diff --git a/app/models/event_models.py b/app/models/event_models.py
index 8adec29..c6dc38e 100644
--- a/app/models/event_models.py
+++ b/app/models/event_models.py
@@ -43,6 +43,8 @@ class Event_Base(BaseModel):
     poc_person_id_random: Optional[str]
     poc_person_id: Optional[int]
 
+    external_person_id: Optional[str] # Person ID generated by external system (should be stable and not change)
+
     user_id_random: Optional[str]
     user_id: Optional[int]