refactor: migrate session.query to select API in console controllers (#34607)

api/controllers/mcp/mcp.py

@@ -4,6 +4,7 @@ from flask import Response
 from flask_restx import Resource
 from graphon.variables.input_entities import VariableEntity
 from pydantic import BaseModel, Field, ValidationError
+from sqlalchemy import select
 from sqlalchemy.orm import Session, sessionmaker
 
 from controllers.common.schema import register_schema_model
@@ -80,11 +81,11 @@ class MCPAppApi(Resource):
 
     def _get_mcp_server_and_app(self, server_code: str, session: Session) -> tuple[AppMCPServer, App]:
         """Get and validate MCP server and app in one query session"""
-        mcp_server = session.query(AppMCPServer).where(AppMCPServer.server_code == server_code).first()
+        mcp_server = session.scalar(select(AppMCPServer).where(AppMCPServer.server_code == server_code).limit(1))
         if not mcp_server:
             raise MCPRequestError(mcp_types.INVALID_REQUEST, "Server Not Found")
 
-        app = session.query(App).where(App.id == mcp_server.app_id).first()
+        app = session.scalar(select(App).where(App.id == mcp_server.app_id).limit(1))
         if not app:
             raise MCPRequestError(mcp_types.INVALID_REQUEST, "App Not Found")
 
@@ -190,12 +191,12 @@ class MCPAppApi(Resource):
     def _retrieve_end_user(self, tenant_id: str, mcp_server_id: str) -> EndUser | None:
         """Get end user - manages its own database session"""
         with sessionmaker(db.engine, expire_on_commit=False).begin() as session:
-            return (
-                session.query(EndUser)
+            return session.scalar(
+                select(EndUser)
                 .where(EndUser.tenant_id == tenant_id)
                 .where(EndUser.session_id == mcp_server_id)
                 .where(EndUser.type == "mcp")
-                .first()
+                .limit(1)
             )
 
     def _create_end_user(