Restructure into full project layout

backend/app/models/user.py

@@ -0,0 +1,24 @@
+import enum
+from datetime import datetime
+from sqlalchemy import String, Boolean, Enum, DateTime
+from sqlalchemy.orm import Mapped, mapped_column
+from app.core.database import Base
+
+
+class UserRole(str, enum.Enum):
+    PENDING = "pending"
+    APPROVED = "approved"
+    ADMIN = "admin"
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    email: Mapped[str] = mapped_column(String(255), unique=True, nullable=False, index=True)
+    hashed_password: Mapped[str] = mapped_column(String(255), nullable=False)
+    display_name: Mapped[str | None] = mapped_column(String(100))
+    role: Mapped[UserRole] = mapped_column(Enum(UserRole), default=UserRole.PENDING, nullable=False)
+    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)
+    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)