diff --git a/internal/apps/project/constants.go b/internal/apps/project/constants.go
index 253ebe9..05d2a0d 100644
--- a/internal/apps/project/constants.go
+++ b/internal/apps/project/constants.go
@@ -26,6 +26,8 @@ package project
 
 const (
 	ProjectObjKey = "project_obj"
+	// projectItemInsertBatchSize limits batch inserts to avoid exceeding MySQL's placeholder ceiling.
+	projectItemInsertBatchSize = 1000
 )
 
 type DistributionType int8
diff --git a/internal/apps/project/models.go b/internal/apps/project/models.go
index 5b76df3..1514f30 100644
--- a/internal/apps/project/models.go
+++ b/internal/apps/project/models.go
@@ -239,7 +239,7 @@ func (p *Project) CreateItems(ctx context.Context, tx *gorm.DB, items []string,
 			projectItems[i] = wi.item
 		}
 
-		if err := tx.Create(&projectItems).Error; err != nil {
+		if err := tx.CreateInBatches(&projectItems, projectItemInsertBatchSize).Error; err != nil {
 			return err
 		}
 
@@ -259,7 +259,7 @@ func (p *Project) CreateItems(ctx context.Context, tx *gorm.DB, items []string,
 			projectItems[i] = ProjectItem{ProjectID: p.ID, Content: content}
 		}
 
-		if err := tx.Create(&projectItems).Error; err != nil {
+		if err := tx.CreateInBatches(&projectItems, projectItemInsertBatchSize).Error; err != nil {
 			return err
 		}