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/business_day.py

@@ -0,0 +1,24 @@
+from pydantic import BaseModel
+from typing import Optional
+from schemas.base import UTCDatetime
+
+
+class BusinessDayOut(BaseModel):
+    id: int
+    status: str
+    opened_at: UTCDatetime
+    opened_by_id: int
+    closed_at: Optional[UTCDatetime] = None
+    closed_by_id: Optional[int] = None
+    notes: Optional[str] = None
+
+    model_config = {"from_attributes": True}
+
+
+class OpenBusinessDayRequest(BaseModel):
+    notes: Optional[str] = None
+
+
+class CloseBusinessDayRequest(BaseModel):
+    force: bool = False
+    notes: Optional[str] = None