Implement divisions

backend/app/models/association.py

@@ -2,6 +2,7 @@ from typing import TYPE_CHECKING
 
 from sqlmodel import (
     Session,
+    Relationship,
 )
 
 from . import mixin
@@ -9,6 +10,9 @@ from .base import (
     BaseSQLModel,
 )
 
+if TYPE_CHECKING:
+    from .division import Division
+
 # region # Association #########################################################
 
 
@@ -37,6 +41,7 @@ class Association(mixin.RowId, AssociationBase, table=True):
     # --- read only items ------------------------------------------------------
 
     # --- back_populates links -------------------------------------------------
+    divisions: list["Division"] = Relationship(back_populates="association", cascade_delete=True)
 
     # --- CRUD actions ---------------------------------------------------------
     @classmethod