fix: unique_tenant_account_join

api/services/account_service.py

@@ -421,9 +421,14 @@ class TenantService:
             if TenantService.has_roles(tenant, [TenantAccountJoinRole.OWNER]):
                 logging.error(f"Tenant {tenant.id} has already an owner.")
                 raise Exception("Tenant already has an owner.")
+        
+        ta = db.session.query(TenantAccountJoin).filter_by(tenant_id=tenant.id, account_id=account.id).first()
+        if ta:
+            ta.role = role
+        else:
+            ta = TenantAccountJoin(tenant_id=tenant.id, account_id=account.id, role=role)
+            db.session.add(ta)
 
-        ta = TenantAccountJoin(tenant_id=tenant.id, account_id=account.id, role=role)
-        db.session.add(ta)
         db.session.commit()
         return ta