--- a/reference/store.py
+++ b/reference/store.py
@@ -16,9 +16,6 @@
     def persist(self, rows):
         with self.db:
             for row in rows:
-                old = self.db.execute("SELECT id,cents,currency FROM transactions WHERE id=?", (row[0],)).fetchone()
-                if old is not None and old != row:
-                    raise ValueError("duplicate id with conflicting payload")
                 self.db.execute("INSERT OR IGNORE INTO transactions VALUES(?,?,?)", row)
 
     def advance(self, cursor):