diff --git a/backend/app/api/api_v1/routers/platform.py b/backend/app/api/api_v1/routers/platform.py
index 0a3e421..2ab6b46 100644
--- a/backend/app/api/api_v1/routers/platform.py
+++ b/backend/app/api/api_v1/routers/platform.py
@@ -254,7 +254,7 @@ async def userdomain_details(
 async def create_userdomain(
     request: Request,
     userid: int,
-    domainids:list,
+    domainids:List[int] ,
     db=Depends(get_db),
 ):
     try:
diff --git a/backend/app/db/crud.py b/backend/app/db/crud.py
index 0ee5161..c697446 100644
--- a/backend/app/db/crud.py
+++ b/backend/app/db/crud.py
@@ -224,16 +224,11 @@ def edit_domain(
     db.refresh(db_domain)
     return db_domain
 
-def add_userdomain(db: Session, userid:int,domainids:list):
-    for domainid in domainids:
-        db_domain = models.UserDomain(
-            userid = userid,
-            domainid = domainid
-        )
-        db.add(db_domain)
+def add_userdomain(db: Session, userid:int,domainids:list[str]):
+    dbCommits = list(map(lambda domainid: models.UserDomain(userid = userid, domainid = domainid ), domainids))
+    db.bulk_save_objects(dbCommits)
     db.commit()
-    db.refresh(db_domain)
-    return db_domain
+    return dbCommits
 
 def delete_userdomain(db: Session, userid: int,domainid: int):
     db_domain = db.query(models.UserDomain).filter(and_(models.UserDomain.userid == userid,models.UserDomain.domainid == domainid)).first()