rework shop

backend/app/models/participant.py

@@ -1,6 +1,6 @@
 from datetime import datetime
 from enum import Enum
-from sqlalchemy import DateTime, ForeignKey, Integer, String, UniqueConstraint, Boolean
+from sqlalchemy import DateTime, ForeignKey, Integer, String, UniqueConstraint, Boolean, Float
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.core.database import Base
@@ -32,7 +32,15 @@ class Participant(Base):
     # Shop: consumables state
     skips_used: Mapped[int] = mapped_column(Integer, default=0)
     has_active_boost: Mapped[bool] = mapped_column(Boolean, default=False)
-    has_shield: Mapped[bool] = mapped_column(Boolean, default=False)
+
+    # Lucky Dice state
+    has_lucky_dice: Mapped[bool] = mapped_column(Boolean, default=False)
+    lucky_dice_multiplier: Mapped[float | None] = mapped_column(Float, nullable=True)
+
+    # Undo state - stores last drop data for potential rollback
+    last_drop_points: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    last_drop_streak_before: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    can_undo: Mapped[bool] = mapped_column(Boolean, default=False)
 
     # Relationships
     user: Mapped["User"] = relationship("User", back_populates="participations")