新增仓位管理功能，支持按轮跟踪锁仓状态

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ft-app/app/models.py

@@ -86,4 +86,37 @@ class User(Base):
             dk = hashlib.pbkdf2_hmac("sha256", password.encode(), salt, 100000)
             return dk.hex() == dk_hex
         except (ValueError, AttributeError):
-            return False
+            return False
+
+
+class Round(Base):
+    __tablename__ = "rounds"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    contract_code: Mapped[str] = mapped_column(String(10), index=True)
+    daily_hands: Mapped[int] = mapped_column(Integer, default=1)
+    status: Mapped[str] = mapped_column(String(20), default="active")
+    started_at: Mapped[date] = mapped_column(Date)
+
+    positions: Mapped[list["Position"]] = relationship(
+        back_populates="round", cascade="all, delete-orphan"
+    )
+
+    @property
+    def total_locks(self) -> int:
+        return sum(p.locked_count for p in self.positions)
+
+
+class Position(Base):
+    __tablename__ = "positions"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    round_id: Mapped[int] = mapped_column(ForeignKey("rounds.id"), index=True)
+    open_price: Mapped[int] = mapped_column(Integer)
+    amp_threshold: Mapped[int] = mapped_column(Integer)
+    lock_price: Mapped[int] = mapped_column(Integer)
+    hands: Mapped[int] = mapped_column(Integer, default=1)
+    locked_count: Mapped[int] = mapped_column(Integer, default=0)
+    opened_at: Mapped[date] = mapped_column(Date)
+
+    round: Mapped["Round"] = relationship(back_populates="positions")