Added local flight duration

backend/app/models/local_flight.py

@@ -27,6 +27,7 @@ class LocalFlight(Base):
     pob = Column(Integer, nullable=False)  # Persons on board
     flight_type = Column(SQLEnum(LocalFlightType), nullable=False, index=True)
     status = Column(SQLEnum(LocalFlightStatus), nullable=False, default=LocalFlightStatus.BOOKED_OUT, index=True)
+    duration = Column(Integer, nullable=True)  # Duration in minutes
     notes = Column(Text, nullable=True)
     created_dt = Column(DateTime, nullable=False, server_default=func.current_timestamp(), index=True)
     etd = Column(DateTime, nullable=True, index=True)  # Estimated Time of Departure