diff --git a/backend/internal/logic/dataset/service.go b/backend/internal/logic/dataset/service.go
index 65ab8c7..ee85b32 100644
--- a/backend/internal/logic/dataset/service.go
+++ b/backend/internal/logic/dataset/service.go
@@ -366,7 +366,7 @@ func (s *Service) DepositItem(userID uint, itemIdentity, projectIdentity string)
 	var document models.SaDocumentTree
 	err = s.db.Transaction(func(tx *gorm.DB) error {
 		document = models.SaDocumentTree{
-			ProjectID: project.ID, CreatedBy: userID, Kind: models.DocumentKindFile,
+			ProjectID: project.ID, OwnerID: userID, Kind: models.DocumentKindFile,
 			Name: name, NormalizedName: strings.ToLower(name), Extension: ".md",
 			MimeType: "text/markdown; charset=utf-8", Size: int64(len([]byte(body))),
 			Revision: 1, ScanStatus: "not_scanned",
diff --git a/backend/internal/logic/documents/service.go b/backend/internal/logic/documents/service.go
index 0a6e67d..d5ac7d6 100644
--- a/backend/internal/logic/documents/service.go
+++ b/backend/internal/logic/documents/service.go
@@ -153,7 +153,7 @@ func (s *Service) createNode(userID uint, projectIdentity string, input CreateIn
 		ProjectID: project.ID, ProjectIdentity: project.Identity,
 		ParentID: parentID, ParentIdentity: parentIdentity,
 		ParentScope: identityValue(parentIdentity),
-		CreatedBy:   userID, SourceInboxItemID: input.SourceInboxItemID,
+		OwnerID:     userID, SourceInboxItemID: input.SourceInboxItemID,
 		Kind: kind, Name: name, NormalizedName: normalizeName(name),
 		Extension: extension, MimeType: mimeType, Size: size, Revision: 1,
 		ScanStatus: "not_scanned",
diff --git a/backend/internal/logic/inbox/service.go b/backend/internal/logic/inbox/service.go
index a8540ab..4c7756b 100644
--- a/backend/internal/logic/inbox/service.go
+++ b/backend/internal/logic/inbox/service.go
@@ -280,7 +280,7 @@ func createConfirmedObject(tx *gorm.DB, item models.SaInboxItem, suggestion mode
 			name += ".md"
 		}
 		document := models.SaDocumentTree{
-			ProjectID: item.ProjectID, ProjectIdentity: item.ProjectIdentity, CreatedBy: item.CreatedBy,
+			ProjectID: item.ProjectID, ProjectIdentity: item.ProjectIdentity, OwnerID: item.CreatedBy,
 			SourceInboxItemID: &sourceInboxItemID, Kind: models.DocumentKindFile, Name: name,
 			NormalizedName: strings.ToLower(name), Extension: ".md", MimeType: "text/markdown; charset=utf-8",
 			Size: int64(len([]byte(suggestion.Body))), Revision: 1, ScanStatus: "not_scanned",
diff --git a/backend/internal/logic/inbox/service_test.go b/backend/internal/logic/inbox/service_test.go
index 4e08e69..161f802 100644
--- a/backend/internal/logic/inbox/service_test.go
+++ b/backend/internal/logic/inbox/service_test.go
@@ -162,7 +162,8 @@ func TestConfirmCreatesOnlySelectedSavedSuggestionsWithInboxIdentity(t *testing.
 	require.Equal(t, "背景资料.md", documents[1].Name)
 	for _, document := range documents {
 		require.Equal(t, fixture.project.ID, document.ProjectID)
-		require.Equal(t, fixture.owner.ID, document.CreatedBy)
+		require.Equal(t, fixture.owner.ID, document.OwnerID)
+		require.Equal(t, fixture.owner.Identity, document.OwnerIdentity)
 		requireSourceInboxIdentity(t, item, document.SourceInboxItemID, document.SourceInboxItemIdentity)
 	}
 	var secondContent models.SaDocumentContent
@@ -267,7 +268,7 @@ func TestRepeatedConfirmReturnsPersistedResultAfterRelatedObjectsChange(t *testi
 
 	sourceInboxItemID := item.ID
 	extraDocument := models.SaDocumentTree{
-		ProjectID: item.ProjectID, CreatedBy: fixture.owner.ID, SourceInboxItemID: &sourceInboxItemID,
+		ProjectID: item.ProjectID, OwnerID: fixture.owner.ID, SourceInboxItemID: &sourceInboxItemID,
 		Kind: models.DocumentKindFile, Name: "后续关联资料.md", NormalizedName: "后续关联资料.md",
 		Extension: ".md", Revision: 1,
 	}
diff --git a/backend/internal/logic/projects/service_test.go b/backend/internal/logic/projects/service_test.go
index 2b55a43..999ebf3 100644
--- a/backend/internal/logic/projects/service_test.go
+++ b/backend/internal/logic/projects/service_test.go
@@ -127,8 +127,8 @@ func TestWorkspaceMatchesFrontendContract(t *testing.T) {
 	require.NoError(t, database.Create(&models.SaTask{ProjectID: project.ID, CreatedBy: 1, Title: "Confirm IA", Description: "Review channel layout.", Status: "open", DueAt: &nextRun}).Error)
 	require.NoError(t, database.Create(&models.SaTask{ProjectID: project.ID, CreatedBy: 1, Title: "Archive notes", Description: "Move outdated notes.", Status: "done"}).Error)
 	require.NoError(t, database.Create(&models.SaAISession{ProjectID: project.ID, CreatedBy: 1, Title: "UI prototype critique", Context: "Discuss channel behavior."}).Error)
-	require.NoError(t, database.Create(&models.SaDocumentTree{ProjectID: project.ID, CreatedBy: 1, Kind: models.DocumentKindFile, Name: "Workbench principles.md", NormalizedName: "workbench principles.md", Extension: ".md", Revision: 1}).Error)
-	require.NoError(t, database.Create(&models.SaDocumentTree{ProjectID: project.ID, CreatedBy: 1, Kind: models.DocumentKindFile, Name: "Reference board.pdf", NormalizedName: "reference board.pdf", Extension: ".pdf", Revision: 1}).Error)
+	require.NoError(t, database.Create(&models.SaDocumentTree{ProjectID: project.ID, OwnerID: 1, Kind: models.DocumentKindFile, Name: "Workbench principles.md", NormalizedName: "workbench principles.md", Extension: ".md", Revision: 1}).Error)
+	require.NoError(t, database.Create(&models.SaDocumentTree{ProjectID: project.ID, OwnerID: 1, Kind: models.DocumentKindFile, Name: "Reference board.pdf", NormalizedName: "reference board.pdf", Extension: ".pdf", Revision: 1}).Error)
 	require.NoError(t, database.Create(&models.SaProjectChannel{ProjectID: project.ID, Title: "Roadmap Board", Icon: "link", URL: "https://example.com/roadmap-a1", SortOrder: 7}).Error)
 	require.NoError(t, database.Create(&models.SaProjectChannel{ProjectID: other.ID, Title: "Other Board", Icon: "link", URL: "https://example.com/other", SortOrder: 7}).Error)
 	require.NoError(t, database.Create(&models.SaCronPlan{ProjectID: project.ID, CreatedBy: 1, Title: "Weekly inbox review reminder", Schedule: "0 9 * * 1", NextRunAt: &nextRun, Enabled: true, LastResult: "Not run yet"}).Error)
diff --git a/backend/internal/logic/projects/workspace_test.go b/backend/internal/logic/projects/workspace_test.go
index 227ce8f..5a6b977 100644
--- a/backend/internal/logic/projects/workspace_test.go
+++ b/backend/internal/logic/projects/workspace_test.go
@@ -33,8 +33,8 @@ func TestWorkspaceUsesIdentitiesUTCTimesAndProjectScopedTags(t *testing.T) {
 	inbox := models.SaInboxItem{ProjectID: project.ID, CreatedBy: 1, SourceType: "Manual", Title: "Collect notes", Body: "Turn research into tasks.", Status: "open", CreatedAt: createdAt, UpdatedAt: updatedAt}
 	task := models.SaTask{ProjectID: project.ID, CreatedBy: 1, TagID: &projectTag.ID, Title: "Confirm IA", Description: "Review channel layout.", Status: "done", DueAt: &nextRun, CreatedAt: createdAt, UpdatedAt: updatedAt}
 	session := models.SaAISession{ProjectID: project.ID, CreatedBy: 1, Title: "UI critique", Context: "Discuss channel behavior.", CreatedAt: createdAt, UpdatedAt: updatedAt}
-	firstDocument := models.SaDocumentTree{ProjectID: project.ID, CreatedBy: 1, Kind: models.DocumentKindFile, Name: "Workbench principles.md", NormalizedName: "workbench principles.md", Extension: ".md", MimeType: "text/markdown", Revision: 1, CreatedAt: createdAt, UpdatedAt: updatedAt}
-	secondDocument := models.SaDocumentTree{ProjectID: project.ID, CreatedBy: 1, Kind: models.DocumentKindFile, Name: "Reference board.pdf", NormalizedName: "reference board.pdf", Extension: ".pdf", MimeType: "application/pdf", Revision: 1, CreatedAt: createdAt, UpdatedAt: updatedAt}
+	firstDocument := models.SaDocumentTree{ProjectID: project.ID, OwnerID: 1, Kind: models.DocumentKindFile, Name: "Workbench principles.md", NormalizedName: "workbench principles.md", Extension: ".md", MimeType: "text/markdown", Revision: 1, CreatedAt: createdAt, UpdatedAt: updatedAt}
+	secondDocument := models.SaDocumentTree{ProjectID: project.ID, OwnerID: 1, Kind: models.DocumentKindFile, Name: "Reference board.pdf", NormalizedName: "reference board.pdf", Extension: ".pdf", MimeType: "application/pdf", Revision: 1, CreatedAt: createdAt, UpdatedAt: updatedAt}
 	channel := models.SaProjectChannel{ProjectID: project.ID, Title: "Roadmap Board", Icon: "link", URL: "https://example.com/roadmap", SortOrder: 7, CreatedAt: createdAt, UpdatedAt: updatedAt}
 	plan := models.SaCronPlan{ProjectID: project.ID, CreatedBy: 1, Title: "Weekly review", Schedule: "0 9 * * 1", NextRunAt: &nextRun, Enabled: true, CreatedAt: createdAt, UpdatedAt: updatedAt}
 	for _, record := range []any{&inbox, &task, &session, &firstDocument, &secondDocument, &channel, &plan} {
diff --git a/backend/internal/logic/search/service_postgres_test.go b/backend/internal/logic/search/service_postgres_test.go
index b76c5ae..26576e5 100644
--- a/backend/internal/logic/search/service_postgres_test.go
+++ b/backend/internal/logic/search/service_postgres_test.go
@@ -116,7 +116,7 @@ func createPostgresSearchDocument(
 	t.Helper()
 	document.ProjectID = project.ID
 	document.ProjectIdentity = project.Identity
-	document.CreatedBy = ownerID
+	document.OwnerID = ownerID
 	document.Kind = models.DocumentKindFile
 	document.Extension = ".md"
 	document.MimeType = "text/markdown; charset=utf-8"
diff --git a/backend/internal/logic/search/service_test.go b/backend/internal/logic/search/service_test.go
index fc88ce4..8822df5 100644
--- a/backend/internal/logic/search/service_test.go
+++ b/backend/internal/logic/search/service_test.go
@@ -55,7 +55,7 @@ func TestSearchAppliesStableFairGlobalLimitAcrossResultTypes(t *testing.T) {
 		document := models.SaDocumentTree{
 			Identity:       fmt.Sprintf("00000000-0000-7003-8000-%012d", index),
 			ProjectID:      project.ID,
-			CreatedBy:      7,
+			OwnerID:        7,
 			Kind:           models.DocumentKindFile,
 			Name:           fmt.Sprintf("稳定排序文档 %02d.md", index),
 			NormalizedName: fmt.Sprintf("稳定排序文档 %02d.md", index),
@@ -139,7 +139,7 @@ func TestSearchOnlyReturnsNavigableProjectTaskAndDocumentResults(t *testing.T) {
 func createSearchDocument(t *testing.T, database *gorm.DB, projectID, userID uint, name, markdown, identity string, updatedAt time.Time) models.SaDocumentTree {
 	t.Helper()
 	document := models.SaDocumentTree{
-		Identity: identity, ProjectID: projectID, CreatedBy: userID, Kind: models.DocumentKindFile,
+		Identity: identity, ProjectID: projectID, OwnerID: userID, Kind: models.DocumentKindFile,
 		Name: name, NormalizedName: strings.ToLower(name), Extension: ".md",
 		MimeType: "text/markdown", Size: int64(len([]byte(markdown))), Revision: 1,
 		UpdatedAt: updatedAt,
diff --git a/backend/internal/logic/tasks/concurrency_postgres_test.go b/backend/internal/logic/tasks/concurrency_postgres_test.go
index 24f99dc..328aa78 100644
--- a/backend/internal/logic/tasks/concurrency_postgres_test.go
+++ b/backend/internal/logic/tasks/concurrency_postgres_test.go
@@ -29,7 +29,7 @@ func TestPostgresMovePreventsOldProjectShareFromBeingInsertedConcurrently(t *tes
 	require.NoError(t, database.Create(&first).Error)
 	require.NoError(t, database.Create(&second).Error)
 	task := models.SaTask{ProjectID: first.ID, CreatedBy: owner.ID, Title: "Move", Status: "open"}
-	document := models.SaDocumentTree{ProjectID: first.ID, CreatedBy: owner.ID, Kind: models.DocumentKindFile, Name: "Old context.md", NormalizedName: "old context.md", Extension: ".md", Revision: 1}
+	document := models.SaDocumentTree{ProjectID: first.ID, OwnerID: owner.ID, Kind: models.DocumentKindFile, Name: "Old context.md", NormalizedName: "old context.md", Extension: ".md", Revision: 1}
 	require.NoError(t, database.Create(&task).Error)
 	require.NoError(t, database.Create(&document).Error)
 	t.Cleanup(func() {
diff --git a/backend/internal/logic/tasks/handlers_test.go b/backend/internal/logic/tasks/handlers_test.go
index cb41180..5a4ba43 100644
--- a/backend/internal/logic/tasks/handlers_test.go
+++ b/backend/internal/logic/tasks/handlers_test.go
@@ -50,7 +50,7 @@ func TestTaskRegistrarMovesTaskByIdentityAndClearsForeignProjectTag(t *testing.T
 	require.NoError(t, database.Create(&tag).Error)
 	task := models.SaTask{ProjectID: first.ID, CreatedBy: 1, TagID: &tag.ID, Title: "迁移任务", Status: "open"}
 	require.NoError(t, database.Create(&task).Error)
-	document := models.SaDocumentTree{ProjectID: first.ID, CreatedBy: 1, Kind: models.DocumentKindFile, Name: "旧项目资料.md", NormalizedName: "旧项目资料.md", Extension: ".md", Revision: 1}
+	document := models.SaDocumentTree{ProjectID: first.ID, OwnerID: 1, Kind: models.DocumentKindFile, Name: "旧项目资料.md", NormalizedName: "旧项目资料.md", Extension: ".md", Revision: 1}
 	require.NoError(t, database.Create(&document).Error)
 	require.NoError(t, NewService(database).ShareObject(task.ID, "document", document.ID))
 	body := bytes.NewBufferString(fmt.Sprintf(`{"title":"迁移任务","description":"已移动","completed":false,"nextProjectId":%q}`, strings.ToUpper(second.Identity)))
diff --git a/backend/internal/logic/tasks/service_test.go b/backend/internal/logic/tasks/service_test.go
index fe2719c..f24b550 100644
--- a/backend/internal/logic/tasks/service_test.go
+++ b/backend/internal/logic/tasks/service_test.go
@@ -24,7 +24,7 @@ func TestUpdateLocksTaskBeforeProjectValidation(t *testing.T) {
 
 func TestShareObjectLocksTaskBeforeObjectValidation(t *testing.T) {
 	database, _, project, task := newTaskLockFixture(t)
-	document := models.SaDocumentTree{ProjectID: project.ID, CreatedBy: task.CreatedBy, Kind: models.DocumentKindFile, Name: "Context.md", NormalizedName: "context.md", Extension: ".md", Revision: 1}
+	document := models.SaDocumentTree{ProjectID: project.ID, OwnerID: task.CreatedBy, Kind: models.DocumentKindFile, Name: "Context.md", NormalizedName: "context.md", Extension: ".md", Revision: 1}
 	require.NoError(t, database.Create(&document).Error)
 	queries := captureTaskQueryOrder(t, database)
 
@@ -39,7 +39,7 @@ func TestAssigneeOnlySeesExplicitlySharedObjects(t *testing.T) {
 	database := newTestDB(t)
 	assigneeID := uint(2)
 	task := models.SaTask{ProjectID: 1, CreatedBy: 1, AssigneeID: &assigneeID, Title: "处理合同"}
-	document := models.SaDocumentTree{ProjectID: 1, CreatedBy: 1, Kind: models.DocumentKindFile, Name: "合同背景.md", NormalizedName: "合同背景.md", Extension: ".md", Revision: 1}
+	document := models.SaDocumentTree{ProjectID: 1, OwnerID: 1, Kind: models.DocumentKindFile, Name: "合同背景.md", NormalizedName: "合同背景.md", Extension: ".md", Revision: 1}
 	require.NoError(t, database.Create(&task).Error)
 	require.NoError(t, database.Create(&document).Error)
 	service := NewService()
@@ -68,7 +68,7 @@ func TestShareObjectRejectsUnsupportedType(t *testing.T) {
 func TestShareObjectRejectsObjectFromAnotherProject(t *testing.T) {
 	database := newTestDB(t)
 	task := models.SaTask{ProjectID: 1, CreatedBy: 1, Title: "Review"}
-	document := models.SaDocumentTree{ProjectID: 2, CreatedBy: 1, Kind: models.DocumentKindFile, Name: "Other project.md", NormalizedName: "other project.md", Extension: ".md", Revision: 1}
+	document := models.SaDocumentTree{ProjectID: 2, OwnerID: 1, Kind: models.DocumentKindFile, Name: "Other project.md", NormalizedName: "other project.md", Extension: ".md", Revision: 1}
 	require.NoError(t, database.Create(&task).Error)
 	require.NoError(t, database.Create(&document).Error)
 	service := NewService()
diff --git a/backend/internal/models/document_tree.go b/backend/internal/models/document_tree.go
index 336f742..aafb930 100644
--- a/backend/internal/models/document_tree.go
+++ b/backend/internal/models/document_tree.go
@@ -19,8 +19,8 @@ type SaDocumentTree struct {
 	ParentID                *uint   `gorm:"index"`
 	ParentIdentity          *string `gorm:"type:char(36);index"`
 	ParentScope             string  `gorm:"type:char(36);not null;default:'';uniqueIndex:uidx_sa_document_sibling,priority:2"`
-	CreatedBy               uint    `gorm:"index;not null"`
-	CreatedByIdentity       string  `gorm:"type:char(36);index"`
+	OwnerID                 uint    `gorm:"index;not null"`
+	OwnerIdentity           string  `gorm:"type:char(36);index"`
 	SourceInboxItemID       *uint   `gorm:"index"`
 	SourceInboxItemIdentity *string `gorm:"type:char(36);index"`
 	Kind                    string  `gorm:"size:16;not null"`
diff --git a/backend/internal/models/identity.go b/backend/internal/models/identity.go
index 71ff87f..80a9b88 100644
--- a/backend/internal/models/identity.go
+++ b/backend/internal/models/identity.go
@@ -82,7 +82,7 @@ func (m *SaDocumentTree) BeforeCreate(tx *gorm.DB) error {
 	if err := resolveIdentity(tx, &SaProject{}, m.ProjectID, &m.ProjectIdentity); err != nil {
 		return err
 	}
-	if err := resolveIdentity(tx, &SaUser{}, m.CreatedBy, &m.CreatedByIdentity); err != nil {
+	if err := resolveIdentity(tx, &SaUser{}, m.OwnerID, &m.OwnerIdentity); err != nil {
 		return err
 	}
 	if err := resolveOptionalIdentity(tx, &SaDocumentTree{}, m.ParentID, &m.ParentIdentity); err != nil {
diff --git a/backend/internal/models/legacy_tables.go b/backend/internal/models/legacy_tables.go
index 0fe6844..c3706c3 100644
--- a/backend/internal/models/legacy_tables.go
+++ b/backend/internal/models/legacy_tables.go
@@ -44,5 +44,21 @@ func renameLegacyTables(database *gorm.DB) error {
 			return fmt.Errorf("rename legacy table %s to %s: %w", table.legacy, table.current, err)
 		}
 	}
+	if migrator.HasTable("sa_documents") {
+		for _, column := range []struct {
+			legacy  string
+			current string
+		}{
+			{legacy: "created_by", current: "owner_id"},
+			{legacy: "created_by_identity", current: "owner_identity"},
+		} {
+			if !migrator.HasColumn("sa_documents", column.legacy) || migrator.HasColumn("sa_documents", column.current) {
+				continue
+			}
+			if err := migrator.RenameColumn("sa_documents", column.legacy, column.current); err != nil {
+				return fmt.Errorf("rename sa_documents column %s to %s: %w", column.legacy, column.current, err)
+			}
+		}
+	}
 	return nil
 }
diff --git a/backend/internal/models/migrations_test.go b/backend/internal/models/migrations_test.go
index b584a8b..417ac53 100644
--- a/backend/internal/models/migrations_test.go
+++ b/backend/internal/models/migrations_test.go
@@ -87,6 +87,36 @@ func TestAutoMigrateRejectsAmbiguousLegacyAndCurrentTables(t *testing.T) {
 	require.EqualError(t, err, "cannot rename legacy table senlin_agent_users: target table sa_users already exists")
 }
 
+func TestRenameLegacyTablesRenamesDocumentOwnerColumns(t *testing.T) {
+	database, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())), &gorm.Config{})
+	require.NoError(t, err)
+	require.NoError(t, database.Exec(`
+		CREATE TABLE sa_documents (
+			id integer primary key,
+			created_by integer not null,
+			created_by_identity text
+		)
+	`).Error)
+	require.NoError(t, database.Exec(`
+		INSERT INTO sa_documents (id, created_by, created_by_identity)
+		VALUES (1, 7, 'owner-identity')
+	`).Error)
+
+	require.NoError(t, renameLegacyTables(database))
+	require.False(t, database.Migrator().HasColumn("sa_documents", "created_by"))
+	require.False(t, database.Migrator().HasColumn("sa_documents", "created_by_identity"))
+	require.True(t, database.Migrator().HasColumn("sa_documents", "owner_id"))
+	require.True(t, database.Migrator().HasColumn("sa_documents", "owner_identity"))
+
+	var stored struct {
+		OwnerID       uint
+		OwnerIdentity string
+	}
+	require.NoError(t, database.Table("sa_documents").Where("id = ?", 1).Take(&stored).Error)
+	require.Equal(t, uint(7), stored.OwnerID)
+	require.Equal(t, "owner-identity", stored.OwnerIdentity)
+}
+
 func projectIdentifiers(projects []SaProject) []string {
 	result := make([]string, 0, len(projects))
 	for _, project := range projects {
diff --git a/backend/internal/seed/demo.go b/backend/internal/seed/demo.go
index dbd4904..2814ae2 100644
--- a/backend/internal/seed/demo.go
+++ b/backend/internal/seed/demo.go
@@ -266,7 +266,7 @@ func firstOrCreateDocument(tx *gorm.DB, projectID, userID uint, name, markdown s
 		return err
 	}
 	document = models.SaDocumentTree{
-		ProjectID: projectID, CreatedBy: userID, Kind: models.DocumentKindFile,
+		ProjectID: projectID, OwnerID: userID, Kind: models.DocumentKindFile,
 		Name: name, NormalizedName: strings.ToLower(name), Extension: ".md",
 		MimeType: "text/markdown; charset=utf-8", Size: int64(len([]byte(markdown))),
 		Revision: 1, ScanStatus: "not_scanned",