定义model

internal/infra/models/pig.go

@@ -39,7 +39,6 @@ type PigBatch struct {
 	InitialCount     int                `gorm:"not null;comment:初始数量"`
 	CurrentCount     int                `gorm:"not null;comment:当前存栏数量"`
 	CurrentSickCount int                `gorm:"not null;default:0;comment:当前病猪数量"`
-	AverageWeight    float64            `gorm:"comment:平均体重 (kg)"`
 	Status           PigBatchStatus     `gorm:"size:20;not null;index;comment:批次状态"`
 	Pens             []Pen              `gorm:"foreignKey:PigBatchID;comment:所在圈舍ID"`
 }
@@ -64,7 +63,7 @@ const (
 
 // PigBatchLog 记录了猪批次数量或状态的每一次变更
 type PigBatchLog struct {
-	ID              uint          `gorm:"primaryKey"`
+	gorm.Model
 	PigBatchID      uint          `gorm:"not null;index;comment:关联的猪批次ID"`
 	ChangeType      LogChangeType `gorm:"size:20;not null;comment:变更类型"`
 	ChangeCount     int           `gorm:"not null;comment:数量变化,负数表示减少"`
@@ -75,11 +74,35 @@ type PigBatchLog struct {
 	AfterSickCount  int           `gorm:"not null;comment:变更后病猪数"`
 	Operator        string        `gorm:"size:50;comment:操作员"`
 	HappenedAt      time.Time     `gorm:"primaryKey;comment:事件发生时间"`
-	CreatedAt       time.Time
-	UpdatedAt       time.Time
-	DeletedAt       gorm.DeletedAt `gorm:"index"`
 }
 
 func (PigBatchLog) TableName() string {
 	return "pig_batch_logs"
 }
+
+// WeighingBatch 记录了一次批次称重的信息
+type WeighingBatch struct {
+	gorm.Model
+	WeighingTime time.Time `gorm:"primaryKey;comment:称重时间"`
+	Description  string    `gorm:"size:255;comment:批次称重描述"`
+	PigBatchID   uint      `gorm:"not null;index;comment:关联的猪批次ID"`
+}
+
+func (WeighingBatch) TableName() string {
+	return "weighing_batches"
+}
+
+// WeighingRecord 记录了单次称重信息
+type WeighingRecord struct {
+	gorm.Model
+	Weight          float64   `gorm:"not null;comment:单只猪重量 (kg)"`
+	WeighingBatchID uint      `gorm:"not null;index;comment:关联的批次称重ID"`
+	PenID           uint      `gorm:"not null;index;comment:所在猪圈ID"`
+	OperatorID      uint      `gorm:"not null;comment:操作员ID"`
+	Remark          string    `gorm:"size:255;comment:备注"`
+	WeighingTime    time.Time `gorm:"primaryKey;comment:称重时间"`
+}
+
+func (WeighingRecord) TableName() string {
+	return "weighing_records"
+}