定义model

internal/infra/models/feed.go

@@ -25,7 +25,7 @@ func (RawMaterial) TableName() string {
 
 // RawMaterialPurchase 记录了原料的每一次采购。
 type RawMaterialPurchase struct {
-	ID            uint        `gorm:"primaryKey"`
+	gorm.Model
 	RawMaterialID uint        `gorm:"not null;index;comment:关联的原料ID"`
 	RawMaterial   RawMaterial `gorm:"foreignKey:RawMaterialID"`
 	Supplier      string      `gorm:"size:100;comment:供应商"`
@@ -34,8 +34,6 @@ type RawMaterialPurchase struct {
 	TotalPrice    float64     `gorm:"comment:总价"`
 	PurchaseDate  time.Time   `gorm:"primaryKey;comment:采购日期"`
 	CreatedAt     time.Time
-	UpdatedAt     time.Time
-	DeletedAt     gorm.DeletedAt `gorm:"index"`
 }
 
 func (RawMaterialPurchase) TableName() string {
@@ -56,16 +54,13 @@ const (
 
 // RawMaterialStockLog 记录了原料库存的所有变动，提供了完整的追溯链。
 type RawMaterialStockLog struct {
-	ID            uint               `gorm:"primaryKey"`
+	gorm.Model
 	RawMaterialID uint               `gorm:"not null;index;comment:关联的原料ID"`
 	ChangeAmount  float64            `gorm:"not null;comment:变动数量, 正数为入库, 负数为出库"`
 	SourceType    StockLogSourceType `gorm:"size:50;not null;index;comment:库存变动来源类型"`
 	SourceID      uint               `gorm:"not null;index;comment:来源记录的ID (如 RawMaterialPurchase.ID 或 FeedUsageRecord.ID)"`
 	HappenedAt    time.Time          `gorm:"primaryKey;comment:业务发生时间"`
 	Remarks       string             `gorm:"comment:备注, 如主动领取的理由等"`
-	CreatedAt     time.Time
-	UpdatedAt     time.Time
-	DeletedAt     gorm.DeletedAt `gorm:"index"`
 }
 
 func (RawMaterialStockLog) TableName() string {
@@ -102,7 +97,7 @@ func (FeedFormulaComponent) TableName() string {
 // 应用层逻辑：当一条使用记录被创建时，应根据其使用的 FeedFormula,
 // 计算出每种 RawMaterial 的消耗量，并在 RawMaterialStockLog 中创建对应的出库记录。
 type FeedUsageRecord struct {
-	ID            uint        `gorm:"primaryKey"`
+	gorm.Model
 	PenID         uint        `gorm:"not null;index;comment:关联的猪栏ID"`
 	Pen           Pen         `gorm:"foreignKey:PenID"`
 	FeedFormulaID uint        `gorm:"not null;index;comment:使用的饲料配方ID"`
@@ -111,9 +106,6 @@ type FeedUsageRecord struct {
 	RecordedAt    time.Time   `gorm:"primaryKey;comment:记录时间"`
 	OperatorID    uint        `gorm:"not null;comment:操作员"`
 	Remarks       string      `gorm:"comment:备注, 如 '例行喂料, 弱猪补料' 等"`
-	CreatedAt     time.Time
-	UpdatedAt     time.Time
-	DeletedAt     gorm.DeletedAt `gorm:"index"`
 }
 
 func (FeedUsageRecord) TableName() string {