Initial release

backend/app/models/participant.py

@@ -0,0 +1,28 @@
+import uuid
+from datetime import datetime
+from typing import TYPE_CHECKING
+
+from sqlalchemy import BigInteger, DateTime, ForeignKey, UniqueConstraint
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from .base import Base
+
+if TYPE_CHECKING:
+    from .lottery import Lottery
+    from .user import User
+
+
+class Participant(Base):
+    __tablename__ = "participants"
+    __table_args__ = (UniqueConstraint("lottery_id", "user_id"),)
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    lottery_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("lotteries.id", ondelete="CASCADE")
+    )
+    user_id: Mapped[int] = mapped_column(BigInteger, ForeignKey("users.id"))
+    joined_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+
+    lottery: Mapped["Lottery"] = relationship("Lottery", back_populates="participants")
+    user: Mapped["User"] = relationship("User")