定义model

internal/infra/models/medication.go

@@ -82,7 +82,7 @@ const (
 
 // GroupMedicationLog 记录了对整个猪批次的用药情况
 type GroupMedicationLog struct {
-	ID           uint                 `gorm:"primaryKey"`
+	gorm.Model
 	PigBatchID   uint                 `gorm:"not null;index;comment:关联的猪批次ID"`
 	MedicationID uint                 `gorm:"not null;index;comment:关联的药品ID"`
 	Medication   Medication           `gorm:"foreignKey:MedicationID"` // 预加载药品信息
@@ -92,9 +92,6 @@ type GroupMedicationLog struct {
 	Description  string               `gorm:"size:255;comment:具体描述,如'治疗呼吸道病'"`
 	Operator     string               `gorm:"size:50;comment:操作员"`
 	HappenedAt   time.Time            `gorm:"primaryKey;comment:用药时间"`
-	CreatedAt    time.Time
-	UpdatedAt    time.Time
-	DeletedAt    gorm.DeletedAt `gorm:"index"`
 }
 
 func (GroupMedicationLog) TableName() string {