now with a working countdowntimer for each dewar

backend/app/models.py

@@ -156,6 +156,5 @@ class LogisticsEvent(Base):
     slot_id = Column(Integer, ForeignKey('slots.id'))   # corrected table name
     event_type = Column(String, index=True)
     timestamp = Column(DateTime, default=datetime.utcnow)
-    action_details = Column(String)
     dewar = relationship("Dewar", back_populates="events")
     slot = relationship("Slot", back_populates="events")

backend/app/routers/logistics.py

@@ -103,7 +103,6 @@ async def refill_dewar(qr_code: str, db: Session = Depends(get_db)):
         slot_id=None,
         event_type="refill",
         timestamp=now,
-        action_details=f"{dewar.unique_id} refilled"
     )
     db.add(new_event)
     db.commit()