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/models/user.py

@@ -1,9 +1,13 @@
 from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey
 from sqlalchemy.orm import relationship
-from datetime import datetime
+from datetime import datetime, timezone
 from database import Base
 
 
+def _utcnow():
+    return datetime.now(timezone.utc)
+
+
 class User(Base):
     __tablename__ = "users"
 
@@ -16,7 +20,7 @@ class User(Base):
     nickname = Column(String, nullable=True)
     mobile_phone = Column(String, nullable=True)
     avatar_url = Column(String, nullable=True)
-    created_at = Column(DateTime, default=datetime.utcnow)
+    created_at = Column(DateTime(timezone=True), default=_utcnow)
 
     orders_opened = relationship("Order", foreign_keys="Order.opened_by", back_populates="opener")
     orders_closed = relationship("Order", foreign_keys="Order.closed_by", back_populates="closer")
@@ -46,7 +50,7 @@ class WaiterZone(Base):
     id = Column(Integer, primary_key=True, index=True)
     waiter_id = Column(Integer, ForeignKey("users.id"), nullable=False)
     group_id = Column(Integer, ForeignKey("table_groups.id"), nullable=True)  # NULL = all zones
-    assigned_at = Column(DateTime, default=datetime.utcnow)
+    assigned_at = Column(DateTime(timezone=True), default=_utcnow)
 
     waiter = relationship("User", back_populates="zone_assignments")
     group = relationship("TableGroup", back_populates="waiter_zones")
@@ -58,7 +62,7 @@ class AssistantAssignment(Base):
     id = Column(Integer, primary_key=True, index=True)
     primary_waiter_id = Column(Integer, ForeignKey("users.id"), nullable=False)
     assistant_waiter_id = Column(Integer, ForeignKey("users.id"), nullable=False)
-    assigned_at = Column(DateTime, default=datetime.utcnow)
+    assigned_at = Column(DateTime(timezone=True), default=_utcnow)
 
     primary_waiter = relationship("User", foreign_keys=[primary_waiter_id], back_populates="primary_assignments")
     assistant_waiter = relationship("User", foreign_keys=[assistant_waiter_id], back_populates="assistant_assignments")