login passwd

backend/app/models.py

@@ -17,6 +17,19 @@ class Student(Base):
     mastery = relationship("StudentSkillMastery", back_populates="student", cascade="all, delete-orphan")
 
 
+class User(Base):
+    __tablename__ = "users"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    username: Mapped[str] = mapped_column(String(120), unique=True, index=True)
+    password_hash: Mapped[str] = mapped_column(String(255))
+    role: Mapped[str] = mapped_column(String(30), index=True)
+    student_id: Mapped[int | None] = mapped_column(ForeignKey("students.id"), nullable=True, index=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+
+    student = relationship("Student")
+
+
 class Message(Base):
     __tablename__ = "messages"