Major refactor WIP

backend/app/models/departure.py

@@ -17,6 +17,7 @@ class DepartureStatus(str, Enum):
     DEPARTED = "DEPARTED"
     LOCAL = "LOCAL"
     CANCELLED = "CANCELLED"
+    PENDING = "PENDING"
 
 
 class Departure(Base):
@@ -38,4 +39,5 @@ class Departure(Base):
     created_by = Column(String(16), nullable=True, index=True)
     submitted_via = Column(SQLEnum(SubmissionSource), nullable=False, default=SubmissionSource.ADMIN, index=True)
     pilot_email = Column(String(128), nullable=True)  # For public submissions
+    arrival_id = Column(BigInteger, nullable=True)  # Linked arrival for PPR-activated departures
     updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now(), nullable=False)