> I refer to a succession of 3 post versions which differ in no way other than timestamp The last change was a remove double `ii` (posiible) in the start post title. I don't update a post without changes. > Apply changes in tandem, perhaps iterating over the pool. Yeah, it's idea. Detect any `pragma`/`attach`/`dettach` command is simple. Thanks. > I would not worry much about ... I don't worry about performance. I want to allow an user to execute (and interrupt if he needs) long time queries.