Implement warehouse/lot pricing updates and configurator performance fixes

internal/models/lot.go

@@ -41,7 +41,7 @@ func (Supplier) TableName() string {
 // StockLog stores warehouse stock snapshots imported from external files.
 type StockLog struct {
 	StockLogID uint      `gorm:"column:stock_log_id;primaryKey;autoIncrement"`
-	Lot        string    `gorm:"column:lot;size:255;not null"`
+	Partnumber string    `gorm:"column:partnumber;size:255;not null"`
 	Supplier   *string   `gorm:"column:supplier;size:255"`
 	Date       time.Time `gorm:"column:date;type:date;not null"`
 	Price      float64   `gorm:"column:price;not null"`