diff --git a/pkg/services/accounts.go b/pkg/services/accounts.go
index de8c5407..2c6fd445 100644
--- a/pkg/services/accounts.go
+++ b/pkg/services/accounts.go
@@ -201,28 +201,25 @@ func (s *AccountService) CreateAccounts(c core.Context, mainAccount *models.Acco
 		return errs.ErrUserIdInvalid
 	}
 
+	needAccountUuidCount := uint16(len(childrenAccounts) + 1)
+	accountUuids := s.GenerateUuids(uuid.UUID_TYPE_ACCOUNT, needAccountUuidCount)
+
+	if len(accountUuids) < int(needAccountUuidCount) {
+		return errs.ErrSystemIsBusy
+	}
+
 	now := time.Now().Unix()
 
 	allAccounts := make([]*models.Account, len(childrenAccounts)+1)
 	var allInitTransactions []*models.Transaction
 
-	mainAccount.AccountId = s.GenerateUuid(uuid.UUID_TYPE_ACCOUNT)
-
-	if mainAccount.AccountId < 1 {
-		return errs.ErrSystemIsBusy
-	}
-
+	mainAccount.AccountId = accountUuids[0]
 	allAccounts[0] = mainAccount
 
 	if mainAccount.Type == models.ACCOUNT_TYPE_MULTI_SUB_ACCOUNTS {
 		for i := 0; i < len(childrenAccounts); i++ {
 			childAccount := childrenAccounts[i]
-			childAccount.AccountId = s.GenerateUuid(uuid.UUID_TYPE_ACCOUNT)
-
-			if childAccount.AccountId < 1 {
-				return errs.ErrSystemIsBusy
-			}
-
+			childAccount.AccountId = accountUuids[i+1]
 			childAccount.ParentAccountId = mainAccount.AccountId
 			childAccount.Uid = mainAccount.Uid
 			childAccount.Type = models.ACCOUNT_TYPE_SINGLE_ACCOUNT
diff --git a/pkg/services/transaction_categories.go b/pkg/services/transaction_categories.go
index 1aedab3a..0af6f4b3 100644
--- a/pkg/services/transaction_categories.go
+++ b/pkg/services/transaction_categories.go
@@ -229,14 +229,16 @@ func (s *TransactionCategoryService) CreateCategories(c core.Context, uid int64,
 	var allCategories []*models.TransactionCategory
 	primaryCategories := categories[nil]
 
+	needPrimaryCategoryUuidCount := uint16(len(primaryCategories))
+	primaryCategoryUuids := s.GenerateUuids(uuid.UUID_TYPE_CATEGORY, needPrimaryCategoryUuidCount)
+
+	if len(primaryCategoryUuids) < int(needPrimaryCategoryUuidCount) {
+		return nil, errs.ErrSystemIsBusy
+	}
+
 	for i := 0; i < len(primaryCategories); i++ {
 		primaryCategory := primaryCategories[i]
-		primaryCategory.CategoryId = s.GenerateUuid(uuid.UUID_TYPE_CATEGORY)
-
-		if primaryCategory.CategoryId < 1 {
-			return nil, errs.ErrSystemIsBusy
-		}
-
+		primaryCategory.CategoryId = primaryCategoryUuids[i]
 		primaryCategory.Deleted = false
 		primaryCategory.CreatedUnixTime = time.Now().Unix()
 		primaryCategory.UpdatedUnixTime = time.Now().Unix()
@@ -245,16 +247,17 @@ func (s *TransactionCategoryService) CreateCategories(c core.Context, uid int64,
 
 		secondaryCategories := categories[primaryCategory]
 
+		needSecondaryCategoryUuidCount := uint16(len(secondaryCategories))
+		secondaryCategoryUuids := s.GenerateUuids(uuid.UUID_TYPE_CATEGORY, needSecondaryCategoryUuidCount)
+
+		if len(secondaryCategoryUuids) < int(needSecondaryCategoryUuidCount) {
+			return nil, errs.ErrSystemIsBusy
+		}
+
 		for j := 0; j < len(secondaryCategories); j++ {
 			secondaryCategory := secondaryCategories[j]
-			secondaryCategory.CategoryId = s.GenerateUuid(uuid.UUID_TYPE_CATEGORY)
-
-			if secondaryCategory.CategoryId < 1 {
-				return nil, errs.ErrSystemIsBusy
-			}
-
+			secondaryCategory.CategoryId = secondaryCategoryUuids[j]
 			secondaryCategory.ParentCategoryId = primaryCategory.CategoryId
-
 			secondaryCategory.Deleted = false
 			secondaryCategory.CreatedUnixTime = time.Now().Unix()
 			secondaryCategory.UpdatedUnixTime = time.Now().Unix()
diff --git a/pkg/services/transactions.go b/pkg/services/transactions.go
index bd7ed310..6016eb44 100644
--- a/pkg/services/transactions.go
+++ b/pkg/services/transactions.go
@@ -525,6 +525,13 @@ func (s *TransactionService) ModifyTransaction(c core.Context, transaction *mode
 		return errs.ErrUserIdInvalid
 	}
 
+	needTagIndexUuidCount := uint16(len(addTagIds))
+	tagIndexUuids := s.GenerateUuids(uuid.UUID_TYPE_TAG_INDEX, needTagIndexUuidCount)
+
+	if len(tagIndexUuids) < int(needTagIndexUuidCount) {
+		return errs.ErrSystemIsBusy
+	}
+
 	updateCols := make([]string, 0, 16)
 
 	now := time.Now().Unix()
@@ -539,14 +546,8 @@ func (s *TransactionService) ModifyTransaction(c core.Context, transaction *mode
 	transactionTagIndexes := make([]*models.TransactionTagIndex, len(addTagIds))
 
 	for i := 0; i < len(addTagIds); i++ {
-		tagIndexId := s.GenerateUuid(uuid.UUID_TYPE_TAG_INDEX)
-
-		if tagIndexId < 1 {
-			return errs.ErrSystemIsBusy
-		}
-
 		transactionTagIndexes[i] = &models.TransactionTagIndex{
-			TagIndexId:      tagIndexId,
+			TagIndexId:      tagIndexUuids[i],
 			Uid:             transaction.Uid,
 			Deleted:         false,
 			TagId:           addTagIds[i],