diff --git a/litellm/proxy/db/db_spend_update_writer.py b/litellm/proxy/db/db_spend_update_writer.py
index 77d16e90706..8bcfe28488e 100644
--- a/litellm/proxy/db/db_spend_update_writer.py
+++ b/litellm/proxy/db/db_spend_update_writer.py
@@ -188,17 +188,16 @@ SET spend = "LiteLLM_TeamMembership".spend + EXCLUDED.spend,
 
 
 async def _write_team_member_spend(transaction: _SpendTransaction, spend_by_member_key: Mapping[str, float]) -> None:
-    # key is "team_id::<value>::user_id::<value>"; rows are sorted by (team_id, user_id) so the teams are
-    # locked in the same `sorted(team_ids)` order the team endpoints use, preventing deadlocks
+    # key is "team_id::<value>::user_id::<value>"; locks are taken in sorted team_id order like the team endpoints
     rows: Final = sorted((key.split("::")[1], key.split("::")[3], cost) for key, cost in spend_by_member_key.items())
-    team_ids: Final = [team_id for team_id, _user_id, _cost in rows]
+    team_ids: Final = tuple(team_id for team_id, _user_id, _cost in rows)
     for team_id in dict.fromkeys(team_ids):
         _ = await transaction.execute_raw(_TEAM_ADVISORY_LOCK_SQL, team_id)
     _ = await transaction.execute_raw(
         _TEAM_MEMBER_SPEND_SQL,
-        [user_id for _team_id, user_id, _cost in rows],
+        tuple(user_id for _team_id, user_id, _cost in rows),
         team_ids,
-        [cost for _team_id, _user_id, cost in rows],
+        tuple(cost for _team_id, _user_id, cost in rows),
     )
 
 
diff --git a/litellm/proxy/management_helpers/utils.py b/litellm/proxy/management_helpers/utils.py
index d84d32431ec..c10e5f9b23d 100644
--- a/litellm/proxy/management_helpers/utils.py
+++ b/litellm/proxy/management_helpers/utils.py
@@ -476,7 +476,9 @@ async def add_new_member(
     if returned_user is not None and returned_user.user_id is not None:
         membership_table: Final[_PrismaTeamMembershipTable] = _team_membership_table(prisma_client, tx)
         membership_key: Final[Mapping[str, object]] = {"user_id": returned_user.user_id, "team_id": team_id}
-        budget_link: Final[Mapping[str, object]] = {"budget_id": _budget_id} if _budget_id is not None else {}
+        budget_link: Final[Mapping[str, str]] = (
+            MappingProxyType({"budget_id": _budget_id}) if _budget_id is not None else MappingProxyType({})
+        )
         _returned_team_membership: Final = await membership_table.upsert(
             where={"user_id_team_id": membership_key},
             data={"create": {**membership_key, **budget_link}, "update": {}},
diff --git a/tests/test_litellm/proxy/db/test_db_spend_update_writer.py b/tests/test_litellm/proxy/db/test_db_spend_update_writer.py
index 70199ee0c73..e38a65f2b12 100644
--- a/tests/test_litellm/proxy/db/test_db_spend_update_writer.py
+++ b/tests/test_litellm/proxy/db/test_db_spend_update_writer.py
@@ -979,7 +979,7 @@ async def test_commit_spend_updates_to_db_writes_team_member_spend_in_one_roster
     assert "pg_advisory_xact_lock(hashtext($1))" in lock_statement
     statement, user_ids, team_ids, costs = spend_call.args
     assert statement is _TEAM_MEMBER_SPEND_SQL
-    assert (user_ids, team_ids, costs) == ([user_id], [team_id], [response_cost])
+    assert (list(user_ids), list(team_ids), list(costs)) == ([user_id], [team_id], [response_cost])
     assert 'INSERT INTO "LiteLLM_TeamMembership"' in statement
     assert "members_with_roles @> jsonb_build_array(jsonb_build_object('user_id', p.user_id))" in statement
     assert "ON CONFLICT (user_id, team_id) DO UPDATE" in statement