	projectID, ok := parseProjectID(c)
-	if !ok {
-		return
-	}
-	var input struct {
-		Name string `json:"name"`
-	}
-	if err := c.ShouldBindJSON(&input); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request"})
-		return
-	}
-	tag, err := h.service.CreateProjectTag(userID, projectID, input.Name)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		return
-	}
-	c.JSON(http.StatusCreated, tag)
-}
-
-func parseProjectID(c *gin.Context) (uint, bool) {
-	projectID, err := strconv.ParseUint(c.Param("id"), 10, 64)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid project id"})
-		return 0, false
-	}
-	return uint(projectID), true
-}
-
 func writeProjectError(c *gin.Context, err error) {
 	switch {
 	case errors.Is(err, gorm.ErrRecordNotFound):
@@ -384,24 +132,3 @@ func writeProjectError(c *gin.Context, err error) {
 		httpx.Error(c, http.StatusInternalServerError, "internal_error", "项目操作失败")
 	}
 }
-
-func parseTaskID(c *gin.Context) (uint, bool) {
-	taskID, err := strconv.ParseUint(c.Param("taskID"), 10, 64)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid task id"})
-		return 0, false
-	}
-	return uint(taskID), true
-}
-
-func parseOptionalTime(value string) (*time.Time, error) {
-	trimmed := strings.TrimSpace(value)
-	if trimmed == "" {
-		return nil, nil
-	}
-	parsed, err := time.Parse(time.RFC3339, trimmed)
-	if err != nil {
-		return nil, err
-	}
-	return &parsed, nil
-}
--- a/backend/internal/logic/projects/handlers_test.go
+++ b/backend/internal/logic/projects/handlers_test.go
@@ -3,17 +3,14 @@ package projects
 import (
 	"bytes"
 	"encoding/json"
-	"mime/multipart"
 	"net/http"
 	"net/http/httptest"
-	"path/filepath"
 	"testing"

 	"github.com/gin-gonic/gin"
 	"github.com/stretchr/testify/require"
 	"senlinai-agent/backend/internal/config"
 	"senlinai-agent/backend/internal/httpx"
-	"senlinai-agent/backend/internal/logic/files"
 	"senlinai-agent/backend/internal/models"
 )

@@ -215,123 +212,6 @@ func TestUpdateProject(t *testing.T) {
 	})
 }

-func TestCreateTaskHandlerPersistsTask(t *testing.T) {
-	router, project, _ := newProjectsHandlerTestRouter(t)
-	body, err := json.Marshal(gin.H{"title": "整理需求", "description": "形成任务清单", "dueAt": "2026-07-21T09:30:00Z", "tag": "需求"})
-	require.NoError(t, err)
-	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/1/tasks", bytes.NewReader(body))
-	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("Authorization", "Bearer test-token")
-	rec := httptest.NewRecorder()
-
-	router.ServeHTTP(rec, req)
-
-	require.Equal(t, http.StatusCreated, rec.Code)
-	var task models.SenlinAgentTask
-	require.NoError(t, models.DBService.Where("project_id = ? AND title = ?", project.ID, "整理需求").First(&task).Error)
-	require.Equal(t, "open", task.Status)
-	require.NotNil(t, task.DueAt)
-	require.NotNil(t, task.TagID)
-}
-
-func TestUploadSourceHandlerStoresFileAndSource(t *testing.T) {
-	router, project, storageDir := newProjectsHandlerTestRouter(t)
-	body := &bytes.Buffer{}
-	writer := multipart.NewWriter(body)
-	require.NoError(t, writer.WriteField("title", "客户资料.txt"))
-	fileWriter, err := writer.CreateFormFile("file", "客户资料.txt")
-	require.NoError(t, err)
-	_, err = fileWriter.Write([]byte("hello"))
-	require.NoError(t, err)
-	require.NoError(t, writer.Close())
-	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/1/sources", body)
-	req.Header.Set("Content-Type", writer.FormDataContentType())
-	req.Header.Set("Authorization", "Bearer test-token")
-	rec := httptest.NewRecorder()
-
-	router.ServeHTTP(rec, req)
-
-	require.Equal(t, http.StatusCreated, rec.Code)
-	var source models.SenlinAgentSource
-	require.NoError(t, models.DBService.Where("project_id = ? AND kind = ?", project.ID, "file").First(&source).Error)
-	require.Equal(t, "客户资料.txt", source.Title)
-	require.NotEmpty(t, source.FilePath)
-	require.FileExists(t, filepath.Join(storageDir, source.FilePath))
-}
-
-func TestCreateCronPlanHandlerPersistsPlan(t *testing.T) {
-	router, project, _ := newProjectsHandlerTestRouter(t)
-	body, err := json.Marshal(gin.H{"title": "每日整理", "schedule": "0 9 * * *", "enabled": true, "nextRunAt": "2026-07-22T08:00:00Z"})
-	require.NoError(t, err)
-	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/1/cron-plans", bytes.NewReader(body))
-	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("Authorization", "Bearer test-token")
-	rec := httptest.NewRecorder()
-
-	router.ServeHTTP(rec, req)
-
-	require.Equal(t, http.StatusCreated, rec.Code)
-	var plan models.SenlinAgentCronPlan
-	require.NoError(t, models.DBService.Where("project_id = ? AND title = ?", project.ID, "每日整理").First(&plan).Error)
-	require.Equal(t, "0 9 * * *", plan.Schedule)
-	require.True(t, plan.Enabled)
-	require.NotNil(t, plan.NextRunAt)
-}
-
-func TestCreateTagHandlerPersistsProjectTag(t *testing.T) {
-	router, project, _ := newProjectsHandlerTestRouter(t)
-	body, err := json.Marshal(gin.H{"name": "Design"})
-	require.NoError(t, err)
-	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/1/tags", bytes.NewReader(body))
-	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("Authorization", "Bearer test-token")
-	rec := httptest.NewRecorder()
-
-	router.ServeHTTP(rec, req)
-
-	require.Equal(t, http.StatusCreated, rec.Code)
-	var tag models.SenlinAgentTag
-	require.NoError(t, models.DBService.Where("project_id = ? AND name = ?", project.ID, "Design").First(&tag).Error)
-	require.Equal(t, project.ID, tag.ProjectID)
-}
-
-func TestListTagsHandlerReturnsProjectTags(t *testing.T) {
-	router, project, _ := newProjectsHandlerTestRouter(t)
-	require.NoError(t, models.DBService.Create(&models.SenlinAgentTag{ProjectID: project.ID, Name: "Design"}).Error)
-	req := httptest.NewRequest(http.MethodGet, "/api/v1/projects/1/tags", nil)
-	req.Header.Set("Authorization", "Bearer test-token")
-	rec := httptest.NewRecorder()
-
-	router.ServeHTTP(rec, req)
-
-	require.Equal(t, http.StatusOK, rec.Code)
-	var tags []models.SenlinAgentTag
-	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &tags))
-	require.Len(t, tags, 1)
-	require.Equal(t, "Design", tags[0].Name)
-}
-
-func TestUpdateTaskHandlerPersistsTagAndStatus(t *testing.T) {
-	router, project, _ := newProjectsHandlerTestRouter(t)
-	task := models.SenlinAgentTask{ProjectID: project.ID, CreatedBy: 1, Title: "Draft", Status: "open"}
-	require.NoError(t, models.DBService.Create(&task).Error)
-	body, err := json.Marshal(gin.H{"title": "Draft v2", "description": "Updated", "completed": true, "tag": "Important"})
-	require.NoError(t, err)
-	req := httptest.NewRequest(http.MethodPatch, "/api/v1/projects/1/tasks/1", bytes.NewReader(body))
-	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("Authorization", "Bearer test-token")
-	rec := httptest.NewRecorder()
-
-	router.ServeHTTP(rec, req)
-
-	require.Equal(t, http.StatusOK, rec.Code)
-	var updated models.SenlinAgentTask
-	require.NoError(t, models.DBService.First(&updated, task.ID).Error)
-	require.Equal(t, "Draft v2", updated.Title)
-	require.Equal(t, "done", updated.Status)
-	require.NotNil(t, updated.TagID)
-}
-
 func newProjectsHandlerTestRouter(t *testing.T) (*gin.Engine, *models.SenlinAgentProject, string) {
 	t.Helper()
 	newTestDB(t)
@@ -339,13 +219,12 @@ func newProjectsHandlerTestRouter(t *testing.T) (*gin.Engine, *models.SenlinAgen
 	service := NewService()
 	project, err := service.CreateProject(1, "Alpha", "")
 	require.NoError(t, err)
-	storageDir := t.TempDir()
 	router := httpx.NewProtectedRouter(
 		config.Config{Env: "test"},
 		func(token string) (uint, error) { return 1, nil },
-		NewHandler(service, files.NewService(storageDir)),
+		NewHandler(service),
 	)
-	return router, project, storageDir
+	return router, project, ""
 }

 func mapKeys(value map[string]any) []string {
--- a/backend/internal/logic/projects/object_crud.go
+++ b/backend/internal/logic/projects/object_crud.go
@@ -8,97 +8,6 @@ import (
 	"senlinai-agent/backend/internal/models"
 )

-func (s *Service) CreateTask(ownerID uint, projectID uint, input CreateTaskInput) (*models.SenlinAgentTask, error) {
-	if err := ensureProjectOwner(ownerID, projectID); err != nil {
-		return nil, err
-	}
-	title := strings.TrimSpace(input.Title)
-	if title == "" {
-		return nil, errors.New("task title is required")
-	}
-	status := strings.TrimSpace(input.Status)
-	if status == "" {
-		status = "open"
-	}
-	tagID, err := s.findOrCreateTagID(projectID, input.Tag)
-	if err != nil {
-		return nil, err
-	}
-	task := &models.SenlinAgentTask{
-		ProjectID: projectID, CreatedBy: ownerID, TagID: tagID, Title: title,
-		Description: strings.TrimSpace(input.Description), Status: status, DueAt: input.DueAt,
-	}
-	return task, models.DBService.Create(task).Error
-}
-
-func (s *Service) UpdateTask(ownerID uint, projectID uint, taskID uint, input UpdateTaskInput) (*models.SenlinAgentTask, error) {
-	if err := ensureProjectOwner(ownerID, projectID); err != nil {
-		return nil, err
-	}
-	var task models.SenlinAgentTask
-	if err := models.DBService.Where("id = ? AND project_id = ?", taskID, projectID).First(&task).Error; err != nil {
-		return nil, err
-	}
-	nextProjectID := input.NextProjectID
-	if nextProjectID == 0 {
-		nextProjectID = task.ProjectID
-	}
-	if err := ensureProjectOwner(ownerID, nextProjectID); err != nil {
-		return nil, err
-	}
-	title := strings.TrimSpace(input.Title)
-	if title == "" {
-		return nil, errors.New("task title is required")
-	}
-	tagID, err := s.findOrCreateTagID(nextProjectID, input.Tag)
-	if err != nil {
-		return nil, err
-	}
-	projectIdentity, err := projectIdentity(nextProjectID)
-	if err != nil {
-		return nil, err
-	}
-	tagIdentity, err := optionalTagIdentity(tagID)
-	if err != nil {
-		return nil, err
-	}
-	status := strings.TrimSpace(input.Status)
-	if status == "" {
-		if input.Completed {
-			status = "done"
-		} else {
-			status = "open"
-		}
-	}
-	task.ProjectID = nextProjectID
-	task.ProjectIdentity = projectIdentity
-	task.Title = title
-	task.Description = strings.TrimSpace(input.Description)
-	task.Status = status
-	task.TagID = tagID
-	task.TagIdentity = tagIdentity
-	if err := models.DBService.Save(&task).Error; err != nil {
-		return nil, err
-	}
-	return &task, nil
-}
-
-func (s *Service) CreateFileSource(ownerID uint, projectID uint, input CreateFileSourceInput) (*models.SenlinAgentSource, error) {
-	if err := ensureProjectOwner(ownerID, projectID); err != nil {
-		return nil, err
-	}
-	title := strings.TrimSpace(input.Title)
-	if title == "" {
-		return nil, errors.New("source title is required")
-	}
-	filePath := strings.TrimSpace(input.FilePath)
-	if filePath == "" {
-		return nil, errors.New("source file path is required")
-	}
-	source := &models.SenlinAgentSource{ProjectID: projectID, CreatedBy: ownerID, Kind: "file", Title: title, FilePath: filePath}
-	return source, models.DBService.Create(source).Error
-}
-
 func (s *Service) CreateCronPlan(ownerID uint, projectID uint, input CreateCronPlanInput) (*models.SenlinAgentCronPlan, error) {
 	if err := ensureProjectOwner(ownerID, projectID); err != nil {
 		return nil, err
@@ -155,44 +64,13 @@ func (s *Service) ListTags(projectID uint) ([]models.SenlinAgentTag, error) {
 	return tags, err
 }

-func (s *Service) findOrCreateTagID(projectID uint, name string) (*uint, error) {
-	name = strings.TrimSpace(name)
-	if name == "" {
-		return nil, nil
-	}
-	tag, err := s.CreateTag(projectID, name)
-	if err != nil {
-		return nil, err
-	}
-	return &tag.ID, nil
-}
-
 func ensureProjectOwner(ownerID uint, projectID uint) error {
 	var count int64
 	if err := models.DBService.Model(&models.SenlinAgentProject{}).Where("id = ? AND owner_id = ?", projectID, ownerID).Count(&count).Error; err != nil {
 		return err
 	}
 	if count == 0 {
-		return errors.New("project not found")
+		return gorm.ErrRecordNotFound
 	}
 	return nil
 }
-
-func projectIdentity(projectID uint) (string, error) {
-	var project models.SenlinAgentProject
-	if err := models.DBService.Select("identity").First(&project, projectID).Error; err != nil {
-		return "", err
-	}
-	return project.Identity, nil
-}
-
-func optionalTagIdentity(tagID *uint) (*string, error) {
-	if tagID == nil {
-		return nil, nil
-	}
-	var tag models.SenlinAgentTag
-	if err := models.DBService.Select("identity").First(&tag, *tagID).Error; err != nil {
-		return nil, err
-	}
-	return &tag.Identity, nil
-}
--- a/backend/internal/logic/projects/service_test.go
+++ b/backend/internal/logic/projects/service_test.go
@@ -203,73 +203,6 @@ func TestWorkspaceRejectsProjectOwnedByAnotherUser(t *testing.T) {
 	require.Error(t, err)
 }

-func TestCreateTaskAddsTaskToOwnedProject(t *testing.T) {
-	database := newTestDB(t)
-	service := NewService()
-	require.NoError(t, database.Create(&models.SenlinAgentUser{Email: "david@example.com", DisplayName: "David", PasswordHash: "hash"}).Error)
-	project, err := service.CreateProject(1, "Alpha", "")
-	require.NoError(t, err)
-	dueAt := time.Date(2026, 7, 21, 9, 30, 0, 0, time.UTC)
-
-	task, err := service.CreateTask(1, project.ID, CreateTaskInput{
-		Title:       "Follow up with client",
-		Description: "整理客户反馈并形成行动项",
-		Status:      "",
-		DueAt:       &dueAt,
-		Tag:         "客户反馈",
-	})
-
-	require.NoError(t, err)
-	require.Equal(t, project.ID, task.ProjectID)
-	require.Equal(t, uint(1), task.CreatedBy)
-	require.Equal(t, "Follow up with client", task.Title)
-	require.Equal(t, "open", task.Status)
-	require.NotNil(t, task.DueAt)
-	require.NotNil(t, task.TagID)
-	workspace, err := service.Workspace(1, project.Identity)
-	require.NoError(t, err)
-	require.Len(t, workspace.Tasks, 1)
-	require.Equal(t, "Follow up with client", workspace.Tasks[0].Title)
-	require.Equal(t, "客户反馈", workspace.Tasks[0].Tag)
-	require.Equal(t, []string{"客户反馈"}, workspaceTagNames(workspace.Tags))
-}
-
-func TestCreateTaskRejectsProjectOwnedByAnotherUser(t *testing.T) {
-	newTestDB(t)
-	service := NewService()
-	project, err := service.CreateProject(2, "Beta", "")
-	require.NoError(t, err)
-
-	_, err = service.CreateTask(1, project.ID, CreateTaskInput{Title: "Nope"})
-
-	require.Error(t, err)
-}
-
-func TestUpdateTaskPersistsTagAndCompletion(t *testing.T) {
-	newTestDB(t)
-	service := NewService()
-	require.NoError(t, models.DBService.Create(&models.SenlinAgentUser{Email: "david@example.com", DisplayName: "David", PasswordHash: "hash"}).Error)
-	project, err := service.CreateProject(1, "Alpha", "")
-	require.NoError(t, err)
-	task, err := service.CreateTask(1, project.ID, CreateTaskInput{Title: "Draft proposal", Tag: "客户"})
-	require.NoError(t, err)
-
-	updated, err := service.UpdateTask(1, project.ID, task.ID, UpdateTaskInput{
-		Title:       "Draft proposal v2",
-		Description: "Updated scope",
-		Completed:   true,
-		Tag:         "重要",
-	})
-
-	require.NoError(t, err)
-	require.Equal(t, "Draft proposal v2", updated.Title)
-	require.Equal(t, "done", updated.Status)
-	workspace, err := service.Workspace(1, project.Identity)
-	require.NoError(t, err)
-	require.Equal(t, "重要", workspace.Tasks[0].Tag)
-	require.Equal(t, []string{"客户", "重要"}, workspaceTagNames(workspace.Tags))
-}
-
 func TestCreateProjectTagAddsTagToOwnedProject(t *testing.T) {
 	newTestDB(t)
 	service := NewService()
@@ -297,28 +230,6 @@ func TestCreateProjectTagRejectsProjectOwnedByAnotherUser(t *testing.T) {
 	require.Error(t, err)
 }

-func TestCreateFileSourceAddsSourceToOwnedProject(t *testing.T) {
-	database := newTestDB(t)
-	service := NewService()
-	project, err := service.CreateProject(1, "Alpha", "")
-	require.NoError(t, err)
-
-	source, err := service.CreateFileSource(1, project.ID, CreateFileSourceInput{
-		Title:    "客户访谈.pdf",
-		FilePath: "projects/1/客户访谈.pdf",
-	})
-
-	require.NoError(t, err)
-	require.Equal(t, project.ID, source.ProjectID)
-	require.Equal(t, uint(1), source.CreatedBy)
-	require.Equal(t, "file", source.Kind)
-	require.Equal(t, "客户访谈.pdf", source.Title)
-	require.Equal(t, "projects/1/客户访谈.pdf", source.FilePath)
-	var count int64
-	require.NoError(t, database.Model(&models.SenlinAgentSource{}).Where("project_id = ? AND kind = ?", project.ID, "file").Count(&count).Error)
-	require.Equal(t, int64(1), count)
-}
-
 func TestCreateCronPlanAddsPlanToOwnedProject(t *testing.T) {
 	database := newTestDB(t)
 	service := NewService()
--- a/backend/internal/logic/projects/tag_handlers.go
+++ b/backend/internal/logic/projects/tag_handlers.go
@@ -0,0 +1,82 @@
+package projects
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"senlinai-agent/backend/internal/httpx"
+	"senlinai-agent/backend/internal/logic/auth"
+	"senlinai-agent/backend/internal/models"
+)
+
+// TagHandler 单独承载项目内标签接口，避免项目核心 handler 混入对象写职责。
+type TagHandler struct {
+	service *Service
+}
+
+// NewTagHandler 创建项目标签 HTTP registrar。
+func NewTagHandler(service *Service) *TagHandler {
+	return &TagHandler{service: service}
+}
+
+// Register 注册项目范围内的标签读写接口。
+func (h *TagHandler) Register(router gin.IRouter) {
+	router.GET("/projects/:id/tags", h.list)
+	router.POST("/projects/:id/tags", h.create)
+}
+
+func (h *TagHandler) list(c *gin.Context) {
+	userID, project, ok := ownedProjectFromRequest(c)
+	if !ok {
+		return
+	}
+	tags, err := h.service.ListProjectTags(userID, project.ID)
+	if err != nil {
+		writeProjectError(c, err)
+		return
+	}
+	result := make([]WorkspaceTagDTO, 0, len(tags))
+	for _, tag := range tags {
+		result = append(result, WorkspaceTagDTO{ID: tag.Identity, Name: tag.Name})
+	}
+	c.JSON(http.StatusOK, result)
+}
+
+func (h *TagHandler) create(c *gin.Context) {
+	userID, project, ok := ownedProjectFromRequest(c)
+	if !ok {
+		return
+	}
+	var input struct {
+		Name string `json:"name"`
+	}
+	if err := c.ShouldBindJSON(&input); err != nil {
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "请求参数无效")
+		return
+	}
+	tag, err := h.service.CreateProjectTag(userID, project.ID, input.Name)
+	if err != nil {
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "标签名称不能为空")
+		return
+	}
+	c.JSON(http.StatusCreated, WorkspaceTagDTO{ID: tag.Identity, Name: tag.Name})
+}
+
+func ownedProjectFromRequest(c *gin.Context) (uint, *models.SenlinAgentProject, bool) {
+	userID, ok := auth.CurrentUserID(c)
+	if !ok {
+		httpx.Error(c, http.StatusUnauthorized, "unauthorized", "未登录或登录已失效")
+		return 0, nil, false
+	}
+	identity, ok := httpx.IdentityParam(c, "id")
+	if !ok {
+		return 0, nil, false
+	}
+	// 标签接口先以 owner_id + identity 锁定项目，避免形成全局标签或越权读写。
+	project, err := FindOwnedProject(userID, identity)
+	if err != nil {
+		writeProjectError(c, err)
+		return 0, nil, false
+	}
+	return userID, project, true
+}
--- a/backend/internal/logic/projects/write_handlers_test.go
+++ b/backend/internal/logic/projects/write_handlers_test.go
@@ -0,0 +1,98 @@
+package projects
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/require"
+	"senlinai-agent/backend/internal/config"
+	"senlinai-agent/backend/internal/httpx"
+	"senlinai-agent/backend/internal/models"
+)
+
+func TestTagRegistrarUsesIdentityAndListsOnlyProjectTags(t *testing.T) {
+	database := newTestDB(t)
+	require.NoError(t, database.Create(&models.SenlinAgentUser{Email: "owner@example.com", DisplayName: "Owner", PasswordHash: "hash"}).Error)
+	first := models.SenlinAgentProject{OwnerID: 1, Name: "Alpha", Identifier: "ALPHA"}
+	second := models.SenlinAgentProject{OwnerID: 1, Name: "Beta", Identifier: "BETA"}
+	require.NoError(t, database.Create(&first).Error)
+	require.NoError(t, database.Create(&second).Error)
+	require.NoError(t, database.Create(&models.SenlinAgentTag{ProjectID: second.ID, Name: "其他项目"}).Error)
+	router := newProjectWriteHandlerRouter(t, 1, NewTagHandler(NewService()))
+	createReq := httptest.NewRequest(http.MethodPost, "/api/v1/projects/"+first.Identity+"/tags", bytes.NewBufferString(`{"name":"设计"}`))
+	createReq.Header.Set("Content-Type", "application/json")
+	createReq.Header.Set("Authorization", "Bearer test-token")
+	createRec := httptest.NewRecorder()
+
+	router.ServeHTTP(createRec, createReq)
+
+	require.Equal(t, http.StatusCreated, createRec.Code, createRec.Body.String())
+	var created map[string]any
+	require.NoError(t, json.Unmarshal(createRec.Body.Bytes(), &created))
+	require.NotEmpty(t, created["id"])
+	require.Equal(t, "设计", created["name"])
+	require.ElementsMatch(t, []string{"id", "name"}, mapKeys(created))
+
+	listReq := httptest.NewRequest(http.MethodGet, "/api/v1/projects/"+first.Identity+"/tags", nil)
+	listReq.Header.Set("Authorization", "Bearer test-token")
+	listRec := httptest.NewRecorder()
+	router.ServeHTTP(listRec, listReq)
+	require.Equal(t, http.StatusOK, listRec.Code, listRec.Body.String())
+	var listed []WorkspaceTagDTO
+	require.NoError(t, json.Unmarshal(listRec.Body.Bytes(), &listed))
+	require.Len(t, listed, 1)
+	require.Equal(t, "设计", listed[0].Name)
+}
+
+func TestTagRegistrarRejectsProjectOwnedByAnotherUser(t *testing.T) {
+	database := newTestDB(t)
+	require.NoError(t, database.Create(&models.SenlinAgentUser{Email: "owner@example.com", DisplayName: "Owner", PasswordHash: "hash"}).Error)
+	other := models.SenlinAgentProject{OwnerID: 2, Name: "Private", Identifier: "PRIVATE"}
+	require.NoError(t, database.Create(&other).Error)
+	router := newProjectWriteHandlerRouter(t, 1, NewTagHandler(NewService()))
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/"+other.Identity+"/tags", bytes.NewBufferString(`{"name":"越权"}`))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer test-token")
+	rec := httptest.NewRecorder()
+
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusNotFound, rec.Code, rec.Body.String())
+}
+
+func TestCronRegistrarCreatesCamelCaseIdentityDTO(t *testing.T) {
+	database := newTestDB(t)
+	require.NoError(t, database.Create(&models.SenlinAgentUser{Email: "owner@example.com", DisplayName: "Owner", PasswordHash: "hash"}).Error)
+	project := models.SenlinAgentProject{OwnerID: 1, Name: "Alpha", Identifier: "ALPHA"}
+	require.NoError(t, database.Create(&project).Error)
+	router := newProjectWriteHandlerRouter(t, 1, NewCronHandler(NewService()))
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/"+project.Identity+"/cron-plans", bytes.NewBufferString(`{"title":"每日整理","schedule":"0 9 * * *","enabled":true,"nextRunAt":"2026-07-22T08:00:00Z"}`))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer test-token")
+	rec := httptest.NewRecorder()
+
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusCreated, rec.Code, rec.Body.String())
+	var plan models.SenlinAgentCronPlan
+	require.NoError(t, database.Where("project_id = ?", project.ID).First(&plan).Error)
+	var payload map[string]any
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &payload))
+	require.Equal(t, plan.Identity, payload["id"])
+	require.Equal(t, project.Identity, payload["projectId"])
+	require.Equal(t, "2026-07-22T08:00:00Z", payload["nextRunAt"])
+	require.NotContains(t, payload, "ProjectID")
+}
+
+func newProjectWriteHandlerRouter(t *testing.T, currentUserID uint, registrar httpx.RouteRegistrar) *gin.Engine {
+	t.Helper()
+	return httpx.NewProtectedRouter(
+		config.Config{Env: "test"},
+		func(string) (uint, error) { return currentUserID, nil },
+		registrar,
+	)
+}
--- a/backend/internal/logic/tasks/dto.go
+++ b/backend/internal/logic/tasks/dto.go
@@ -0,0 +1,39 @@
+package tasks
+
+import "time"
+
+// TaskDTO 是任务写接口的稳定响应，所有关联 ID 都使用公开 identity。
+type TaskDTO struct {
+	ID                string     `json:"id"`
+	ProjectID         string     `json:"projectId"`
+	Title             string     `json:"title"`
+	Description       string     `json:"description"`
+	Status            string     `json:"status"`
+	Completed         bool       `json:"completed"`
+	DueAt             *time.Time `json:"dueAt"`
+	AssigneeID        *string    `json:"assigneeId"`
+	TagID             *string    `json:"tagId"`
+	Tag               string     `json:"tag"`
+	SourceInboxItemID *string    `json:"sourceInboxItemId"`
+	CreatedAt         time.Time  `json:"createdAt"`
+	UpdatedAt         time.Time  `json:"updatedAt"`
+}
+
+// CreateTaskInput 描述创建任务时允许写入的项目内字段。
+type CreateTaskInput struct {
+	Title       string
+	Description string
+	Status      string
+	DueAt       *time.Time
+	Tag         string
+}
+
+// UpdateTaskInput 使用目标项目 identity 表达移动，避免 API 接触内部自增 ID。
+type UpdateTaskInput struct {
+	Title               string
+	Description         string
+	Status              string
+	Completed           bool
+	NextProjectIdentity string
+	Tag                 string
+}
--- a/backend/internal/logic/tasks/handlers.go
+++ b/backend/internal/logic/tasks/handlers.go
@@ -0,0 +1,153 @@
+package tasks
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+	"senlinai-agent/backend/internal/httpx"
+	"senlinai-agent/backend/internal/logic/auth"
+)
+
+// Handler 只注册任务写接口，项目核心 handler 不再承担任务职责。
+type Handler struct {
+	service *Service
+}
+
+// NewHandler 创建任务 HTTP registrar。
+func NewHandler(service *Service) *Handler {
+	return &Handler{service: service}
+}
+
+// Register 将任务写接口注册到上层提供的 /api/v1 路由组。
+func (h *Handler) Register(router gin.IRouter) {
+	router.POST("/projects/:id/tasks", h.create)
+	router.PATCH("/projects/:id/tasks/:taskId", h.update)
+}
+
+type createTaskRequest struct {
+	Title       string `json:"title"`
+	Description string `json:"description"`
+	Status      string `json:"status"`
+	DueAt       string `json:"dueAt"`
+	Tag         string `json:"tag"`
+}
+
+type updateTaskRequest struct {
+	Title         string `json:"title"`
+	Description   string `json:"description"`
+	Status        string `json:"status"`
+	Completed     bool   `json:"completed"`
+	NextProjectID string `json:"nextProjectId"`
+	Tag           string `json:"tag"`
+}
+
+func (h *Handler) create(c *gin.Context) {
+	userID, ok := currentUser(c)
+	if !ok {
+		return
+	}
+	projectIdentity, ok := httpx.IdentityParam(c, "id")
+	if !ok {
+		return
+	}
+	var input createTaskRequest
+	if err := c.ShouldBindJSON(&input); err != nil {
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "请求参数无效")
+		return
+	}
+	dueAt, err := parseOptionalTime(input.DueAt)
+	if err != nil {
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "截止时间格式无效")
+		return
+	}
+	task, err := h.service.Create(userID, projectIdentity, CreateTaskInput{
+		Title: input.Title, Description: input.Description, Status: input.Status, DueAt: dueAt, Tag: input.Tag,
+	})
+	if err != nil {
+		writeTaskError(c, err)
+		return
+	}
+	c.JSON(http.StatusCreated, task)
+}
+
+func (h *Handler) update(c *gin.Context) {
+	userID, ok := currentUser(c)
+	if !ok {
+		return
+	}
+	projectIdentity, ok := httpx.IdentityParam(c, "id")
+	if !ok {
+		return
+	}
+	taskIdentity, ok := httpx.IdentityParam(c, "taskId")
+	if !ok {
+		return
+	}
+	var input updateTaskRequest
+	if err := c.ShouldBindJSON(&input); err != nil {
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "请求参数无效")
+		return
+	}
+	if strings.TrimSpace(input.NextProjectID) != "" {
+		if _, ok := parseIdentity(input.NextProjectID); !ok {
+			httpx.Error(c, http.StatusBadRequest, "invalid_identity", "nextProjectId 必须是 UUIDv7")
+			return
+		}
+	}
+	task, err := h.service.Update(userID, projectIdentity, taskIdentity, UpdateTaskInput{
+		Title: input.Title, Description: input.Description, Status: input.Status, Completed: input.Completed,
+		NextProjectIdentity: input.NextProjectID, Tag: input.Tag,
+	})
+	if err != nil {
+		writeTaskError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, task)
+}
+
+func currentUser(c *gin.Context) (uint, bool) {
+	userID, ok := auth.CurrentUserID(c)
+	if !ok {
+		httpx.Error(c, http.StatusUnauthorized, "unauthorized", "未登录或登录已失效")
+		return 0, false
+	}
+	return userID, true
+}
+
+func parseOptionalTime(value string) (*time.Time, error) {
+	trimmed := strings.TrimSpace(value)
+	if trimmed == "" {
+		return nil, nil
+	}
+	parsed, err := time.Parse(time.RFC3339, trimmed)
+	if err != nil {
+		return nil, err
+	}
+	parsed = parsed.UTC()
+	return &parsed, nil
+}
+
+func parseIdentity(value string) (string, bool) {
+	trimmed := strings.TrimSpace(value)
+	identity, err := uuid.Parse(trimmed)
+	if err != nil || identity.Version() != 7 || identity.Variant() != uuid.RFC4122 {
+		return "", false
+	}
+	return identity.String(), true
+}
+
+func writeTaskError(c *gin.Context, err error) {
+	switch {
+	case errors.Is(err, gorm.ErrRecordNotFound):
+		httpx.Error(c, http.StatusNotFound, "not_found", "任务或项目不存在")
+	case errors.Is(err, ErrTaskTitleRequired):
+		httpx.Error(c, http.StatusBadRequest, "invalid_request", "任务标题不能为空")
+	default:
+		httpx.Error(c, http.StatusInternalServerError, "internal_error", "任务操作失败")
+	}
+}
--- a/backend/internal/logic/tasks/handlers_test.go
+++ b/backend/internal/logic/tasks/handlers_test.go
@@ -0,0 +1,109 @@
+package tasks
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/glebarez/sqlite"
+	"github.com/stretchr/testify/require"
+	"gorm.io/gorm"
+	"senlinai-agent/backend/internal/config"
+	"senlinai-agent/backend/internal/httpx"
+	"senlinai-agent/backend/internal/models"
+)
+
+func TestTaskRegistrarCreatesIdentityDTOForOwnedProject(t *testing.T) {
+	router, database, project := newTaskHandlerTestRouter(t, 1)
+	body := bytes.NewBufferString(`{"title":"整理访谈","description":"提取行动项","dueAt":"2026-07-22T08:00:00Z","tag":"客户"}`)
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/"+project.Identity+"/tasks", body)
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer test-token")
+	rec := httptest.NewRecorder()
+
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusCreated, rec.Code, rec.Body.String())
+	var task models.SenlinAgentTask
+	require.NoError(t, database.Where("project_id = ?", project.ID).First(&task).Error)
+	var payload map[string]any
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &payload))
+	require.Equal(t, task.Identity, payload["id"])
+	require.Equal(t, project.Identity, payload["projectId"])
+	require.Equal(t, "客户", payload["tag"])
+	require.NotEmpty(t, payload["tagId"])
+	require.NotEmpty(t, payload["createdAt"])
+	require.NotContains(t, payload, "ID")
+	require.NotContains(t, payload, "ProjectID")
+}
+
+func TestTaskRegistrarMovesTaskByIdentityAndClearsForeignProjectTag(t *testing.T) {
+	router, database, first := newTaskHandlerTestRouter(t, 1)
+	second := models.SenlinAgentProject{OwnerID: 1, Name: "Beta", Identifier: "BETA"}
+	require.NoError(t, database.Create(&second).Error)
+	tag := models.SenlinAgentTag{ProjectID: first.ID, Name: "仅 Alpha"}
+	require.NoError(t, database.Create(&tag).Error)
+	task := models.SenlinAgentTask{ProjectID: first.ID, CreatedBy: 1, TagID: &tag.ID, Title: "迁移任务", Status: "open"}
+	require.NoError(t, database.Create(&task).Error)
+	note := models.SenlinAgentNote{ProjectID: first.ID, CreatedBy: 1, Title: "旧项目资料", Markdown: "仅可在 Alpha 分享"}
+	require.NoError(t, database.Create(&note).Error)
+	require.NoError(t, NewService(database).ShareObject(task.ID, "note", note.ID))
+	body := bytes.NewBufferString(fmt.Sprintf(`{"title":"迁移任务","description":"已移动","completed":false,"nextProjectId":%q}`, second.Identity))
+	req := httptest.NewRequest(http.MethodPatch, "/api/v1/projects/"+first.Identity+"/tasks/"+task.Identity, body)
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer test-token")
+	rec := httptest.NewRecorder()
+
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusOK, rec.Code, rec.Body.String())
+	require.NoError(t, database.First(&task, task.ID).Error)
+	require.Equal(t, second.ID, task.ProjectID)
+	require.Nil(t, task.TagID)
+	var shareCount int64
+	require.NoError(t, database.Model(&models.SenlinAgentTaskShare{}).Where("task_id = ?", task.ID).Count(&shareCount).Error)
+	require.Zero(t, shareCount, "移动项目后不能保留旧项目的显式分享")
+	var payload map[string]any
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &payload))
+	require.Equal(t, second.Identity, payload["projectId"])
+	require.Nil(t, payload["tagId"])
+}
+
+func TestTaskRegistrarRejectsProjectOwnedByAnotherUser(t *testing.T) {
+	router, database, _ := newTaskHandlerTestRouter(t, 1)
+	other := models.SenlinAgentProject{OwnerID: 2, Name: "Private", Identifier: "PRIVATE"}
+	require.NoError(t, database.Create(&other).Error)
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/"+other.Identity+"/tasks", bytes.NewBufferString(`{"title":"越权"}`))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer test-token")
+	rec := httptest.NewRecorder()
+
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusNotFound, rec.Code, rec.Body.String())
+	var count int64
+	require.NoError(t, database.Model(&models.SenlinAgentTask{}).Where("project_id = ?", other.ID).Count(&count).Error)
+	require.Zero(t, count)
+}
+
+func newTaskHandlerTestRouter(t *testing.T, currentUserID uint) (*gin.Engine, *gorm.DB, models.SenlinAgentProject) {
+	t.Helper()
+	database, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())), &gorm.Config{TranslateError: true})
+	require.NoError(t, err)
+	require.NoError(t, models.AutoMigrate(database))
+	models.DBService = database
+	require.NoError(t, database.Create(&models.SenlinAgentUser{Email: "owner@example.com", DisplayName: "Owner", PasswordHash: "hash"}).Error)
+	require.NoError(t, database.Create(&models.SenlinAgentUser{Email: "other@example.com", DisplayName: "Other", PasswordHash: "hash"}).Error)
+	project := models.SenlinAgentProject{OwnerID: 1, Name: "Alpha", Identifier: "ALPHA"}
+	require.NoError(t, database.Create(&project).Error)
+	router := httpx.NewProtectedRouter(
+		config.Config{Env: "test"},
+		func(string) (uint, error) { return currentUserID, nil },
+		NewHandler(NewService(database)),
+	)
+	return router, database, project
+}
--- a/backend/internal/logic/tasks/service.go
+++ b/backend/internal/logic/tasks/service.go
@@ -3,12 +3,15 @@ package tasks
 import (
 	"errors"
 	"fmt"
+	"strings"
+	"time"

 	"gorm.io/gorm"
 	"senlinai-agent/backend/internal/models"
 )

 type Service struct {
+	db *gorm.DB
 }

 type LinkedObject struct {
@@ -16,12 +19,24 @@ type LinkedObject struct {
 	ObjectID   uint   `json:"object_id"`
 }

-func NewService() *Service {
-	return &Service{}
+// NewService 接受数据库或上层事务，确保任务写入、标签调整和分享检查使用同一依赖。
+func NewService(databases ...*gorm.DB) *Service {
+	var database *gorm.DB
+	if len(databases) > 0 {
+		database = databases[0]
+	}
+	return &Service{db: database}
+}
+
+func (s *Service) database() *gorm.DB {
+	if s.db != nil {
+		return s.db
+	}
+	return models.DBService
 }

 func (s *Service) Assign(taskID uint, assigneeID uint) error {
-	return models.DBService.Transaction(func(tx *gorm.DB) error {
+	return s.database().Transaction(func(tx *gorm.DB) error {
 		var task models.SenlinAgentTask
 		if err := tx.First(&task, taskID).Error; err != nil {
 			return err
@@ -40,11 +55,12 @@ func (s *Service) Assign(taskID uint, assigneeID uint) error {
 	})
 }

+// ShareObject 只允许显式分享 note/source，并在同一事务中验证关联对象属于任务所在项目。
 func (s *Service) ShareObject(taskID uint, objectType string, objectID uint) error {
 	if objectType != "note" && objectType != "source" {
 		return errors.New("unsupported shared object type")
 	}
-	return models.DBService.Transaction(func(tx *gorm.DB) error {
+	return s.database().Transaction(func(tx *gorm.DB) error {
 		var task models.SenlinAgentTask
 		if err := tx.First(&task, taskID).Error; err != nil {
 			return err
@@ -66,16 +82,17 @@ func (s *Service) ShareObject(taskID uint, objectType string, objectID uint) err
 	})
 }

+// VisibleLinkedObjects 对被指派人也只返回显式分享记录，不因任务可见而扩大关联对象权限。
 func (s *Service) VisibleLinkedObjects(taskID uint, viewerID uint) ([]LinkedObject, error) {
 	var task models.SenlinAgentTask
-	if err := models.DBService.First(&task, taskID).Error; err != nil {
+	if err := s.database().First(&task, taskID).Error; err != nil {
 		return nil, err
 	}
 	if task.AssigneeID == nil || *task.AssigneeID != viewerID {
 		return []LinkedObject{}, nil
 	}
 	var shares []models.SenlinAgentTaskShare
-	if err := models.DBService.Where("task_id = ?", taskID).Find(&shares).Error; err != nil {
+	if err := s.database().Where("task_id = ?", taskID).Find(&shares).Error; err != nil {
 		return nil, err
 	}
 	objects := make([]LinkedObject, 0, len(shares))
@@ -85,6 +102,143 @@ func (s *Service) VisibleLinkedObjects(taskID uint, viewerID uint) ([]LinkedObje
 	return objects, nil
 }

+var ErrTaskTitleRequired = errors.New("task title is required")
+
+// Create 在同一事务中校验项目所有权、解析项目内标签并创建任务。
+func (s *Service) Create(ownerID uint, projectIdentity string, input CreateTaskInput) (TaskDTO, error) {
+	var result TaskDTO
+	err := s.database().Transaction(func(tx *gorm.DB) error {
+		project, err := findOwnedProject(tx, ownerID, projectIdentity)
+		if err != nil {
+			return err
+		}
+		title := strings.TrimSpace(input.Title)
+		if title == "" {
+			return ErrTaskTitleRequired
+		}
+		status := strings.TrimSpace(input.Status)
+		if status == "" {
+			status = "open"
+		}
+		tagID, tagIdentity, tagName, err := findOrCreateProjectTag(tx, project.ID, input.Tag)
+		if err != nil {
+			return err
+		}
+		task := models.SenlinAgentTask{
+			ProjectID: project.ID, CreatedBy: ownerID, TagID: tagID,
+			Title: title, Description: strings.TrimSpace(input.Description), Status: status, DueAt: utcOptionalTime(input.DueAt),
+		}
+		if err := tx.Create(&task).Error; err != nil {
+			return err
+		}
+		result = makeTaskDTO(task, project.Identity, tagIdentity, tagName)
+		return nil
+	})
+	return result, err
+}
+
+// Update 同时按项目和任务 identity 查询；移动项目时重新校验所有权，并重新解析目标项目标签。
+func (s *Service) Update(ownerID uint, projectIdentity, taskIdentity string, input UpdateTaskInput) (TaskDTO, error) {
+	var result TaskDTO
+	err := s.database().Transaction(func(tx *gorm.DB) error {
+		currentProject, err := findOwnedProject(tx, ownerID, projectIdentity)
+		if err != nil {
+			return err
+		}
+		var task models.SenlinAgentTask
+		if err := tx.Where("identity = ? AND project_id = ?", taskIdentity, currentProject.ID).First(&task).Error; err != nil {
+			return err
+		}
+		targetProject := currentProject
+		if strings.TrimSpace(input.NextProjectIdentity) != "" && input.NextProjectIdentity != currentProject.Identity {
+			targetProject, err = findOwnedProject(tx, ownerID, input.NextProjectIdentity)
+			if err != nil {
+				return err
+			}
+		}
+		title := strings.TrimSpace(input.Title)
+		if title == "" {
+			return ErrTaskTitleRequired
+		}
+		status := strings.TrimSpace(input.Status)
+		if status == "" {
+			if input.Completed {
+				status = "done"
+			} else {
+				status = "open"
+			}
+		}
+
+		// 标签只能在目标项目内重新解析；未提供标签时会清空旧项目标签，不能跨项目沿用。
+		tagID, tagIdentity, tagName, err := findOrCreateProjectTag(tx, targetProject.ID, input.Tag)
+		if err != nil {
+			return err
+		}
+		task.ProjectID = targetProject.ID
+		task.ProjectIdentity = targetProject.Identity
+		task.Title = title
+		task.Description = strings.TrimSpace(input.Description)
+		task.Status = status
+		task.TagID = tagID
+		task.TagIdentity = tagIdentity
+		if targetProject.ID != currentProject.ID {
+			// 现有分享都在原项目边界内；移动后必须清空，避免旧项目 note/source 继续对被指派人可见。
+			if err := tx.Where("task_id = ?", task.ID).Delete(&models.SenlinAgentTaskShare{}).Error; err != nil {
+				return err
+			}
+		}
+		if err := tx.Save(&task).Error; err != nil {
+			return err
+		}
+		result = makeTaskDTO(task, targetProject.Identity, tagIdentity, tagName)
+		return nil
+	})
+	return result, err
+}
+
+func findOwnedProject(tx *gorm.DB, ownerID uint, identity string) (*models.SenlinAgentProject, error) {
+	var project models.SenlinAgentProject
+	if err := tx.Where("owner_id = ? AND identity = ?", ownerID, identity).First(&project).Error; err != nil {
+		return nil, err
+	}
+	return &project, nil
+}
+
+func findOrCreateProjectTag(tx *gorm.DB, projectID uint, value string) (*uint, *string, string, error) {
+	name := strings.TrimSpace(value)
+	if name == "" {
+		return nil, nil, "", nil
+	}
+	var tag models.SenlinAgentTag
+	err := tx.Where("project_id = ? AND name = ?", projectID, name).First(&tag).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		tag = models.SenlinAgentTag{ProjectID: projectID, Name: name}
+		if err := tx.Create(&tag).Error; err != nil {
+			return nil, nil, "", err
+		}
+	} else if err != nil {
+		return nil, nil, "", err
+	}
+	return &tag.ID, &tag.Identity, tag.Name, nil
+}
+
+func makeTaskDTO(task models.SenlinAgentTask, projectIdentity string, tagIdentity *string, tagName string) TaskDTO {
+	return TaskDTO{
+		ID: task.Identity, ProjectID: projectIdentity, Title: task.Title, Description: task.Description,
+		Status: task.Status, Completed: task.Status == "done", DueAt: utcOptionalTime(task.DueAt),
+		AssigneeID: task.AssigneeIdentity, TagID: tagIdentity, Tag: tagName,
+		SourceInboxItemID: task.SourceInboxItemIdentity, CreatedAt: task.CreatedAt.UTC(), UpdatedAt: task.UpdatedAt.UTC(),
+	}
+}
+
+func utcOptionalTime(value *time.Time) *time.Time {
+	if value == nil {
+		return nil
+	}
+	result := value.UTC()
+	return &result
+}
+
 func ensureSharedObjectInProject(tx *gorm.DB, projectID uint, objectType string, objectID uint) error {
 	switch objectType {
 	case "note":