1.6

backend/app/models/friendship_tree.py

@@ -0,0 +1,25 @@
+"""好友之树模型"""
+
+from datetime import datetime
+
+from sqlalchemy import String, Integer, DateTime, ForeignKey, UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.database import Base
+
+
+class FriendshipTree(Base):
+    __tablename__ = "friendship_trees"
+    __table_args__ = (
+        UniqueConstraint("user_a_id", "user_b_id", name="uq_friendship_tree"),
+    )
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True)
+    user_a_id: Mapped[str] = mapped_column(String(36), ForeignKey("users.id", ondelete="CASCADE"))
+    user_b_id: Mapped[str] = mapped_column(String(36), ForeignKey("users.id", ondelete="CASCADE"))
+    water_count: Mapped[int] = mapped_column(Integer, default=0)
+    last_watered_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.utcnow())
+
+    user_a = relationship("User", foreign_keys=[user_a_id])
+    user_b = relationship("User", foreign_keys=[user_b_id])