Update pricelist repository, service, and tests

internal/services/pricelist/service.go

@@ -1,8 +1,10 @@
 package pricelist
 
 import (
+	"errors"
 	"fmt"
 	"log/slog"
+	"strings"
 	"time"
 
 	"git.mchus.pro/mchus/quoteforge/internal/models"
@@ -30,22 +32,35 @@ func (s *Service) CreateFromCurrentPrices(createdBy string) (*models.Pricelist,
 		return nil, fmt.Errorf("offline mode: cannot create pricelists")
 	}
 
-	version, err := s.repo.GenerateVersion()
-	if err != nil {
-		return nil, fmt.Errorf("generating version: %w", err)
-	}
-
 	expiresAt := time.Now().AddDate(1, 0, 0) // +1 year
+	const maxCreateAttempts = 5
+	var pricelist *models.Pricelist
+	for attempt := 1; attempt <= maxCreateAttempts; attempt++ {
+		version, err := s.repo.GenerateVersion()
+		if err != nil {
+			return nil, fmt.Errorf("generating version: %w", err)
+		}
 
-	pricelist := &models.Pricelist{
-		Version:   version,
-		CreatedBy: createdBy,
-		IsActive:  true,
-		ExpiresAt: &expiresAt,
-	}
+		pricelist = &models.Pricelist{
+			Version:   version,
+			CreatedBy: createdBy,
+			IsActive:  true,
+			ExpiresAt: &expiresAt,
+		}
 
-	if err := s.repo.Create(pricelist); err != nil {
-		return nil, fmt.Errorf("creating pricelist: %w", err)
+		if err := s.repo.Create(pricelist); err != nil {
+			if isVersionConflictError(err) && attempt < maxCreateAttempts {
+				slog.Warn("pricelist version conflict, retrying",
+					"attempt", attempt,
+					"version", version,
+					"error", err,
+				)
+				time.Sleep(time.Duration(attempt*25) * time.Millisecond)
+				continue
+			}
+			return nil, fmt.Errorf("creating pricelist: %w", err)
+		}
+		break
 	}
 
 	// Get all components with prices from qt_lot_metadata
@@ -90,6 +105,14 @@ func (s *Service) CreateFromCurrentPrices(createdBy string) (*models.Pricelist,
 	return pricelist, nil
 }
 
+func isVersionConflictError(err error) bool {
+	if errors.Is(err, gorm.ErrDuplicatedKey) {
+		return true
+	}
+	msg := strings.ToLower(err.Error())
+	return strings.Contains(msg, "duplicate entry") && strings.Contains(msg, "idx_qt_pricelists_version")
+}
+
 // List returns pricelists with pagination
 func (s *Service) List(page, perPage int) ([]models.PricelistSummary, int64, error) {
 	// If no database connection (offline mode), return empty list