diff --git a/app/models/post_comment_models.py b/app/models/post_comment_models.py
index ed8da9c..82d8757 100644
--- a/app/models/post_comment_models.py
+++ b/app/models/post_comment_models.py
@@ -30,6 +30,8 @@ class Post_Comment_Base(BaseModel):
     person_id_random: Optional[str]
     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]
 
diff --git a/app/models/post_models.py b/app/models/post_models.py
index 1082e1c..07fd526 100644
--- a/app/models/post_models.py
+++ b/app/models/post_models.py
@@ -29,6 +29,8 @@ class Post_Base(BaseModel):
     person_id_random: Optional[str]
     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]