Add 'backend/' from commit '48a644fb354d6c6efcbd12bc1b4a2cb83137b68e'

git-subtree-dir: backend
git-subtree-mainline: 545699d16f
git-subtree-split: 48a644fb35

backend/models/__init__.py

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+from .user import User
+
+__all__ = ["User"]

backend/models/user.py

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+from datetime import datetime, timezone
+from enum import Enum
+from sqlalchemy import Column, Integer, String, Text, DateTime, Enum as SQLEnum
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()
+
+class UserRole(str, Enum):
+    SYSTEM_ADMIN = "system_admin"
+    ADMIN = "admin"
+    USER = "user"
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    username = Column(String(50), unique=True, nullable=False)
+    password = Column(String(255), nullable=False)
+    role = Column(SQLEnum(UserRole), nullable=False, default=UserRole.USER)
+    description = Column(Text)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
+
+    def __repr__(self):
+        return f"<User(id={self.id}, username={self.username}, role={self.role})>"