Ok, all of that stuff above is done, and tested at the database. A few hours of testing tonight at the server subscription/notification endpoints for address/scripthash/scriptpubkey and outpoint will wrap it up. I'll sync up a store with address index tonight and tomorrow we'll have a looksee at the performance benefit of the midstate hash optimization. The last remaining non-mempool item on Electrum is then hooking up the fee estimator.