Add initial project

backend/models/daily_context.py

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+"""Daily Context Model - Stores subjective user inputs like mood, tags, etc."""
+from sqlalchemy import Column, Integer, String, Date, ForeignKey, UniqueConstraint
+from backend.database import Base
+
+class DailyContext(Base):
+    __tablename__ = "daily_context"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), index=True)
+    date = Column(Date, index=True)
+    
+    mood_score = Column(Integer)  # 1-100 slider
+    tags = Column(String, nullable=True)  # Comma separated tags e.g. "Alcohol,Stress"
+    notes = Column(String, nullable=True)
+    
+    __table_args__ = (
+        UniqueConstraint('user_id', 'date', name='uq_daily_context'),
+    )