fix: Use correct typehint for return values (langgenius#1454)

Co-authored-by: lethe <lethe>

api/services/account_service.py

@@ -6,7 +6,7 @@
 import uuid
 from datetime import datetime, timedelta
 from hashlib import sha256
-from typing import Optional
+from typing import Optional, Dict, Any
 
 from werkzeug.exceptions import Forbidden, Unauthorized
 from flask import session, current_app
@@ -24,7 +24,8 @@
 from models.account import *
 from tasks.mail_invite_member_task import send_invite_member_mail_task
 
-def _create_tenant_for_account(account):
+
+def _create_tenant_for_account(account) -> Tenant:
     tenant = TenantService.create_tenant(f"{account.name}'s Workspace")
 
     TenantService.create_tenant_member(tenant, account, role='owner')
@@ -505,7 +506,7 @@ def revoke_token(cls, workspace_id: str, email: str, token: str):
             redis_client.delete(cls._get_invitation_token_key(token))
 
     @classmethod
-    def get_invitation_if_token_valid(cls, workspace_id: str, email: str, token: str) -> Optional[Account]:
+    def get_invitation_if_token_valid(cls, workspace_id: str, email: str, token: str) -> Optional[Dict[str, Any]]:
         invitation_data = cls._get_invitation_by_token(token, workspace_id, email)
         if not invitation_data:
             return None
@@ -539,7 +540,7 @@ def get_invitation_if_token_valid(cls, workspace_id: str, email: str, token: str
                 }
 
     @classmethod
-    def _get_invitation_by_token(cls, token: str, workspace_id: str, email: str) -> Optional[str]:
+    def _get_invitation_by_token(cls, token: str, workspace_id: str, email: str) -> Optional[Dict[str, str]]:
         if workspace_id is not None and email is not None:
             email_hash = sha256(email.encode()).hexdigest()
             cache_key = f'member_invite_token:{workspace_id}, {email_hash}:{token}'