feat: iam rbac system

Endpoints and db architecture to support a role based IAM system.

src/organisation/dependencies.py

@@ -8,4 +8,21 @@ Classes:
 Functions:
  - List: Description
  - Functions: Description
-"""
+"""
+from typing import Annotated
+
+from fastapi import HTTPException, Depends
+
+from src.database import db_dependency
+
+from src.organisation.models import Organisation as Org
+
+
+def get_org_model(db: db_dependency, org_id: int) -> type[Org]:
+	org_model = db.query(Org).filter(Org.id == org_id).first()
+	if org_model is None:
+		raise HTTPException(status_code=404, detail="Organisation not found")
+
+	return org_model
+
+org_model_dependency = Annotated[type[Org], Depends(get_org_model)]