fix: do not remove (#5706)

api/app.py

@@ -26,6 +26,7 @@ from werkzeug.exceptions import Unauthorized
 from commands import register_commands
 
 # DO NOT REMOVE BELOW
+from events import event_handlers
 from extensions import (
     ext_celery,
     ext_code_based_extension,
@@ -42,6 +43,7 @@ from extensions import (
 from extensions.ext_database import db
 from extensions.ext_login import login_manager
 from libs.passport import PassportService
+from models import account, dataset, model, source, task, tool, tools, web
 from services.account_service import AccountService
 
 # DO NOT REMOVE ABOVE