diff --git a/cognee/api/v1/permissions/routers/get_permissions_router.py b/cognee/api/v1/permissions/routers/get_permissions_router.py
index 8d012d600..77ae5e4e6 100644
--- a/cognee/api/v1/permissions/routers/get_permissions_router.py
+++ b/cognee/api/v1/permissions/routers/get_permissions_router.py
@@ -1,16 +1,18 @@
-from fastapi import APIRouter, Depends, HTTPException
+from fastapi import APIRouter, Depends
 from fastapi.responses import JSONResponse
 from sqlalchemy.orm import Session
+from sqlalchemy.future import select
+from sqlalchemy import insert
 
 from cognee.modules.users.exceptions import UserNotFoundError, GroupNotFoundError
 from cognee.modules.users import get_user_db
-from cognee.modules.users.models import User, Group, Permission
+from cognee.modules.users.models import User, Group, Permission, UserGroup
 
 def get_permissions_router() -> APIRouter:
     permissions_router = APIRouter()
 
     @permissions_router.post("/groups/{group_id}/permissions")
-    async def give_permission_to_group(group_id: int, permission: str, db: Session = Depends(get_user_db)):
+    async def give_permission_to_group(group_id: str, permission: str, db: Session = Depends(get_user_db)):
         group = db.query(Group).filter(Group.id == group_id).first()
 
         if not group:
@@ -29,18 +31,21 @@ def get_permissions_router() -> APIRouter:
         return JSONResponse(status_code = 200, content = {"message": "Permission assigned to group"})
 
     @permissions_router.post("/users/{user_id}/groups")
-    async def add_user_to_group(user_id: int, group_id: int, db: Session = Depends(get_user_db)):
-        user = db.query(User).filter(User.id == user_id).first()
-        group = db.query(Group).filter(Group.id == group_id).first()
+    async def add_user_to_group(user_id: str, group_id: str, db: Session = Depends(get_user_db)):
+        user = (await db.session.execute(select(User).where(User.id == user_id))).scalars().first()
+        group = (await db.session.execute(select(Group).where(Group.id == group_id))).scalars().first()
 
         if not user:
             raise UserNotFoundError
         elif not group:
             raise GroupNotFoundError
 
-        user.groups.append(group)
+        # Add association directly to the association table
+        stmt = insert(UserGroup).values(user_id=user_id, group_id=group_id)
+        await db.session.execute(stmt)
+        #user.groups.append(group)
 
-        db.commit()
+        await db.session.commit()
 
         return JSONResponse(status_code = 200, content = {"message": "User added to group"})
 
diff --git a/cognee/modules/users/models/__init__.py b/cognee/modules/users/models/__init__.py
index 7dc1bf8ca..3d359da76 100644
--- a/cognee/modules/users/models/__init__.py
+++ b/cognee/modules/users/models/__init__.py
@@ -1,5 +1,6 @@
 from .User import User
 from .Group import Group
+from .UserGroup import UserGroup
 from .Resource import Resource
 from .Permission import Permission
 from .ACL import ACL