Common enemy rework

backend/app/models/assignment.py

@@ -1,6 +1,6 @@
 from datetime import datetime
 from enum import Enum
-from sqlalchemy import String, Text, DateTime, ForeignKey, Integer
+from sqlalchemy import String, Text, DateTime, ForeignKey, Integer, Boolean
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.core.database import Base
@@ -20,6 +20,8 @@ class Assignment(Base):
     challenge_id: Mapped[int] = mapped_column(ForeignKey("challenges.id", ondelete="CASCADE"))
     status: Mapped[str] = mapped_column(String(20), default=AssignmentStatus.ACTIVE.value)
     event_type: Mapped[str | None] = mapped_column(String(30), nullable=True)  # Event type when assignment was created
+    is_event_assignment: Mapped[bool] = mapped_column(Boolean, default=False, index=True)  # True for Common Enemy assignments
+    event_id: Mapped[int | None] = mapped_column(ForeignKey("events.id", ondelete="SET NULL"), nullable=True, index=True)  # Link to event
     proof_path: Mapped[str | None] = mapped_column(String(500), nullable=True)
     proof_url: Mapped[str | None] = mapped_column(Text, nullable=True)
     proof_comment: Mapped[str | None] = mapped_column(Text, nullable=True)
@@ -31,3 +33,4 @@ class Assignment(Base):
     # Relationships
     participant: Mapped["Participant"] = relationship("Participant", back_populates="assignments")
     challenge: Mapped["Challenge"] = relationship("Challenge", back_populates="assignments")
+    event: Mapped["Event | None"] = relationship("Event", back_populates="assignments")

backend/app/models/event.py

@@ -37,3 +37,4 @@ class Event(Base):
     # Relationships
     marathon: Mapped["Marathon"] = relationship("Marathon", back_populates="events")
     created_by: Mapped["User | None"] = relationship("User")
+    assignments: Mapped[list["Assignment"]] = relationship("Assignment", back_populates="event")