Update backend/python/app/models/location_group.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: ColinToft

backend/python/app/models/location_group.py

@@ -24,7 +24,7 @@ class LocationGroup(LocationGroupBase, BaseModel, table=True):
     __tablename__ = "location_groups"
     location_group_id: UUID = Field(default_factory=uuid4, primary_key=True)
     # Relationship to locations
-    locations: list["Location"] = Relationship()
+    locations: list["Location"] = Relationship(back_populates="location_group")
 
     @property
     def num_locations(self) -> int: