Backend overhaul: new models, routers, schemas for shifts, business day, flags, messages, settings

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

local_backend/schemas/user.py

@@ -1,6 +1,7 @@
 from pydantic import BaseModel
 from datetime import datetime
 from typing import Optional, List
+from schemas.base import UTCDatetime
 
 
 class UserBase(BaseModel):
@@ -36,7 +37,7 @@ class WaiterZoneOut(BaseModel):
 
 class UserOut(UserBase):
     id: int
-    created_at: datetime
+    created_at: UTCDatetime
     zone_assignments: List[WaiterZoneOut] = []
 
     model_config = {"from_attributes": True}
@@ -54,6 +55,6 @@ class AssistantAssignmentOut(BaseModel):
     id: int
     primary_waiter_id: int
     assistant_waiter_id: int
-    assigned_at: datetime
+    assigned_at: UTCDatetime
 
     model_config = {"from_attributes": True}