Phase 3.1: Enhanced Chore Logging and Reporting System

backend/app/models/chore_assignment.py

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+"""Chore Assignment model for many-to-many user-chore relationship."""
+from sqlalchemy import Column, Integer, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+from datetime import datetime
+from app.core.database import Base
+
+class ChoreAssignment(Base):
+    """Junction table for assigning multiple users to chores."""
+    __tablename__ = "chore_assignments"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    chore_id = Column(Integer, ForeignKey("chores.id", ondelete="CASCADE"), nullable=False)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    completed_at = Column(DateTime, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    
+    # Relationships
+    chore = relationship("Chore", back_populates="assignments")
+    user = relationship("User", back_populates="chore_assignments")