Just use the current/previous md5

backend/__init__.py

@@ -450,8 +450,7 @@ class Worker(threading.Thread):
                         app.logger.error("File permission error updating", uuid, str(s))
                     else:
                         if result:
-                            
-                            result["previous_md5"] = result["current_md5"]
+                                                        
                             datastore.update_watch(uuid=uuid, update_obj=result)
 
                             if contents:

backend/fetch_site_status.py

@@ -89,6 +89,6 @@ class perform_site_check():
                     update_obj["last_changed"] = timestamp
 
 
-                update_obj["current_md5"] = fetched_md5
+                update_obj["previous_md5"] = fetched_md5
 
         return update_obj, stripped_text_from_html

backend/store.py

@@ -198,7 +198,7 @@ class ChangeDetectionStore:
     def save_history_text(self, uuid, result_obj, contents):
 
         output_path = "{}/{}".format(self.datastore_path, uuid)
-        fname = "{}/{}-{}.stripped.txt".format(output_path, result_obj['current_md5'], str(time.time()))
+        fname = "{}/{}-{}.stripped.txt".format(output_path, result_obj['previous_md5'], str(time.time()))
         with open(fname, 'w') as f:
             f.write(contents)
             f.close()