refac: removed ugly multi-line method chaining

internal/infrastructure/persistence/repositories/imageVariantUsageRepository.go

@@ -40,10 +40,10 @@ func (v *VariantUsageRepository) Record(batch domain.VariantUsageBatch) error {
 
 func recordHit(tx *gorm.DB, hit domain.VariantHit) error {
 	at := hit.At.UTC()
-	return tx.Model(&entity.ImageVariantFile{}).
-		Where("variant_name = ? AND source_name = ?", hit.VariantName, hit.SourceName).
-		Where("last_requested_at IS NULL OR last_requested_at < ?", at).
-		Update("last_requested_at", at).Error
+	query := tx.Model(&entity.ImageVariantFile{})
+	query = query.Where("variant_name = ? AND source_name = ?", hit.VariantName, hit.SourceName)
+	query = query.Where("last_requested_at IS NULL OR last_requested_at < ?", at)
+	return query.Update("last_requested_at", at).Error
 }
 
 func recordRejections(tx *gorm.DB, rejection domain.RejectionCount) error {
@@ -56,9 +56,9 @@ func recordRejections(tx *gorm.DB, rejection domain.RejectionCount) error {
 
 func (v *VariantUsageRepository) RejectedSince(day time.Time) (int, error) {
 	var total int
-	err := v.db.Model(&entity.ImageVariantRejectionDay{}).
-		Select("COALESCE(SUM(count), 0)").
-		Where("day >= ?", day.UTC().Format(domain.RejectionDayLayout)).
-		Scan(&total).Error
+	query := v.db.Model(&entity.ImageVariantRejectionDay{})
+	query = query.Select("COALESCE(SUM(count), 0)")
+	query = query.Where("day >= ?", day.UTC().Format(domain.RejectionDayLayout))
+	err := query.Scan(&total).Error
 	return total, err
 }