diff --git a/facebook_graph_service.py b/facebook_graph_service.py
index 164c27a..a16d776 100644
--- a/facebook_graph_service.py
+++ b/facebook_graph_service.py
@@ -586,7 +586,7 @@ def sync_facebook_to_social_media(db, company_id: int) -> dict:
     csm.last_checked_at = now
 
     # Store all API fields in content_types JSONB (no migration needed)
-    extra = csm.content_types or {}
+    extra = dict(csm.content_types or {})
     # Page info fields
     for key in ('category', 'website', 'phone', 'founded', 'mission'):
         if page_info.get(key):
@@ -639,7 +639,7 @@ def sync_facebook_to_social_media(db, company_id: int) -> dict:
     csm.content_types = extra
 
     # Append to followers_history
-    history = csm.followers_history or []
+    history = list(csm.followers_history or [])
     if followers > 0:
         today_str = now.strftime('%Y-%m-%d')
         # Don't duplicate entries for the same day