diff --git a/internal/biz/announcement.go b/internal/biz/announcement.go
index 0e468b4..a1e8165 100644
--- a/internal/biz/announcement.go
+++ b/internal/biz/announcement.go
@@ -12,7 +12,7 @@ type Announcement struct {
 	UpdatedAt   time.Time
 	Title       string
 	Content     string
-	UserID      *uint
+	UserID      *int
 	Attachments json.RawMessage
 }
 
diff --git a/internal/biz/audit.go b/internal/biz/audit.go
index be37bde..42e835e 100644
--- a/internal/biz/audit.go
+++ b/internal/biz/audit.go
@@ -100,10 +100,10 @@ type AuditRecordRepo interface {
 type AuditQueryRepo interface {
 	ListOperations(context.Context, int, int, *OperationRecord) ([]*OperationRecord, int64, error)
 	FindOperation(context.Context, uint) (*OperationRecord, error)
-	DeleteOperations(context.Context, []uint) error
+	DeleteOperations(context.Context, []int) error
 	ListLogins(context.Context, int, int, *LoginLog) ([]*LoginLog, int64, error)
 	FindLogin(context.Context, uint) (*LoginLog, error)
-	DeleteLogins(context.Context, []uint) error
+	DeleteLogins(context.Context, []int) error
 	ListDataAccess(context.Context, int, int, *DataAccessLog) ([]*DataAccessLog, int64, error)
 	DeleteDataAccess(context.Context, []uint) error
 	UpdateError(context.Context, *ErrorRecord) error
diff --git a/internal/data/announcement.go b/internal/data/announcement.go
index fb4adcd..c1fa2df 100644
--- a/internal/data/announcement.go
+++ b/internal/data/announcement.go
@@ -17,7 +17,7 @@ type announcementPO struct {
 	DeletedAt   gorm.DeletedAt `gorm:"index"`
 	Title       string
 	Content     string `gorm:"type:text"`
-	UserID      *uint  `gorm:"column:user_id"`
+	UserID      *int   `gorm:"column:user_id"`
 	Attachments jsonPO
 }
 
diff --git a/internal/data/announcement_test.go b/internal/data/announcement_test.go
index bd51086..d9687cb 100644
--- a/internal/data/announcement_test.go
+++ b/internal/data/announcement_test.go
@@ -38,3 +38,22 @@ func TestAnnouncementRepositoryKeepsRawIDQuerySemantics(t *testing.T) {
 		t.Fatalf("raw invalid ID removed rows: count=%d", count)
 	}
 }
+
+func TestAnnouncementRepositoryPreservesSignedUserID(t *testing.T) {
+	data := newTransactionTestData(t)
+	repo := &announcementRepo{data: data}
+	ctx := context.Background()
+	userID := -1
+	item := &biz.Announcement{Title: "notice", UserID: &userID}
+	if err := repo.Create(ctx, item); err != nil {
+		t.Fatal(err)
+	}
+
+	found, err := repo.Find(ctx, "1")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if found.UserID == nil || *found.UserID != userID {
+		t.Fatalf("found user ID = %v, want %d", found.UserID, userID)
+	}
+}
diff --git a/internal/data/audit_delete_test.go b/internal/data/audit_delete_test.go
new file mode 100644
index 0000000..cfc0332
--- /dev/null
+++ b/internal/data/audit_delete_test.go
@@ -0,0 +1,25 @@
+package data
+
+import (
+	"context"
+	"testing"
+)
+
+func TestAuditSingleZeroDeleteFailsAndSignedBatchIsAccepted(t *testing.T) {
+	data := newTransactionTestData(t)
+	repo := &auditQueryRepo{data: data}
+	ctx := context.Background()
+
+	if err := repo.DeleteOperations(ctx, []int{0}); err == nil {
+		t.Fatal("operation single delete with ID zero must fail")
+	}
+	if err := repo.DeleteLogins(ctx, []int{0}); err == nil {
+		t.Fatal("login single delete with ID zero must fail")
+	}
+	if err := repo.DeleteOperations(ctx, []int{-1}); err != nil {
+		t.Fatalf("operation signed batch delete failed: %v", err)
+	}
+	if err := repo.DeleteLogins(ctx, []int{-1}); err != nil {
+		t.Fatalf("login signed batch delete failed: %v", err)
+	}
+}
diff --git a/internal/data/department.go b/internal/data/department.go
index d6fc7c5..5826fb6 100644
--- a/internal/data/department.go
+++ b/internal/data/department.go
@@ -32,7 +32,7 @@ type departmentPO struct {
 func (departmentPO) TableName() string { return "sys_departments" }
 
 type userDepartmentPO struct {
-	// Match GVA's join model: no composite primary key, so repeated IDs in a
+	// Match the reference join model: no composite primary key, so repeated IDs in a
 	// request are persisted in the same order/shape as the reference service.
 	UserID       uint `gorm:"column:sys_user_id"`
 	DepartmentID uint `gorm:"column:sys_department_id"`
diff --git a/internal/data/login_log.go b/internal/data/login_log.go
index 8e17d38..0d990ae 100644
--- a/internal/data/login_log.go
+++ b/internal/data/login_log.go
@@ -73,6 +73,9 @@ func (r *auditQueryRepo) FindLogin(ctx context.Context, id uint) (*biz.LoginLog,
 	}
 	return loginFromPO(po), nil
 }
-func (r *auditQueryRepo) DeleteLogins(ctx context.Context, ids []uint) error {
+func (r *auditQueryRepo) DeleteLogins(ctx context.Context, ids []int) error {
+	if len(ids) == 1 && ids[0] == 0 {
+		return r.data.gormDB.WithContext(ctx).Delete(&loginLogPO{}).Error
+	}
 	return r.data.gormDB.WithContext(ctx).Delete(&loginLogPO{}, "id IN ?", ids).Error
 }
diff --git a/internal/data/operation_log.go b/internal/data/operation_log.go
index a5a4ee2..4943455 100644
--- a/internal/data/operation_log.go
+++ b/internal/data/operation_log.go
@@ -97,6 +97,10 @@ func (r *auditQueryRepo) FindOperation(ctx context.Context, id uint) (*biz.Opera
 	}
 	return opFromPO(po), nil
 }
-func (r *auditQueryRepo) DeleteOperations(ctx context.Context, ids []uint) error {
+
+func (r *auditQueryRepo) DeleteOperations(ctx context.Context, ids []int) error {
+	if len(ids) == 1 && ids[0] == 0 {
+		return r.data.gormDB.WithContext(ctx).Delete(&operationPO{}).Error
+	}
 	return r.data.gormDB.WithContext(ctx).Delete(&operationPO{}, "id IN ?", ids).Error
 }
diff --git a/internal/data/position.go b/internal/data/position.go
index 970ede1..da0d9c9 100644
--- a/internal/data/position.go
+++ b/internal/data/position.go
@@ -29,7 +29,7 @@ type positionPO struct {
 func (positionPO) TableName() string { return "sys_positions" }
 
 type userPositionPO struct {
-	// GVA does not declare a key on this explicit join model.  Do not let a
+	// The reference implementation does not declare a key on this explicit join model. Do not let a
 	// database uniqueness constraint change duplicate-assignment behavior.
 	UserID     uint `gorm:"column:sys_user_id"`
 	PositionID uint `gorm:"column:sys_position_id"`
diff --git a/internal/data/system.go b/internal/data/system.go
index ede6306..5133a6e 100644
--- a/internal/data/system.go
+++ b/internal/data/system.go
@@ -67,7 +67,7 @@ type menuPO struct {
 func (menuPO) TableName() string { return "sys_base_menus" }
 
 type userAuthorityPO struct {
-	// GVA's explicit join model deliberately has no primary key or uniqueness
+	// The reference join model deliberately has no primary key or uniqueness
 	// constraint.  Keep duplicate IDs representable; association replacement
 	// and validation are handled by the service transaction instead.
 	SysUserID               uint `gorm:"column:sys_user_id"`
diff --git a/internal/data/transactions_test.go b/internal/data/transactions_test.go
index 849de81..325a510 100644
--- a/internal/data/transactions_test.go
+++ b/internal/data/transactions_test.go
@@ -41,7 +41,7 @@ func TestUserAuthorityWritesAreAtomic(t *testing.T) {
 		t.Fatalf("authority links = %d, err = %v", links, err)
 	}
 
-	// With strict authority checks disabled, GVA writes the supplied join rows
+	// With strict authority checks disabled, the reference implementation writes the supplied join rows
 	// without first requiring every role record to exist.
 	created.NickName = "compatible update"
 	if err = repo.UpdateUserWithAuthorities(ctx, created, []uint{888, 123456}); err != nil {
diff --git a/internal/server/handler/audit.go b/internal/server/handler/audit.go
index 10af202..f57851e 100644
--- a/internal/server/handler/audit.go
+++ b/internal/server/handler/audit.go
@@ -100,14 +100,14 @@ func (h *Audit) DeleteOperation(c *gin.Context) {
 		httpx.Fail(c, err.Error())
 		return
 	}
-	if err := h.service.DeleteOperations(c.Request.Context(), []uint{req.ID}); err != nil {
+	if err := h.service.DeleteOperations(c.Request.Context(), []int{int(req.ID)}); err != nil {
 		httpx.Fail(c, "删除失败")
 		return
 	}
 	httpx.Write(c, httpx.CodeSuccess, gin.H{}, "删除成功")
 }
 func (h *Audit) DeleteOperations(c *gin.Context) {
-	var req dto.IDsRequest
+	var req dto.AuditIDsRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
 		httpx.Fail(c, err.Error())
 		return
@@ -151,14 +151,14 @@ func (h *Audit) DeleteLogin(c *gin.Context) {
 		httpx.Fail(c, err.Error())
 		return
 	}
-	if err := h.service.DeleteLogins(c.Request.Context(), []uint{req.ID}); err != nil {
+	if err := h.service.DeleteLogins(c.Request.Context(), []int{int(req.ID)}); err != nil {
 		httpx.Fail(c, "删除失败")
 		return
 	}
 	httpx.Write(c, httpx.CodeSuccess, gin.H{}, "删除成功")
 }
 func (h *Audit) DeleteLogins(c *gin.Context) {
-	var req dto.IDsRequest
+	var req dto.AuditIDsRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
 		httpx.Fail(c, err.Error())
 		return
diff --git a/internal/service/announcement.go b/internal/service/announcement.go
index 8adac38..b85a727 100644
--- a/internal/service/announcement.go
+++ b/internal/service/announcement.go
@@ -13,7 +13,7 @@ type AnnouncementInput struct {
 	ID          uint
 	Title       string
 	Content     string
-	UserID      *uint
+	UserID      *int
 	Attachments json.RawMessage
 }
 
diff --git a/internal/service/audit.go b/internal/service/audit.go
index 0a31a27..01fa45b 100644
--- a/internal/service/audit.go
+++ b/internal/service/audit.go
@@ -49,7 +49,7 @@ func (s *AuditService) Operation(ctx context.Context, id uint) (*dto.OperationRe
 	}
 	return opDTO(v), nil
 }
-func (s *AuditService) DeleteOperations(ctx context.Context, ids []uint) error {
+func (s *AuditService) DeleteOperations(ctx context.Context, ids []int) error {
 	return s.uc.DeleteOperations(ctx, ids)
 }
 
@@ -87,7 +87,7 @@ func (s *AuditService) Login(ctx context.Context, id uint) (*dto.LoginLogRespons
 	}
 	return loginDTO(v), nil
 }
-func (s *AuditService) DeleteLogins(ctx context.Context, ids []uint) error {
+func (s *AuditService) DeleteLogins(ctx context.Context, ids []int) error {
 	return s.uc.DeleteLogins(ctx, ids)
 }
 
diff --git a/internal/service/dto/announcement.go b/internal/service/dto/announcement.go
index 4070d83..9172479 100644
--- a/internal/service/dto/announcement.go
+++ b/internal/service/dto/announcement.go
@@ -9,7 +9,7 @@ type AnnouncementRequest struct {
 	ID          uint            `json:"ID"`
 	Title       string          `json:"title"`
 	Content     string          `json:"content"`
-	UserID      *uint           `json:"userID"`
+	UserID      *int            `json:"userID"`
 	Attachments json.RawMessage `json:"attachments"`
 }
 
@@ -29,7 +29,7 @@ type AnnouncementResponse struct {
 	DeletedAt   any    `json:"-"`
 	Title       string `json:"title"`
 	Content     string `json:"content"`
-	UserID      *uint  `json:"userID"`
+	UserID      *int   `json:"userID"`
 	Attachments any    `json:"attachments"`
 }
 
diff --git a/internal/service/dto/audit.go b/internal/service/dto/audit.go
index 29decd9..224c4fb 100644
--- a/internal/service/dto/audit.go
+++ b/internal/service/dto/audit.go
@@ -55,6 +55,10 @@ type AuditIDQuery struct {
 	ID uint `form:"ID"`
 }
 
+type AuditIDsRequest struct {
+	IDs []int `json:"ids"`
+}
+
 type ErrorRecordRequest struct {
 	Form      string `json:"form"`
 	Info      string `json:"info"`