[0.8.0] - 2023-09-25
====================

Notable Changes
---------------

- The `v_transactions` and `v_tx_outputs` views have changed in terms of what
  columns are returned, and which result columns may be null. Please see the
  `Changed` section below for additional details.

Added
-----

- `zcash_client_sqlite::commitment_tree` Types related to management of note
  commitment trees using the `shardtree` crate.
- A new default-enabled feature flag `multicore`. This allows users to disable
  multicore support by setting `default_features = false` on their
  `zcash_primitives`, `zcash_proofs`, and `zcash_client_sqlite` dependencies.
- `zcash_client_sqlite::ReceivedNoteId`
- `zcash_client_sqlite::wallet::commitment_tree` A new module containing a
  sqlite-backed implementation of `shardtree::store::ShardStore`.
- `impl zcash_client_backend::data_api::WalletCommitmentTrees for WalletDb`

Changed
-------

- MSRV is now 1.65.0.
- Bumped dependencies to `hdwallet 0.4`, `incrementalmerkletree 0.5`, `bs58 0.5`,
  `prost 0.12`, `rusqlite 0.29`, `schemer-rusqlite 0.2.2`, `time 0.3.22`,
  `tempfile 3.5`, `zcash_address 0.3`, `zcash_note_encryption 0.4`,
  `zcash_primitives 0.13`, `zcash_client_backend 0.10`.
- Added dependencies on `shardtree 0.0`, `zcash_encoding 0.2`, `byteorder 1`
- A `CommitmentTree` variant has been added to `zcash_client_sqlite::wallet::init::WalletMigrationError`
- `min_confirmations` parameter values are now more strongly enforced. Previously,
  a note could be spent with fewer than `min_confirmations` confirmations if the
  wallet did not contain enough observed blocks to satisfy the `min_confirmations`
  value specified; this situation is now treated as an error.
- `zcash_client_sqlite::error::SqliteClientError` has new error variants:
  - `SqliteClientError::AccountUnknown`
  - `SqliteClientError::BlockConflict`
  - `SqliteClientError::CacheMiss`
  - `SqliteClientError::ChainHeightUnknown`
  - `SqliteClientError::CommitmentTree`
  - `SqliteClientError::NonSequentialBlocks`
- `zcash_client_backend::FsBlockDbError` has a new error variant:
  - `FsBlockDbError::CacheMiss`
- `zcash_client_sqlite::FsBlockDb::write_block_metadata` now overwrites any
  existing metadata entries that have the same height as a new entry.
- The `v_transactions` and `v_tx_outputs` views no longer return the
  internal database identifier for the transaction. The `txid` column should
  be used instead. The `tx_index`, `expiry_height`, `raw`, `fee_paid`, and
  `expired_unmined` columns will be null for received transparent
  transactions, in addition to the other columns that were previously
  permitted to be null.

Removed
-------

- The empty `wallet::transact` module has been removed.
- `zcash_client_sqlite::NoteId` has been replaced with `zcash_client_sqlite::ReceivedNoteId`
  as the `SentNoteId` variant is now unused following changes to
  `zcash_client_backend::data_api::WalletRead`.
- `zcash_client_sqlite::wallet::init::{init_blocks_table, init_accounts_table}`
  have been removed. `zcash_client_backend::data_api::WalletWrite::create_account`
  should be used instead; the initialization of the note commitment tree
  previously performed by `init_blocks_table` is now handled by passing an
  `AccountBirthday` containing the note commitment tree frontier as of the
  end of the birthday height block to `create_account` instead.
- `zcash_client_sqlite::DataConnStmtCache` has been removed in favor of using
  `rusqlite` caching for prepared statements.
- `zcash_client_sqlite::prepared` has been entirely removed.

Fixed
-----

- Fixed an off-by-one error in the `BlockSource` implementation for the SQLite-backed
 `BlockDb` block database which could result in blocks being skipped at the start of
 scan ranges.
- `zcash_client_sqlite::{BlockDb, FsBlockDb}::with_blocks` now return an error
  if `from_height` is set to a block height that does not exist in the cache.
- `WalletDb::get_transaction` no longer returns an error when called on a transaction
  that has not yet been mined, unless the transaction's consensus branch ID cannot be
  determined by other means.
- Fixed an error in `v_transactions` wherein received transparent outputs did not
  result in a transaction entry appearing in the transaction history.