Phase 1: scaffold local backend — models, schemas, routers, printer service, Docker

local_backend/models/user.py

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+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+from datetime import datetime
+from database import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    username = Column(String, unique=True, nullable=False, index=True)
+    pin_hash = Column(String, nullable=False)
+    role = Column(String, nullable=False)  # 'waiter' | 'manager' | 'sysadmin'
+    is_active = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime, default=datetime.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")
+    order_items = relationship("OrderItem", back_populates="added_by_user")
+    order_assignments = relationship("OrderWaiter", back_populates="waiter")
+
+    primary_assignments = relationship(
+        "AssistantAssignment",
+        foreign_keys="AssistantAssignment.primary_waiter_id",
+        back_populates="primary_waiter",
+    )
+    assistant_assignments = relationship(
+        "AssistantAssignment",
+        foreign_keys="AssistantAssignment.assistant_waiter_id",
+        back_populates="assistant_waiter",
+    )
+
+
+class AssistantAssignment(Base):
+    __tablename__ = "assistant_assignments"
+
+    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)
+
+    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")