added a router for logistics, now creating label

backend/app/schemas.py

@@ -1,4 +1,5 @@
 from typing import List, Optional
+from datetime import datetime, timedelta  # Add this import
 from pydantic import BaseModel, EmailStr, constr, Field
 from datetime import date
 
@@ -270,4 +271,23 @@ class ShipmentCreate(BaseModel):
 
 
 class UpdateShipmentComments(BaseModel):
-    comments: str
+    comments: str
+
+class LogisticsEventCreate(BaseModel):
+    dewar_qr_code: str
+    location_qr_code: str
+    transaction_type: str
+
+class SlotCreate(BaseModel):
+    id: int
+    needs_refill: bool
+    last_refill: datetime
+    occupied: bool
+
+class Slot(BaseModel):
+    slot_id: int
+    needs_refill: bool
+    time_until_refill: str
+
+    class Config:
+        from_attributes = True