From 7532841d9d00d509e2998c8cffac6bec3933e461 Mon Sep 17 00:00:00 2001
From: patrick-motsch <p.motsch@valueon.ch>
Date: Mon, 9 Feb 2026 12:57:47 +0100
Subject: [PATCH] fixed mandate flag

---
 modules/datamodels/datamodelUam.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/modules/datamodels/datamodelUam.py b/modules/datamodels/datamodelUam.py
index d8e7906a..6b7cdc06 100644
--- a/modules/datamodels/datamodelUam.py
+++ b/modules/datamodels/datamodelUam.py
@@ -89,6 +89,14 @@ class Mandate(BaseModel):
         json_schema_extra={"frontend_type": "checkbox", "frontend_readonly": True, "frontend_required": False}
     )
 
+    @field_validator('isSystem', mode='before')
+    @classmethod
+    def _coerceIsSystem(cls, v):
+        """Coerce None to False (for existing DB records without isSystem field)."""
+        if v is None:
+            return False
+        return v
+
 
 registerModelLabels(
     "Mandate",