Lite wallet#35
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Store UTXO creation height in LMDB so lite wallets can request delta updates. Add utxos_by_address to serve those wallet queries directly and speed up existing fn get_utxos_by_addresses (now using LMDB range queries). Route UTXO put/delete/spend/unspend paths through helpers that keep the primary outpoint index, address index, and STXO table in sync.
- Add AddressTxidKey keyed as address || txid - Store filled tx, its Merkle proof, block hash/height, and Unix timestamp - Update txdb with new confirmed txs when blocks connect to the active chain - Query txdb by address set and minimum block height - Prune txdb by Unix timestamp every 144 * 7 blocks (~weekly) - Prune txdb records for disconnected blocks during reorgs - Make Merkle proof types serializable General rationale: lite wallet is UTXO-based so strictly speaking it does not need to know tx history, however, it is still nice to show users actual tx history so they can figure out what was going on. However again, storing full tx history is too demanding for a full node so it is capped.
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Work in progress with an end goal to have a complete lite wallet protocol support outlined in #28