diff --git a/internal/announcement/model.go b/internal/announcement/model.go
index 0587632..7824f38 100644
--- a/internal/announcement/model.go
+++ b/internal/announcement/model.go
@@ -1,9 +1,16 @@
 package announcement
 
-import "gorm.io/gorm"
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
 
 type Announcement struct {
-	gorm.Model
-	Title   string `gorm:"not null"`
-	Content string `gorm:"type:text;not null"`
+	ID        uint           `json:"id"        gorm:"primaryKey"`
+	CreatedAt time.Time      `json:"createdAt"`
+	UpdatedAt time.Time      `json:"updatedAt"`
+	DeletedAt gorm.DeletedAt `json:"-"         gorm:"index"`
+	Title     string         `json:"title"     gorm:"not null"`
+	Content   string         `json:"content"   gorm:"type:text;not null"`
 }
diff --git a/internal/auth/model.go b/internal/auth/model.go
index 68f1897..f859d2e 100644
--- a/internal/auth/model.go
+++ b/internal/auth/model.go
@@ -1,6 +1,10 @@
 package auth
 
-import "gorm.io/gorm"
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
 
 type Role string
 
@@ -10,8 +14,11 @@ const (
 )
 
 type User struct {
-	gorm.Model
-	Username     string `gorm:"type:varchar(100);uniqueIndex;not null"`
-	PasswordHash string `gorm:"not null"`
-	Role         Role   `gorm:"default:'user'"`
+	ID           uint           `json:"id"        gorm:"primaryKey"`
+	CreatedAt    time.Time      `json:"createdAt"`
+	UpdatedAt    time.Time      `json:"updatedAt"`
+	DeletedAt    gorm.DeletedAt `json:"-"         gorm:"index"`
+	Username     string         `json:"username"  gorm:"type:varchar(100);uniqueIndex;not null"`
+	PasswordHash string         `json:"-"         gorm:"not null"`
+	Role         Role           `json:"role"      gorm:"default:'user'"`
 }
diff --git a/internal/download/model.go b/internal/download/model.go
index 5638eab..5a78800 100644
--- a/internal/download/model.go
+++ b/internal/download/model.go
@@ -1,11 +1,18 @@
 package download
 
-import "gorm.io/gorm"
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
 
 type Info struct {
-	gorm.Model
-	URL      string `gorm:"not null"`
-	Version  string `gorm:"not null"`
-	FileName string `gorm:"not null"`
-	FileSize string `gorm:"not null"`
+	ID        uint           `json:"id"       gorm:"primaryKey"`
+	CreatedAt time.Time      `json:"createdAt"`
+	UpdatedAt time.Time      `json:"updatedAt"`
+	DeletedAt gorm.DeletedAt `json:"-"        gorm:"index"`
+	URL       string         `json:"url"      gorm:"not null"`
+	Version   string         `json:"version"  gorm:"not null"`
+	FileName  string         `json:"fileName" gorm:"not null"`
+	FileSize  string         `json:"fileSize" gorm:"not null"`
 }