Initial commit: HabitForge - habit tracking application with FastAPI backend, React frontend, and Zepp integration

backend/models/user.py

@@ -0,0 +1,17 @@
+"""User SQLAlchemy model."""
+from sqlalchemy import Column, Integer, String
+from sqlalchemy.orm import relationship
+from backend.database import Base
+
+
+class User(Base):
+    """User model for authentication and ownership."""
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    username = Column(String, unique=True, index=True)
+    hashed_password = Column(String)
+
+    challenges = relationship("Challenge", back_populates="owner")
+    health_metrics = relationship("DailyHealthMetrics", back_populates="user")
+    workouts = relationship("WorkoutSession", back_populates="user")