定义model

internal/infra/models/pig.go

@@ -36,9 +36,8 @@ type PigBatch struct {
 	BatchNumber  string             `gorm:"size:50;not null;uniqueIndex;comment:批次编号,如 2024-W25-A01"`
 	OriginType   PigBatchOriginType `gorm:"size:20;not null;comment:批次来源 (自繁, 外购)"`
 	StartDate    time.Time          `gorm:"not null;comment:批次开始日期 (如转入日或购买日)"`
+	EndDate      time.Time          `gorm:"not null;comment:批次结束日期 (全部淘汰或售出)"`
 	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"`
 	Status       PigBatchStatus     `gorm:"size:20;not null;index;comment:批次状态"`
 }