first commit

app/models/watchlist.py

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+from datetime import datetime
+
+from sqlalchemy import DateTime, ForeignKey, String, UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.database import Base
+
+
+class WatchlistEntry(Base):
+    __tablename__ = "watchlist_entries"
+    __table_args__ = (
+        UniqueConstraint("user_id", "ticker_id", name="uq_watchlist_user_ticker"),
+    )
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    user_id: Mapped[int] = mapped_column(
+        ForeignKey("users.id", ondelete="CASCADE"), nullable=False
+    )
+    ticker_id: Mapped[int] = mapped_column(
+        ForeignKey("tickers.id", ondelete="CASCADE"), nullable=False
+    )
+    entry_type: Mapped[str] = mapped_column(String(10), nullable=False)
+    added_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=datetime.utcnow, nullable=False
+    )
+
+    user = relationship("User", back_populates="watchlist_entries")
+    ticker = relationship("Ticker", back_populates="watchlist_entries")