Slow down the DB write interval and catch the case that it changed during write

backend/store.py

@@ -247,8 +247,18 @@ class ChangeDetectionStore:
 
     def sync_to_json(self):
         print("Saving..")
+        data ={}
+
+        try:
+            data = deepcopy(self.__data)
+        except RuntimeError:
+            time.sleep(0.5)
+            print ("! Data changed when writing to JSON, trying again..")
+            self.sync_to_json()
+            return
+        else:
             with open(self.json_store_path, 'w') as json_file:
-            json.dump(self.__data, json_file, indent=4)
+                json.dump(data, json_file, indent=4)
                 logging.info("Re-saved index")
 
             self.needs_write = False
@@ -263,6 +273,6 @@ class ChangeDetectionStore:
                 return
             if self.needs_write:
                 self.sync_to_json()
-            time.sleep(1)
 
-# body of the constructor
+            time.sleep(3)
+