add limit(1) for performance

api/src/repository/user_repository.py

@@ -13,21 +13,33 @@ class UserRepository:
 
     async def get(self, user_id: int) -> Optional[Users]:
         return (
-            (await self.db.execute(select(Users).where(Users.id == user_id)))
+            (
+                await self.db.execute(
+                    select(Users).where(Users.id == user_id).limit(1)
+                )
+            )
             .scalars()
             .first()
         )
 
     async def get_by_email(self, email: str) -> Optional[Users]:
         return (
-            (await self.db.execute(select(Users).where(Users.email == email)))
+            (
+                await self.db.execute(
+                    select(Users).where(Users.email == email).limit(1)
+                )
+            )
             .scalars()
             .first()
         )
 
     async def get_by_username(self, username: str) -> Optional[Users]:
         return (
-            (await self.db.execute(select(Users).where(Users.username == username)))
+            (
+                await self.db.execute(
+                    select(Users).where(Users.username == username).limit(1)
+                )
+            )
             .scalars()
             .first()
         )