chore: retire demo technical debt

backend/app/api/push_configs.py

@@ -3,7 +3,7 @@
 from datetime import time
 
 from fastapi import APIRouter, Depends, HTTPException, Response, status
-from pydantic import BaseModel
+from pydantic import BaseModel, ConfigDict
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -26,15 +26,14 @@ class PushConfigUpsert(BaseModel):
 class PushConfigResponse(BaseModel):
     """Push config response."""
 
+    model_config = ConfigDict(from_attributes=True)
+
     id: str
     child_profile_id: str
     push_time: time | None
     push_days: list[int]
     enabled: bool
 
-    class Config:
-        from_attributes = True
-
 
 class PushConfigListResponse(BaseModel):
     """Push config list response."""