Implement warehouse/lot pricing updates and configurator performance fixes

internal/services/pricelist/service.go

@@ -31,8 +31,9 @@ type CreateProgress struct {
 }
 
 type CreateItemInput struct {
-	LotName string
-	Price   float64
+	LotName     string
+	Price       float64
+	PriceMethod string
 }
 
 func NewService(db *gorm.DB, repo *repository.PricelistRepository, componentRepo *repository.ComponentRepository, pricingSvc *pricing.Service) *Service {
@@ -141,6 +142,7 @@ func (s *Service) CreateForSourceWithProgress(createdBy, source string, sourceIt
 				PricelistID: pricelist.ID,
 				LotName:     strings.TrimSpace(srcItem.LotName),
 				Price:       srcItem.Price,
+				PriceMethod: strings.TrimSpace(srcItem.PriceMethod),
 			})
 		}
 	} else {
@@ -169,6 +171,11 @@ func (s *Service) CreateForSourceWithProgress(createdBy, source string, sourceIt
 		}
 	}
 
+	if len(items) == 0 {
+		_ = s.repo.Delete(pricelist.ID)
+		return nil, fmt.Errorf("cannot create empty pricelist for source %q", source)
+	}
+
 	if err := s.repo.CreateItems(items); err != nil {
 		// Clean up the pricelist if items creation fails
 		s.repo.Delete(pricelist.ID)
@@ -262,6 +269,13 @@ func (s *Service) GetItems(pricelistID uint, page, perPage int, search string) (
 	return s.repo.GetItems(pricelistID, offset, perPage, search)
 }
 
+func (s *Service) GetLotNames(pricelistID uint) ([]string, error) {
+	if s.repo == nil {
+		return []string{}, nil
+	}
+	return s.repo.GetLotNames(pricelistID)
+}
+
 // Delete deletes a pricelist by ID
 func (s *Service) Delete(id uint) error {
 	if s.repo == nil {