Fix id column name in Update query.

Author: andrew-chang-dewitt

db_wrapper/model.py

@@ -152,7 +152,7 @@ def compose_changes(changes: Dict[str, Any]) -> sql.Composed:
         query = sql.SQL(
             'UPDATE {table} '
             'SET {changes} '
-            'WHERE id = {id_value} '
+            'WHERE _id = {id_value} '
             'RETURNING *;'
         ).format(
             table=self._table,