fix(platform-wallet-storage): durably apply swept transactions in the SQLite store - #4559
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📝 WalkthroughWalkthroughThe storage layer now processes sweep removals, tracks chainlock and sync watermarks, preserves sweep-related UTXO state, and removes finalized tombstones. The migration adds the required columns and partial index. Documentation and capability declarations describe the updated behavior. ChangesUTXO sweep finality
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to When a swept output is later reinstated and materialized, the store can retain its spent claim indefinitely, leaving the coin unavailable after restart or block processing. Merge should wait for this correctness issue to be fixed or explicitly accepted by the owner. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant CoreStateApply
participant apply_sweep
participant core_sync_state
participant core_utxos
CoreStateApply->>core_sync_state: persist sync and chainlock watermarks
CoreStateApply->>apply_sweep: process swept loser transactions
apply_sweep->>core_utxos: release, repoint, or create placeholder claims
CoreStateApply->>core_utxos: collect finalized tombstones
core_utxos-->>CoreStateApply: remove released or finalized rows
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 54.55% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 4 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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… SQLite store Teaches the store the one subtractive part of a changeset. `apply_sweep` runs last in `apply`, batch by batch in emission order, so a later batch's decision to keep a coin spent survives an earlier batch's decision to free it — the order the wallet itself applied them in. Per swept transaction: the record row and every output it created go, its InstantSend lock row goes with it (nothing else ties that table to `core_transactions`), and a co-swept parent's outputs are removed even when the parent has no row of its own. Per released outpoint: the coin is freed unless a surviving stored record still claims it — asked as "does any unpruned row still claim this outpoint", upstream's own `retain_unclaimed` predicate, rather than the unanswerable "which transaction set this spent mark". The veto counts only network-final claimants: a bare mempool row can go stale forever, and letting one veto an authoritative release is the mirror image of the bug this fixes. Every input the release does NOT name keeps a durable claim, as a zero-value placeholder row when its funding output has never been seen, so a coin cannot come back unspent after a restart merely because the store never saw where it came from. `winner_mined_height` decides a placeholder's lifetime and never its existence. A block-context sweep stamps the winner's own height and the row is collectible once `min(chainlock, synced)` reaches it — upstream's `prune_finalized_observed_spends` boundary verbatim. An IS-locked winner that is not yet mined leaves the row UNSTAMPED and uncollectible: the lock alone settles the input under DIP-10, and no watermark can ever prove an unmined winner's funding delivered-or-never. V007 adds the stamp column; `spent_in_txid` needed no migration (V001 has it) and the new upsert valve is a no-op on every existing database, since `apply_sweep` is its only writer. The store declares `CORE_SWEEP_REMOVAL` and `DASHPAY_PAYMENTS`. Both are inert here — nothing emits a sweep until the producer lands, and the payments bit attests the overlay writer this crate already shipped. A sweep whose typed key disagrees with its stored record fails the round closed before anything is deleted: that row sits in the one gap where neither reader sees the other's evidence, and processing it would manufacture the double spend the veto exists to stop. Tests: 34 in `tests/sqlite_transaction_sweeps.rs`, all driving `core_state::apply` on hand-built changesets with no producer involved — release-versus-claim, co-swept twins, chained and repointed tombstones, collection boundaries, multi-wallet independence, corrupt-row refusals, and durability across a reopen. Known exposure, documented at the placeholder site and deferred by agreement: a swept loser's foreign inputs cannot be told from wallet-owned ones, so an unmined winner's placeholders are not collectible. rust-dashcore#968 tracks the upstream half.
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In `@packages/rs-platform-wallet-storage/SCHEMA.md`:
- Around line 384-393: Update SCHEMA.md to document all schema objects
introduced by V007__utxo_sweep_winner_height.rs: add
core_utxos.winner_mined_height to the CORE_UTXOS diagram and description, add
core_sync_state.chainlock_height to the CORE_SYNC_STATE diagram, and list
idx_core_utxos_unmaterialized(wallet_id, winner_mined_height) with its height IS
NULL predicate in the index section.
In `@packages/rs-platform-wallet-storage/src/sqlite/schema/core_state.rs`:
- Around line 675-676: The UPSERT_UTXO_SQL conflict-update logic must clear
materialised sweep claims when a reinstated UTXO is re-emitted through
new_utxos. Update the spent-state handling so released outpoints are no longer
preserved as spent solely because spent_in_txid is set, and ensure the
corresponding release path updates the materialised claim state so the coin
becomes available again.
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… release Two review follow-ups. `SCHEMA.md` described `spent_in_txid` but not the three objects V007 creates, so the reference no longer matched the database: `core_utxos.winner_mined_height`, `core_sync_state.chainlock_height`, and the partial `idx_core_utxos_unmaterialized` covering exactly the unmaterialised rows. All three are now in the diagrams and the prose, including what the stamp decides (a placeholder's lifetime, never its existence) and why the funding upsert clears it. The second was raised as a missing release path for a materialised claim. The path exists — `apply` splits on `height IS NULL`, deleting an unmaterialised placeholder outright and freeing a materialised row in place — but nothing pinned that half: every other release test exercises the placeholder, so a release that silently skipped materialised rows would have left a live coin spent forever with nothing else able to free it, the collector being deliberately unable to take such a row. `a_release_frees_a_materialised_claim_in_place` closes that: seed a stamped tombstone, materialise it through the funding upsert, then have the winner itself swept with the coin released, and assert the row comes back unspent in place — keeping its funding data — and stays so across a restart.
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Issue being fixed or feature implemented
The SQLite store has no way to act on the one subtractive part of a changeset. Without it, a transaction the wallet dropped in memory stays on disk, replays at the next
load(), and hands back coins the network already consumed.Still fully inert: nothing emits a sweep until the producer lands (#4406's next PR), and
applyfast-returns on an emptysweeps.What was done?
apply_sweepruns last inapply, batch by batch in emission order, so a later batch's decision to keep a coin spent survives an earlier batch's decision to free it — the order the wallet itself applied them in.Per swept transaction: the record row and every output it created go; its InstantSend lock row goes with it (nothing else ties
core_instant_lockstocore_transactions); a co-swept parent's outputs are removed even when the parent has no row of its own.Per released outpoint: the coin is freed unless a surviving stored record still claims it. The question asked is "does any unpruned row still claim this outpoint" — upstream's own
retain_unclaimedpredicate — rather than the unanswerable "which transaction set this spent mark", which SQLite does not record. The veto counts only network-final claimants: a bare mempool row can go stale forever, and letting one veto an authoritative release is the mirror image of the bug this fixes.Every input the release does not name keeps a durable claim, as a zero-value placeholder row when its funding output has never been seen — so a coin cannot come back unspent after a restart merely because the store never saw where it came from.
winner_mined_heightdecides a placeholder's lifetime, never its existence. A block-context sweep stamps the winner's own height and the row is collectible oncemin(chainlock, synced)reaches it — upstream'sprune_finalized_observed_spendsboundary verbatim. An IS-locked winner that is not yet mined leaves the row UNSTAMPED and uncollectible: under DIP-10 the lock alone settles the input, and no watermark can ever prove an unmined winner's funding delivered-or-never.V007adds the stamp column.spent_in_txidneeded no migration (V001 has it) and the new upsert valve is a no-op on every existing database, sinceapply_sweepis its only writer.The store declares
CORE_SWEEP_REMOVALandDASHPAY_PAYMENTS. Both are inert here — the sweep bit gates nothing until the producer lands, and the payments bit attests the overlay writer this crate already ships.A sweep whose typed key disagrees with its stored record fails the round closed before anything is deleted: that row sits in the one gap where neither reader sees the other's evidence, and processing it would manufacture the double spend the veto exists to stop.
How Has This Been Tested?
cargo test -p platform-wallet-storage— 254 tests pass across the crate.tests/sqlite_transaction_sweeps.rsadds 34, all drivingcore_state::applyon hand-built changesets with no producer involved: release-versus-claim, co-swept twins, chained and repointed tombstones, collection boundaries (stamped, unstamped, and without a persisted chainlock), multi-wallet independence, corrupt-row refusals, and durability across a reopen.Breaking Changes
None. V007 is additive and every existing database migrates unchanged.
Known exposure, deferred by prior agreement: a swept loser's foreign inputs cannot be told from wallet-owned ones, so an unmined winner's placeholders are not collectible. Documented at the placeholder site;
rust-dashcore#968tracks the upstream half. Bounded storage residue, no funds-correctness consequence.Checklist:
For repository code-owners and collaborators only
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New Features
Bug Fixes
Documentation